Micro-strip elliptic function band rejection filter

Abstract

The invention relates to a micro-strip elliptic function band rejection filter which comprises an input SWA connector, an output SWA connector and a micro-strip elliptic function band rejection filter circuit. The micro-strip elliptic function band rejection filter circuit comprises a micro-strip main line, single-mode resonators and double-mode resonators, wherein the single-mode resonators and the double-mode resonators are arranged along the micro-strip main line at intervals. The single-mode resonators and the double-mode resonators are connected with the micro-strip main line in a coupled mode. The center frequency of the single-mode resonators is the same as that of the double-mode resonators, the interval, between the single-mode resonators and the double-mode resonators, of the micro-strip main line is 1 / 4 wavelength. The double-mode resonators are each composed of two resonance units which are coupled to each other, wherein both the two resonance units are single-mode resonators of 1 / 2 wavelength, and the resonance frequency of the two resonance units are located at the two sides of the center frequency respectively. By means of the technical scheme, the micro-strip elliptic function band rejection filter has the elliptic function transmission feature and has the advantages of being deep in notch suppression, high in rectangle coefficient, low in passband insertion loss and the like.

Description

technical field [0001] The invention relates to the technical field of microwave devices, in particular to a microstrip elliptic function band-stop filter. Background technique [0002] Compared with the Chebyshev function filter and the Butterworth function filter, the elliptic function filter of the same order can achieve a steeper cutoff. However, due to the complexity of the prototype circuit of the elliptic function filter, the corresponding microwave filter is used in many forms of transmission lines such as striplines and waveguides, but not many forms are used in microstrip lines. The conventional design method is based on the Chebyshev function, and there is no precise calculation theoretical formula. The designed filter can only realize the pseudo / quasi-elliptic function transmission curve. Under the same filter order, there are small notch depth, low square coefficient, pass The belt has a large insertion loss and other deficiencies. Contents of the inventi...

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Problems solved by technology

However, due to the complexity of the prototype circuit of the elliptic function filter, the corresponding microwave filter is used in many forms of transmission lines such as striplines and waveguides, but not many forms are applied to microstrip lines.

The conventional design method is based on the Chebyshev function, and there is no precise theoretical formula for calculation. The designed filter can only realize the pseudo / quasi-elliptic function transmission curve. Under the same filter order, there are small notch depth, low square coefficient, pass Insufficient with large insertion loss

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