On-Chip FGCPW lowpass and bandpass filters with low insertion loss and high stopband rejection for V-band applications

This paper presents compact on-chip finite ground coplanar waveguide (FGCPW) lowpass filter (LPF) and bandpass filter (BPF) for V-band multi gigabit per second (Gbps) wireless personal area network (WPAN) applications. The equivalent lumped-element circuit of the proposed filters can be represented by an ABCD matrix which is obtained by consecutively multiplied ABCD matrixes of one T-network impedance and two shunt admittances. The full-wave EM simulators, Ansoft™ HFSS and Agilent™ Momentum, were used to fine tune the desired frequency response. The FGCPW LPF and BPF were implemented in WIN™ semiconductor 0.15 μm pHEMT process. The obtained insertion losses are smaller than 0.5 dB and 1.5 dB with return losses of better than 12 dB and 13 dB, respectively. The 1-dB bandwidths of the LPF and BPF are 70 GHz (0-70 GHz) and 11 GHz (55-66 GHz), respectively. The stopband rejections are better than 20 dB from 95 to 120 GHz in the LPF, and from 0 to 42 GHz and 82 to 120 GHz in the BPF. The measured frequency responses show good agreements with the simulations. The chip size is very compact of 0:43 × 0:45mm².