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Semi-coaxial cavity resonator, filter using the same, and communication apparatus using the same

A coaxial cavity and resonator technology, applied in resonators, waveguide devices, circuits, etc., can solve the problems of increased manufacturing costs, weight, and temperature waveform confusion, and achieve the effect of increased length

Inactive Publication Date: 2007-05-16
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when a filter is made by combining a dielectric resonator and a semi-coaxial cavity resonator, the frequency change of the dielectric resonator due to temperature changes is small, so if the frequency change of the semi-coaxial cavity resonator If it is not lowered, the temperature change will cause the waveform to be confused
Although the semi-coaxial cavity resonator made of invar material can make the filter hardly change in frequency with the change of temperature, its manufacturing cost and weight will increase.

Method used

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  • Semi-coaxial cavity resonator, filter using the same, and communication apparatus using the same
  • Semi-coaxial cavity resonator, filter using the same, and communication apparatus using the same
  • Semi-coaxial cavity resonator, filter using the same, and communication apparatus using the same

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Embodiment Construction

[0071] first embodiment

[0072] Fig. 3 has shown the cross-section of the internal conductor fixed part according to the first embodiment of the present invention, is a semi-coaxial cavity resonator in the filter shown in Fig. 4 and is cut along the partial cross-sectional view of A-A;

[0073] First, Fig. 4 will be described. FIG. 4(a) is a plan view of a bandpass filter using both a semi-coaxial cavity resonator and a dielectric resonator, showing the internal structure of the filter after part of the upper conductor plate 21 is removed. FIG. 4( b ) is a side view of FIG. 4( a ), showing the internal structure of the filter after part of the outer conductor 3 is removed.

[0074] The outer conductor 3 is a cavity structure with cavities with openings on one side, and each cavity is separated by a partition plate. The inner conductor 1 is fixed on the bottom surface 3 a of the outer conductor 3 by means of bolts 2 . This will be described in detail in Figure 3. But the i...

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Abstract

A cavity reentrant cylindrical resonator formed by threading an inner conductor to an outer conductor, wherein an area allowing a screw (2) to deform therein is formed by forming, in a female screw hole inside the inner conductor (1), an internal cavity (5) not threaded with the screw (2) from the seat surface (4) of the inner conductor. Accordingly, the perpendicularity of the screw (2) to the seat surface (4) and the deviation of the perpendicularity of the female screw hole inside the inner conductor (1) can be absorbed by the deformation of the screw (2) to uniformly and securely bring the seat surface (4) of the inner conductor into contact with the bottom face (3a) of the outer conductor (3). As a result, the occurrence of an intermodulation distortion can be suppressed.

Description

Technical field: [0001] The present invention relates to a semi-coaxial cavity resonator, and a filter and communication equipment using the semi-coaxial cavity resonator. Background technique: [0002] At present, the semi-coaxial cavity resonator used by people has a shell, and the outer conductor and the inner conductor in the shell are formed as a whole with aluminum or aluminum alloy. This semi-coaxial cavity resonator is also used in filters superior. The conductor can be formed by cutting or die casting, and a panel with adjusting bolts is bolted to it to form a closed space inside, so that it can be used as a resonator or filter. The material of the resonator and filter is not limited to aluminum or aluminum alloy, especially when it is formed by mechanical cutting, other different materials can be used, such as: invar, copper, copper alloy or iron, etc. Usually, When using these materials, surface treatment such as electroplating is carried out after processing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P7/04H01P1/205H01P1/202
CPCH01P1/2053H01P7/04
Inventor 久保浩行中江广和
Owner MURATA MFG CO LTD
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