CN217062462U - Microwave low-pass filter with trapezoidal groove air gap - Google Patents
Microwave low-pass filter with trapezoidal groove air gap Download PDFInfo
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- CN217062462U CN217062462U CN202220950183.3U CN202220950183U CN217062462U CN 217062462 U CN217062462 U CN 217062462U CN 202220950183 U CN202220950183 U CN 202220950183U CN 217062462 U CN217062462 U CN 217062462U
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Abstract
The utility model discloses a microwave low-pass filter with a trapezoidal groove air gap, which belongs to the technical field of electronic communication, and can effectively filter waves by utilizing the microwave low-pass filter, so that the bandwidth and the anti-electromagnetic interference capability are more excellent; the filter cavity comprises an artificial plasmon segment and slot line waveguide segments arranged on two sides of the artificial plasmon segment, wherein a plurality of trapezoidal groove air gaps are symmetrically distributed on the upper side and the lower side of the artificial plasmon segment, and the trapezoidal groove air gaps are arranged at intervals.
Description
Technical Field
The utility model relates to an electronic communication's technical field, more specifically says, especially relates to a microwave low pass filter with trapezoidal recess air gap.
Background
With the arrival of the big data era, the demand of information is explosively increased, and the mobile communication field requires to manufacture microwave devices with higher integration level, however, along with the higher and higher integration level of microwave circuits, the microwave circuits begin to generate electromagnetic interference noise, and the RC delay causes the problems of unstable circuit operation and the like. The artificial surface plasmon type microwave circuit has the characteristics of strong anti-electromagnetic interference capability, high sensitivity and large bandwidth, and can well meet the requirements of next-generation microwave communication. In order to meet the requirement of the microwave low-pass filter, it is imperative to design a microwave low-pass filter that can better resist the electromagnetic interference noise and avoid the RC delay.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a microwave low pass filter with trapezoidal recess air gap utilizes this microwave low pass filter to carry out can effective filtering, and its bandwidth and anti-electromagnetic interference ability are more excellent.
The utility model adopts the technical scheme as follows:
the utility model provides a microwave low pass filter with trapezoidal recess air gap, includes the dielectric layer, wherein, the dielectric layer inboard be equipped with interconnect's metal microstrip, metal microstrip in be equipped with the filtering chamber, the filtering chamber include artifical plasmon section and set up the slot line waveguide section in artifical plasmon section both sides, artifical plasmon section in the upper and lower side symmetric distribution have a plurality of trapezoidal recess air gaps, it is a plurality of trapezoidal recess air gap interval arrangement.
Further, the width G of the short side of the groove air gap 1 The value of (2) is 0.5-1 mm, and the width G of the long edge of the air gap of the groove 2 The value of (3) is 3-5 mm, the depth M of the groove air gap is 3-5 mm, and the distance P between every two adjacent groove air gaps is 4-5 mm.
Further, the exponential curve equation of the slot line waveguide section is as follows:
y＝t+v*(exp(b*x/L1-1)/(exp(b)-1)；
wherein t is an exponential curve position coefficient, and the value of t is 0.2-18; v is an index curve shape coefficient, and the value of v is 0.1-9; and b is an exponential curve shape coefficient, and the value is 1-20.
Further, the length L of the slot line waveguide section 1 Is 8-15 mm, and the length L of the artificial plasmon section 2 The value of (a) is 90-120 mm.
Furthermore, the total width W of the dielectric layer is 15-30 mm, the total thickness Sub of the dielectric layer is 0.4-0.6 mm, and the total width H of the metal microstrip is 11-15 mm.
Furthermore, the total width W of the dielectric layer is 20-50 mm, the total thickness Sub of the dielectric layer is 0.4-0.6 mm, and the total width H of the metal microstrip is 11-15 mm.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
the utility model discloses a microwave low pass filter with trapezoidal recess air gap, through the metal microstrip that is equipped with interconnect in the dielectric layer inboard, be equipped with the filtering chamber among the metal microstrip, the filtering chamber includes artifical plasmon section and sets up the slot line waveguide section in artifical plasmon section both sides, the middle and lower side symmetric distribution in artifical plasmon section has a plurality of trapezoidal recess air gaps, a plurality of trapezoidal recess air gap interval arrangements, utilize slot line waveguide section to realize microwave signal's input and output, a plurality of trapezoidal recess air gaps that utilize artifical plasmon section upper and lower side symmetry to set up, can fully improve the constraint effect of microwave band subwavelength, make microwave low pass filter's bandwidth and anti-electromagnetic interference ability more excellent.
