Multi-branch loading-based three passband high-temperature superconductive filter

Abstract

A multi-branch loading-based three passband high-temperature superconductive filter is characterized in that four open circuit branches and one short circuit branch are loaded on a uniform impedance resonator, wherein the short circuit branch is loaded at the middle position point of the uniform impedance resonator; the first and third open circuit branches are loaded on the uniform impedance resonator by being symmetrical about the short circuit branch; the second and fourth open circuit branches are loaded on the uniform impedance resonator by being symmetrical about the short circuit branch, and are the same as or opposite to the direction of the first and third open circuit branches on the uniform impedance resonator; an incoming feeder and an outgoing feeder are coupled with the branch loaded uniform impedance resonator by gaps; and the incoming and outgoing feeders are coupled in an interdigital manner. The multi-branch loading-based three passband high-temperature superconductive filter realizes the control on the band pass position and band width of the filter, is capable of effectively reducing the number of the resonators, and effectively improving the stop band property of the filter, has the good characteristics of linear phase and steep out-of-band property, and realizes the miniaturization of the filter.

Description

technical field [0001] The invention belongs to the technical field of microwave communication equipment, and relates to a microwave filter. Background technique [0002] With the rapid development of the communication industry, various communication standards exist at the same time, and the frequency resources are becoming more and more tight, so that the frequency band used by each communication standard is often divided into several non-adjacent parts. Therefore, realizing multi-band sharing is an important topic in the design of modern microwave communication systems. As a key device in the communication system, the multi-frequency design of the microwave filter has become a key technology. Usually, it can be implemented by connecting a broadband bandpass filter in series with multiple narrowband bandstop filters; or by connecting multiple different bandpass filters in parallel. In order to achieve impedance matching at the input and output terminals, it is usually nece...

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Problems solved by technology

However, the above-mentioned applications are all based on the design method of a single-band filter. At the same time, an external impedance matching network will result in a larger circuit area and greater entry and exit loss, as well as the difficulty of design.

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