Characteristics of Diode Detectors for Six- Port Radars

In recent times, six-port radar technology has been implemented for accurate phase measurements due to its low cost and easy implementation. This work focuses on various design aspects of a six-port radar for vital sign detection. The requirements for the system are derived from its operating conditions. As the diode detector plays a crucial role in the system, a simple yet analytical model is used to predict its behavior. This can help designers optimize the detector's design parameters, calculate link budgets, etc. The effects of Local Oscillator(LO) power level and load impedance are highlighted by studying the conversion gain, signal to noise ratio, and system resolution. The calculations are compared to Harmonic Balance simulations done with Kevsight ADS.