Aperture Coupled Patch Antennas and Arrays
MASSACHUSETTS UNIV AMHERST AMHERST United States
Pagination or Media Count:
Phased arrays of microstrip patch antennas are being studied extensively millimeter wave applications, in which the feeds for several elements including the TR modules might be integrated onto a single GaAs substrate. It is hoped that this integrated method of fabrication will improve performance and reduce the cost per element in large arrays. Many investigators are finding, however, that patch arrays on GaAs do not perform as well as they would on a lower permittivity substrate. Also, the area available in the unit cell generally lambdao2 by lambdaoz is not sufficient to place the radiators and all of the circuit components on a single surface. The aperture coupled patch antenna permits the use of a low epsilonr substrate for the antenna, and GaAs for the active circuits. An intervening ground plane isolates the feed network from the radiating face of the array, and undesirable via connections are not required. This paper describes an eight-element linear array of aperture coupled patches that is designed for E-plane scanning.