Reconfigurable Microwave Coupled Resonator Band-pass Filter and Diplexer

This paper presents the design, simulation and experimental results of a reconfigurable microstrip band-pass filter formed by two square open-loop resonators. A reconfigurable diplexer designed with four square spiral resonators is also proposed and preliminary simulation results are reported. The devices are designed to operate at S-band, and the reconfiguration is achieved using PIN diodes.