JPH0327602A - Input/output coupling circuit for dielectric resonator - Google Patents

Abstract

PURPOSE:To obtain an input output coupling circuit for a dielectric resonator with simple structure and high reliability by removing an earth conductor of an open face at both ends of the dielectric resonator and between center conductors of an input output microstrip line. CONSTITUTION:A conductor film is formed on the surface of a dielectric material, a hole is made in the inside in the axial direction, a conductor film is formed to a part of the hole with respect to a half wavelength to form the dielectric resonator 1 with a half wavelength. Both ends of the resonator 1 are formed as open faces for a strong electric field and an earth conductor 4 on the dielectric base 2 under the both ends is removed. Thus, the ends at both sides of the resonator 1 and the center conductors 31, 32 of a microstrip line on a face opposite to the resonator 1 are coupled directly by an electric field. As a result, the connection circuit with simple structure and high reliability is constituted.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a coupling circuit between a three-dimensional dielectric resonator circuit and an input/output circuit composed of a microstrip line planar circuit, and which has a simple structure and high reliability. A dielectric resonator that resonates at a predetermined frequency, a dielectric substrate that mounts the dielectric resonator on a ground conductor surface, and a ground conductor surface of the dielectric substrate, the purpose of which is to provide an input/output coupling circuit for the resonator. In order to directly couple the center conductor of the microstrip line for input/output formed on the opposite side of the dielectric resonator to the input/output part of the dielectric resonator and the center conductor of the microstrip line for input/output using an electric field, A ground conductor is provided by removing the conductor between the body resonator and the center conductor of the input/output microstrip line.

[Industrial application field]

The present invention relates to a coupling circuit between a three-dimensional dielectric resonator circuit and an input/output circuit configured with a microstrip line planar circuit.

Dielectric filters such as semi-coaxial resonators and combline filters are small in size, simple in structure, and provide a high no-load Q, so they are widely used in microwave circuits.

However, a dielectric resonator is a three-dimensional circuit, and the input/output circuit is generally a planar circuit using a microstrip line, and a connection circuit with a simple structure and high reliability is required to connect the three-dimensional circuit and the planar circuit. has been done.

[Conventional technology] FIG. 5 shows a diagram illustrating a conventional example.

The conventional example shown in FIG. 5 includes a dielectric resonator IA, conductors 51 and 52 that are coupled by electric field to the input and output oven surfaces 11 and 12 of the dielectric resonator IA, a dielectric substrate 2, and a dielectric substrate 2. This is an example in which the center conductor 31, 32 of the input/output microstrip line formed above and the input/output coaxial parts 61, 62 connecting the conductors 51, 52 and the microstrip line center conductor 31, 32 are constructed. .

Here, the microwave input from the microstrip line 31 is connected to the conductor 51 through the input/output coaxial section 6l. The conductor 51 is coupled to the open surface 11 of the dielectric resonator IA by an electric field.

The dielectric resonator IA resonates at a resonant frequency determined by its physical dimensions, and the oven surface 12 on the output side of the dielectric resonator IA is coupled to the conductor 52, via the input/output coaxial section 62,
The signal is output to the microstrip line 32, and serves as a bandpass filter.

[Problem to be solved by the invention]

In the conventional example described above, the input/output coaxial section 61 is used to connect the conductors 51, 52 and the microstrip lines 31, 32.
, 62 are used.

Such a dielectric resonator IA is used in the microwave band, the frequency is high, and the dielectric resonator IA has a physically fine structure.

Therefore, the input/output coaxial parts 61, 62 connected to this
It also has a complex and detailed structure.

An object of the present invention is to provide a dielectric resonator input/output coupling circuit that has a simple structure and high reliability.

[Means to solve the problem]

FIG. 1 shows a diagram illustrating the principle of the invention.

In the principle diagram shown in FIG. 1, l is a dielectric resonator, 2 is a dielectric substrate, and 31 and 32 are center conductors of an input/output microstrip line that is coupled to the dielectric resonator 1. , 4 is a ground conductor formed on a dielectric substrate, the dielectric resonator 1 is mounted on the ground surface of the dielectric substrate 2,
The center conductors 3l and 32 of the microstrip line are formed on the surface of the dielectric substrate 2 opposite to the ground surface. In this structure, the open surfaces at both ends of the dielectric resonator l and the center conductor 31 of the input/output microstrip line
, 32, the open surfaces at both ends of the dielectric resonator 1 and the center conductors 3l, 32 of the input/output microstrip line are directly coupled by an electric field.

