JPS61277205A - Dielectric resonator device - Google Patents

Abstract

PURPOSE:To make a device small-sized and low-cost by providing the first, the second and the third external coupling means coupled to resonators and the fourth external coupling means coupled to the first the third resonators as external coupling means. CONSTITUTION:The first, the second, and the third external coupling means coupled to resonators and the fourth external coupling means coupled to the first - the third resonators are provided as external coupling means. For the purpose of preventing mutual interference between electromagnetic fields of the TM110 mode with which prismatic dielectrics 2b and 2c are concerned, coupling control means 4b and 5b in a plane including prismatic dielectrics 2b and 2c together are projected from ridge parts 6b and 7b of a case 1 into the case 1. For the purpose of preventing mutual interference between electromagnetic fields of the TM110 mode with which prismatic dielectrics 2c and 2a are concerned, coupling control means 4c and 5c are projected from ridge parts 6c and 7c of the case 1 into the case 1. Mutual interference among triple modes is prevented to store three resonators electrically orthogonal to one another in one case. Thus, the device is made small-sized and low-cost.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dielectric resonator device that utilizes resonance of the TM110 mode (hereinafter simply referred to as TM110 mode) or a modified mode thereof in a rectangular cavity.

(Prior art) As a filter using TMI 10 mode, Japanese Patent Application Laid-open No. 5
There is one known in Japanese Patent No. 3-119650. Such filters have a single linear cylinder or prismatic dielectric inside a case that serves as a shield case, and are combined in the required number of stages to form one stage of resonator.

This has limited the ability to meet the eternal demands of the telecommunications equipment industry for smaller size and lower prices.

Furthermore, channel filters are used, for example, in transmission sharing devices for mobile phone base stations. This channel filter has one or more channels CH as shown in FIG.
The structure is such that the output sides of a plurality of filters F1, F2, . . . , FN, which pass only the signals of F1, CH2, . Each filter uses a cavity resonator, a TEOIJ dielectric resonator, or a TMo1o dielectric resonator. In any case, since the configuration is a combination of a plurality of filters configured in the form of one for each channel, there has been a strong demand for miniaturization.

(Problems to be Solved by the Invention) Therefore, an object of the present invention is to provide a small and low-cost dielectric resonator device for use in, for example, a channel filter.

(Means for Solving the Problems) The dielectric resonator device of the present invention has three columnar If1 bodies integrated with mutually perpendicular kidneys disposed in a rectangular parallelepiped hollow shield case. A dielectric resonator comprising a dielectric resonator that utilizes three TM11° modes existing in each axis direction or their deformation mode resonance, and an external coupling means for coupling the dielectric resonator to an external circuit. In the device, the external coupling means includes a first external coupling means coupled to the first resonator, a second external coupling means coupled to the second resonator,
It is characterized by having a third external coupling means coupled to the third resonator and a fourth external coupling means coupled to the first, second and third resonators.

(Function) With such a means, a solid dielectric material with a dielectric constant overwhelmingly larger than that of air is produced in the direction of each electric line of force of the triple degenerate TMlt o mode, which is the lowest order resonance mode of the rectangular parallelepiped cavity resonator. Due to its presence, the external dimensions become smaller. The signal input to the first external coupling means is output from the fourth external coupling means. The signal input to the second external coupling means is output from the fourth external coupling means.

The signal input to the third external coupling means is output from the fourth external coupling means. Of course, the reverse usage is also possible, so the signal input to the fourth external coupling means is output from the first to 1lj3 external coupling means according to the resonant frequency of each dielectric resonator.

(Example) FIG. 1 is a perspective view showing the main parts of the present invention. In the figure, 1 is a rectangular parallelepiped hollow shield case, and 2 is three columnar dielectrics (the illustrated example is a columnar dielectric with a square cross section).
It is a composite dielectric material in which 2a, 2b, and 2c are integrated in a state where they are perpendicular to each other. The composite dielectric shown in the figure is
It is illustrated in an ideal shape with no partial deformation due to processing technology. Case 1 may be a metal case or, for example, the same (Zr Sn )Ti 04 as composite dielectric 2.
A shield electrode film may be provided on the inner or outer surface of a rectangular parallelepiped cavity made of ceramic. In any case, both axial ends of the composite dielectric must maintain good contact with the case 1 or the shield electrode film.

