A Miniaturized Waveguide Filter Based on Evanescent Modes

Abstract

The invention discloses a miniaturized waveguide filter based on evanescent mode, which includes a standard rectangular waveguide, an evanescent mode filter channel, two pins for positioning the evanescent mode filter channel, and a pin for fixing the evanescent mode filter channel and the standard rectangular waveguide Four setscrews. The invention adopts the design method of the channel folding of the evanescent mode filter and the realization mode of stacking metal sheets, and realizes the design and miniaturization of the high-order evanescent mode waveguide filter. Its advantages are that it can help the miniaturization, light weight, integration, and low cost of high-frequency microwave communication systems, and its processing cycle is short, and various device sizes can be easily realized by designing different thicknesses of metal sheets.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a miniaturized waveguide filter based on an evanescent mode. Background technique [0002] With the gradual increase of the operating frequency band of the communication system, the link's demand for low-loss waveguide devices is also gradually increasing. As a frequency selective device, filters are also developing towards miniaturization, light weight, and low cost in today's communication systems. Therefore, miniaturized and easy-to-integrate waveguide filters are still hot research in academia and industry object. [0003] In order to reduce the size of the waveguide filter, Xu Li disclosed a miniaturized waveguide filter with multiple branch coupling (Xu Li, Wang Qingyuan, a miniaturized waveguide filter, Chinese invention patent, application number 201810570576, application date 2018.06. 05), the miniaturization of the overall filter is realized by connecting multi-level ...

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Problems solved by technology

However, the size of this structure is severely limited by the outermost recessed structure. At the same time, as the operating frequency increases, the processing and nesting of the recessed structure will be difficult to achieve, and the coupling of input and output will also be difficult to meet the requirements of waveguide cascading in communication systems.

In order to reduce the size of the resonant unit and optimize the coupling structure, et al. disclosed a waveguide filter based on evanescent modes (Corona-Chavez, A., et al. (2011). "Novel microwave filters based on Epsilon Near Zero waveguide tunnels. "Microwave and Optical Technology Letters 53(8):1706-1710.), through the characteristics of the evanescent mode, the filter coupling window of this structure can be folded, but the overall size is limited by the half-wavelength resonant unit, and at the same time, because it cannot be realized Cross-coupling between resonators, relatively poor out-of-band rejection

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