DocumentCode :
1061914
Title :
Twin Orthogonally Polarized UWB Aperture Antenna Elements With Optimized Profile Feed for Optimal Adaptation
Author :
Martínez-Fernández, José ; Gil, José M. ; Wiesbeck, Werner
Author_Institution :
Electromagnetismo y Teor. de Circuitos, Univ. Politec. de Madrid, Madrid, Spain
Volume :
8
fYear :
2009
fDate :
7/1/1905 12:00:00 AM
Firstpage :
517
Lastpage :
521
Abstract :
The objective of this letter is the design of twin orthogonally polarized ultrawideband (UWB) antenna elements with the lowest return losses posible, low mutual coupling between both polarizations, frequency-stable radiation pattern, and suitability for integration into an array. In order to satisfy the array integration and low mutual coupling criteria, two 2-cm radius circular apertures with perpendicular feeds were chosen as the starting point of the design. The profile of the feed for both apertures was optimized in order to minimize the return losses in the 3-11-GHz frequency band using a simulated annealing algorithm together with the finite element method (FEM) as the analysis tool. After the design and optimization procedure, a prototype was built and measured. Return losses of less than 15 dB were measured in the entire UWB band starting from 3.4 GHz for each port, while mutual coupling fell below the -20-dB limit for the same frequency band. Measured radiation patterns show 15 dB of difference between the copolar and cross-polar components and the pattern stability in directions with maximum radiation. Finally, good agreement between simulated and measured results serves to validate the optimization method.
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; aperture antennas; finite element analysis; microwave antenna arrays; simulated annealing; ultra wideband antennas; array integration; finite element method; frequency-stable radiation pattern; mutual coupling; optimal adaptation; optimized profile feed; simulated annealing algorithm; twin orthogonal polarized UWB aperture antenna elements; ultrawideband antenna elements; Aperture antennas; finite element methods (FEMs); optimization methods; ultrawideband (UWB) antennas;
fLanguage :
English
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
Publisher :
ieee
ISSN :
1536-1225
Type :
jour
DOI :
10.1109/LAWP.2009.2016768
Filename :
5067292
Link To Document :
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