As the composite dielectric 2, (Zr 3n )Ti 04 ceramic was used. The dielectric constant (ε) is 37.5, and the material temperature coefficient (ηF==-α−1/2ηε) is 0±0.5ppm/
It's ℃.

With this configuration, while inheriting the advantages of conventional filters using TMl 10 mode, such as ■ obtaining high no-load Q and ■ being compact, compared to filters using conventional TM110 mode, It was possible to substantially reduce the volume of the resonator device to ⅓.

By the way, as shown in Figs. 2 to 4, this book is based on a case in which a rectangular cavity is provided with a composite dielectric 3 in which two columnar dielectrics 3a and 3b are integrated in a cross shape in a state perpendicular to each other. Discuss the difference from invention.

With the configuration shown in Figures 2 to 4, the X
TM+10 mode with electric lines of force running in the axial direction and TM with electric lines of force running in the Y-axis direction as shown in Figure 3.
110 mode and dielectric 3a.

3b comes into play effectively. However, at the same time, a higher-order mode as shown in FIG. 4 also exists at almost the same frequency as the above-mentioned fundamental mode, so there is a drawback that it is difficult to put it into practical use.

If we call this kind of configuration a dual mode resonator,
A configuration like the present invention is called a triple mode resonator.

In this triple mode resonator, the electric lines of force in the higher mode run not only in the X-axis and Y-axis directions but also in the Z-axis direction, so the frequency is considerably lower than that of the fundamental mode and can be ignored in practical use. A triple mode resonator is advantageous in this respect.

Now, when a product is manufactured by implementing the present invention, the electromagnetic fields of the three TM++o modes may interfere with each other due to processing technology. In this case, take measures as shown in FIG. That is, in FIG. 5, the TM+I O in which the columnar dielectrics 2a and 2b are involved, respectively
In order to prevent the electromagnetic fields of the modes from interfering with each other, coupling adjustment members 4a and 5a consisting of a pair of screw-shaped metal bodies are placed on the ridge of the case 1 in a plane that includes these columnar bodies 2a and 2b. It is preferable to make them protrude into the case from 6a and 1a. TM11 in which the columnar dielectrics 2a and 2b are involved, respectively.
When discussing the combination of o-modes, consider odd modes and even modes as shown in FIGS. 6 and 1. What is shown is the distribution of electric lines of force. The average value of the electromagnetic energy currently stored in the resonant system is Wt, and the magnetic energy contained in the minute part where the metal is inserted is Δ.
WI11, if ΔWe is the electrical energy contained in the minute part into which metal is inserted, ΔωΔWIIl −ΔW
e ωoQ-t. As can be seen from this perturbation equation, inserting a metal in an area with a strong magnetic field will increase the frequency, and inserting a metal in an area with a strong electric field will decrease the frequency. Therefore, when considering the correct mode shown in FIG. 6, the connection adjustment member 4a
Nearby, magnetic energy is stronger than N air energy,
In the vicinity of the coupling adjustment member 5a, on the contrary, the electric energy is stronger than the magnetic energy. Therefore, the connection adjustment member 4
When the degree of insertion of coupling adjustment member 5a is increased, the resonance frequency of odd mode increases, and when the degree of insertion of coupling adjustment member 5a is increased, the resonance frequency of odd mode decreases. Further, regarding the even mode shown in FIG. 7, contrary to the case of the odd mode, the electric energy is stronger than the magnetic energy near the coupling adjustment member 4a, and the magnetic energy is stronger than the electric energy near the coupling adjustment member 5a. . Therefore, when the degree of insertion of the coupling adjustment member 4a is increased, the resonance frequency of the even mode decreases, and when the degree of insertion of the connection adjustment member 5a is increased, the resonance frequency of the even mode is increased. Therefore, when the resonance frequency of the odd mode and the resonance frequency of the open mode are made equal by moving the coupling adjustment members 4a and 5a in and out, the coupling becomes substantially zero. In order to prevent the N magnetic fields of the TM110 mode involving the columnar dielectrics 2b and 20 from interfering with each other, these columnar dielectrics ii! ! Connection adjustment members 4b and 5b similar to the connection adjustment members 4a and 5a are included in the plane that includes both the electric bodies 2b and 2c.
It is preferable that the ridges 6b and 7b of the case 1 protrude into the case. Furthermore, the columnar dielectrics 2C and 28 are each
In order to prevent the electromagnetic fields of the TM110 modes involved from interfering with each other, the coupling adjustment member 4a is placed within a plane that includes these columnar dielectrics 2C12a.

