DocumentCode
951842
Title
Dual-frequency dual circularly-polarised patch antenna with wide beamwidth
Author
Bao, X.L. ; Ammann, M.J.
Author_Institution
Sch. of Electron. & Commun. Eng., Dublin Inst. of Technol., Dublin
Volume
44
Issue
21
fYear
2008
Firstpage
1233
Lastpage
1234
Abstract
A dual-frequency dual-circularly polarised patch antenna with wide beamwidth is proposed. The two-layer structure comprises circular patches with offset circular slots connected to rectangular slots. They provide orthogonal perturbations realising RHCP and LHCP for the lower and upper bands, respectively. The wide beamwidth is realised by extending the substrate beyond the groundplane. Measurements show a maximum beamwidth of 180deg and gains of 3.9 and 0.5 dBic for zenith and 10deg elevation, respectively, for the upper band. The measured beamwidth for the low band is 130deg with a maximum gain of 3.9 and -0.7 dBic for zenith and 10deg elevation, respectively. The axial-ratio is less than 3 dB in the hemisphere for elevations greater than 10deg for both bands.
Keywords
microstrip antennas; multifrequency antennas; polarisation; slot antennas; dual-frequency dual circularly-polarised patch antenna; offset circular slots; rectangular slots; wide beamwidth;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:20082284
Filename
4648965
Link To Document