Providing such a means is a means for solving this problem.

[For production]

A conductive film is formed on the surface of the dielectric material, a hole is made in the axial direction, a conductive film is also formed in the part corresponding to the half wavelength inside the hole, and a half wavelength dielectric resonator 1 is formed. make.

Both ends of this dielectric resonator l are oven surfaces. The ground conductor 4 on the dielectric substrate 2 below both ends of the dielectric resonator 1 is removed, and the microstrips on both ends of the dielectric resonator 1 and the surface opposite to the dielectric resonator 1 are removed. By directly coupling with the center conductors 31 and 32 of the line using an electric field, it becomes possible to construct a connection circuit with a simple structure and high reliability.

[Example] The gist of the present invention will be specifically explained below with reference to Examples shown in FIGS. 2 to 4.

Figure 2 is a diagram illustrating the coupling between the dielectric resonator of the present invention and the center conductor of the microstrip line by an electric field;
The figures are diagrams for explaining an embodiment of the present invention, and FIG. 4 is a diagram for explaining another embodiment of the present invention. Note that the same reference numerals refer to the same objects throughout the plan.

FIG. 2 is a diagram explaining the coupling by electric field of the present invention,
Both ends of the dielectric resonator l are open surfaces with a strong electric field, and by removing the ground conductor 4 below the open surfaces, the microstrip line formed on the opposite surface of the dielectric substrate 2 can be This shows a situation in which the central conductors 31 and 32 are directly coupled by an electric field.

Note that the degree of coupling is determined by the area and shape of the ground conductor 4 to be removed.

Figure 3 shows an example of a three-stage bandpass filter using such a coupling circuit. The dielectric resonator 1B is a 4/λ resonator, and each resonator is coupled by an electromagnetic field. death,
The open surfaces of the resonators at both ends connect the center conductors 31, 3 of the microstrip line on the back side of the dielectric substrate 2.
2 and is coupled by an electric field.

FIG. 4 shows an example of a two-stage band rejection filter, in which each resonator IC is coupled to the center conductor 3 of the microstrip line on the back surface of the dielectric substrate 2 at the oven surface by an electric field.

By taking the above precautions, it is possible to realize a dielectric resonator input/output connection circuit with a simple structure and high reliability. [Effects of the Invention] According to the present invention as described above, it is possible to provide an input/output connection circuit for a dielectric resonator that can easily connect the dielectric resonator to the center conductor of a microstrip line. Can be done. 61 and 62 indicate input and output coaxial parts, respectively.

[Brief explanation of drawings]

Figure 1 is a diagram explaining the principle of the present invention, Figure 2 is a diagram explaining the coupling by electric field between the dielectric resonator of the present invention and the center conductor of the microstrip line, and Figure 3 is an example of the present invention. 4 is a diagram illustrating another embodiment of the present invention, and FIG. 5 is a diagram illustrating a conventional example. In the figure, 1, IA, IB, and IC are dielectric resonators, 2 is a dielectric substrate, 3, 31, and 32 are center conductors of the microstrip line, 4 is a ground conductor, 51, 52 are conductors, and Koro Hon's # The ability of figure immortal Akira to entrust the truth is also an example 1 the other day 1 ru 58 sugar 3 Amoto Moe 5 days 6 Lisa's Ariyu's real person [9+1 xe. ．． The pure combination Σ due to the electric field and the 4th mouth is also complete, and the column that is t is also clear.

Claims (1)

[Claims] A circuit for coupling a dielectric resonator (1) and a central conductor (31, 32) of a microstrip line for input/output, the dielectric resonator (1) resonating at a predetermined frequency. ), a dielectric substrate (2) on which the dielectric resonator (1) is mounted on the surface of the ground conductor (4), and a surface of the dielectric substrate (2) opposite to the surface of the ground conductor (4). The center conductors (31, 32) of the formed input/output microstrip line and the dielectric resonator (1)
) and the center conductor (31, 32) of the microstrip line for input/output using the dielectric resonator (1) and the center conductor of the microstrip line for input/output (31, 32). An input/output coupling circuit for a dielectric resonator, comprising a ground conductor (4) with a conductor portion between the conductors (31, 32) removed.