JPH08222918A - Dielectric resonator - Google Patents

Abstract

PURPOSE: To adjust a coupling coefficient and to suppress dispersion in the characteristic by providing a female screw to either of the dielectric resonator and a support base and providing a male screw to the other respectively and screw-fitting the screws so as to change a position relation between the dielectric resonator and a coupling body. CONSTITUTION: A female screw 11 is formed in the dielectric resonator 1 and a male screw 21 is formed in a support base 2 respectively and the resonator 1 is screw-fitted to the support base 2. Thus, the position relation of a transmission line 3 being a coupling body and the resonator 1 is changed by a screw motion of the resonator 1 with respect to the support base 2 to change the coupling coefficient between the resonator 1 and the transmission line 3. Thus, a desired coupling coefficient is obtained by turning the resonator 1 and fixing the resonator at a prescribed position and the resonator with less characteristic dispersion is easily obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator device provided with a dielectric resonator in which a TE01δ mode electromagnetic field is distributed.

[0002]

2. Description of the Related Art A dielectric resonator device provided with a TE01δ mode dielectric resonator has been conventionally used, for example, as a local oscillator of a down converter in a receiver for satellite broadcasting or satellite communication. FIG. 13 shows the structure of the dielectric resonator device. In FIG. 13, 1 is a cylindrical or cylindrical dielectric resonator, 2 is a cylindrical or cylindrical support base, 3 is a transmission line, and these are arranged in a metal case 6 in a predetermined positional relationship. . A screw hole is formed in the upper part of the metal case 6 in FIG.
Are screwed together. In the dielectric resonator device having such a configuration, the TE01δ mode electromagnetic field is distributed in the dielectric resonator 1, and the dielectric resonator 1 and the transmission line 3 are magnetically coupled.

[0003]

In the dielectric resonator device shown in FIG. 13, the coupling coefficient and resonance frequency between the dielectric resonator 1 and the transmission line 3 are determined by the relative permittivity (ε) of the dielectric resonator 1. _rR ), the relative permittivity (ε _rS ) of the support base 2, the size of the dielectric resonator 1, the size of the support base 2, the support position of the dielectric resonator 1 and other parameters. Since the parameters always vary, the coupling coefficient between the dielectric resonator 1 and the transmission line 3 and the resonance frequency also vary.

Regarding the above-mentioned coupling coefficient, there has been no way to adjust it in the past, which has been a cause of characteristic variations. The resonance frequency is adjusted by projecting the metal screw 7 shown in FIG. 13 into the metal case 6 and changing the resonance space. However, no load Q ( Qo) was decreasing.

An object of the present invention is to provide a dielectric resonator device capable of adjusting a coupling coefficient between a coupling body such as a transmission line and a dielectric resonator and suppressing characteristic variations.

Another object of the present invention is no-load Q (Qo).
Another object of the present invention is to provide a dielectric resonator device capable of adjusting the resonance frequency without reducing the frequency.

[0007]

The dielectric resonator device of the present invention enables adjustment of the coupling coefficient between the dielectric resonator and the coupling body, and therefore the dielectric resonator according to claim 1. And a female screw part on one side of the support base, and a male screw part on the other side, respectively, and the female screw part and the male screw part are screwed together, and the dielectric resonator and the coupling body are formed by rotation of the dielectric resonator with respect to the support base. The position relationship of can be changed.

Further, the dielectric resonator device of the present invention enables adjustment of the resonance frequency as well as adjustment of the coupling coefficient between the dielectric resonator and the coupling body, and yet does not lower the no-load Q (Qo). According to claim 2, a female screw portion is provided on the dielectric resonator, and a male screw portion is provided on the support base.
The female screw portion of the dielectric resonator is screwed onto the male screw portion of the support, and the adjusting dielectric having the male screw portion formed on the outer peripheral surface is screwed onto the female screw portion of the dielectric resonator.

Also, the dielectric resonator device of the present invention enables adjustment of the resonance frequency as well as adjustment of the coupling coefficient between the dielectric resonator and the coupling body, and yet does not reduce the no-load Q (Qo). According to claim 3, a female screw portion is provided on the dielectric resonator, and a male screw portion is provided on the support base.
The female screw portion of the dielectric resonator is screwed onto the male screw portion of the support base, and the adjusting dielectric having the female screw portion formed on the inner surface is screwed onto the male screw portion of the support base.

