High-Isolation Multimode Multifunction 24-/60-GHz CMOS Dual-Bandpass Filtering T/R Switch

Abstract

Fully integrated 24-/60-GHz dual-band transmit/receive (T/R) switch capable of bandpass filtering and switching operations in single bands and concurrent dual band, coupled with simultaneous transmission and reception, is developed using a 0.18- $\mu \text{m}$ SiGe BiCMOS process. The developed bandpass filtering switch can also function as a diplexer with switching functions. The measured insertion losses of the T/R switch are 2.9 and 8.7 dB at 24 and 60 GHz in single-band modes and 3/8.8 dB at 24/60 GHz in concurrent dual-band mode, respectively. The measured isolations are 53 and 43 dB at 24 and 60 GHz in single-band modes and 50/57 dB at 24/60 GHz in concurrent dual-band mode, respectively. The measured inputs $P_{1-\text {dB}}$ are 20.6 and 16.4 dBm at 24 and 60 GHz in single-band modes and 15.9/13 dBm at 24/60 GHz in concurrent dual-band mode, respectively. The measured inputs IP3 are 23.2 and 22.5 dBm at 24 and 60 GHz in corresponding single-band modes, respectively. The total chip size is $1480~\mu \text{m}\times 520~\mu \text{m}$ excluding all the RF and dc pads.