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Unidirectional, highly-efficient planar twin arc-slot antenna elements backed by a reflector are presented. The theoretical radiation efficiency is as high as 99.9%. This high efficiency is achieved because the proposed slot geometry reduces the coupling to the parallel-plate TEM mode effectively in all directions on the substrate plane. A corporate-fed as well as a compact, center-fed, twin arc-slot elements have been implemented and tested. The parallel-plate TEM substrate patterns for a representative twin arc-slot element have been measured and compared with those of a corresponding straight twin-slot element. It was verified that the parallel-plate TEM mode, coupled from the proposed twin arc-slot element is greatly reduced in all directions. The measured gain improvement when a back-reflector is added is found to be about 2.8 dB, further validating this high efficiency. In addition to the high radiation efficiency, the proposed twin arc-slot element is more compact compared to the corresponding, straight, full-wavelength twin-slot element, making it well-suited for two-dimensional antenna arrays.
Published in:
Antennas and Propagation, IEEE Transactions on
(Volume:52
,
Issue:
1
)
Date of Publication: Jan. 2004
- Page(s):
- 53 - 58
- ISSN :
- 0018-926X
- INSPEC Accession Number:
- 7957730
- Digital Object Identifier :
- 10.1109/TAP.2003.822412
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 26 February 2004
- Issue Date :
- Jan. 2004
- Sponsored by :
- IEEE Antennas and Propagation Society
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