A Ka-Band Analog Complex Correlator Based on Integrated Six-Port Chip for Millimeter-Wave Temperature Measurement

In this paper, the design and measurement of a Ka-band (32-36 GHz) analog complex correlator based on integrated six-port chip for human body temperature measurement are described. The designed correlator uses the add-and-square method by employing six-port distribution network and zero-bias Schottky diodes. Moreover, the integrated six-port chip, which integrates amplifiers, phase shifters, and a six-port circuit, is applied in the correlator to realize a compact size. To verify the characteristics of the analog correlator, the single-frequency test with different input power levels and the sweep-frequency test with input power fixed are applied to the correlator. The measurement results reveal that the input power of the correlator should be less than -35dBm and the correlation efficiency is larger than 92%.