A V-band CPW bandpass filter with controllable transmission zeros in integrated passive devices (IPD) technology

Abstract

A 60 GHz CPW bandpass filter (BPF) with two controllable transmission zeros is proposed. The BPF, which utilizes the spiral defected ground structure (DGS) and interdigital structure as the resonators, is designed and fabricated on the integrated passive device (IPD) technology. The proposed filter has the measured 3dB bandwidth of 8.53 GHz (56.54-65.07 GHz) with the insertion loss of 4.84 dB including pads. The center frequency is 60.81 GHz, and the maximum return loss is better than 25 dB in the passband. A good agreement between the simulated and measured results has been shown. By comparing to other reported Si-based V-band BPFs, this work achieves a good fractional BW (FBW) of 14% with a compact size of 0.18mm2.