Dual-mode three-way wide-band filter based on multi-branch loaded square resonance ring

Abstract

The invention discloses a dual-mode three-way wide-band filter based on a multi-branch loaded square resonance ring, which mainly solves the problem that the frequency selectivity of a conventional dual-mode three-way wide-band filter is difficult to control. The filter comprises a micro-band dielectric substrate (1), a metal grounding plate (2), two symmetrical multi-branch loaded square resonance rings (3 and 4) and input and output feed lines (11). Each multi-branch loaded square resonance ring comprises a square metal ring (5), a lower perturbation branch (6), an upper perturbation branch (7), a transmission zero point branch (8), and a pair of perturbation metal sheets (9 and 10). The two perturbation branches (6 and 7) are located at a pair of external opposite angles of the square metal ring (5). Each perturbation branch is parallel to both sides of the metal ring (5). The pair of perturbation metal sheets (9 and 10) is located inside the other pair of opposite angles of the metal ring (5). The transmission zero point branch (8) is connected with the lower perturbation branch (6) in parallel and the input and output feed lines (11) are symmetrically placed above the micro-band dielectric substrate (1) and extend into one side of the metal ring (5) and the middle of the upper perturbation branch (7) in parallel. According to the filter, the frequency selectivity is improved, and the filter has good out-of-band rejection and can be applied to a wireless communication system.

Description

technical field

[0001] The invention belongs to the technical field of electronic devices, in particular to a microstrip dual-mode three-pass band filter, which can be used for a radio frequency front end of a wireless communication system. Background technique

[0002] With the rapid development of mobile communication, satellite communication, radar, and remote sensing technology, the wireless spectrum is increasingly crowded, which puts forward very strict requirements on the radio frequency microwave filter in the communication system. Microstrip filters have the advantages of small size, light weight, low cost, and easy processing, and are widely used in microwave circuits. There are various types and realization forms of microstrip filters, and the research of miniaturized high-performance microstrip filters has always been a hot field. Traditional filter forms such as Butterworth and Chebyshev filters can only meet high selectivity requirements by increasing the numb...

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