Similarly, the dielectric resonator device of the present invention is
The support base is cylindrical as described in claim 4, so that the resonance frequency can be adjusted together with the adjustment of the coupling coefficient between the dielectric resonator and the coupling body, and the unloaded Q (Qo) is not lowered. A female screw portion on the inner surface and a male screw portion on the outer peripheral surface, respectively.The female resonator portion is provided on the dielectric resonator, and the female screw portion of the dielectric resonator is screwed onto the male screw portion of the support base. The adjusting dielectric having a male screw portion formed on its surface is screwed into the female screw portion of the support.

Further, the dielectric resonator device of the present invention is
In order to facilitate the adjustment of the coupling coefficient between the dielectric resonator and the coupling body, as described in claim 5, the female screw portion or the male screw portion of the dielectric resonator is provided at an eccentric position.

[0012]

1 and 2 show examples of the construction of the dielectric resonator device according to the first aspect of the present invention. In the example of FIG. 1, the dielectric resonator 1 is provided with a female screw part and the support base 2 is provided with a male screw part, respectively, and the dielectric resonator 1 is screwed into the support base 2. Therefore, the rotation of the dielectric resonator 1 with respect to the support 2 changes the positional relationship (height h) between the dielectric resonator 1 and the transmission line 3 as a coupling body, and the dielectric resonator 1 and the transmission line 3 are changed. The coupling coefficient with changes. Therefore, the desired coupling coefficient can be obtained by rotating the dielectric resonator 1 and fixing it at a predetermined position.

In the example of FIG. 2, the dielectric resonator 1 is provided with a male screw portion 11 and the support base 2 is provided with a female screw portion 21, respectively, and the dielectric resonator 1 is screwed onto the support base 2. Therefore, the rotation of the dielectric resonator 1 with respect to the support 2 changes the positional relationship (height h) between the dielectric resonator 1 and the transmission line 3 as a coupling body, and the dielectric resonator 1 and the transmission line 3 are changed. The coupling coefficient with changes. Therefore, the desired coupling coefficient can be obtained by rotating the dielectric resonator 1 and fixing it at a predetermined position.

FIG. 3 shows a structural example of the dielectric resonator device according to the second aspect of the present invention. In this example, the dielectric resonator 1
A female screw portion 11 is provided on the support base 2, a male screw portion 21 is provided on the support base 2, and the female screw portion 11 of the dielectric resonator 1 is screwed onto the male screw portion 21 of the support base 2. Also, on the outer peripheral surface, the male screw portion 41
The adjusting dielectric 4 formed with is screwed into the female screw portion 11 of the dielectric resonator 1. With this configuration, the height h of the dielectric resonator 1 changes due to the rotation of the dielectric resonator 1,
The coupling coefficient between the transmission line 3 as a coupling body and the dielectric resonator 1 changes. Further, the rotation of the adjusting dielectric 4 with respect to the dielectric resonator 1 changes the amount of the adjusting dielectric 4 inserted into the dielectric resonator 1 to change the effective permittivity of the dielectric resonator 1. The resonance frequency changes. Since the adjusting dielectric 4 is a dielectric, no conductor loss occurs,
The no-load Q (Qo) of the resonator is hardly reduced by providing the adjusting dielectric 4.

FIG. 4 shows a structural example of a dielectric resonator device according to a third aspect of the present invention. In this example, the dielectric resonator 1
The female screw portion of the dielectric resonator 1 is screwed to the male screw portion 21 of the support base 2. Further, the adjusting dielectric body 4 having the female screw portion formed on the inner surface is screwed into the male screw portion 21 of the support base 2.
With this configuration, the rotation of the dielectric resonator 1 changes the height of the dielectric resonator 1 and changes the coupling coefficient between the transmission line 3 as the coupling body and the dielectric resonator 1. Further, the rotation of the adjustment dielectric 4 changes the distance between the dielectric resonator 1 and the adjustment dielectric 4, changes the effective permittivity of the dielectric resonator 1, and changes the resonance frequency. Since the adjustment dielectric 4 is a dielectric, no conductor loss occurs, and the unloaded Q of the resonator due to the provision of the adjustment dielectric 4
Almost no decrease in (Qo).

