JPS61277204A - Dielectric resonator device - Google Patents

Abstract

PURPOSE:To make a device small-sized and low-cost by allowing the direction of lines of magnetic force generated in a loop to coincide with the direction of lines of magnetic force of a resonance mode to be coupled in an input coupling means and allowing that to interlink to the direction of lines of magnetic force of the resonance mode to be coupled in an output coupling means. CONSTITUTION:Three prismatic dielectrics joined orthogonally to one another into one body are arranged in a rectangular parallelepiped-shaped cavity shield case to use resonances of TM110 modes existing in respective axial directions of prismatic dielectrics or their deformation modes, and the dielectric resonator constituted in this manner and an external circuit are coupled. In the odd mode, the magnetic energy is stronger than the electric energy near a coupling control member 4a, and the electric energy is stronger near a coupling control member 5a. In the even mode, the electric energy is stronger near the coupling control member 4a, and the magnetic energy is stronger near the coupling control member 5a. Consequently, coupling is zero practically if coupling control members 4a and 5a are taken in and out to equalize resonance frequencies in the odd mode and the even mode. Thus, the device is made small-sized and low-cost.

Description

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

(Prior art) As a filter using TM110 mode, Japanese Patent Application Laid-Open No. 53
There is one known in Japanese Patent No.-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 address the everlasting demands of the telecommunications equipment industry for miniaturization and cost reduction.

(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 filter.

(Means for Solving the Problems) The dielectric resonator device of the present invention has three columnar dielectrics integrated in a rectangular parallelepiped hollow shield case so as to be orthogonal to each other. 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 has a magnetic coupling loop, the input coupling means matches the direction of the magnetic force lines generated in the loop with the direction of the magnetic force lines of the resonance mode to be coupled, and the output coupling means It is made to interlink with the magnetic field lines of the resonance mode to be coupled.

(Function) In such a method, a solid dielectric material whose permittivity is overwhelmingly larger than that of air exists in the direction of each line of electric force of the triple degenerate TM110 mode, which is the lowest order resonance mode of the rectangular parallelepiped cavity resonator. This reduces the external dimensions. Further, a necessary mode and an external circuit are coupled by an external coupling means having a simple structure.

(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).
This is a composite dielectric material in which 2a and 2b12c are integrated in a state where they are orthogonal to each other. The composite dielectric shown in the figure is shown in an ideal shape with partial deformation performed by processing technique 1 omitted. The case 1 may be a metal case or, for example, a rectangular parallelepiped cavity made of the same (Zr Sn )Ti 04 ceramic as the composite dielectric 2 and provided with a shield electrode film on the inner or outer surface. 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. Dielectric constant (ε) is 37.5, material temperature coefficient (ηF--α-1/2ηε) is 0±0.51) 111
II/°C.

With this configuration, while inheriting the advantages of conventional filters using TMI 10 mode, such as ■ Obtaining high no-load Q and ■ Compact size, 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 this configuration shown in Figure 2 to Figure 4,
TM11° mode in which electric lines of force run in the axial direction and TM in which electric lines of force run 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 TI'vh to modes may interfere with each other due to processing technology. In this case, take measures as shown in FIG. That is, in Figure 5,
TM1 in which the columnar dielectrics 2a and 2b are now involved, respectively.
In order to prevent the electromagnetic fields of the 10 modes from interfering with each other, coupling adjustment members 4a and 5a consisting of a pair of screw-shaped metal bodies are installed in a plane included in these columnar dielectric bodies 2a and 2b.
is the ridge 6a of case 1.

It is preferable to make it protrude into the case from 7a. Columnar dielectric 2a
, 2b, respectively, consider the odd mode and the even mode as shown in FIGS. 6 and 7. What is shown is the distribution of electric lines of force. Wt is the average value of the electromagnetic energy stored in the resonant system, and ΔWll is the magnetic energy contained in the minute portion into which the metal is inserted. 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. Considering the odd mode shown in FIG. 6, the magnetic energy is stronger than the electrical energy near the coupling A11 member 4a (on the contrary, the electrical energy is stronger than the magnetic energy near the coupling adjustment member 5a. When the degree of insertion of the coupling adjustment member 4a is increased, the resonance frequency of the odd mode increases, and when the degree of insertion of the coupling wR node member 5a is increased, the resonance frequency of the odd mode decreases.Also, regarding the even mode shown in FIG.
Contrary to 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 coupling adjustment member 5a is increased, the resonance frequency of the even mode increases. Therefore, the connection adjustment members 4a, 5a
When the resonant frequency of the odd mode and the even mode are made equal by moving the oscillator in and out, the coupling becomes substantially O. In order to prevent the TM110 mode electromagnetic fields involving the columnar dielectrics 2b and 20 from interfering with each other, a similar coupling adjustment member 4a, 5a is installed in a plane including these columnar dielectrics 2b, 2c. It is preferable that the coupling adjustment members 4b and 5b protrude from the ridge 6b17b of the case 1 into the case. Furthermore, in order to prevent the electromagnetic fields of the TM110 mode involving the columnar dielectrics 2C and 2a from interfering with each other, these columnar dielectrics 20.
A coupling adjustment member 4a is included in a plane that includes both 2a and 2a.

