A switchable tunable dual-band filter using varator diodes for tuning and switching

A switchable tunable dual-band filter using varator diodes for band switching and frequency tuning is proposed. The tuning range of first band is from 2.3 to 2.8 GHz and second one is from 1.8 to 2.1 GHz. The proposed dual-band filter is composed of two second-order Chebyshev short-ended hairpin comb filters which embedded a pair of the varators as a switching and tuning elements. The simulated and measured results are matched well.