JPH06507761A - Coaxial resonator structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] name of invention Coaxial resonator structure Detailed description of the invention The present invention relates to coaxial resonator structures.

High frequency filters are generally realized as coaxial resonators, and the frequency of this filter is The response is determined by the number, size, and mutual coupling of coaxial resonators. normal The solution involves positioning each coaxial resonator in a metal housing that is entirely isolated. It is realized as a conductor rod. Coupling between resonators is, for example, when one resonator conductor wires extending from one housing to another through a coupling opening Provided by a separate coil structure, such as Realized as this kind of resonator The filter structures used are usually complex and large in size. filter Slightly smaller sizes can be achieved by making changes to the structure.

This modification places the resonators in a common metal housing and separates them from each other. The purpose is to separate compartments by intermediate walls. The so-called comb line (C .

mnb-Line) can also be of smaller equal size. child This replaces separate metal housings or compartments separated by intermediate walls. , by positioning the resonator in the same space formed by the housing, the aperture filter It forms the structure. In this aperture filter structure, the resonator has no separation They are directly coupled to each other without using a bonding structure.

A coaxial resonator in a ceramic filter is usually provided in a ceramic body and This is a resonator hole coated with an electrically conductive material. The smallest size is ceramic This is achieved using a filter, where all resonator holes are made of the same ceramic Continuously provided on the main body.

Another common coaxial resonator type is the helical resonator. A helical resonator is a straight conductor. formed by a conductor winding (*ound) instead of a body or a conductor rod. , providing cylindrical coils to achieve smaller sizes.

Reducing the size of various radio devices has always been a goal, and as a result, The demands on the filter sizes used in these radio devices are also greater. It is becoming.

An object of the present invention is to make it possible to provide a filter structure with a smaller size than conventional ones. The purpose of the present invention is to provide a coaxial resonator.

This objective is achieved using a coaxial resonator according to the invention. Coaxial coaxial according to the present invention The resonator structure consists of two or more resonators positioned coaxially inside another resonator. formed by a coaxial resonator. The basic concept of the present invention has been discovered in the past. By positioning another resonator in the empty space inside the coaxial resonator, It is meant to be used. According to the invention, at least one of the conventional resonators is By replacing the resonator structure according to the invention, the filter size is reduced. , the number of resonators in the filter is increased.

Another object of the invention is to form a wave trap using a resonator structure according to the invention. It's about doing. According to the internal resonator of the resonator structure of the present invention, for example, a radio device Attenuate the carrier frequency or its harmonics at the For example, a relatively narrow bandstop circuit or a waveband circuit for the desired Wraps can be easily provided.

Hereinafter, the present invention will be explained in more detail by considering embodiments with reference to the accompanying drawings. Describe. here, FIG. Figure 2 shows a cross-sectional view of a coaxial resonator structure with two coaxial resonators; Another coaxial resonator structure with three coaxial resonators, one inside the other. shows a cross-sectional view, Figure 3 shows two parts formed in a ceramic body, one inside the other. FIG. 4 shows a cross-sectional view of a coaxial resonator structure with a coaxial resonator of Figure 3 shows the frequency response of a bandpass filter with a wrap.

Example As will be apparent from FIG. 1, a cylindrical conductor rod l, preferably made of copper, is The coaxial resonator thus formed is made of electrically conductive material and has all its sides It is positioned in the space 4 formed by the housing 3 in the closed state.

The conductor rod l is fixed at its lower end to the bottom of the 11 housing 3 and One is shorted. The upper end of the conductor rod l is separated from the cover of the housing 3 . Furthermore, the hollow tubular interior space 5 of the conductor rod is formed at the lower end of the conductor rod by l ＼Opens to the outside of the housing through the opening at the bottom of the housing 3. July Season 3 Through the coupling opening 9.10 at the bottom of the housing, the coupling conductor 7.8 is inserted into the interior of the housing. The conductor section inside the housing is connected to the bottom of the housing. It is bent to form a loop. Conductor loop 7.8 is connected to resonator 1 form an inductively coupled coil on both sides of the resonator, connecting the input and output of the resonator. form the power, IN and OUT.

