A Compact Ka-band Bandpass Filter Using Lumped-Distributed Resonator based on Integrated Passive Device Process

One compact Ka-band bandpass filter using lumped-distributed resonators is proposed, with almost 17% size reduction compared to the filter without grounded MIM capacitor. By loading grounded MIM capacitor at the intersection of quasi-lumped resonators, compact size and high stopband suppression are achieved. Based on GaAs-based integrated passive device (IPD) process, a Ka-band bandpass filter with chip size of 0.4 mm
²
is designed. The simulation results indicate one return loss of 0.56dB at the center frequency of 25 GHz and 3-dB FBW of 33.6%.