60 GHz Bandpass Filters with Small and Large Bandwidths Using Thin Film Coupled Microstrip in 0.18-μm CMOS

In recent publications of millimeter wave filters in standard CMOS, only single designs have been shown, all with bandwidths exceeding 25%. Here we present the systematic design and implementation of 60 GHz bandpass filters with a broad range of bandwidths in a 0.18-mu m CMOS technology. Experimental results show that filters with bandwidths larger than 50% achieve an Insertion loss less than 3 dB. The insertion loss increases to 9 dB as the bandwidth decreases to 10%. Furthermore, the relationship between insertion loss and bandwidth is established through measurement and compared to theoretical predictions. The results facilitate important design trade-offs for bandpass filter in transceiver front-end applications.