Near-Field Coupling between a Printed Antenna and a Fabry-Perot Resonator: Experimental Study of the Radiation Properties at Millimeter Wave Frequencies

摘要

Compact focusing antennas, consisting of a Fabry-Perot (FP) cavity coupled to a printed source, are studied in the 60-GHz band. Several configurations of antennas, including plane-parallel or plano-convex cavities excited by a patch antenna or an array, are considered and compared. In particular, their radiation characteristics are investigated experimentally as a function of the operating frequency and the thickness of the free-space coupling region separating the primary radiator from the resonator. The optimum coupling conditions are also defined to maximize the efficiency and minimize the sidelobe level.