Novel compact millimeter‐wave gap waveguide filter with double‐sided selectivity

Abstract

Novel compact gap waveguide (GW) filter with negative coupling structure is proposed. GW is an attractive technology to design accurate millimeter-wave components without electrical connection. It takes advantages of high Q-factor, low loss, capability of integration with MMICs and multilayer implementation. GW features with stacked and negative coupling topology are effectively employed here to bring a high performance interconnect, miniaturized and cost-effective filter. A fourth-order Ka-band filter with two prescribed symmetric transmission zeros is designed and fabricated based on the groove GW platform. The simulation and measurement results verify the validity of the method and exhibit high double-sided selectivity.filter, groove gap waveguide resonator, high performance, negative coupling structure, transmission zeros | I NT ROD UCTI ONEfficient utilization of RF power and frequency spectrum as well as total size reduction are important challenges in the design of modern RF systems. Filter with prescribed transmission zeros (TZs) is an effective component in the most wireless and satellite communication systems where high performance Filter for efficient utilization of power and spectrum as well as compact size is required. Filters with TZs have the ability to well compromising between the maximum possible close-to-band rejection, high selectivity and at the same time minimum number of resonators, which in turn, effectively reduce the total size and insertion loss.