MINIMIZE PATTERN DEGRADATION WHEN SUBREFLECTOR VERTEX SHAPING IS USEDTO IMPROVE FEED MATCH

Authors
SPREY MA BIRD TS
Citation
Ma. Sprey et Ts. Bird, MINIMIZE PATTERN DEGRADATION WHEN SUBREFLECTOR VERTEX SHAPING IS USEDTO IMPROVE FEED MATCH, Electronics Letters, 32(9), 1996, pp. 781-782
Citations number
3
Categorie Soggetti
Engineering, Eletrical & Electronic
Journal title
Electronics Letters → ACNP
ISSN journal
00135194
Volume
32
Issue
9
Year of publication
1996
Pages
781 - 782
Database
ISI
SICI code
0013-5194(1996)32:9<781:MPDWSV>2.0.ZU;2-I
Abstract
A knob placed at the vertex of a subreflector to reduce subreflector m ismatch in a shaped Cassegrain antenna can significantly degrade the r adiation pattern and reduce efficiency. A practical procedure is descr ibed to lessen these effects. Best results are obtained using a cosine -squared-shaped knob, keeping a low knob height and knob base within t he feed blockage region. The importance of simultaneously optimising f or return loss, antenna efficiency and sidelobe level is emphasised.