CN113258231A - Dielectric filter - Google Patents
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- CN113258231A CN113258231A CN202010814838.XA CN202010814838A CN113258231A CN 113258231 A CN113258231 A CN 113258231A CN 202010814838 A CN202010814838 A CN 202010814838A CN 113258231 A CN113258231 A CN 113258231A
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- H—ELECTRICITY
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The invention discloses a dielectric filter, which comprises: a dielectric body including a resonance region and a port source coupling region located at one side of the resonance region; the resonant area of the first surface of the medium main body is provided with at least one medium resonant cavity, each medium resonant cavity is provided with a first blind hole, and the first blind holes are used for adjusting the frequency of the medium resonant cavities; the port source coupling area of the first surface of the medium body is provided with at least one source coupling resonant cavity and at least one port source, the source coupling resonant cavity is provided with an active coupling window, and the source coupling window is used for adjusting the coupling strength of the at least one port source and the at least one source coupling resonant cavity. The technical scheme of the invention aims to realize the dielectric filter with high mechanical strength and good out-of-band rejection capability.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a dielectric filter.
Background
The rapid development of communication technology is driving the development of communication base station equipment towards miniaturization, integration and light weight. Dielectric filters are widely used in base station equipment due to their good performance, small size and light weight. The filter is used for enabling electromagnetic wave signals in a specific frequency range to pass and generating suppression on electromagnetic wave signals of the frequency corresponding to the out-of-band transmission zero point.
The dielectric filter has the advantages of high quality factor, small insertion loss, high power, convenient miniaturization and the like, and is widely applied to the filter. However, the existing dielectric filter can reduce the mechanical strength thereof with the increase of out-of-band transmission zero, and is easy to damage in the using process.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a dielectric filter, and aims to realize a dielectric filter with high mechanical strength and good out-of-band rejection capability.
To achieve the above object, an embodiment of the present invention provides a dielectric filter, including:
a dielectric body comprising a resonant region and a port source coupling region located to one side of the resonant region;
at least one medium resonant cavity is arranged in a resonant area of the first surface of the medium main body, each medium resonant cavity is provided with a first blind hole, and the first blind holes are used for adjusting the frequency of the medium resonant cavities;
the port source coupling area of the first surface of the medium body is provided with at least one source coupling resonant cavity and at least one port source, the source coupling resonant cavity is provided with an active coupling window, and the source coupling window is used for adjusting the coupling strength of at least one port source and at least one source coupling resonant cavity.
Compared with the prior art, the dielectric filter provided by the invention has the advantages that the port source coupling area is additionally arranged on the dielectric main body, namely, the mechanical strength of the dielectric filter is increased. In addition, a port source can be coupled with at least one source coupling resonant cavity through a source coupling window, and on the basis of an existing topological structure formed by at least one medium resonant cavity included in a resonant region of the first surface of the medium main body, the topological structure of the medium filter is enriched, so that the number of out-of-band transmission zeros can be increased, and the out-of-band rejection capability of the medium filter is improved.
Drawings
Fig. 1 is a plan view of a dielectric filter according to an embodiment of the present invention;
fig. 2 is an isometric view of a dielectric filter provided by an embodiment of the present invention;
fig. 3 is a top view of another dielectric filter provided in an embodiment of the present invention;
fig. 4 is an isometric view of another dielectric filter provided by an embodiment of the present invention;
FIG. 5 is a graph of S-parameter versus frequency response for a dielectric filter provided in accordance with an embodiment of the present invention;
FIG. 6 is a graph of S-parameter versus frequency response for another dielectric filter provided in accordance with an embodiment of the present invention;
FIG. 7 is a graph of S-parameter versus frequency response for yet another dielectric filter provided in an embodiment of the present invention;
fig. 8 is a top view of yet another dielectric filter provided by an embodiment of the present invention;
FIG. 9 is a cross-sectional view of the port source of FIG. 3 taken in the direction D1-D2.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no peculiar meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
As described in the background art, the existing dielectric filter, with the increase of the out-of-band transmission zero point, will reduce its mechanical strength and is easily damaged in the using process. The reason is that the dielectric filter in the prior art only includes a resonance region, and usually, a groove is arranged in the resonance region as a negative coupling structure to realize the coupling of adjacent dielectric resonant cavities, so as to enrich the topological structure of the dielectric filter and further increase the out-of-band transmission zero point of the dielectric filter, wherein the arrangement of the groove needs to be realized by removing part of the dielectric main body material. Therefore, the groove is used as a negative coupling structure to realize the coupling of adjacent dielectric resonant cavities, so that the out-of-band transmission zero point of the dielectric filter is increased, the mechanical strength of the dielectric filter is reduced, and the dielectric filter is easy to damage in the using process.
