A 239–281 GHz CMOS Receiver With On-Chip Circular-Polarized Substrate Integrated Waveguide Antenna for Sub-Terahertz Imaging

A 239-281 GHz sub-THz imager with circular- polarize d substrate-integrated-waveguide (SIW) antenna is demonstrated in CMOS 65 nm process with high spectrum resolution and high sensitivity for sub-THz spectroscopy imaging system with consideration of depolarization effects. The sub-THz imager is a receiver that consists of a circular polarized substrate integrated waveguide (SIW) antenna, down-conversion mixer and power gain amplifier (PGA). The proposed receiver is measured with -2 dBi conversion gain over 42 GHz bandwidth, -54.4 dBm sensitivity at 100 MHz detection resolution bandwidth, 6.6 mW power consumption and 0.99 mm² chip area. Moreover, frequency dependent sub-THz images are demonstrated by the proposed receiver.