Connection adjustment members 4c, 5 similar to 5a, 4b, 5b
c may be made to protrude into the case from the ridges 6c, 7c of the case 1.

The point is to consider the aforementioned odd mode and even mode and place the coupling adjustment member at a position that will affect them. Therefore, they do not necessarily have to be a pair. The coupling adjustment member may be a dielectric material coated with a metal film.

If the three modes are prevented from interfering with each other in this way, three electrically orthogonal resonators are accommodated in one case.

Now, such a resonator is put into practical use by being provided with means for coupling with an external circuit.

As shown in FIGS. 8(A) to 8(C), the columnar dielectric 2
axial direction of a, axial direction of columnar dielectric 2b, columnar dielectric 2C
When the axial directions of the roof 8C are aligned with the X-wheel, Y-axis, and Z-axis of the orthogonal coordinate system, the roof 8C is located near one end of the columnar dielectric 2b with a gap in the X-axis direction from the surface of the columnar dielectric 2b. Deploy. At this time, the plane including the loop 8C is made perpendicular to the X axis. One end of the loop 8C is connected, for example, to the center conductor of the coaxial connector 10G, and the other end is grounded. An input signal applied to the input coaxial connector 10c causes a current to flow through the loop 8C, and the direction of the generated lines of magnetic force and the lines of magnetic force M in the resonance mode involving the columnar dielectric 2a are determined.
When observing the direction of Fs, the direction of the magnetic field line MF2 in the resonance mode involving the columnar dielectric 2b, and the direction of the magnetic field line MF3 in the resonance mode involving the columnar y:N body 2C, it is found that the ones that have the same direction component and are coupled are There is only magnetic field line MF3. Therefore, if a frequency component of a resonance mode involving the columnar dielectric 2C is present in the signal applied to the input coaxial connector 10C, a resonance phenomenon occurs.

Similar coupling means are provided for the columnar dielectric 2b. The loop 8b is arranged near one end of the columnar dielectric 2a with a gap in the Z-axis direction from the surface of the columnar dielectric 2a. At this time, the plane including the loop 8b is made perpendicular to the Z axis. One end of the loop 8b is connected, for example, to the center conductor of the coaxial connector 10b, and the other end is grounded. An input signal applied to the input coaxial connector 10b causes a current to flow through the loop 8b, and the direction of the generated magnetic field lines and
Direction of magnetic field line MF1 in resonance mode involving columnar dielectric 2a, magnetic field line M in resonance mode involving columnar dielectric 2b
When the direction of F2 and the direction of the magnetic field line MF3 in the resonance mode involving the columnar dielectric 2C are observed, only the magnetic field line MF2 has a component in the same direction and is coupled.

Therefore, if a frequency component of a resonance mode involving the columnar dielectric 2b is present in the signal applied to the input coaxial connector 10b, a resonance phenomenon occurs.

Furthermore, similar means are provided for the columnar dielectric 2a. The loop 8a is arranged near one end of the columnar dielectric 2C with a gap in the Y-axis direction from the surface of the columnar dielectric 20. At this time, the plane including the loop 8a is made perpendicular to the Y axis. One end of loop 8a. For example, it is connected to the center conductor of the coaxial connector 10a, and the other end is grounded. An input signal applied to the input coaxial connector 10a causes a current to flow through the loop 8a, and the direction of the generated lines of magnetic force and the lines of magnetic force MF1 in the resonance mode involving the columnar dielectric 2a are determined.
, the direction of the magnetic force line MF2 in the resonance mode involving the columnar dielectric 2b, and the direction of the magnetic force line MF3 in the resonance mode involving the columnar dielectric 2C, it is found that only the magnetic force line MF1 has the same direction component and is coupled. It is. Therefore, if a frequency component of a resonance mode involving the columnar dielectric 2a is present in the signal applied to the input coaxial connector 10a, a resonance phenomenon occurs.