FIG. 5 shows a structural example of a dielectric resonator device according to a fourth aspect of the present invention. In this example, a female screw portion 22 is provided on the inner surface of the cylindrical support 2 and a male screw portion 21 is provided on the outer peripheral surface thereof, and the female screw portion of the dielectric resonator 1 is screwed onto the male screw portion 21 of the support 2. . Further, the adjusting dielectric 4 having the male screw portion 41 formed on the outer peripheral surface is screwed into the female screw portion 22 of the support base 2. With this configuration, the dielectric resonator 1
Rotation changes the height of the dielectric resonator 1 and changes the coupling coefficient between the transmission line 3 as a coupling body and the dielectric resonator 1. Further, due to the rotation of the adjusting dielectric 4, the amount of the adjusting dielectric 4 inserted into the dielectric resonator 1 changes, the effective dielectric constant of the dielectric resonator 1 changes, and the resonance frequency changes. Since the adjusting dielectric 4 is a dielectric, no conductor loss occurs, and the unloaded Q (Qo) of the resonator is hardly reduced by providing the adjusting dielectric 4.

Next, FIG. 6 shows a structural example of a dielectric resonator device according to a fifth aspect of the present invention. FIG. 6A is a vertical sectional view, and FIGS. 6B and 6C are top views. In this example, a female screw portion is formed at a position eccentric from the center of the dielectric resonator 1 and is screwed into a male screw portion of the support base 2. With this configuration, the rotation of the dielectric resonator 1 changes the height h with the transmission line 3 as the coupling body as shown in (A), and the dielectric hose as shown in (B) and (C). The lateral distance between the body resonator 1 and the transmission line 3 also changes. By moving the dielectric resonator 1 in the height direction and the lateral direction,
The coupling coefficient between the transmission line 3 and the dielectric resonator 1 can be adjusted.

[0018]

FIG. 7 is a vertical sectional view showing the structure of a dielectric resonator device according to a first embodiment of the present invention. In FIG. 7, reference numeral 5 is a circuit board, and the transmission line 3 is formed together with the ground conductor 51 on the upper surface of the base 50 of the circuit board.
The ground conductor 52 is formed on substantially the entire back surface of the 0. As a result, the transmission line 3 constitutes a strip line. The support base 2 is entirely made of a cylindrical ceramic having a low dielectric constant, and a male screw portion 21 is formed on the outer peripheral surface thereof. The support base 2 has a circuit formed by forming a solderable film such as a silver electrode on the bottom surface of the support base 2 and soldering it to the ground conductor 51 on the circuit board side or by adhering it with an epoxy adhesive or the like. It is fixed to the substrate 5. The dielectric resonator 1 is entirely made of a cylindrical dielectric ceramic, and has an internal thread portion 11 provided therein. Female screw part 1 of this dielectric resonator 1
1 and the male screw portion 21 of the support base 2 are formed by threading after molding, or by forming a screw portion in advance during molding and then sintering. In the figure, 6 is a metal case having a bottomed cylindrical shape, and the flange portion 61 is fixed to the circuit board 5 by soldering or screwing it to the ground conductor 51 of the circuit board 5.

In the dielectric resonator device shown in FIG. 7,
When adjusting the coupling coefficient between the dielectric resonator 1 and the transmission line 3, the adjustment is performed by rotating the dielectric resonator 1. However, the adjustment is performed before the metal cover 6 is covered and the metal cover is removed or the metal is removed. The characteristic is measured with the case 6 covered, and the rotation amount of the dielectric resonator 1 is adjusted until a predetermined coupling coefficient is obtained.

Next, FIG. 8 is a longitudinal sectional view showing the structure of a dielectric resonator device according to a second embodiment of the present invention. Figure 7
Unlike the first embodiment shown in FIG. 1, the dielectric resonator 1 is integrally provided with a male screw portion 11 projecting to the lower portion thereof, and the support base 2 is provided.
A female screw portion 21 is provided on the above, and both are screwed together. Since other configurations are similar to those in the case of FIG. 7, the same parts are denoted by the same reference numerals and the description thereof will be omitted.

