An investigation into the gustafsson limit for small planar antennas using optimization
Date
2014
Authors
Shahpari, M.
Thiel, D.
Lewis, A.
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Journal article
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IEEE Transactions on Antennas and Propagation, 2014; 62(2):950-955
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Morteza Shahpari, David V. Thiel and Andrew Lewis
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Abstract
The fundamental limit for small antennas provides a guide to the effectiveness of designs. Gustafsson et al., Yaghjian et al., and Mohammadpour-Aghdam et al. independently deduced a variation of the Chu-Harrington limit for planar antennas in different forms. Using a multi-parameter optimization technique based on the ant colony algorithm, planar, meander dipole antenna designs were selected on the basis of lowest resonant frequency and maximum radiation efficiency. The optimal antenna designs across the spectrum from 570 to 1750 MHz occupying an area of 56 mm × 25 mm were compared with these limits calculated using the polarizability tensor. The results were compared with Sievenpiper's comparison of published planar antenna properties. The optimized antennas have greater than 90% polarizability compared to the containing conductive box in the range 0.3 <; ka <; 1.1, so verifying the optimization algorithm. The generalized absorption efficiency of the small meander line antennas is less than 50%, and results are the same for both PEC and copper designs.
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© 2013 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.