A High-Selectivity Bandpass Filter Using Dual-Mode Coupling Resonator

Abstract In this work, a new model of high selectivity dual-mode bandpass filter is presented. The proposed filter consists of a set of coupled lines with a dual-mode adjustable response in its design process. An improvement in selectivity is presented by combining the dual-mode element with a classic band rejection structure, thus making it possible to introduce transmission zeros near the transmission band. A modeling is presented based on the traditional analysis of even and odd excitation circuit. Circuit and microstrip line simulations are carried out via ADS and Ansoft HFSS, and their results are compared with measurements made on a fabricated prototype. Its results were consistent with those of the process of analysis and synthesis of the high selectivity filter.