USE OF AN ACTIVE RETRODIRECTIVE ANTENNA-ARRAY AS A MULTIPATH SENSOR

The use of an active retrodirective antenna as an indicator of multipa th propagation effects is investigated in this letter, It is shown tha t the hat azimuthal gain response normally associated with a retrodire ctive antenna array can be significantly modified by the presence of m ultipath signals, These signals act as secondary sources impinging on the retrodirective antenna array and give rise to amplitude perturbati ons in its azimuthal gain response, Using a retrodirective antenna arr ay, the relative amplitude and phase components for the multipath sign als can be recovered, In this way, the retrodirective antenna can be u sed as a low-cost multipath sensor.