JPH08222917A - Dielectric resonance component - Google Patents

Abstract

PURPOSE: To provide inexpensive and reliable resonance component by making a dielectric resonator section and a support base integrally with the same material and removing part of the support base so as to reduce an effective dielectric constant of the support base. CONSTITUTION: The dielectric resonator component 10 is formed by integrally forming a dielectric resonator section 11 and a support section 12 with the same dielectric material whose specific dielectric constant is nearly 40. The outer diameter of the support base 12 is formed smaller than that of the resonator section 11 and a slit 12a is formed in a radial direction through the center. The component 10 is supported by adhering the support base 12 to a bottom side of a cavity and the resonator section 11 is resonated in the cavity in the TE01δ and acts like a filter or an oscillator. Thus, a job of adhesion or the like to adhere the dielectric resonator and the support base is not required, the manufacture cost is reduced and the characteristic is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonance component used for filters, oscillators and the like.

[0002]

2. Description of the Related Art Recently, in the fields of satellite broadcasting and satellite communication,
A TE _{01 δ} mode dielectric resonator is used as a local oscillator of a down converter that converts a radio signal from a satellite received by a receiving antenna into a low frequency signal. An example of this type of dielectric resonator is shown in FIG.

As shown in FIG. 5, the dielectric resonator 1 is composed of a cylinder or a cylinder (a cylinder in the figure) of a dielectric material having a high dielectric constant (relative permittivity of about 40), and is usually made of epoxy adhesive or the like. It is adhered by a glass or the like to a cylindrical support base 2 made of a low dielectric constant dielectric material, and is supported in a cavity 3 which also serves as a case of a local oscillator of a down converter of a satellite broadcast receiver (not shown), for example. . The cavity 3 is a conductive case in which a conductor is formed on the surface of a cylindrical metal or ceramic whose top and bottom are covered.

The support base 2 includes the dielectric resonator 1 and the cavity 3
In addition to the function of supporting the dielectric resonator 1 in the cavity 3 in the TE _01δ mode, the function of adjusting the coupling between the dielectric resonator 1 and a circuit (not shown) that constitutes the down converter. Also has.

The support base 2 reduces the electric energy stored in the support base 2 when the dielectric resonator 1 is excited,
In order to reduce the conductor loss due to the current flowing through the bottom surface of the cavity 3 and prevent the unloaded Q of the resonator from decreasing, a dielectric material having a low dielectric constant is used, and the outer diameter of the dielectric resonator 1 is cylindrical. Is formed with a smaller outer diameter.

[0006]

However, in the above-mentioned conventional dielectric resonator 1, in order to support the dielectric resonator 1 in the cavity 3, the support base 2 is required as a separate member, and the dielectric resonator 1 is required. There is a problem that the manufacturing cost becomes high because the work such as adhesion and fixing of the support base 2 and the support base 2 is required.

Further, due to the difference in linear expansion coefficient between the dielectric resonator 1 and the support base 2 and the effect of thermal expansion of the adhesive, the temperature characteristics are deteriorated or the adhesive strength is deteriorated, so that the characteristics and reliability are deteriorated. There was a problem.

In order to solve the above problems, a method of integrally forming the dielectric resonator 1 and the support base 2 with the same material has been attempted, but in this case, the support base portion is replaced with a conventional support base. If they are formed in the same shape, the supporting base portion is also made of the same high dielectric constant material as the dielectric resonator portion, so that the electric energy of the supporting base portion also increases, and the bottom surface of the cavity 3 on the side where the supporting base portion is supported. Current concentrates on the
There was a problem that the no-load Q was significantly reduced, and there was a problem that it could not be used in practice.

Therefore, an object of the present invention is to integrally form the dielectric resonator portion and the support base portion with the same material, and delete a part of the support base portion so as to reduce the effective dielectric constant of the support base portion. By doing so, it is to provide an inexpensive and highly reliable dielectric resonance component.

[0010]

In order to achieve the above object, the present invention comprises a dielectric resonator section and a support base section for supporting the dielectric resonator section in a cavity. And the support base part are integrally formed of the same dielectric material, and a part of the support base part is deleted so as to reduce the effective dielectric constant of the support base part. Is.

[0011]

According to the above structure, since the dielectric resonator portion and the support base portion are integrally formed, it is necessary to adhere the dielectric resonator and the support base, which have been conventionally required, for bonding. No work is required, and the coefficient of linear expansion of the dielectric resonator part and the support base part are the same, and the characteristics and reliability are improved. Moreover, since a part of the support base is removed so as to reduce the effective dielectric constant of the support base, the conductor loss in the state of being supported by the cavity can be significantly reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments.

FIG. 1 shows the structure of a dielectric resonant component according to the first embodiment of the present invention. FIG. 1A is an external perspective view with the support base part facing up, and FIG. 1B is XX of FIG. 1A.
It is a line sectional view.

As shown in FIGS. 1 (a) and 1 (b), the dielectric resonator component 10 of this embodiment is a cylindrical dielectric resonator portion 1
1 and a substantially cylindrical support base 12 are integrally formed of the same dielectric material having a relative dielectric constant of about 40. The outer diameter of the support base 12 is formed smaller than the outer diameter of the dielectric resonator portion 11, and the support base 12 is provided with slits 12a extending across both ends in the radial direction. That is, the support base 12
A slit 12a is provided by removing a part of the above, and the support base 12 is formed by being divided into left and right by the slit 12a.

The outer diameter dimension and wall thickness (difference between inner diameter and outer diameter) of the support base 12 are set in consideration of mechanical strength for supporting the dielectric resonant component 10 in the cavity.