Next, FIG. 9 is a vertical sectional view showing the structure of a dielectric resonator device according to a third embodiment of the present invention. Figure 7
Different from the first embodiment shown in FIG.
The adjusting dielectric 4 formed with is screwed into the female screw portion 11 of the dielectric resonator 1. Further, an adjustment hole 62 is provided in the upper part of the metal cover 6. Other configurations are the same as those in the case of FIG. 7, and the same parts are denoted by the same reference numerals. In the third embodiment, a predetermined jig for rotating the dielectric resonator 1 is inserted through the adjusting hole 62 provided in the upper portion of the metal case 6, and the dielectric resonator 1 is rotated to rotate the dielectric resonator 1. Resonator 1
By adjusting the distance between the transmission line 3 and the transmission line 3, by adjusting the coupling coefficient, by adjusting the position in the height direction of the dielectric resonator 1 in the resonance space formed by the metal case 6 and the circuit board 5. At the same time, the resonance frequency is roughly adjusted. Further, the adjusting driver is inserted from the adjusting hole 62 provided in the upper part of the metal case 6, and is engaged with the driver groove 42 provided in the upper part of the adjusting dielectric 4 to rotate the adjusting dielectric 4. By doing so, the resonance frequency is finely adjusted.

Next, the construction of a dielectric resonator device according to a fourth embodiment of the present invention is shown in FIG. 10 as a longitudinal sectional view. Unlike the first embodiment shown in FIG. 7, the adjusting dielectric body 4 having the female screw portion formed on the inner surface is screwed to the male screw portion 21 of the support base 2. Other configurations are the same as in the case of FIG.
In the fourth embodiment, the coupling coefficient is adjusted by rotating the dielectric resonator 1 to adjust the distance between the dielectric resonator 1 and the transmission line 3 before covering with the metal case 6. By adjusting the position of the dielectric resonator 1 in the height direction within the resonance space formed by the metal case 6 and the circuit board 5, the resonance frequency is roughly adjusted at the same time. Further, the resonance frequency is finely adjusted by rotating the adjustment dielectric 4.

FIG. 11 is a vertical sectional view showing the structure of the dielectric resonator device according to the fifth embodiment of the present invention. Unlike the third embodiment shown in FIG. 9, a female thread portion 22 is provided on the inner surface of the cylindrical support base 2 and a male thread portion 21 is provided on the outer peripheral surface thereof, and the dielectric resonator 1 is attached to the male thread portion 21 of the support base 2. The adjustment dielectric 4 having the male screw portion 41 formed on the outer peripheral surface is screwed to the female screw portion 22 of the support base 2 while being screwed. Other configurations are the same as in the case of FIG. This fifth
In the embodiment, the adjustment hole 6 provided on the upper part of the metal case 6
By inserting a predetermined jig for rotating the dielectric resonator 1 from 2 and rotating the dielectric resonator 1 to adjust the distance between the dielectric resonator 1 and the transmission line 3, the coupling coefficient is changed. By adjusting and adjusting the position of the dielectric resonator 1 in the height direction in the resonance space formed by the metal case 6 and the circuit board 5, the resonance frequency is roughly adjusted at the same time. Further, the adjusting driver is inserted from the adjusting hole 62 provided in the upper part of the metal case 6, and is engaged with the driver groove 42 provided in the upper part of the adjusting dielectric 4 to rotate the adjusting dielectric 4. By doing so, the resonance frequency is finely adjusted.

FIG. 12 is a vertical sectional view showing the structure of the dielectric resonator device according to the sixth embodiment of the present invention. Unlike the first embodiment shown in FIG. 7, the dielectric resonator 1 has a female screw portion formed at a position eccentric from its central axis,
It is screwed onto the male screw portion of the support base 2. Other configurations are the same as in the case of FIG. In the seventh embodiment, by rotating the dielectric resonator 1, the height and the lateral distance of the dielectric resonator 1 with respect to the transmission line 3 are adjusted, whereby the dielectric resonator 1 and the transmission line 3 are separated from each other. The resonance frequency is adjusted by adjusting the coupling coefficient and the height of the dielectric resonator 1.

In the second to fifth embodiments shown in FIGS. 8 to 11, the dielectric resonator 1 is provided with the female screw portion or the male screw portion at the center thereof. A female screw part or a male screw part may be provided at a position eccentric from the center of the body resonator.

In each of the above embodiments, the dielectric resonator is directly mounted on the circuit board via the support, and the transmission line on the circuit board and the dielectric resonator are magnetically coupled to each other. Although shown, in a single dielectric resonator device in which a dielectric resonator is provided in a ceramic cavity or a metal cavity in which a conductor film is formed, and a coupling body such as a coupling loop or a probe is provided in the cavity, The present invention can be similarly applied.

