Title :
Circularly-polarized waveguide array with slots and dipoles
Author :
Hirokawa, J. ; Nanbu, T. ; Ando, M. ; Goto, N.
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Japan
Abstract :
A circularly polarized waveguide array is designed for direct broadcast satellite (DBS) receiving. As a low loss circular polarizer, a dipole array is etched on a polyethylene sheet and is placed in front of a linearly polarized slotted waveguide array. A circularly polarized radiator composed of a slot and a dipole is numerically designed for an array element taking the mutual coupling into account. A 25-element linear array is designed to obtain uniform illumination. The design is verified by measuring the reflection, the aperture distribution, and the radiation pattern. The reflection is suppressed below -20 dB over the 5% bandwidth. Uniform aperture distribution is obtained at the design frequency.<>
Keywords :
antenna radiation patterns; dipole antennas; direct broadcasting by satellite; electromagnetic wave polarisation; microwave antenna arrays; receiving antennas; satellite antennas; waveguide antennas; DBS; aperture distribution; array element; bandwidth; circularly polarized radiator; circularly polarized waveguide array; design frequency; dipole array; direct broadcast satellite; linearly polarized slotted waveguide array; low loss circular polarizer; mutual coupling; polyethylene sheet; radiation pattern; receiving antenna; reflection; slots; uniform illumination; Apertures; Bandwidth; Etching; Frequency; Lighting; Mutual coupling; Polarization; Polyethylene; Reflection; Satellite broadcasting;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1991. AP-S. Digest
Conference_Location :
London, Ontario, Canada
Print_ISBN :
0-7803-0144-7
DOI :
10.1109/APS.1991.175097