The utility model discloses a microwave low pass filter, the passband scope and the stop band rejection characteristic of regulation and control wave filter that can be accurate through the geometric dimensions who adjusts trapezoidal recess air gap especially set up trapezoidal recess air gap and do not increase the whole geometric dimensions of wave filter on the metal microstrip, have further optimized low pass filter's filtering characteristic when guaranteeing the miniaturization.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic front structural view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is a graph of S-parameter characteristic of a microwave low-pass filter according to an embodiment of the present invention;
fig. 4 is a normal electric field distribution diagram of the microwave low-pass filter according to the embodiment of the present invention when the microwave low-pass filter operates at 4.5 GHz.
Wherein: 1-a dielectric layer, 2-a metal microstrip, 3-an artificial surface plasmon cavity, 4-a slot line waveguide section and 5-a groove air gap.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following detailed description, but the present invention is not limited thereto.
Referring to fig. 1 to 4, a microwave low pass filter with trapezoidal groove air gap according to the present invention includes a dielectric layer 1, wherein, the inner side of the medium layer 1 is provided with metal microstrips 2 which are connected with each other, a filter cavity is arranged in the metal microstrips 2, the filtering cavity comprises an artificial plasmon section 3 and slot line waveguide sections 4 arranged at two sides of the artificial plasmon section 3, the artificial plasmon section 3 is provided with a plurality of trapezoidal groove air gaps 5 which are symmetrically distributed at the upper side and the lower side, the trapezoidal groove air gaps 5 are arranged at intervals, the input and the output of microwave signals are realized by utilizing the groove line waveguide section 1, and the constraint effect of microwave band sub-wavelength can be fully improved by utilizing the trapezoidal groove air gaps 5 which are symmetrically arranged at the upper side and the lower side of the artificial plasmon section 2, so that the bandwidth and the anti-electromagnetic interference capability of the microwave low-pass filter are more excellent.
The width G of the short side of the groove air gap 5 1 Is 0.5-1 mm, the width G of the long edge of the groove air gap 5 2 The depth M of the groove air gaps 5 is 3-5 mm, and the distance P between every two adjacent groove air gaps 5 is 4-5 mm.
The exponential curve equation of the slot line waveguide section 4 is:
y＝t+v*(exp(b*x/L1-1)/(exp(b)-1)；
wherein t is an exponential curve position coefficient and is 0.2-18; v is an index curve shape coefficient, and the value of v is 0.1-9; and b is an index curve shape coefficient, and the value is 1-20.
The length L of the slot line waveguide section 4 1 Is 8-15 mm, the length L of the artificial plasmon section 3 2 The value of (a) is 90-120 mm.
The total width W of the dielectric layer 1 is 15-30 mm, the total thickness Sub of the dielectric layer 1 is 0.4-0.6 mm, and the total width H of the metal microstrip 2 is 11-15 mm.
The utility model discloses a microwave low pass filter, the passband scope and the stop band rejection characteristic of regulation and control wave filter that can be accurate through the geometric dimension who adjusts trapezoidal recess air gap especially set up trapezoidal recess air gap and do not increase the whole geometric dimension of wave filter on the metal microstrip, have further optimized low pass filter's filter characteristic when guaranteeing the miniaturization. The utility model discloses a microwave low pass filter can be applied to among the civilian microwave communication system of L ~ S wave band, has certain engineering practical value.
Examples
A microwave low-pass filter with trapezoidal grooved air gaps has the same structure as the embodiment, the microwave low-pass filter adopts a substrate with the dielectric constant of 2.65, and specific structural parameters of each part in the filter are shown in the table I.