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 affects these modes. 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.

Conversely, if the resonance frequency of the odd mode and the resonance frequency of the even mode are made different by the degree of insertion of each coupling adjustment member,
A coupling corresponding to this difference value is obtained between both modes. Therefore, by combining the three modes, a three-stage filter will be obtained, as will be described later.

Now, such a resonator is put into practical use by being provided with means for coupling with an external circuit. FIGS. 8(A) and 8(B) show the columnar dielectric 2
This figure representatively shows a magnetic coupling loop 8c possessed by the input coupling means and a magnetic coupling loop 9C possessed by the output coupling means, which couple only to the output coupling means.

Now, the axial direction of the columnar dielectric 2a, the axial direction of the columnar dielectric 2b, and the axial direction of the columnar dielectric 2C are respectively expressed as X in the orthogonal coordinate system.
When aligned with the axis, Y axis, and Z axis, loop 8c.

9C is arranged near one end of the columnar dielectric 2b with a gap in the X-axis direction from the surface of the columnar dielectric 2b across the columnar dielectric 2b. At this time, the plane 1 including the loop 8C and the plane including the loop 9C are made to be perpendicular to the X axis. One end of each of the loops 8c, 9c is connected, for example, to the center conductor of a coaxial connector 10c 111c, and the other end of each is grounded. An input signal applied to the input coaxial connector 10C causes a loop 8C1: a current flows, and the direction of the generated magnetic lines of force, the direction of the magnetic lines of force MF1 in the resonance mode involving the columnar dielectric 2a, and the resonance involving the columnar dielectric 2b. When observing the direction of the magnetic field line MF2 of the mode and the direction of the magnetic field line MF3 of the resonance mode involving the columnar dielectric 2C, it is found that the magnetic field line M has the same direction component and is coupled.
Only F3. Therefore, the input coaxial connector 10c
When a frequency component of a resonance mode involving the columnar dielectric 2c is present in the signal applied to the signal, a resonance phenomenon occurs.

Since the magnetic field line MF3 of the resonance mode involving the columnar dielectric 2C interlinks with the loop 9C, the coaxial connector 11C
Output is generated from However, the loop 9C is the columnar dielectric 2
Magnetic field line MF of resonance mode involving a.

, magnetic field lines MF of the resonance mode involving the columnar dielectric 2b
Similar coupling means are provided for the dielectric column 2b, as shown in FIG. 8(C). The magnetic coupling loop included in the input coupling means relating to the columnar dielectric body 2b is indicated by 8b, and the magnetic coupling loop included in the output coupling means is indicated by 9b. The loops 8b and 9b are arranged near one end of the columnar dielectric body 2a with a gap in the Z-axis direction from the surface of the columnar HTR body 2a with the columnar dielectric body 2a in between. At this time, the plane including the loop 8b19b is made perpendicular to the Z axis. Loop 8b, 9b
One end of each is connected, for example, to the center conductor of the coaxial connectors 10b, 11b, 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 lines of force and the columnar dielectric 2a
When observing the direction of the magnetic line of force MF1 in the resonance mode involving the columnar dielectric 2b, the direction of the magnetic line MF2 in the resonance mode involving the columnar dielectric 2b, and the direction of the magnetic line MF3 in the resonance mode involving the columnar dielectric 2C, it is found that they have components in the same direction. Only the magnetic field lines MF2 are 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.

Since the magnetic field line MF2 of the resonance mode involving the columnar dielectric 2b interlinks with the loop 9b, the coaxial connector 11b
Output is generated from However, the loop 9b is connected to the columnar dielectric 2
Magnetic field line MF of resonance mode involving a.

, the magnetic field line MF of the resonance mode involving the columnar dielectric 2C
3, these electromagnetic energies are not extracted from the coaxial connector 11b.

Furthermore, similar means are provided for the columnar dielectric 2a. The magnetic coupling loop possessed by the input coupling means relating to the columnar dielectric body 2a is named 8a, and the magnetic coupling loop possessed by the output coupling means is named 9a. The loops 8a and 9a are 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 with the columnar dielectric 2C in between. At this time, the plane including the loop 8a19a is made perpendicular to the Y axis.

