A 60 GHz flip-chip bandpass filter in standard CMOS technology

In this paper, a novel 60 GHz flip-chip bandpass filter in standard CMOS technology is proposed. An insertion loss of 0.69 dB/mm for microstrip line is obtained at 60 GHz by using cascaded THRU de-embedding method. By deploying the gap between the flip-chip bump and the flipped chip, an endcoupled, half-wavelength resonator filter is designed and fabricated. The measured insertion loss of 3.3 dB and return loss of >13 dB with a bandwidth of 63% at centre frequency of 60 GHz clearly demonstrates that the proposed flip-chip filter is a promising candidate for 60 GHz integrated circuits applications.