Radiation properties of microstrip array antennas fed by radial line

Abstract

AbstractThis paper proposes a new type of radial line microstrip antenna and studies both the design method and radiation characteristics. The following conclusions are obtained.(1) The relationship between the basic design parameters of this new type of planar antenna and the radiation characteristics was demonstrated, and the essential design data of this type of antenna were obtained.(2) A boresight antenna was fabricated based on the design data obtained in the foregoing, and it was shown clearly that such a type of antenna system offers an aperture efficiency of above 90 percent, ranging from the small‐aperture (low‐gain) type to the large‐aperture (high‐gain) type.(3) A beam‐tilt type antenna also was studied theoretically as well as experimentally, and the relationship of its radiation characteristics with the tilt angle and aperture efficiency was explained. It was demonstrated that such an antenna system may be considered to be effectively applicable as a high‐efficiency circularly polarized planar antenna.