Split-resonant-ring-structure-based metamaterial microwave filter

Abstract

The invention relates to a split-resonant-ring-structure-based metamaterial microwave filter comprising at least one filter unit. The filter unit consists of a dielectric substrate, a transmission line, a complementary split resonant ring, and an open-loop resonator. The transmission line is arranged at the top layer of the dielectric substrate; and a cascade gap capacitor is loaded and a gap is formed in the middle. The open-loop resonator that is arranged at the top layer of the dielectric substrate and the transmission line are in a coplane mode; and the open-loop resonator is arranged below the transmission line. The complementary split resonant ring is arranged at the bottom layer of the dielectric substrate and includes an inner ring and an outer ring, wherein the inner ring and the outer ring are in a concentric mode and the opening position of the inner ring is opposite to the opening position of the outer ring. According to the filter provided by the invention, the open-loop resonator is introduced based on the traditional complementary split resonant ring and a transmission zero point is generated at a passband high end, thereby improving an asymmetric phenomenon of the out-of-band rejection characteristic and the frequency response.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a metamaterial microwave filter based on a split resonant ring structure. Background technique [0002] In a communication system, filters generally exist between the input and output stages of active circuits, and each filter has its own different functions. The filter is an indispensable device in the wireless communication system, and its performance is directly related to the communication quality of the entire system. The functions of the filter include: avoiding saturating the receiver front end due to leakage of the output signal at the transmitter; removing interfering signals such as image frequencies; reducing power leakage from the local oscillator at the antenna end; and attenuating the simultaneous presence of different communications interference between systems, etc. [0003] With the development of wireless communication, filter research has made new prog...

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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a metamaterial microwave filter based on a split resonator ring structure to solve the problems of poor out-of-band rejection at the high end of the filter passband and highly asymmetric frequency response in the prior art

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