Title :
A bifocal reflector antenna with Gregorian configuration
Author :
Lorenzo, M.E. ; Rappaport, C.M. ; Pino, A.G.
Author_Institution :
Dpto. Tecnologias de las Comunicaciones, Vigo Univ., Spain
Abstract :
The bifocal dual reflector antenna system is an important wide-angle scanning antenna configuration, offering an extra degree of design freedom over single reflectors. Although bifocal subreflectors tend to be large, offset configurations can be designed to minimize this effect. The article examines a relatively unknown bifocal configuration, one having a concave, Gregorian subreflector. Also, design formulas for all types of bifocal systems are presented, which extend the exact, two-dimensional main and subreflector profile curves into 3-D reflector surfaces. A design example for a symmetric Gregorian bifocal with a 20/spl deg/ field of view (/spl plusmn/8/spl deg/ design scan angle) is given.
Keywords :
antenna radiation patterns; offset reflector antennas; scanning antennas; 3D reflector surfaces; antenna radiation patterns; bifocal dual reflector antenna system; bifocal subreflectors; bifocal systems; concave Gregorian subreflector; design formulas; design scan angle; exact 2D main reflector profile curves; subreflector profile curves; symmetric Gregorian bifocal; wide angle scanning antenna; Aperture antennas; Differential equations; Electromagnetics; Least squares approximation; Least squares methods; Polynomials; Process design; Reflection; Reflector antennas; Surface fitting;
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.1996.549583
