Investigation of the parasitic loop counterpoise antenna

The radiation field produced by a parasitic loop counterpoise antenna is investigated. This is a new antenna configuration which consists of a small circular loop in the presence of a large parasitic loop and is placed above a circular ground plane or counterpoise. Geometrical theory of diffraction is applied to obtain the theoretical expressions for the far field produced by such an antenna. Within the range of approximation the agreement between theory and experiment has been found to be very good. The introduction of a parasitic loop, in general, reduces the ground plane edge diffraction effects on the far-field patterns and makes the overall pattern in the half-plane above the counterpoise less directional. Possible application of the antenna is also discussed.