Transmission Coefficient Measurement Based on Six-port Correlator in 28-GHz-band

A conventional coefficient transmission measurement is performed on a vector network analyzer based on a super-heterodyne scheme. The circuit structure tends to be complicated and not cost-effective because of the implementing local oscillators, low noise amplifiers, and mixers. To simplify the circuit structure and make it affordable, we employ a six-port method, namely, the homodyne scheme. We develop a six-port correlator based on a quadrature hybrid coupler on a printed circuit board. In this study, we demonstrated the performance of a six-port correlator in the 28-GHz-band on a transmission coefficient measurement.