Reconfigurable Bandpass Filter for use of 2.7– 3.1 GHz radar spectrum

A bandwidth reconfigurable Microstrip Bandpass Filter (BPF) for air traffic management and air defense radar system has been presented in this paper. The proposed structure achieves a fractional bandwidth of 3.24% at constant resonance frequency 2.9 GHz with minimum and maximum bandwidth as 366 MHz and 460 MHz respectively. All this is achieved in a compact size of 42.85 × 26.725 mm
²
.