Then, the loop is placed at a position where it is coupled to any of the lines of magnetic force MF1 in the coexistence mode involving the columnar dielectric 2a, the lines MF2 in the resonance mode involving the columnar dielectric 2b, and the lines MF3 in the resonance mode involving the columnar dielectric 2c. 12a,
12b and 12c are placed. In the eighth illustrated example, the loops 12a, 12b, and 12c are arranged near the corner 14 where the three ridges of the case 1 meet, and the plane in which the loop 12a is included is located at an arbitrary first point including the corner 14 and the center of the case.
The plane containing the loop 12b intersects this first plane at an intersection angle of 120'', and the intersection axis passes through the corner 14 and the center of the case, forming a second plane, which includes the loop 12c. The plane intersects the first and second planes at an angle of 12
0'', and the axis of intersection is a third plane passing through the corner 14 and the center of the case.

One end of each loop 12a, 12b, 12c is connected together to the center conductor of the coaxial connector 16, and each loop 1
The other ends of 2a112b and 12c are grounded. All of the magnetic lines of force MF1, MF2, and MF3 interlink with the loop 12a, and the loop 12b1 and the loop 12C also have the magnetic force 1.
1MFt, MF2, and MF3 are all interlinked. Corner 14
Loop 12a, 1 at the center of the axis passing through the center of the case and the center of the case.
Rotating 2b and 12C changes the output characteristics.

In this way, coaxial connectors 10a 110b 11
The signals added to 0c will be output from the coaxial connector 16. These loops 8a to 8c,
The shapes of 12a to 12c are not limited to those illustrated, and may be ring-shaped, for example.

If the device of this embodiment is represented as a lumped constant circuit, it can be considered as shown in FIG. 9(A) or FIG. 9(B). It is currently unknown which one is more faithful to the actual three-dimensional circuit. In the figure, R1 is a resonator related to a resonance mode involving the columnar dielectric 2a, R2 is a resonator related to a resonance mode involving the columnar dielectric 2b, and R3 is a resonator related to a resonance mode involving the columnar dielectric 2C. be.

The resonant frequencies of each resonator match t! Sometimes it is different, sometimes it is different.

Although the embodiment has been described assuming a channel filter or a power combiner, this device can also be used as a duplexer.

(Effect Song) As is clear from the above embodiments, the present invention effectively utilizes the three mutually orthogonal TMlt o modes existing in the rectangular parallelepiped cavity shield case or their modified modes, so the cost is reduced to 1/3 of the conventional It is an epoch-making product that can be downsized to a size as low as 1 in cost. Since the power distribution or combiner rR section is also present within the case, the product of the present invention is considerably smaller than the conventional example.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main part of an embodiment of this invention, FIGS. 2 to 4 are explanatory diagrams explaining dual mode resonance, and FIG. 5 is a perspective view showing the main part of an embodiment of this invention. Figures 6 and 7 are explanatory diagrams for explaining the invention in detail, and Figures 8 (A>, (
B), (C) are internal explanatory diagrams of the embodiment of this invention, FIGS. 9(A) and (B) are equivalent circuit diagrams of the real/11@ of this invention,
FIG. 10 shows a conventional example. 1 is a shield case, 2 is a composite dielectric, 8a, 8b. 8c112 is a magnetic coupling loop. Patent application: Murata Manufacturing Co., Ltd. Engraving of the drawing (no changes to the content) 'li2 Figure-? , l ′lI 6 mouth 2b! 7 Figure b 118 times CB) Y Real 8th grade (C) Blind, 9 Figure (A) R. (Procedural amendment writing method) September 1985
Patent Application No. 119492 2, name of the invention Dielectric resonator device 3, relationship with the person making the amendment Patent applicant address 2-26-10 Tenjin, Nagaokakyo City, Kyoto Prefecture 1985
August 27, 2017 (shipment date) 5. Application subject to amendment, specification and drawings 6. Contents of amendment

Claims (1)

[Claims] (1) A dielectric characterized by utilizing three TM_1_1_0 modes or their deformation mode resonance obtained by arranging three columnar dielectrics integrated in a rectangular parallelepiped cavity shielding case so as to be perpendicular to each other. A dielectric resonator device comprising: a body resonator; and external coupling means for coupling the resonator with an external circuit, wherein the external coupling means includes a first external coupling means for coupling to the first resonator, a first external coupling means for coupling to the first resonator; a second external coupling means for coupling to the second resonator;
a third external coupling means for coupling to the third resonator;
, and fourth external coupling means coupled to the second and third resonators.