SIR-based high-performance miniaturized microwave differential filter

Abstract

The invention discloses a high-performance miniaturized microwave differential filter based on an SIR, which works in a microwave frequency band, can be processed by adopting processes such as a PCB, a semiconductor and an LTCC, and comprises two metal layers and a dielectric layer, the dielectric layer is arranged between the two metal layers and is used for connecting the upper metal layer and the lower metal layer; the lower metal layer is a grounding layer and comprises a grounding metal plate; the upper layer is a structural layer and comprises a plurality of DBSSIRs and a plurality of pairs of differential ports; the plurality of DBSSIRs are sequentially cascaded, and the plurality of pairs of differential ports are respectively connected to two ends of the cascaded DBSSIRs; the filter has no metal grounding through hole, thereby avoiding the influence of parasitic parameters. Based on the micro-strip SIR technology, the invention provides a design technology of a miniaturized planar differential filter which works in a microwave frequency band and has high CMRR and low parasitic parameter effect, and the miniaturized planar differential filter has high frequency selectivity and wide stop-band suppression performance of the filter at the same time.

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