High temperature superconductive microstrip filter with tap structure

Abstract

The invention relates to a high temperature superconductive microstrip filter with a tap structure, which belongs to the field of microwave communication technology equipment. The microwave filter comprises an input feeder, an output feeder, and a plurality of sections of U type half wavelength resonators which are arranged in parallel, and is characterized in that: at least one section of half wavelength resonator is a resonator with the tap structure and is used for introducing a transmission zero into the passband edge of the filter. In the high temperature superconductive microstrip filter, the appropriate transmission zero is introduced by using the tap structure to make a transitional zone steep. The high temperature superconductive microstrip filter has the advantages of small overall size, low insertion loss, high out-of-band rejection and the like, is used for manufacturing a high temperature superconductive filter and is suitable for a plane type common metal microstrip filter.

Description

technical field [0001] The invention belongs to the technical field of microwave communication equipment, and particularly relates to the design of microwave filters. Background technique [0002] Microwave filters are very important microwave components. The ideal filter characteristic should be that there is no attenuation in the passband and infinite attenuation in the cutoff region, and the transition between the passband and the cutoff region is as steep as possible. At present, the goal of filter design is to make the filter have lower in-band insertion loss and steeper passband edge, so as to achieve good selectivity while keeping the overall size of the filter as small as possible. [0003] For the reduction of in-band insertion loss, the use of high temperature superconducting materials plays a key role. With the development of high temperature superconducting thin film material preparation technology, the practical process of superconducting microstrip line filter...

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Problems solved by technology

However, when the frequency is high, the size of the resonator constituting the filter is small, and the electrical length of the coupled microstrip line is even longer than the electrical length of the resonator itself. The coupled microstrip line will introduce a series of unwanted resonance modes near the passband , it is difficult to achieve good filter performance

In addition, the method of introducing a quarter-wavelength bandstop line or other notch elements on the input and output feeders is also used to achieve the high-band edge steepness response of the filter, but this method will increase the length of the feeder, and Affect the Q value of external input and output, increasing the difficulty of design

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