In view of the above technical problems, embodiments of the present invention provide a dielectric filter, which increases the number of out-of-band transmission zeros of the dielectric filter on the basis of ensuring the mechanical strength of the dielectric filter, and improves the out-of-band rejection capability of the dielectric filter.
Fig. 1 is a top view of a dielectric filter according to an embodiment of the present invention. Fig. 2 is an axial view of a dielectric filter according to an embodiment of the present invention. Referring to fig. 1 and 2, the filter includes: a dielectric body 10, the dielectric body 10 including a resonance region 10A and a port source coupling region 10B located at one side of the resonance region 10A; the resonance area 10A of the first surface 100 of the dielectric body 10 is provided with at least one dielectric resonant cavity 11, and each dielectric resonant cavity 11 is provided with a first blind hole 11A; the port source coupling region 10B of the first surface 100 of the dielectric body 10 is provided with at least one source coupled resonator 12 and at least one port source 13, the source coupled resonator 12 is provided with an active coupling window 120, and the source coupling window 120 is used for adjusting the coupling strength of the at least one port source 13 and the at least one source coupled resonator 12.
It should be noted that the source coupling window 120 refers to the portion of the dielectric body between the port source 13 and one of the source-coupled resonators 12 in fig. 1 and 2. The reference numerals of the source coupling window 120 are only shown in fig. 1 for the sake of clarity of presentation of the structure of the dielectric filter.
Illustratively, fig. 1 and 2 exemplarily show 4 dielectric resonators 11, each dielectric resonator 11 is provided with a first blind hole 11A, the frequency of the corresponding dielectric resonator 11 can be adjusted by the depth of the first blind hole 11A, and the 4 first blind holes 11A divide the resonance region 10A into 4 dielectric resonators 11. In the present embodiment, the depth of the first blind hole 11A provided for each dielectric resonator 11 is the same, so as to obtain the dielectric resonators 11 having the same frequency.
It should be noted that the out-of-band transmission zero refers to a certain frequency point outside the passband of the filter, and the suppression of the filter on the signal of the point at the frequency point is theoretically infinite, and the addition of the out-of-band transmission zero can effectively enhance the near-end suppression of the filter, that is, the suppression of the frequency point closer to the passband. Compared with the prior art, the technical solution of this embodiment is to add the port source coupling region 10B on the dielectric body 10, that is, to increase the mechanical strength of the dielectric filter. In addition, one port source 13 can be coupled with at least one source coupling resonant cavity 12 through a source coupling window 120, and on the basis of the existing topological structure formed by at least one dielectric resonant cavity 11 in the resonant region 10A of the first surface 100 of the dielectric body 10, the topological structure of the dielectric filter is enriched, so that the number of out-of-band transmission zeros can be increased, and the out-of-band rejection capability of the dielectric filter is improved.
Wherein the number of source coupled resonators 12 coupled to one port source 13 is equal to the number of out-of-band transmission zeros that can be added. Fig. 1 and 2 schematically illustrate two source-coupled resonators 12 and two port sources 13, wherein one port source 13 is coupled to one source-coupled resonator 12 through a source coupling window 120. The embodiment of the present invention includes but is not limited to this, one or more than two port sources 13 may be provided, and each port source 13 may be coupled to two or more source-coupled resonant cavities 12.
Compared with the prior art, the technical solution provided by this embodiment adds the port source coupling region 10B to the dielectric body 10, that is, increases the mechanical strength of the dielectric filter. In addition, one port source 13 may be coupled to at least one source coupling resonant cavity 12 through a source coupling window 120, and on the basis of the existing topology structure formed by at least one dielectric resonant cavity 11 included in the resonant region 10A of the first surface 100 of the dielectric body 10, the topology structure of the dielectric filter is enriched, so that the number of out-of-band transmission zeros can be increased, and the out-of-band rejection capability of the dielectric filter is improved.
In the embodiment of the present invention, the shapes of the dielectric resonant cavity 11 and the source coupling resonant cavity 12 are not limited, and may be a rectangular parallelepiped, a square cube, or other shapes.
