An RCS measurement technique to extract the impedance of high-impedance aperture and slot antennas

We introduce a novel technique to measure the input impedance of generally high-impedance aperture antennas whereby a relationship is established between the RCS of a slot/aperture antenna to its impedance/conductance. Then, the necessary condition which must be met when the receiving antenna is terminated by a matched load is derived and used to identify the corresponding RCS. Comparing the RCS of the loaded antenna in conjunction with the criteria provided by the proposed method can determined whether the receiving antenna is matched or not. If not, one can change the termination resistance until the required conditions on the RCS are met, and, then, identify the matched load that is equal to the impedance of the antenna at resonance.