D-Band FMCW Radar Sensor for Industrial Wideband Applications with Fully-Differential MMIC-to-RWG Interface in SIW

The paper presents a monostatic D-Band FMCW radar based on a fully integrated mono-static single-channel SiGe transceiver chip. The chip is fabricated in Infineon's BiCMOS production technology B11HFC which offers HBTs with an f T / f max of 250/370 GHz. The MMIC's output signal is coupled by a fully-differential SIW based coupling network with a bandwidth of more than 70 GHz. The output power at the WR-6.5 antenna flange is more than −10 dBm over a bandwidth of 37.5 GHz. For a sweep within a single-loop PLL circuit from 174.5 GHz to 121.5 GHz with a ramp duration of 6 ms, a spatial resolution of 4.6 mm with a metallic plate as the target at a distance of 0.6 m is achieved. The in-loop phase noise at 10 kHz offset is better than −70 dBc/Hz in this frequency range. The radar provides a small form factor of 2×4×5 cm 3 and low power consumption of 2.2 W at 5 V at a USB supply.