Band configurable multi-band BPF using step impedance resonator structure

Now a days multi-band and multi-service applications are increased so need of reconfigurable components is increased. Proposed single design can play role of single-band, dual-band, tri-band or quad-band BPF as the configurations of switching devices are changed. This work is based on switching between different filters (having different numbers of passbands). Designed filters have passband frequencies of mobile communication and aeronautical radio navigation applications and can be changed by changing designing parameters. Designing and simulation of proposed microstrip filter structure is performed on commercial software CST microwave studio. Alumina (Epsilon εr = 9.9) sheet of height 0.5mm is used as substrate material.