Fig. 3 is a top view of another dielectric filter according to an embodiment of the present invention. Fig. 4 is an isometric view of another dielectric filter provided by an embodiment of the invention. Alternatively, referring to fig. 3 and 4, the port source 13 includes a signal input port source 13S and a signal output port source 13L. In this embodiment, the signal input port source 13S and the signal output port source 13L may be coupled to the corresponding source coupling resonant cavity 12 through the source coupling window 120, and on the basis of the existing topology structure formed by at least one dielectric resonant cavity 11 in the resonant region 10A of the first surface 100 of the dielectric main body 10, the topology structure of the dielectric filter is enriched, so that the number of out-of-band transmission zeros can be increased, and the out-of-band rejection capability of the dielectric filter is improved. In addition, compared with the prior art, the port source coupling region 10B is added on the dielectric body 10, namely, the mechanical strength of the dielectric filter is increased.
In the above technical solution, one port source 13 may be coupled to at least one source-coupled resonator 12 through the source-coupled window 120, so as to increase the number of out-of-band transmission zeros. The magnitude relationship between the frequency of the source-coupled resonator 12 and the frequency of the dielectric resonator 11 affects the frequency of the out-of-band transmission zero point of the whole dielectric filter, which is increased by the coupling between the port source 13 and at least one source-coupled resonator 12 through the source coupling window 120.
Fig. 5 is a graph of the S-parameter versus frequency response of a dielectric filter provided by an embodiment of the present invention. Fig. 6 is a graph of the S-parameter versus frequency response of another dielectric filter provided by an embodiment of the present invention. Fig. 7 is a graph of the S-parameter versus frequency response of yet another dielectric filter provided by an embodiment of the present invention.
Optionally, referring to fig. 3 and 4, the first surface 100 of the dielectric body 10 is provided with a low-side source-coupled resonator and/or a high-side source-coupled resonator, the low-side source-coupled resonator having a frequency lower than the frequency of the dielectric resonator 11, and the high-side source-coupled resonator having a frequency higher than the frequency of the dielectric resonator 11.
Illustratively, referring to fig. 3, 4 and 5, the source-coupled resonator 12 corresponding to the signal input port source 13S is a low-side source-coupled resonator, and the source-coupled resonator 12 corresponding to the signal output port source 13L is a high-side source-coupled resonator, and referring to fig. 5, the frequency of the out-of-band transmission zero C1 generated by coupling the low-side source-coupled resonator with the signal input port source 13S is smaller than the bandpass frequency, and the frequency of the out-of-band transmission zero C2 generated by coupling the high-side source-coupled resonator with the signal output port source 13L is larger than the bandpass frequency.
For example, referring to fig. 3, 4 and 6, the source-coupled resonator 12 corresponding to the signal input port source 13S is a low-side source-coupled resonator, the source-coupled resonator 12 corresponding to the signal output port source 13L is a low-side source-coupled resonator, and both the out-of-band transmission zero C1 generated by the low-side source-coupled resonator coupled to the signal input port source 13S and the out-of-band transmission zero C2 generated by the low-side source-coupled resonator coupled to the signal output port source 13L have frequencies less than the bandpass frequency.
For example, referring to fig. 3, 4 and 7, the source-coupled resonator 12 corresponding to the signal input port source 13S is a high-end source-coupled resonator, the source-coupled resonator 12 corresponding to the signal output port source 13L is a high-end source-coupled resonator, and both the out-of-band transmission zero C1 generated by the high-end source-coupled resonator coupled to the signal input port source 13S and the out-of-band transmission zero C2 generated by the high-end source-coupled resonator coupled to the signal output port source 13L have frequencies greater than the band-pass frequency.
Specifically, the frequency of the source coupled resonator can be adjusted in two ways. The first solution for adjusting the frequency of the source-coupled resonator is described below.
Optionally, referring to fig. 3 and 4, source-coupled resonant cavity 12 is provided with a second blind hole 12A, a source coupling window 120 is located between second blind hole 12A and port source 13, and second blind hole 12A is used for adjusting the frequency of source-coupled resonant cavity 12.
In the present embodiment, the source coupling window 120 refers in fig. 3 and 4 to the portion of the dielectric body between the port source 13 and the corresponding second blind hole 12A. In the port source coupling region 10B, the second blind hole 12A divides the dielectric body 10 into different source coupling resonant cavities 12, and a second blind hole 12A is disposed in each source coupling resonant cavity 12. Specifically, the depths of the second blind holes 12A are different, the frequencies of the corresponding source coupling resonant cavities 12 are different, and further, the frequencies of the out-of-band transmission zeros added after the corresponding source coupling resonant cavities 12 are coupled with the port source 13 through the source coupling window 120 are different. The deeper the depth of the second blind hole 12A, the smaller the frequency of the out-of-band transmission zero point that is correspondingly increased. The shallower the depth of the second blind hole 12A, the greater the frequency of the corresponding increased out-of-band transmission zero.
