One-eighth mode substrate integrated waveguide filter with adjustable center frequency and bandwidth

Abstract

The invention relates to a one-eighth mode substrate integrated waveguide filter with fully adjustable center frequency and bandwidth. The EMSIW filter is composed of a single-layer dielectric plate,and the tuning of the center frequency and the bandwidth is realized by loading a varactor diode. By loading stubs on the EMSIW cavity, the resonant frequency can be reduced, and the frequency can betuned by loading varactor diode at the end of stubs, so the frequency tuning mode of the SIW structure can be realized innovatively. Two EMSIW cavities are electrically coupled through an edge gap which provides physical space for the loading element. The coupling coefficient between the two cavities is tuned by loading varactor diodes in the edge gap to realize the bandwidth tuning of the SIW structure. EMSIW is introduced to meet the miniaturization requirements of modern RF communication system and solve the problem that traditional cavity filters are difficult to be tuned by external loading tuning elements.

Description

technical field [0001] The invention belongs to the field of electronic information technology, and specifically relates to a one-eighth mode substrate integrated waveguide (EMSIW) filter with fully adjustable center frequency and bandwidth. Compact RF filter. Background technique [0002] In the era of rapid development of communication technology, the most widely used microwave device in the RF front-end is the filter, which can filter out interference signals outside the frequency band and ensure the performance of the receiver. With the continuous development of the communication industry, the spectrum resources that can be used are becoming more and more scarce, and the available frequency bands are also becoming more and more crowded. This phenomenon just highlights the important role of the filter. Its ability to separate useful signals becomes particularly important in the context of scarce spectrum resources. The performance of the filter directly determines the qu...

AI Technical Summary

Problems solved by technology

At present, whether it is to realize the adjustable center frequency, the bandwidth can be preset, the bandwidth can be reconfigured, the center frequency is fixed, and even the RF filter with dual passband frequency independently adjustable, there have been many research results, but at present, the center frequency and the frequency can be realized at the same time. There are relatively few research results on fully adjustable bandwidth. Fully adjustable center frequency and bandwidth filters can realize "tailor-made" communication services of various standards, which is the ultimate design goal of adjustable filters.

In today's increasingly crowded spectrum, many practical applications have certain requirements for bandwidth, and it is difficult to use tuned filters with uncontrolled bandwidth.

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