[0027]

According to the dielectric resonator device of the first aspect of the present invention, the coupling coefficient between the dielectric resonator and the coupling body can be adjusted by rotating the dielectric resonator with respect to the support. Therefore, it is possible to easily obtain the dielectric resonator device with less characteristic variation.

According to the dielectric resonator device of the second to fourth aspects of the present invention, the resonance frequency can be adjusted together with the adjustment of the coupling coefficient between the dielectric resonator and the coupling body, and no load is applied. It does not lower Q (Qo).

According to the dielectric resonator device of the fifth aspect of the present invention, the coupling coefficient between the dielectric resonator and the coupling body can be changed relatively greatly by a small amount of rotation of the dielectric resonator. Adjustment of the coupling coefficient becomes easy.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a dielectric resonator device according to claim 1 of the present invention.

FIG. 2 is a diagram showing a configuration example of a dielectric resonator device according to claim 1 of the present invention.

FIG. 3 is a diagram showing a configuration example of a dielectric resonator device according to claim 2 of the present invention.

FIG. 4 is a diagram showing a configuration example of a dielectric resonator device according to claim 3 of the present invention.

FIG. 5 is a diagram showing a configuration example of a dielectric resonator device according to claim 4 of the present invention.

6A and 6B are diagrams showing a configuration example of a dielectric resonator device according to claim 5 of the present invention, wherein FIG. 6A is a longitudinal sectional view, and FIGS. 6B and 6C are top views.

FIG. 7 is a vertical sectional view showing the structure of the dielectric resonator device according to the first embodiment of the present invention.

FIG. 8 is a vertical sectional view showing the structure of a dielectric resonator device according to a second embodiment of the present invention.

FIG. 9 is a vertical sectional view showing the structure of a dielectric resonator device according to a third embodiment of the present invention.

FIG. 10 is a longitudinal sectional view showing the structure of a dielectric resonator device according to a fourth embodiment of the present invention.

FIG. 11 is a vertical sectional view showing the structure of a dielectric resonator device according to a fifth embodiment of the present invention.

FIG. 12 is a vertical sectional view showing the structure of a dielectric resonator device according to a sixth embodiment of the present invention.

FIG. 13 is a diagram showing a configuration of a conventional dielectric resonator device.

[Explanation of symbols]

 1-Dielectric resonator 2-Support base 3-Transmission line (combined body) 4-Adjustment dielectric 5-Circuit board 6-Metal case 7-Metal screw

Claims (5)

[Claims] 1. A dielectric resonator comprising a dielectric resonator in which a TE01δ mode electromagnetic field is distributed, a support for supporting the dielectric resonator, and a coupling body for magnetic field coupling or electric field coupling with the dielectric resonator. In the device, one of the dielectric resonator and the support base is provided with a female screw part and the other is provided with a male screw part, and the female screw part and the male screw part are screwed together, and the dielectric resonator is rotated by rotation of the support base. A dielectric resonator device characterized in that a coupling coefficient between the dielectric resonator and the coupling body can be adjusted by changing a positional relationship between the body resonator and the coupling body. 2. A female screw portion is provided on the dielectric resonator, a male screw portion is provided on the support, the female screw portion of the dielectric resonator is screwed onto the male screw portion of the support base, and the male screw is provided on the outer peripheral surface. 2. The dielectric resonator device according to claim 1, wherein the adjusting dielectric having the section is screwed into a female screw section of the dielectric resonator. 3. A female screw portion is provided on the dielectric resonator, a male screw portion is provided on the support base, the female screw portion of the dielectric resonator is screwed onto the male screw portion of the support base, and the female screw portion is formed on the inner surface. 2. The dielectric resonator device according to claim 1, wherein the adjusting dielectric having the structure formed therein is screwed onto the male screw portion of the support base. 4. The support base has a cylindrical shape, an internal thread portion is provided on an inner surface and a male thread portion is provided on an outer peripheral surface, a female thread portion is provided on the dielectric resonator, and the dielectric resonator is provided on a male thread portion of the support base. 2. The dielectric resonator device according to claim 1, wherein said female screw portion is screwed and said adjusting dielectric having a male screw portion formed on the outer peripheral surface is screwed to said female screw portion of said support base. 5. The dielectric resonator device according to claim 1, wherein the female screw portion or the male screw portion of the dielectric resonator is provided at an eccentric position.