Optionally, the first surface 100 of the dielectric body 10 is provided with a second deep blind hole having a depth greater than that of the first blind hole and/or a second shallow blind hole having a depth less than that of the first blind hole.
Illustratively, referring to fig. 3, 4 and 5, the second blind hole 12A in the source-coupled resonant cavity 12 corresponding to the signal input port source 13S is a second deep blind hole, and the second blind hole 12A in the source-coupled resonant cavity 12 corresponding to the signal output port source 13L is a second shallow blind hole. The source coupling resonant cavity 12 corresponding to the signal input port source 13S is a low-end source coupling resonant cavity, the source coupling resonant cavity 12 corresponding to the signal output port source 13L is a high-end source coupling resonant cavity, the frequency of the out-of-band transmission zero C1 generated by coupling the low-end source coupling resonant cavity with the signal input port source 13S is smaller than the band-pass frequency, and the frequency of the out-of-band transmission zero C2 generated by coupling the high-end source coupling resonant cavity with the signal output port source 13L is larger than the band-pass frequency.
Illustratively, referring to fig. 3, 4 and 6, the second blind hole 12A in the source-coupled resonant cavity 12 corresponding to the signal input port source 13S is a second deep blind hole, and the second blind hole 12A in the source-coupled resonant cavity 12 corresponding to the signal output port source 13L is a second deep blind hole. The source coupling resonant cavity 12 corresponding to the signal input port source 13S is a low-end source coupling resonant cavity, the source coupling resonant cavity 12 corresponding to the signal output port source 13L is a low-end source coupling resonant cavity, and both the frequency of the out-of-band transmission zero point C1 generated by coupling the low-end source coupling resonant cavity with the signal input port source 13S and the frequency of the out-of-band transmission zero point C2 generated by coupling the low-end source coupling resonant cavity with the signal output port source 13L are smaller than the band-pass frequency.
Illustratively, referring to fig. 3, 4 and 7, the second blind hole 12A in the source-coupled resonant cavity 12 corresponding to the signal input port source 13S is a second shallow blind hole, and the second blind hole 12A in the source-coupled resonant cavity 12 corresponding to the signal output port source 13L is a second shallow blind hole. The source coupling resonant cavity 12 corresponding to the signal input port source 13S is a high-end source coupling resonant cavity, the source coupling resonant cavity 12 corresponding to the signal output port source 13L is a high-end source coupling resonant cavity, and the frequencies of the out-of-band transmission zero point C1 generated by coupling the high-end source coupling resonant cavity with the signal input port source 13S and the out-of-band transmission zero point C2 generated by coupling the high-end source coupling resonant cavity with the signal output port source 13L are both greater than the band-pass frequency.
The specific structure of the arrangement of the resonance region 10A of the first surface 100 of the dielectric body 10 will be specifically described below.
Optionally, referring to fig. 3 and 4, the resonance region 10A of the first surface 100 of the dielectric body 10 is provided with at least two dielectric resonance cavities 11 and at least one negative coupling structure 14, the dielectric body 10 between the first blind holes 11A constitutes a dielectric coupling window 110, the dielectric coupling window 110 is used for coupling adjacent dielectric resonance cavities 11, the negative coupling structure 14 is used for coupling adjacent dielectric resonance cavities, and part or all of the projection of the negative coupling structure 14 on the dielectric body 10 overlaps with the projection of the dielectric coupling window 110 on the dielectric body 10. Fig. 3 and 4 illustrate an exemplary embodiment where the portion of the negative coupling structure 14 projected onto the media body 10 overlaps the projection of the media coupling window 110 onto the media body 10.
Specifically, fig. 3 and 4 exemplarily show 4 dielectric resonators 11, each dielectric resonator 11 is provided with a first blind hole 11A, and the frequency of the corresponding dielectric resonator 11 can be adjusted by the depth of the first blind hole 11A. The 4 dielectric resonators 11 in this embodiment are a first dielectric resonator 111, a second dielectric resonator 112, a third dielectric resonator 113, and a fourth dielectric resonator 114, respectively. The 4 dielectric resonant cavities 11 are coupled through the dielectric coupling window 110 formed by the dielectric body 10 between the first blind holes 11A, which is called inductive coupling or positive coupling. The negative coupling structure 14 is used to couple adjacent dielectric cavities 11 and is referred to as capacitive coupling or negative coupling. Referring to fig. 5, 6, and 7, the technical solution in this embodiment enriches the topology of the dielectric filter, and increases out-of-band transmission zeros C3 and C4, thereby effectively enhancing the near-end rejection of the dielectric filter. It should be noted that, due to the arrangement of the port source coupling region 10B, the material of the dielectric body 10 is increased, and the influence of the arrangement of the negative coupling structure 14 on the mechanical strength of the dielectric filter can be ignored on the basis of enhancing the mechanical strength of the dielectric filter and increasing the out-of-band transmission zeros C1 and C2. The size of the dielectric coupling window 110 may affect the coupling strength of the adjacent dielectric resonator 11 and correspondingly increase the strength of the out-of-band transmission zero. The larger the dielectric coupling window 110, the greater the coupling strength of the adjacent dielectric resonator 11 and the corresponding increased strength of the out-of-band transmission zero.
