Compact Microstrip for Dual Bandpass Filter

Abstract

A new configuration of Dual Bandpass Filter was proposed and developed on a basis of the Stepped Impedance Resonators( SIR ) and the Parallel Coupled Microstrip Line ( PCML). Spiral compact was used as the Stepped Impedance Resonators for tuning dual band resonators, and Hairpin comb structures was used as the coupling and matching network at input and output. Both were proposed to achieve dual band characteristics. The filter was designed to have the main center frequency at 800 MHz and second frequency at 1,700 MHz Measured characteristics of the filter indicated a reasonable agreement with simulated responses