One end of each of the loops 8a and 9a is connected to a coaxial connector 1, for example.
Connect to the center conductors of 0a and 11a, and ground the other ends. 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 MF in the resonance mode involving the columnar dielectric 2a are determined.
1, 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 the magnetic force line MF1 has the same direction component and is coupled. Only. 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 magnetic force 1 in the resonance mode involving the columnar dielectric 2a! Since MF1 and loop 9a are interlinked, an output is generated from coaxial connector 11a. However, since the loop 9a does not interlink with the magnetic force line MF2 in the resonance mode involving the columnar dielectric 2b or the magnetic force line MF3 in the resonance mode involving the columnar dielectric 2C, these electromagnetic energies are not extracted from the coaxial connector 11a. The shapes of these loops 88-80°98-9C are not limited to those shown in the drawings, and may be ring-shaped, for example.

With the above configuration, the dielectric resonator device according to the embodiment of the present invention can be expressed as an equivalent circuit as shown in FIG.

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. , 1.1' are the resonators R
2.2- are the input and output ends of the filter configured with resonator R2, respectively. 3.3- are the input and output ends of the filter configured with resonator R3, respectively. It's the edge. K12 is the degree of coupling between resonators R1 and R2, K23 is the degree of coupling between resonators R2 and R3, K3
1 is the degree of coupling between the resonators R3 and R1. Therefore, by adjusting the coupling adjustment member shown in FIG. 5, if the coupling degree of 12, K23, and K)1 are all made to be substantially 0,
Three resonators that are electrically orthogonal, independent and non-interfering with each other are configured in one case. That is, for example, a signal input to input terminal 1 is filtered and output only from output terminal 1-. The signal input to the input end 2 is filtered and output only from the output end 2-.

A signal input to the input end 3 is filtered and output only from the output end 3'.

Figure 10 shows the filter characteristics, where 811' is the response between input terminal 1 and output terminal 1', 822' is the response between input terminal 2 and output terminal 2-, and 833' is the response between input terminal 3.
, shows the response between the output terminals 3'.

Note that when configuring a filter using three resonators, for example, resonator Rt, resonator R2, and resonator R3 are coupled in this order, and resonator R1 is connected to an input coupling means having a loop 8a. The resonator R3 is combined with an output coupling means such as an output coupling means having a loop 9C. Then, an equivalent circuit as shown in FIG. 11 is obtained. Then, by adjusting the coupling adjustment member provided for each resonator as shown in Fig. 5, the coupling degrees Kf2 and K2O are set to appropriate values, and the KO
2 is set to substantially 0, the signal input to the input coupling means is sequentially filtered by the resonators R1, R2, and R3, and a non-polar filter is configured in one case to be output from the output coupling means. It turns out.

If KO2 is also set to an appropriate value, a polar filter will be constructed.

(Effects) As is clear from the above embodiments, this invention effectively utilizes the three mutually orthogonal TM110 modes existing in the rectangular parallelepiped cavity shield case or its deformation modes, so the size can be reduced to 1/3 of the conventional one. This is an epoch-making device that can be made smaller and reduce costs. Further, the connection with an external circuit is made by an external coupling means having a simple structure.

[Brief explanation of drawings]

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) and (
B) and (C) are internal explanatory diagrams of the embodiment of this invention, FIG. 9 is an equivalent circuit diagram of the embodiment of this invention, FIG. 10 is a filter characteristic diagram of the embodiment of this invention, and FIG. This is an equivalent circuit when a stage filter is configured. 1 is a shield case, 2 is a composite dielectric, 8a, 8b. 8o, 9a, 9b, and 9C are magnetic coupling loops. Patent application Hitoshi Co., Ltd. Village 8] No change in engraving C on side E of the factory) 2c 2b 'iI2 mouth 3n pocket 61 b '17 Fig. 2b iF8 group (°B) '*8 closed (C) 1f 9 feri INPU7 0UTPUT procedure
Amendment (Method) 1, Indication of the case Patent Application No. 119491 of 1985 2, Name of the invention Dielectric resonator device 3, Person making the amendment Relationship to the case Patent applicant address 2 Tenjin, Nagaokakyo City, Kyoto Prefecture Chome 26-10 Showa 60
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. In a dielectric resonator device having a body resonator and an external coupling means for coupling this resonator to an external circuit, the external coupling means has a magnetic coupling loop, and the input coupling means has a A dielectric resonator device characterized in that the direction of the magnetic lines of force is made to match the direction of the magnetic force lines of the resonance mode to be coupled, and the output coupling means is arranged to interlink with the lines of magnetic force of the resonance mode to be coupled. .