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Electronically switchable microwave fllters are attracting more attention for research and development because of their importance in increasing the capability of wireless communication and cognitive radios. In this paper, novel switchable microwave band- stop to all pass fllters are designed by using stepped impedance resonator. Commercially available Pin diodes are used in order to allow the fastest switching between band-stop and all pass responses. The theoretical analysis is presented in this paper, and its feasibility has been experimentally verifled with a micro-strip prototype. The design was also characterized by measuring the fllter performance with increasing power levels of 20, 15, 10, 5, and 0dBm. The results have shown that the switchable fllter is immune to power saturation efiects. Nonlinear measurements at higher power levels are also performed and the switchable fllter produced low power inter-modulation product. The main advantage of this fllter is its capability to switch between band-stop and all pass mode of operation. Other advantages include being small in size, and low in cost.

SWITCHABLE MICROWAVE BAND-STOP TO ALL PASS FILTER USING STEPPED IMPEDANCE RESONATOR