Inside the tubular conductor rod 1, coaxially with it, another coaxial co-lay formed with the conductor 2. The lower end of the coaxial resonator is located at the opening of the conductor port. It extends outside the housing 3 through the lower end of the mouth. Thus, inside one A coaxial resonator structure according to the invention is realized in which the other exists. Internal resonator 2 connecting the lower end of the resonator l to the coupling conductor 9, i.e. to the input or output. narrow bandstop circuit or wave tracker for the desired frequency. the carrier frequency or its harmonics in a radio device, for example. provided to dampen the The frequency of the resonator is determined by the length of each of resonators l and 2. The Q value is determined by the width of the resonator peak, and the width of the resonator peak is determined by the diameter. This allows each resonator to be independently tuned to a different frequency. In this way, Although these resonators 1 and 2 are mechanically integrated, they are electrically Two separate and mutually independent coaxial resonators.

It is also possible to have two or more coaxial resonators inside each other. Figure 2 shows coaxial A side view of the resonator structure is shown, where the coaxial cable is connected to the outermost coaxial resonator. The cylindrical conductor rod of the cable is located coaxially within the tubular conductor rod forming the A shaped outer conductor 2 forms a first inner resonator and a central conductor 1 surrounded by a dielectric 1 2 forms the second internal resonator. Also, one is positioned inside the other. Some resonators, such as can be adjusted.

FIG. 3 is a cross-sectional view of a coaxial resonator structure that may be used in conjunction with a ceramic filter. It is. The outermost coaxial resonator in FIG. 3 is provided in a body 34 made of dielectric material. The electrically conductive coating 31 of the resonator hole 35 is formed by The coating 31 covers substantially the entire dielectric core at the lower end of the hole 35. It is coupled to an electrically conductive coating 33 that covers the body 34. second same A conductor 32 forming an axial resonator is positioned coaxially in the hole 35 .

Furthermore, the internal resonator may be a helical resonator, for example.

One or more resonators of the filter are replaced by coaxial resonators according to the invention. It will be done. The resonator structure according to the invention can be used, for example, for carrier frequency or narrow bandstop filters or waveband filters to attenuate their harmonics. This is particularly useful when the wrap is introduced inside a filter. Figure 4 shows It shows the frequency response of a bandpass filter, and the additional Attenuation can be provided by narrow wave traps. This kind of u The wave trap uses a resonator with an internal resonator/coaxial resonator structure according to the present invention. For example, the circuit shown in Figure 1 can provide can be provided.

The description and drawings herein are intended only to illustrate the invention. . Details of the coaxial resonator structure according to the invention may be specified within the limits specified in the claims. Can be changed.

IG 4 international search report 1sle+*+1iesl ApHleN1w Ho PCT/Fl 921 00153 International Search Report

Claims (1)

[Claims] 1. Two or more coaxial resonances, one coaxially existing inside the other A coaxial resonator structure characterized in that it comprises a resonator (1, 2, 12). 2. A coaxial resonator structure according to claim 1, wherein a conductor forming the second coaxial resonator. (2) or coaxially inside the cylindrical conductor (1) forming the outermost coaxial resonator. Existing coaxial resonator structure. 3. The coaxial resonator structure according to claim 1, wherein the outermost coaxial resonator is made of tubular metal. The tubular metal rod (1) is electrically conductive. a housing made of a magnetic substance and which is earthed at one end to the housing (3); coaxial resonator structure located inside the ring (3). 4. The coaxial resonator structure according to claim 1, wherein the outermost coaxial resonator comprises a dielectric block. shaped by an electrically conductive coating (31) in the hole (35) of the lock (34) and the coating has substantially all conductivity at the other end of the hole. Connect to an electrically conductive coating (33) such as that covering the electrical block (34). Coaxial resonator structure. 5. In the coaxial resonator structure according to claim 1, 2, 3 or 4, the second coaxial resonator structure The conductor forming the vibrator is a tubular conductor (2) and the conductor forming the third coaxial resonator (12) is a coaxial resonator structure located coaxially inside. 6. The coaxial resonator structure according to claim 5, wherein the second coaxial resonator and the third coaxial resonator The axial resonators are each positioned inside the outermost coaxial resonator (1). The same cable formed by the outer conductor (2) and the central conductor (12) of the axial cable Axial resonator structure. 7. In the coaxial resonator structure according to claim 1, the inner coaxial resonator has helical resonance. coaxial resonator structure. 8. The coaxial resonator structure according to any one of claims 1 to 7, wherein the second coaxial resonance One end of the conductor (2) forming the resonator is connected to the output of the outermost coaxial resonator (1) or Coaxial resonator structure tuned to input. 9. The coaxial resonator structure according to any one of claims 1 to 8, wherein the inner coaxial resonance A coaxial resonator structure in which the vessel (2) forms a wave trap. 10. In order to form a wave trap in a high frequency filter, the same according to claim 1 is used. The use of an axial resonator structure.