This dielectric resonant component 10 is supported by adhering a support base 12 to the bottom surface of a cavity (not shown) and housed in the cavity. The dielectric resonator portion 11 is set in the TE _01δ mode in the cavity. It resonates and is used as a filter or an oscillator.

The slit 12a is provided to reduce the effective permittivity of the support base 12 of the dielectric resonance component 10. That is, in the TE _01δ mode, the electric field runs in the circumferential direction of the dielectric resonance component 10, and the slit 12a is provided in the direction perpendicular to the electric field so as to block the electric field of the support base 12.

The slits 12a are formed at the same time when the dielectric resonance component 10 is molded, or are formed by cutting after molding.

The slits 12a are not limited to those shown in the first embodiment, but may have a cross-shaped cross section as shown in FIG. Well, the shape is not particularly limited.

FIG. 3 shows the structure of the dielectric resonant component according to the second embodiment of the present invention. As shown in FIGS. 3A and 3B, in the dielectric resonant component 10 of this embodiment, the cylindrical dielectric resonator portion 11 and the substantially cylindrical support base 12 are made of the same dielectric material. The groove 12b is formed by integrally molding and removing the outer peripheral surface of the support base 12. The groove 12b is a predetermined portion in the axial direction (vertical direction in the drawing) of the support base 12 and is provided over the entire outer peripheral surface. The side of the support base 12 supported by the cavity (the upper side in the figure) is not removed in order to obtain adhesive (support) strength.

The groove 12b is the slit 12a of the first embodiment.
Similarly to the above, it is provided to reduce the effective dielectric constant of the support base 12, and the axial width and the radial width of the groove 12b are set in consideration of the mechanical strength of the support base 12. It Since the electric field strength becomes stronger as it gets closer to the dielectric resonator portion 11, it is better to place the groove 12b in the axial direction near the dielectric resonator portion 11 because the effective permittivity of the support base portion 12 is lowered. Is more effective. That is, the dielectric resonator section 1
The effective permittivity of the support base 12 can be further reduced by deleting the boundary surface with 1.

FIG. 4 shows the structure of the dielectric resonant component according to the third embodiment of the present invention. The dielectric resonator component 10 of this embodiment has a cylindrical dielectric resonator portion 11 and a substantially cylindrical support base portion 12.
Are integrally formed of the same dielectric material, and as shown in FIG. 4, the support base 12 is provided with a hole 12c having a quadrangular cross-section that penetrates the support base 12 in the radial direction.

The hole 12c is provided to reduce the effective dielectric constant of the support base portion 12, and is shown in FIG. 1 of the first embodiment.
It corresponds to the one in which the upper part of the slit shown in is not deleted. The size of the hole 12c is set in consideration of the mechanical strength of the support base 12. As the hole 12c is formed closer to the dielectric resonator portion 11 in the axial direction, the effective permittivity of the support base 12 can be further lowered.

In this embodiment, a hole having a quadrangular cross section is formed in one hole.
However, the number of holes is not limited to this, and a plurality of holes may be formed, or holes having a circular cross section may be formed. The shape, number, etc. are not particularly limited.

As described in each of the above embodiments, the supporting base 12 is provided with a deletion portion such as a slit, a groove or a hole so as to reduce the effective dielectric constant of the supporting base 12, so that the dielectric is used. Even if the resonator portion 11 and the support base portion 12 are integrally formed of the same material, it is possible to suppress the concentration of current on the bottom surface of the cavity in which the support base portion 12 is supported, and to significantly reduce the conductor loss. .

Further, slits, grooves or holes may be provided in combination, and by forming them in combination, the effective dielectric constant of the support base can be more effectively reduced.

In each of the above-mentioned embodiments, the dielectric resonator portion is described as having a cylindrical shape and the support base portion as having a substantially cylindrical shape. However, the present invention is not limited to this, and the dielectric resonator portion and The shape of the support base may be any of a cylindrical shape and a cylindrical shape, and may be another shape such as a quadrangular cross section.

[0028]

As described above, according to the dielectric resonator component of the present invention, the dielectric resonator portion and the support base portion are integrally formed of the same material, which is conventionally required. The work such as adhesion for joining the dielectric resonator and the support is unnecessary, the manufacturing cost can be reduced, the coefficient of linear expansion of the dielectric resonator and the support is the same, and the characteristics and reliability are improved. can do. Moreover, since a part of the support base is deleted so as to reduce the effective permittivity of the support base, conductor loss in a state of being supported by the cavity can be significantly reduced, and a decrease in the no-load Q can be suppressed. You can

[Brief description of drawings]

1A is an external perspective view of a dielectric resonant component according to a first embodiment of the present invention, and FIG. 1B is a sectional view taken along line XX of FIG.

FIG. 2 is an external perspective view of a dielectric resonant component according to another embodiment of the present invention.

3A is an external perspective view of a dielectric resonant component according to a second embodiment of the present invention, and FIG. 3B is a side sectional view of FIG.

FIG. 4 is an external perspective view of a dielectric resonant component according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state in which a conventional dielectric resonator is supported in a cavity.

[Explanation of symbols]

 10 Dielectric Resonance Component 11 Dielectric Resonator Part 12 Support Base Part 12a Slit 12b Groove 12c Hole

Claims (1)

[Claims] 1. A dielectric resonator section and a support base for supporting the dielectric resonator section in a cavity, wherein the dielectric resonator section and the support base are made of the same dielectric material. And a part of the support base is removed so as to reduce the effective dielectric constant of the support base.