Design of 2-12 GHz Ultra-Wideband Band Pass Filter Using GAAS Integrated Passive Device Technology

Abstract

An Ultra-Wideband band pass filter (UWB-BPF) based on GaAs Technology is considered in this article. It is designed by cascading the High pass filter (HPF) and Low pass filters (LPF) with a transmission-zero out band rejection method. The two filters were designed with 5th order Chebyshev approach separately and then cascaded to get the desired band pass filter. To have a fast roll-off attenuation, out-of-band transmission zero is applied. Thus, a parallel resonance circuit is used. Moreover, L-network impedance matching has been introduced to enhance the input return loss. The design has been successfully realized in theory and also verified by its full layout EM simulation. The resulting UWB-BPF with 3.23 mm2 compact size provides 1.2 dB insertion loss, 134.6% fractional bandwidth, 78% selectivity factor, 0.094 ns group delay, and 16.2 dB return loss.