DC-20 GHz differential transmit/receieve DP4T switching matrix for radar-based target detection

A DC-20 GHz differential transmit/receive (T/R) double-pole-four-throw (DP4T) switching matrix has been developed on standard 65 nm CMOS process for the first time for ultra-wideband radar based tumor detection. The measured input and output matching bandwidth are 0–20 GHz where both the input and output return losses are greater than 10 dB. Measured average insertion loss from Tx or Rx port to different output ports are 2.72 dB, 3.6 dB, 4.5 dB and 5.9 dB at 3 GHz, 6 GHz, 10 GHz and 17 GHz, respectively, with a power consumption of less than 1 mW. When the output ports were connected to PCB connectors, 0–18 GHz matching bandwidth was obtained by flip chip mounting, quarter wavelength microstripline impedance matching and optimization of the thickness and dielectric constant of printed circuit board.