JPH07120889B2 - Dielectric coaxial resonator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric coaxial resonator of a filter or a resonator used for communication information equipment of high frequency, mainly 0.3 to 3 GHz.

2. Description of the Related Art As shown in FIG. 5, a conventional λ / 4 dielectric coaxial resonator for varying a resonance frequency includes a spring terminal 17, a dielectric rotor 18, and a λ / 4 type coaxial resonator (hereinafter referred to as a resonator body). Say)
24 and a shaft 27, and the shaft 27 penetrates the through hole from one end surface 25 on the terminal side of the resonator body 24,
The dielectric rotor (18) is rotatably scissored on the open end surface (23) of the resonator body (24) by the spring terminal (17) and the scissor part (26) of the shaft (27). The dielectric rotor 18 has a rotor electrode 19 and a rotor back electrode 30 which is electrically connected to the rotor front electrode 19 through a rotor through hole 20 as shown in FIG.
It is pressure-contacted to the inner peripheral electrode 21 on the open end face 23 of the resonator body 24 of FIG. Further, the shaft 27 has a driver groove 28. By rotating the shaft 27, the dielectric rotor 19 rotates, and a variable capacitance is formed between the rotor front electrode 19 and the outer peripheral electrode 22. Since the rotor front electrode 19 is electrically connected to the inner peripheral electrode 21 at the open end, the inner peripheral electrode
The capacitance between the outer peripheral electrode 22 and the outer electrode 22 is changed, and the resonance frequency of the resonator body 24 is changed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In a conventional λ / 4 type dielectric coaxial resonator having a variable resonance frequency, a rotor surface electrode 19 of a dielectric rotor 18 and a resonator body are provided.
Capacitance is formed between the outer peripheral electrodes 22 of 24 through the dielectric rotor 18, so that the rotor front and back electrodes 1 are used as the dielectric rotor 18.
There was a problem that it had to provide 9,30 and had a complicated structure.

Means for Solving the Problems In order to solve the above problems, the present invention connects to an outer peripheral surface, an inner peripheral surface and one end surface of a cylindrical dielectric having an axial through hole in a central portion. A λ / 4 type coaxial resonator is provided by providing a conductor part that is provided, and an arc-shaped non-conductor part where a conductor is not provided is provided on an end face conductor part of the λ / 4 type coaxial resonator,
In addition, a rotor made of a non-circular metal capable of adjusting the inductance component is rotatably provided by short-circuiting the non-conductor portion by pressing and rotating the end-face conductor portion.

Action According to the present invention, the rotor presses the end face conductor portion and rotates to short-circuit the non-conductor portion to adjust the inductance component. The accuracy of the contacting portion is easy to obtain, the rotor structure can be constituted by a simple non-circular metal plate, and the structure is simple, so that a λ / 4 type dielectric resonator capable of varying the resonance frequency can be easily provided.

Embodiment FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

In the figure, an outer peripheral surface conductor portion 4, an inner peripheral surface conductor portion 5, an end surface conductor portion 6, and the like, which are connected to each other, are provided on an outer peripheral surface, an inner peripheral surface, and one end surface of a cylindrical dielectric body 3 having a through hole 2. The inner peripheral electrode 7 that is short-circuited with the inner peripheral conductor portion 5 is provided on the end face, and the arc-shaped non-conductor portion 6a where no conductor is provided is further provided on the end conductor portion 6, so that the resonator body 1 is configured. ing.
In addition, a non-circular rotor 10 is attached to one end of the resonator body 1.
, And a shaft 9 made of metal having a scissor portion 11 that is scissored to the spring terminal 8 at the other end is inserted into the through hole 2 from the end surface conductor portion 6 side, and the scissor portion 11 protruding to the open side end surface is formed. The rotor 10 is attached to the resonator body 1 by being scissored by the spring terminal 8.

FIG. 2 is a view of the resonator body 1 viewed from the rotor arrangement side,
The end face conductor portion 6 is provided with an arc-shaped non-conductor portion 6a having no conductor.

3 is a view of the λ / 4 type dielectric coaxial resonator as seen from the rotor side, and 12 is a driver groove for adjustment.

In such a configuration, by rotating the shaft 9, the rotor 10 rotates, the non-conductor portion 6a is short-circuited by the rotor 10, and the resonance frequency changes in proportion to the area of the short-circuited portion.

In this embodiment, the shaft 9 is made of metal, but the rotor is
By making 10 and shaft 9 different, shaft 9
Can be made of materials other than metal.

FIG. 4 is a diagram showing an equivalent circuit of the λ / 4 type dielectric resonator of the present invention. 13 is a capacitance component of the resonator, 14 is the same inductance component, and 15 is a variable inductance component obtained by rotation of the rotor 10.

As described above, according to the present invention, the accuracy of the contact portion between the rotor and the end surface conductor portion can be easily obtained, and the structure of the rotor can be a simple non-circular metal plate and simple, and the resonance frequency can be easily achieved. It is possible to provide a λ / 4 type dielectric resonator in which

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a dielectric coaxial resonator according to an embodiment of the present invention, FIG. 2 is a perspective view of the resonator main body seen from the rotor side, and FIG. 3 is the same resonator. 4 is a plan view showing a rotating portion of the rotor of FIG. 4, FIG. 4 is an equivalent circuit diagram of the resonator, FIG. 5 is an exploded perspective view of a conventional dielectric resonator, and FIG. 6 is a perspective view of a rotor portion of the resonator. Is. 1 ... Resonator body, 2 ... Through hole, 3 ... Dielectric material, 4 ...
... outer peripheral surface conductor section, 5 ... inner peripheral surface conductor section, 6 ... end surface conductor section, 6a ... non-conductor section, 10 ... rotor.

Claims (1)

[Claims] 1. A λ / 4-type dielectric coaxial resonator in which a conductor portion connected to each other is provided on an outer peripheral surface, an inner peripheral surface, and one end surface of a cylindrical dielectric body having a through hole in an axial direction at a central portion. The λ / 4 type dielectric coaxial resonator is provided with a non-conductor part in which no conductor part is provided in the end face conductor part in an arc shape, and is pressed against the end face conductor part to rotate about the through hole. A dielectric coaxial resonator in which a rotor made of a non-circular metal capable of adjusting the inductance component by short-circuiting the non-conductor portion is rotatably provided.