Optionally, referring to fig. 3 and 4, the first surface of the dielectric body 10 between the two first blind holes 11A is provided with at least one negative coupling recess as a negative coupling structure 14.
Specifically, the negative coupling grooves form a negative coupling structure for coupling the adjacent dielectric resonators 11, which is called capacitive coupling or negative coupling. The topological structure of the dielectric filter is enriched, and out-of-band transmission zeros C3 and C4 are added, so that the near-end rejection of the dielectric filter is effectively enhanced. And because the port source coupling region 10B is arranged, the material of the dielectric body 10 is increased, and the influence of the arrangement of the negative coupling structure 14 on the mechanical strength of the dielectric filter can be ignored on the basis of enhancing the mechanical strength of the dielectric filter and increasing out-of-band transmission zeros C1 and C2.
Optionally, the negative coupling groove is a T-shaped negative coupling groove, but the shape of the negative coupling groove is not limited in the embodiment of the present invention. Optionally, the depth of the negative coupling groove is greater than or equal to 1/3 the thickness of the dielectric body 10 and less than the thickness of the dielectric body 10, within which depth the coupling strength of the adjacent dielectric resonator 11 and the strength of the added out-of-band transmission zeroes C3 and C4 can be adjusted by adjusting the depth of the negative coupling groove.
A second solution for adjusting the frequency of the source-coupled resonator is described below.
Optionally, the volume of the low-end source coupling resonant cavity is larger than that of the medium resonant cavity, and the volume of the high-end source coupling resonant cavity is smaller than that of the medium resonant cavity.
Fig. 8 is a plan view of another dielectric filter according to an embodiment of the present invention.
Illustratively, referring to fig. 8 and 5, the volume of the source-coupled resonator 12 corresponding to the signal input port source 13S is greater than the volume of the dielectric resonator 11, and the volume of the source-coupled resonator 12 corresponding to the signal output port source 13L is less than the volume of the dielectric resonator 11. The source coupling resonant cavity 12 corresponding to the signal input port source 13S is a low-end source coupling resonant cavity, the source coupling resonant cavity 12 corresponding to the signal output port source 13L is a high-end source coupling resonant cavity, the frequency of the out-of-band transmission zero C1 generated by coupling the low-end source coupling resonant cavity with the signal input port source 13S is smaller than the band-pass frequency, and the frequency of the out-of-band transmission zero C2 generated by coupling the high-end source coupling resonant cavity with the signal output port source 13L is larger than the band-pass frequency.
It should be noted that fig. 8 only shows that the volume of the source-coupled resonant cavity 12 corresponding to the signal input port source 13S is larger than the volume of the dielectric resonant cavity 11, and the volume of the source-coupled resonant cavity 12 corresponding to the signal output port source 13L is smaller than the volume of the dielectric resonant cavity 11. The following two solutions are not shown in the figures.
Illustratively, the volume of the source-coupled resonant cavity 12 corresponding to the signal input port source 13S may be larger than the volume of the dielectric resonant cavity 11, and the volume of the source-coupled resonant cavity 12 corresponding to the signal output port source 13L may be larger than the volume of the dielectric resonant cavity 11. The source coupling resonant cavity 12 corresponding to the signal input port source 13S is a low-end source coupling resonant cavity, the source coupling resonant cavity 12 corresponding to the signal output port source 13L is a low-end source coupling resonant cavity, and both the frequency of the out-of-band transmission zero point C1 generated by coupling the low-end source coupling resonant cavity with the signal input port source 13S and the frequency of the out-of-band transmission zero point C2 generated by coupling the low-end source coupling resonant cavity with the signal output port source 13L are smaller than the band-pass frequency.
