JPS58108802A - Dielectric-loaded coaxial resonator - Google Patents

Abstract

PURPOSE:To improve variance in resonance frequency, oscillation resistance, and mass-productivity by fixedly inserting a dielectric material into part of a coaxial resonator structure. CONSTITUTION:Conductor metallic films 4 and 5 are provided to the outside of a dielectric material 3 and the inside where a center conductor 2 is inserted; and the dielectric material is inserted fixedly in contact with the internal wall of the external conductor 1 and the center conductor 2. In this case, creamy solder 6, etc. is inserted between said metallic films 4 and 5 of the dielectric material 3, and the internal wall of the external conductor 1 and the external wall of the center conductor 2 to fix both tightly, obtaining performance which is very stable electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dielectric-mounted quantum-axis resonator, in which a dielectric material is inserted and fixed in a part of the coaxial resonator structure to improve variation in resonance frequency and improve vibration resistance. The aim is to improve productivity and mass productivity.

When constructing a coaxial resonator using a dielectric material with a high permittivity and low loss in order to downsize it, conventionally, the entire dielectric material has a half wavelength of the resonant frequency. Alternatively, a method has been adopted in which the length is one-fourth of a wavelength. In addition, when using a hollow coaxial resonator and installing a dielectric material in a part of it, if the dielectric material is inserted into a cylindrical coaxial shape, for example, the material is processed to the required dimensions and the coaxial The central conductor and outer conductor were mounted in such a way that they were in close contact with the metal walls. This method requires high machining accuracy of the material and requires special fixing against vibrations, etc., resulting in poor productivity.

FIG. 1 is a diagram showing a cross section of a conventional dielectric-mounted quantitative axis resonator. In the figure, a dielectric material 3 is inserted into a coaxial resonator consisting of a center conductor 2 and an outer conductor 1 to reduce the size. In this case, the dielectric material 3 was simply processed to a predetermined size and mounted without providing any external conductor coating or the like. For this reason, a gap is likely to be formed between the external conductor 1 and the dielectric 3, which often has an unstable effect on the electrical characteristics, and is not suitable for mass production.

The present invention eliminates these drawbacks and realizes a dielectric-mounted quantitative axis resonator that is highly suitable for mass production.

FIG. 2 shows a dielectric-mounted quantitative axis resonator according to an embodiment of the present invention, and parts having the same functions as those in FIG. Conductor metal coatings 4 and 6 are provided on the outside of the dielectric material 3 and on the inside where the center conductor 2 is inserted, respectively, and are inserted and fixed so as to be in close contact with the inner wall of the outer conductor 1 and the center conductor 2, respectively. For example, a cream-like solder 6 or the like is inserted between the conductive metal coatings 4 and 6 provided on the outer and inner peripheral surfaces of the body material 3 and the inner wall of the outer conductor 1 and the outer wall of the center conductor 2. This allows both to be firmly fixed, and extremely stable electrical performance can be obtained.

FIG. 3 shows another embodiment of the present invention, in which the dielectric material 3 mounted on the center conductor 2 of the coaxial resonator is connected to the outer conductor 1 of the resonator.
It is constructed by having a part of it protrude beyond the end face of the
In this case as well, conductive metal coatings 4 and 5 are provided on the inner and outer circumferential surfaces of the dielectric material 3, as in the embodiment shown in FIG. With this configuration, the conductive metal coating 4 provided on the outside has a portion thereof in close contact with the outer conductor 1, and thus acts as a part of the outer conductor of the coaxial resonator. In this case, at least the inner wall of the external conductor 1 and the conductive metal coating 4 provided around the outer periphery of the dielectric material 3 can be bonded and fixed with, for example, cream solder or conductive paste 6. In this embodiment, the center conductor 2 and the conductor metal coating 5
The conductive paste between is omitted.

In the case of this embodiment as well, variations in the electrical resonance frequency are reduced, and the effect is excellent in mass production.

In this embodiment, the outer diameter of the center conductor 2 is changed in the middle, but it goes without saying that the center conductor 2 may have a uniform outer diameter.

As described above, when mounting a dielectric material on a part of a coaxial resonator, particularly a resonator using a TEM tate, the present invention provides a conductive metal coating on the portion where the dielectric material contacts the center conductor and the outer conductor. In addition, the conductor film, the center, and the outer conductor are fixed with a fluid conductive material.
Moreover, it has the advantage of being resistant to vibration and being suitable for mass production.

[Brief explanation of the drawing]

FIG. 1 fa) is a vertical cross-sectional view of a conventional dielectric-mounted quantity-axis resonator, fbl is a cross-sectional view taken along the line AA' (at), and FIG. 2 fa and FIG. A cross-sectional view showing an example of a mounted quantitative axis resonator is a cross-sectional view taken along line A-A' of (at). 1... Outer conductor, 2... Center conductor, 3
... Dielectric material, 4.5 ... Conductor metal coating, 6 ... Creamy solder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (1)

[Claims] (1) Inside the hollow cylindrical external conductor, one end is open and the other end is
providing a short-circuited center conductor, mounting a dielectric material on the open end portion of the region surrounded by the outer conductor and the center conductor, and providing a conductor coating on the portions of the dielectric material that are in contact with the outer conductor and the center conductor, respectively; A dielectric-mounted quantitative axis resonator, characterized in that the conductive film, the external semiconductor, and the center conductor are fixed to each other via a fluid conductive material. (b) The dielectric-mounted quantitative axis resonator according to claim 1, wherein the end face of the center conductor mounted with the dielectric material is configured to protrude from the end face of the outer conductor.