Design of standard loads for calibrating the receiver at the antenna port

Abstract

Generally receiver systems are calibrated for their gain and phase characteristics using standard loads such as Short, Open and 50 ohms. In all these modules, connecting ports have two terminals – centre conductor and the ground. So connecting them to receiver modules having similar port types do not create any problem. However, to connect them to antenna port which has only centre conductor, we normally face difficulties due to port mismatch. To solve this problem, a microstrip transmission line based standard loads are designed which can be used to calibrate at the antenna port. This report presents the methodology of designing loads for the antenna port.