Illustratively, the volume of the source-coupled resonant cavity 12 corresponding to the signal input port source 13S may be smaller than the volume of the dielectric resonant cavity 11, and the volume of the source-coupled resonant cavity 12 corresponding to the signal output port source 13L may be smaller than the volume of the dielectric resonant cavity 11. The source coupling resonant cavity 12 corresponding to the signal input port source 13S is a high-end source coupling resonant cavity, the source coupling resonant cavity 12 corresponding to the signal output port source 13L is a high-end source coupling resonant cavity, and the frequencies of the out-of-band transmission zero point C1 generated by coupling the high-end source coupling resonant cavity with the signal input port source 13S and the out-of-band transmission zero point C2 generated by coupling the high-end source coupling resonant cavity with the signal output port source 13L are both greater than the band-pass frequency.
In order to prevent input or output electromagnetic wave signals between different port sources from interfering with each other, the embodiment of the invention provides the following technical scheme:
optionally, referring to fig. 3 and 4, the dielectric body 10 of the port source coupling region 10B is provided with at least one first isolation groove 15, the first isolation groove 15 is disposed between the source coupling resonant cavities 12, the first isolation groove 15 penetrates through a first surface 100 of the dielectric body 10 and a second surface 101 disposed opposite to the first surface 100, and a projection of the first isolation groove 15 on the dielectric body 10 does not overlap with a projection of the source coupling window 120 on the dielectric body 10.
Specifically, the first isolation groove 15 is disposed between the source-coupled resonant cavities 12, and is configured to isolate mutual interference between the two port sources 13 and respective corresponding source-coupled resonant cavities 12, so as to prevent input or output electromagnetic wave signals between different port sources 13 from being interfered with each other. Optionally, referring to fig. 3 and 4, the dielectric body 10 of the resonance region 10A is provided with at least one second isolation groove 16, the second isolation groove 16 being provided between the first blind holes 11A. The second isolation recess 16 extends through a second surface 101 of the first surface 100 of the dielectric body 10 opposite to the first surface 100, a projection of the second isolation recess 16 on the dielectric body 10 does not overlap a projection of the dielectric coupling window 110 on the dielectric body 10, and a projection of the second isolation recess 16 on the dielectric body 10 does not overlap a projection of the negative coupling structure 14 on the dielectric body 10.
Specifically, the second isolation groove 16 is disposed between the first blind holes 11A, that is, between the dielectric resonators 11, and is used for adjusting the coupling strength between the dielectric resonators 11, and the larger the groove area of the second isolation groove 16 is, the more the material is removed from the dielectric body 10, the weaker the coupling strength between the dielectric resonators 11 is. The smaller the second isolation groove 16 open area, the stronger the coupling strength between the dielectric resonators 11 for less material removed from the dielectric body 10.
In the above technical solution, one port source 13 may be coupled with at least one source coupling resonant cavity 12 through a source coupling window 120, and on the basis of the existing topology structure formed by at least one dielectric resonant cavity 11 included in the resonant region 10A of the first surface 100 of the dielectric body 10, the topology structure of the dielectric filter is enriched, so that the number of out-of-band transmission zeros can be increased, and the out-of-band rejection capability of the dielectric filter is improved. The specific structure of the port source 13 is further refined below.
Optionally, referring to fig. 3 and 4, the first surface 100 of the dielectric body 10 is provided with at least one through hole 17, the dielectric body 10 between the through hole 17 and the port source 13 constituting a source coupling window 120.
In particular, the dielectric body 10 between the via 17 and the port source 13 constitutes a source coupling window 120.
The size of source coupling window 120 may affect the strength of the coupling between port source 13 and source coupled resonator 12, and thus the strength of the added out-of-band transmission zero. The larger the source coupling window 120, the greater the strength of the coupling between the port source 13 and the source coupled resonator 12, and the strength of the added out-of-band transmission zero.
Illustratively, in the dielectric filter shown in fig. 3 and 4, each source-coupled resonant cavity 12 is provided with two through holes 17, the straight line of the two through holes 17 coincides with the straight line of the two port sources 13, the structure is configured such that the source-coupled window 120 of the port source 13 is distributed in the dielectric body between the through holes 17 and the port source 13, that is, near the port source 13, and in the straight line direction of the two through holes 17, the dielectric body of the through holes 17 away from the port source 13 cannot be used as the source-coupled window 120 to couple the port source 13 and the source-coupled resonant cavity 12, so as to isolate mutual interference between the two port sources 13 and respective coupled signals of the source-coupled resonant cavity 12, and further avoid that input or output electromagnetic wave signals between different port sources 13 do not interfere with each other.
