Resonance cavity and tuning method of resonance cavity

Abstract

The invention relates to a resonance cavity which comprises a cavity body, a harmonic oscillator arranged in the center of the cavity body, an input end, an output end and two tuning rods. The input end and the output end are oppositely arranged at two side walls of the cavity body respectively. The tuning rods are oppositely arranged on the other two side walls of the cavity body respectively. Each L-shaped tuning rod comprises a horizontal segment and a vertical segment, wherein the horizontal segment is vertical to the side walls of the cavity body and extends into the cavity body and the vertical segment is arranged in the cavity body and vertically connected at the tail end of the horizontal segment. The invention further relates to a method for tuning the resonance cavity. By arranging the L-shaped tuning rods on the cavity body, the tuning rods and the cavity body form a ring shape so as to form a magnetic field vertical to the plane of the ring shape and exert perturbation on an electromagnetic field and especially the magnetic field in the resonance cavity. Thus, a resonance frequency of the resonance cavity is influenced. With the tuning method, the positions of the tuning rods in the cavity body when the objective resonance frequency is to be reached can be directly obtained, blindly moving the tuning rods is not needed, operation is simple, working efficiency is high and labor and time can be saved.

Description

technical field [0001] The present invention relates to the field of radio frequency devices, and more particularly, to a resonant cavity and a tuning method thereof. Background technique [0002] In microwave radio frequency devices, the cavity filter is a very important device. The cavity filter is composed of several microwave resonant cavities. The commonly used resonant cavity has a cavity surrounded by conductive walls (or magnetic conductive walls) of any shape, and also includes a cavity cover on the cavity and a cavity installed in the cavity. Input and output terminals on the side walls on both sides of the body. Usually, a resonant cavity has a fixed resonant frequency, and generally the smaller the resonant cavity volume, the higher the resonant frequency. Therefore, some resonant cavities with low resonant frequencies are relatively large in size. [0003] In order to adjust a resonant cavity with a known frequency point, a tuning screw is usually arranged on...

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Problems solved by technology

However, this adjustment method is usually accompanied by an increase in loss

In addition, for the cavity filter of the TM mode, since the height of the medium in the cavity is similar to that of the cavity, the tuning screw cannot extend into the cavity, and cannot achieve an effective frequency reduction effect.

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