TABLE 1 physical dimensions of the parts of the microwave low-pass filter (unit: mm)
| Name of structure | (symbol) | Size of |
| Length of the slot line waveguide section 4 | L 1 | 12 |
| Length of artificial plasmon segment 3 | L 2 | 103 |
| Short side width of groove air gap 5 | G 1 | 0.8 |
| The width of the long side of the groove air gap 5 | G 2 | 4.0 |
| Depth of the groove air gap 5 | M | 4.0 |
| The distance between the |
P | 4.5 |
| Total width of dielectric plate | W | 20.5 |
| Total width of metal microstrip | H | 12.4 |
| Exponential curve position coefficient | t | 2.8 |
| Coefficient of exponential curve | a | 11.5 |
| Coefficient of exponential curve | v | 5.0 |
| Thickness of dielectric plate | Sub | 0.5 |
The microwave low-pass filter is tested, a filter characteristic curve of the microwave low-pass filter is obtained, the filter characteristic curve is calculated through finite difference of time domains, and the calculation is shown in a graph 3, in the graph 3, S1 and 1 is a reflection coefficient of the filter, S2 and 1 are transmission coefficients of the filter, the filter is low-pass filtering, the center frequency of the filter is 2.715GHz, the insertion loss of the filter is 1.8dB, the pass band of the microwave low-pass filter ranges from direct current to 5.43GHz, the reflection coefficient of the filter in the whole pass band is smaller than 8.7dB, ripple jitter is smaller than 0.8dB, and the anti-electromagnetic interference capability of the filter is strong.
When the microwave low-pass filter is placed in a 4.5GHz frequency band to work, an electric field distribution diagram in the normal direction around the loading unit is obtained and is shown in fig. 4, as can be seen from fig. 4, when the microwave low-pass filter works in a passband, a microwave electric field of the microwave low-pass filter is mainly bound around a gap of a triangular metal microstrip formed by two adjacent groove air gaps 5, leakage is little, and the anti-electromagnetic interference capability of the microwave low-pass filter is effectively improved.
The above description is only for the preferred embodiment of the present invention, and all modifications, equivalents, improvements and the like made within the spirit and scope of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a microwave low pass filter with trapezoidal recess air gap, includes dielectric layer (1), its characterized in that, dielectric layer (1) inboard be equipped with interconnect's metal microstrip (2), metal microstrip (2) in be equipped with the filtering cavity, the filtering cavity include artifical plasmon section (3) and set up slot line waveguide section (4) in artifical plasmon section (3) both sides, artifical plasmon section (3) in the middle and upper downside symmetric distribution have a plurality of trapezoidal recess air gaps (5), a plurality of trapezoidal recess air gap (5) interval arrangement.
2. A microwave low-pass filter with trapezoidal groove air gaps according to claim 1, characterized in that the width G of the short side of the groove air gap (5) 1 Is 0.5-1 mm, and the width G of the long edge of the groove air gap (5) 2 The value of (2) is 3-5 mm, the depth M of the groove air gaps (5) is 3-5 mm, and the distance P between every two adjacent groove air gaps (5) is 4-5 mm.
3. A microwave low-pass filter with a trapezoidal groove air gap according to claim 2, characterized in that the exponential curve equation of the slot line waveguide section (4) is:
y＝t+v*(exp(b*x/L1-1)/(exp(b)-1)；
wherein t is an exponential curve position coefficient and is 0.2-18; v is an exponential curve shape coefficient, and the value of v is 0.1-9; and b is an index curve shape coefficient, and the value is 1-20.
4. A microwave low-pass filter with a trapezoidal groove air gap according to claim 3, characterized in that the length L of the slot line waveguide section (4) 1 Is 8-15 mm, and the length L of the artificial plasmon section (3) 2 The value of (a) is 90-120 mm.
5. The microwave low-pass filter with the trapezoidal groove air gap as claimed in claim 1, wherein the total width W of the dielectric layer (1) is 15-30 mm, the total thickness Sub of the dielectric layer (1) is 0.4-0.6 mm, and the total width H of the metal microstrip (2) is 11-15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220950183.3U CN217062462U (en) | 2022-04-21 | 2022-04-21 | Microwave low-pass filter with trapezoidal groove air gap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220950183.3U CN217062462U (en) | 2022-04-21 | 2022-04-21 | Microwave low-pass filter with trapezoidal groove air gap |
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| Publication Number | Publication Date |
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| CN217062462U true CN217062462U (en) | 2022-07-26 |
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| CN202220950183.3U Active CN217062462U (en) | 2022-04-21 | 2022-04-21 | Microwave low-pass filter with trapezoidal groove air gap |
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