[en] MOM ANALYSIS OF A REFLECTOR ANTENNA DESIGN FOR OMNIDIRECTIONAL COVERAGE

[pt] JOSE RICARDO BERGMANN

[pt] FLAVIO JOSE VIEIRA HASSELMANN

[pt] MARCOS GUIMARAES CASTELLO BRANCO

[en] REFLECTOR ANTENNAS

[en] ANTENNAS

[en] ENVIRONMENTS

[en] Radio base stations for point-to-multipoint communications usually employ arrays of antennas at a certain height from the ground for omnidirectional coverage, with element excitations being exercised in order to achieve a suitable elevation pattern synthesis. More recently, attention has been focused on point-to-multipoint (not necessarily mobile ones, but fixed as well) services such as broadband wireless (high-density fixed) systems for which compact shaped reflector antennas comprise an interesting alternative to usual base station arrays due to their ability in providing customized coverage patterns, with bandwidth requirements now being met via adequate feed designs. Prospective reflector designs, while producing cosecant squared-like power patterns in the vertical plane to account for free space attenuation, should also concentrate radiated energy bellow the horizon line for reduced interference. One such configuration, explored in [1], involved a nodal station comprising up to four shaped offset reflector antennas for quadrant sectors coverage, with substantial design effort aimed at properly modeling the reflector surfaces [2]. Alternatively, a compact configuration employing a single circularly symmetrical shaped reflector surface fed by an axial horn, has been investigated in [3]. A specific design of the latter configuration is further explored herein with a view towards evidencing the benefit of a strictly numerical analysis fool such as the Method of Moments (MOM) for both reflector and feed structures, as compared to the more conventional optical (geometrical and physical) route.

2013-12-16

[pt] TEXTO

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INGLÊS

https://www.maxwell.vrac.puc-rio.br/colecao.php?strSecao=resultado&nrSeq=22395@2