Resonant cavity

Abstract

Provided is a resonant cavity, including a cavity body, at least two metamaterial plates located inside the cavity body, each metamaterial plate including at least one metamaterial sheet, the cavity body being further installed thereon with an adjustment device for adjusting the relative position between the at least two metamaterial plates. The present invention realizes the purpose of frequency reduction by way of placing a metamaterial plate in a resonant cavity and using the high refractive index property of metamaterial, and further realizes trimming of the resonant frequency under the condition of reduced frequency by providing an adjustment device for the metamaterial plate to make the relative position between each metamaterial plate adjustable, which can meet more accurate filtering demands. In addition, also provided is a filter having said resonant cavity.

Description

technical field

[0001] The invention relates to the field of electromagnetic communication, more specifically, to a resonant cavity. Background technique

[0002] In microwave devices, cavity filters are very important devices. The cavity filter is composed of several microwave resonant cavities, and each resonant cavity has a cavity surrounded by conductive walls (or magnetic conductive walls) of any shape. Generally, a resonant cavity has a fixed resonant frequency, and generally the smaller the volume of the resonant cavity, the higher the resonant frequency. Therefore, some resonant cavities with low resonant frequency have relatively large volume.

[0003] In order to adjust the resonant cavity with a known frequency point, a tuning screw is usually arranged on the top of the cavity, and the frequency point of the resonant cavity is adjusted by adjusting the depth of its extension into the resonant cavity. However, this adjustment method is usually accompanied by an ...

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