Title :
Caustic-fed cylindrical reflector antennas
Author :
El-Khamy, Said E. ; Elkamchouchi, Y.H.
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ.
Abstract :
The present paper gives a simple method for synthesizing a feed system for cylindrical reflector antennas working in UHF and VHF frequency ranges. The antenna radiation characteristics are carefully studied using the method of moments (MoM). The cylindrical reflector is represented by a set of parallel grids. The feeding elements are three half wavelength dipoles located at the caustic of the cylindrical reflector and phased, so that the cylindrical reflector is illuminated in phase. The radiation characteristics, gain and input impedance for different dimensions of the antenna are considered. Also the effects of changing the frequency and feeding elements locations on the antenna performance are studied. The results show that this antenna is very sensitive for both frequency variations and feeding elements phase shifting
Keywords :
UHF antennas; VHF antennas; antenna radiation patterns; dipole antennas; electric impedance; integral equations; method of moments; reflector antenna feeds; reflector antennas; MoM; UHF; VHF; antenna dimensions; antenna performance; antenna radiation characteristics; caustic-fed cylindrical reflector antennas; feed system synthesis; feeding elements; feeding elements location; feeding elements phase shifting; frequency range; frequency variations; gain; half wavelength dipoles; input impedance; integral equation; method of moments; parallel grids; phase illumination; Antenna feeds; Aperture antennas; Dipole antennas; Equations; Frequency; Geometrical optics; Microwave antennas; Moment methods; Optical surface waves; Reflector antennas;
Conference_Titel :
Radio Science Conference, 1999. NRSC '99. Proceedings of the Sixteenth National
Conference_Location :
Cairo
Print_ISBN :
977-5031-62-1
DOI :
10.1109/NRSC.1999.760878