FIG. 9 is a cross-sectional view of the port source of FIG. 3 taken in the direction D1-D2. Alternatively, referring to fig. 9, the port source 13 includes an insulating isolation region 130 and a conductive portion 131, the insulating isolation region 130 is located on the first surface of the dielectric body 10 and surrounds the conductive portion 131.
Specifically, the isolation region 130 is to isolate the port source 13 and the source-coupled resonator 12 from each other. In addition, the insulating isolation region 130 can be provided with a welding structure on the insulating isolation region 130, so that an external device connected with the port source 13 can be manufactured conveniently.
Optionally, referring to fig. 4 and 9, a second surface 101 of the media body 10 opposite the first surface 100 is provided with a third blind hole 18, the projection of the third blind hole 18 in the media body 10 being located within the projection of the port source 13 in the media body 10.
Specifically, the time delay of the port source 13 can be adjusted by adjusting the depth of the third blind hole 18.
Optionally, referring to fig. 9, a shielding layer 20 is further included, the shielding layer 20 surrounding the dielectric body 10, wherein the shielding layer 20 is provided with an isolation groove exposing the port source 13. Specifically, the shielding layer 20 can prevent the interference of the external signal to the electromagnetic wave signal input or output by the dielectric filter.
Alternatively, the conductive portion 131 and the shield layer 20 may be prepared from the same conductive layer. It should be noted that the shielding layer 20 surrounds the dielectric body 10, that is, the shielding layer 20 covers the surface of the dielectric body, and the sidewalls and the bottom surfaces of the various first blind via 11A, second blind via 12A, third blind via 18 and negative coupling recess, and the sidewalls of the first isolation recess 15, second isolation recess 16 and through hole 17. In this embodiment, the intensity and frequency of the out-of-band transmission zero point of the dielectric filter can also be adjusted by adjusting the areas of the shielding layers 20 covering the side walls and the bottom surfaces of the first blind via 11A, the second blind via 12A, the third blind via 18 and the groove, and the side walls of the first isolation groove 15, the second isolation groove 16 and the through hole 17, respectively.
Alternatively, the dielectric body 10 may be composed of a solid ceramic material having a high relative permittivity that facilitates propagation of electromagnetic wave signals within the dielectric body 10 without passing out of the shield layer 20.
One of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.
In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present invention are intended to be within the scope of the claims.
Claims (14)
1. A dielectric filter, comprising:
a dielectric body comprising a resonant region and a port source coupling region located to one side of the resonant region;
at least one medium resonant cavity is arranged in a resonant area of the first surface of the medium main body, each medium resonant cavity is provided with a first blind hole, and the first blind holes are used for adjusting the frequency of the medium resonant cavities;
the port source coupling area of the first surface of the medium body is provided with at least one source coupling resonant cavity and at least one port source, the source coupling resonant cavity is provided with an active coupling window, and the source coupling window is used for adjusting the coupling strength of at least one port source and at least one source coupling resonant cavity.
2. The dielectric filter of claim 1, wherein the port sources include a signal input port source and a signal output port source.
3. The dielectric filter of claim 1, wherein the first surface of the dielectric body is provided with a low-side source-coupled resonator and/or a high-side source-coupled resonator, the low-side source-coupled resonator having a frequency less than the frequency of the dielectric resonator, and the high-side source-coupled resonator having a frequency greater than the frequency of the dielectric resonator.
4. The dielectric filter of claim 1, wherein the source-coupled resonant cavity is provided with a second blind hole, the source-coupled window is located between the second blind hole and the port source, and the second blind hole is used for adjusting the frequency of the source-coupled resonant cavity.
5. The dielectric filter of claim 4, wherein the first surface of the dielectric body is provided with a second deep blind via having a depth greater than a depth of the first blind via and/or a second shallow blind via having a depth less than a depth of the first blind via.
6. A dielectric filter according to claim 1, wherein the resonant region of the first surface of the dielectric body is provided with at least two dielectric resonant cavities and at least one negative coupling structure, the dielectric body between the first blind holes constitutes a dielectric coupling window for coupling the adjacent dielectric resonant cavities, the negative coupling structure is used for coupling the adjacent dielectric resonant cavities, and part or all of the projection of the negative coupling structure on the dielectric body overlaps with the projection of the dielectric coupling window on the dielectric body.
7. A dielectric filter as recited in claim 6, wherein the first surface of the dielectric body between two of the first blind vias is provided with at least one negative coupling recess, the negative coupling recess acting as the negative coupling structure.
8. A dielectric filter as recited in claim 3, wherein the volume of the low-side source-coupled resonator is greater than the volume of the dielectric resonator, and the volume of the high-side source-coupled resonator is less than the volume of the dielectric resonator.
