Title :
Annular slot antennas on extended hemispherical dielectric lenses
Author :
Colomb, F. ; Hur, K. ; Stacey, W. ; Grigas, M.
Author_Institution :
Adv. Device Center, Raytheon Co., Andover, MA, USA
Abstract :
Annular slot antennas (ASA) at 35 GHz and 94 GHz have been analyzed by measuring their input impedance, computing radiation patterns, and extracting therefrom quantities relevant to quasi-optical systems. A full-wave analysis in the spectral domain allows the rigorous modeling of the fields in the several dielectric layers that form the antenna and of the radiation patterns. A technique for equalizing the E and H plane beamwidths is presented. One design at 94 GHz indicates a directivity of 22 dB, Gaussian coupling efficiency of 84 percent, a sidelobe level of 17 dB, and intensity front-to-back ratio of 30 dB.
Keywords :
antenna radiation patterns; directive antennas; electric impedance; loop antennas; millimetre wave antennas; slot antennas; spectral-domain analysis; 35 GHz; 94 GHz; E plane beamwidth; Gaussian coupling efficiency; H plane beamwidth; annular slot antennas; design; dielectric layers; directivity; extended hemispherical dielectric lenses; full-wave analysis; input impedance; intensity front-to-back ratio; quasi-optical systems; radiation patterns; sidelobe level; spectral domain; Antenna measurements; Dielectric measurements; Feeds; Gallium arsenide; Impedance measurement; Lenses; Polarization; Polyimides; Radio frequency; Slot antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1996. AP-S. Digest
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-3216-4
DOI :
10.1109/APS.1996.550045
