Wideband Dipoles on Electromagnetic Bandgap Ground Planes

The performance of broadband dipole antennas above electromagnetic bandgap (EBG) structures is investigated. Two different structures are examined. One is a diamond dipole over an EBG with square patch elements optimized by hand and the other an open sleeve dipole over an EBG optimized by a genetic...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2007-09, Vol.55 (9), p.2426-2434
Main Authors: Akhoondzadeh-Asl, L., Kern, D.J., Hall, P.S., Werner, D.H.
Format: Article
Language:English
Subjects:
Antenna accessories
Antennas
Applied sciences
Bandwidth
Broadband antennas
Design optimization
Dipole antennas
Dipoles
Electromagnetic bandgap (EBG)
Exact sciences and technology
Gain
genetic algorithm (GA)
Genetic algorithms
low profile antenna
Metamaterials
Performance gain
Periodic structures
Radiocommunications
Sleeves
Telecommunications
Telecommunications and information theory
Wideband
wideband dipole antenna
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Summary:The performance of broadband dipole antennas above electromagnetic bandgap (EBG) structures is investigated. Two different structures are examined. One is a diamond dipole over an EBG with square patch elements optimized by hand and the other an open sleeve dipole over an EBG optimized by a genetic algorithm (GA). Both configurations demonstrate that a low profile dipole antenna over an EBG can have a broad bandwidth. Careful design of both is required and in particular for best results, the antenna-EBG system should be optimized together, rather than as separate components. The performance is compared to an absorber backed wideband dipole antenna and it is found that the gain is significantly increased, whilst the bandwidth is reduced. In general, for the diamond dipole antenna return loss bandwidths of over 2:1 (67%) have been achieved, although radiation pattern control is difficult and reduces the bandwidth to the order of 1.4:1 (33%). The sleeve dipole over an EBG achieved a bandwidth of 1.28:1 (26%). The realized gain, which is power gain reduced by input match loss, of both structures are approximately the same. GA optimization and parametric studies seem to suggest that bandwidths significantly greater than these are difficult to achieve.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2007.904071