Title :
Design of high efficiency Fresnel zone plate antennas
Author :
Guo, Y.J. ; Barton, S.K. ; Wright, T.M.B.
Author_Institution :
Bradford Univ., UK
Abstract :
With a family of ideal radiation patterns, the theory for designing high-efficiency phase-correcting FZP (Fresnel zone plate) antennas is presented. The optimum 3-dB beamwidth of the feed pattern as a function of F/D (focal length/diameter) of the plate, the relation between the phase efficiency of the antenna and the number of subzones used in each full-wave zone, and the total efficiency limits of various versions are given. It is found that the maximum efficiency of a practical FZP antenna is usually less than 70%. The theory has been employed in designing a four-layer experimental FZP reflector antenna, and good agreement between the theoretical expectation and the measured value is obtained.<>
Keywords :
antenna radiation patterns; optical zone plates; reflector antennas; 3-dB beamwidth; Fresnel zone plate antennas; feed pattern; focal length/diameter; full-wave zone; high efficiency antenna; phase correction; phase efficiency; radiation patterns; reflector antenna; subzones; Antenna feeds; Antenna measurements; Antenna radiation patterns; Antenna theory; Costs; Fresnel reflection; Phase shifters; Polarization; Reflector antennas; Terminology;
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.1991.174803
