Two port small antenna characterization through impedance modulation

Small antennas characterization is tightly influenced by the measurement equipment as well as the scenario. In two port antennas isolation between ports, which is a clue factor to determine, is highly dependent on the final scenario also. To avoid these perturbing factors and obtain the complete S-parameter matrix of the antenna under test a wireless measurement setup has been developed. In this paper a contactless and autonomous small communication device is presented as a system able to characterize two port antennas based on the RCS measurement method. The system contains a microprocessor to control the frequency of the impedance modulation and two switches for changing the load impedance between the différent values used.