Phase Correction Method for GO Designed Dielectric Lens Horn Antenna

Atsushi KEZUKA  Yoshihide YAMADA  Yasuhiro KAZAMA  

IEICE TRANSACTIONS on Communications   Vol.E88-B   No.6   pp.2334-2340
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.6.2334
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
TM01mode,  lens horn antenna,  omni directional coverage,  geometrical optics,  FDTD,  ray tracing,  matching layer,  

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In order to achieve omni-directional coverages on base station antennas for fixed wireless access systems (FWA), a TM01 mode conical horn with 4.6λ aperture size was employed as a feed horn for an axisymmetrical reflector antenna. Here, a shaped dielectric lens was inserted in the conical horn so as to achieve low sidelobe radiation characteristics. However, it was pointed out that radiation pattern shaping ability was degraded in this small lens antenna. In this paper, deteriorations of aperture distributions in a shaped lens are clarified through FDTD calculations. Severe phase delays are shown in the aperture phase distributions. A novel lens shaping method of compensating the phase delays is developed. Aperture distributions and radiation patterns of the corrected lens are estimated through FDTD calculations. Satisfactory uniform phase distributions in aperture distributions and low sidelobe radiation patterns are ensured.