JPH0362701A - Dielectric resonator - Google Patents

Abstract

PURPOSE:To attain high Q and low loss for a dielectric resonator and to make the size small by supporting a ceramic resonator in a hollow part of a dielectric substance made of an ethylene tetrafluoride resin whose dielectric constant is 2.1 or below or between the two dielectric materials. CONSTITUTION:An ethylene tetrafluoride resin (PTFE) 20 is adhered between two parallel metallic plates 10a, 10b and an elliptic hollow part 30 is made to the ethylene tetrafluoride resin 20. Porous materials 40a, 40b are provided to the inner wall of the hollow part 30 and a cylindrical ceramic resonator 50 is provided between the porous materials 40a, 40b. Coaxial antennas 1a, 1b as center conductors are placed to the hollow part 30. Metallic plates 10a, 10b form upper and lower reflecting layers for a resonance radio wave and act like grounding the radio wave. The porous materials 40a, 40b act like cushion layers absorbing mechanical vibration and air enters freely to the cushion layer, then excellent electric characteristic is attained (high Q).

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a dielectric resonator.

[Prior Art] Recently, dielectric resonators have been widely used as devices that handle microwave bands become smaller. This dielectric resonator is
It is mainly used as a frequency stabilizing resonant element in local oscillation circuits, and cylindrical resonator types and four-wave tube types are known.

[Problems to be Solved by the Invention] Incidentally, there is a demand for a dielectric resonator with high Q, low loss, and further miniaturization, but the conventional dielectric resonators described above cannot be miniaturized while maintaining their performance. The problem is that there are limits to what can be done, and it is not possible to meet those demands.

The present invention provides an aA that is smaller and lighter than conventional dielectric resonators.
The objective is to provide an 'ilj body resonator.

[Means for Solving the Problems] The present invention provides a hollow portion of a dielectric material having a dielectric constant of 2.1 or less, or
A ceramic resonator is held between the two dielectrics.

[Function] The present invention is directed to a hollow part of a dielectric material having a dielectric constant of 2.1 or less,
Since the ceramic resonator is held between the two dielectrics, the dielectric resonator has a high Q, low loss, and can be made smaller.

[Example] FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

In this embodiment, a tetrafluoroethylene resin (PTFE) 20 is bonded between two parallel metal plates 10a and 10b, and an oval hollow portion 30 is provided in the tetrafluoroethylene resin 20. .

Porous materials 40a and 40b are provided on the inner wall of the hollow portion 30, and a cylindrical ceramic resonator 50 is provided between these porous materials 40a and 40b. As the porous materials 40a and 40b, porous PTFE (E-PT
FE) is preferred.

Note that the metal plate 10a, the tetrafluoroethylene resin 20, the porous material 40a, the ceramic resonator 50, and the porous material 40
b. Tetrafluoroethylene resin (registered trademark) 20. The metal plates 10b are bonded to each other with a Teflon adhesive. Note that if the loss is not a big problem, an epoxy adhesive may be used instead of the Teflon adhesive.

In the hollow part 30, a coaxial antenna 1a as a center conductor,
1b is installed.

The metal plates 10a and 10b form a reflection layer for the upper and lower resonant radio waves, and are used to ground the radio waves.

The porous materials 40a, 40b serve as a cushion layer that absorbs mechanical vibrations, and air can freely enter this cushion layer, resulting in excellent electrical properties (high Q).

Figure 2 shows the tetrafluoroethylene resin 2 in the above example.
FIG.

By adopting the above configuration, a high Q is achieved, loss is small, and the entire resonator becomes lightweight and compact. Its shape is
This is approximately 172 to 1/3 that of a conventional dielectric resonator. Also,
” 2, the tetrabutylene ethylene resin is molded in one piece,
If the ceramic resonator 50 is installed in the hollow portion 30, there will be less error in the mounting position of the ceramic resonator 50.

Note that although the hollow portion 30 has an oval shape, it may have other shapes such as a rectangle.