9. The dielectric filter according to claim 1, wherein the dielectric body of the port source coupling region is provided with at least one first isolation groove, the first isolation groove is disposed between the source coupling resonant cavities, the first isolation groove penetrates through a second surface of the dielectric body, which is disposed opposite to the first surface, a projection of the first isolation groove on the dielectric body is non-overlapped with a projection of the source coupling window on the dielectric body.
10. The dielectric filter of claim 6, wherein the dielectric body of the resonance region is provided with at least one second isolation groove, the second isolation groove is disposed between the first blind holes, the second isolation groove penetrates through a second surface of the first surface of the dielectric body, the second surface is disposed opposite to the first surface, a projection of the second isolation groove on the dielectric body has no overlap with a projection of the dielectric coupling window on the dielectric body, and a projection of the second isolation groove on the dielectric body has no overlap with a projection of the negative coupling structure on the dielectric body.
11. A dielectric filter as claimed in claim 1, wherein the first surface of the dielectric body is provided with at least one through hole, the dielectric body between the through hole and the port source constituting the source coupling window.
12. The dielectric filter of claim 1, wherein the port source comprises an insulating isolation region and a conductive portion, the insulating isolation region being located at the first surface of the dielectric body and surrounding the conductive portion.
13. The dielectric filter of claim 1, wherein a second surface of the dielectric body opposite the first surface is provided with a third blind hole, a projection of the third blind hole at the dielectric body being located within a projection of the port source at the dielectric body.
14. The dielectric filter of claim 1, further comprising a shield layer surrounding the dielectric body, wherein the shield layer is provided with an isolation slot exposing the port source.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010814838.XA CN113258231A (en) | 2020-08-13 | 2020-08-13 | Dielectric filter |
| PCT/CN2021/112063 WO2022033518A1 (en) | 2020-08-13 | 2021-08-11 | Dielectric filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010814838.XA CN113258231A (en) | 2020-08-13 | 2020-08-13 | Dielectric filter |
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| CN202010814838.XA Pending CN113258231A (en) | 2020-08-13 | 2020-08-13 | Dielectric filter |
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| WO (1) | WO2022033518A1 (en) |
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| CN115295983B (en) * | 2022-07-26 | 2024-01-02 | 武汉凡谷电子技术股份有限公司 | Filter |
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| US20110279200A1 (en) * | 2010-05-17 | 2011-11-17 | Reddy Vangala | Dielectric Waveguide Filter with Structure and Method for Adjusting Bandwidth |
| CN203218423U (en) * | 2013-04-16 | 2013-09-25 | 深圳光启创新技术有限公司 | Cavity filter |
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| CN110098456A (en) * | 2019-05-24 | 2019-08-06 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
| CN110896163A (en) * | 2019-11-19 | 2020-03-20 | 摩比科技（深圳）有限公司 | Dielectric waveguide filter capable of realizing single out-of-band transmission zero |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11264687B2 (en) * | 2018-04-03 | 2022-03-01 | Intel Corporation | Microelectronic assemblies comprising a package substrate portion integrated with a substrate integrated waveguide filter |
| CN110828947B (en) * | 2019-11-15 | 2021-09-07 | 中国电子科技集团公司第二十六研究所 | Cross-coupling dielectric waveguide filter |
| CN111129669A (en) * | 2020-01-08 | 2020-05-08 | 摩比天线技术（深圳）有限公司 | Hybrid electromagnetic coupling all-dielectric filter |
-
2020
- 2020-08-13 CN CN202010814838.XA patent/CN113258231A/en active Pending
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2021
- 2021-08-11 WO PCT/CN2021/112063 patent/WO2022033518A1/en active Application Filing
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| US5926079A (en) * | 1996-12-05 | 1999-07-20 | Motorola Inc. | Ceramic waveguide filter with extracted pole |
| US20110279200A1 (en) * | 2010-05-17 | 2011-11-17 | Reddy Vangala | Dielectric Waveguide Filter with Structure and Method for Adjusting Bandwidth |
| CN203218423U (en) * | 2013-04-16 | 2013-09-25 | 深圳光启创新技术有限公司 | Cavity filter |
| CN208548438U (en) * | 2018-06-06 | 2019-02-26 | 深圳三星通信技术研究有限公司 | A kind of TEM mould dielectric filter |
| CN110098456A (en) * | 2019-05-24 | 2019-08-06 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
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| WO2022033518A1 (en) | 2022-02-17 |
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Application publication date: 20210813 |