FIG. 3 is a longitudinal sectional view of another embodiment of the invention.

In this embodiment, two tetrabutylene ethylene resins 21a and 21b are bonded to the inner wall of the metal plate 11 with adhesive,
Porous materials 41a and 41b are sunk into the opposing surfaces of the tetrafluoroethylene resins 21a and 21b, and these porous materials 4
A cylindrical ceramic resonator 51 is installed between 1a and 41b. Coaxial antennas 2a and 2b are attached to the hollow portion 31 within the metal plate 11.

-1- The reporter component is adhered to the press with a Teflon-based adhesive, and if its loss is not a major problem, it may be adhered with an epoxy-based adhesive.

FIG. 4 is a perspective view of the tetrafluoroethylene resins 21a and 71b in the embodiment shown in FIG.

In the embodiment shown in Fig. 3.4, the tetrafluoroethylene resins 21a and 21b are provided in parallel, and for example, four squares are placed vertically at the right end of the two tetrafluoroethylene resins 21a and 21b. It is also possible to provide a ethylene resin and configure the ethylene resin in a so-called U-shape. Alternatively, another tetrafluoroethylene resin may be provided at the left end of the U-shaped tetrafluoroethylene resin, so that the tetrafluoroethylene resin is shaped like a frame.

Furthermore, porous materials 40a, 40b, 41a.

41b, a tetrafluoroethylene resin may be used.

Alternatively, the porous materials 40a and 40b may be omitted from the embodiment shown in FIG. 1, and the ceramic resonator 50 may be bonded to the inner surface of the tetrafluoroethylene resin 20. in this case,
The height of the hollow part 30 is made almost the same as that of the ceramic resonator 50. Similar to the above, from the embodiment of FIG.
1a and 41b may be deleted, and the ceramic resonator 51 may be bonded to the opposing surfaces of the tetrabutylene ethylene resins 21a and 21b. In this case, although the electrical characteristics (Q) are somewhat degraded, the overall shape of the resonator can be made smaller than that of a conventional dielectric resonator.

Further, in the above embodiment, the tetrafluoroethylene resin 20.
21a, 21b have a dielectric constant of 2.1-2.044', and porous materials 40a, 40b, 41a, 41b have a dielectric constant of 1.3 or more. Therefore, in the embodiment L, the cylindrical ceramic resonator 50 or 51 has a dielectric constant of 2.
It is held with a dielectric material of 1 or less.

Note that instead of the tetrafluoroethylene resins 20.21a and 21b, a dielectric material formed by mixing 30% by weight or less of hollow glass bulbs into the tetrafluoroethylene resin may be used. The dielectric constant of the dielectric material molded in this way is 1.8 to 1.7.

[Effects of the Invention] According to the present invention, the dielectric resonator has a high Q, a low loss, and can be further miniaturized.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention. FIG. 2 is a perspective view of the tetrafluoroethylene resin 20 in Example 2. FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention. FIG. 4 is a perspective view of the tetrafluoroethylene resins 21a and 21b in the embodiment shown in FIG. 10a, 10b, 11..., metal plate, 20.2
1a, 21b...4 fluorinated ethylene resin, 30, 1...hollow part, 40a, 40b, 41a, 1b...porous material, 0 1... ...Resonator.

Claims (3)

[Claims] (1) A dielectric resonator characterized in that a ceramic resonator is held in a hollow part of a dielectric having a dielectric constant of 2.1 or less or between two dielectrics. (2) A dielectric resonator according to claim (1), characterized in that a porous material is provided between the dielectric material having a dielectric constant of 2.1 or less and the ceramic resonator. (3) In claim (1), the dielectric having a dielectric constant of 2.1 or less is a tetrafluoroethylene resin or a dielectric formed by mixing 30% by weight or less of hollow glass bubbles in a tetrafluoroethylene resin. A dielectric resonator characterized by being a body.