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Dual-frequency stacked annular-ring microstrip antenna

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3 Author(s)
Dahele, J.S. ; Royal Military College of Science, Shrivenham, Swindon, UK ; Lee, K.-F. ; Wong, D.

Experimental results of a dual-frequency microstrip antenna consisting of two stacked annular rings of outer radii 5 cm and inner radii 2.5 cm are presented. Fabricated on a Duroid substrate with relative permittivity 2.32 and thickness 0.159 cm, the separations of the two resonant frequencies range from 6.30-9.36 percent for the first three modes. The frequency separations can be altered by means of an adjustable air gap between the lower ring and the upper substrate.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:35 ,  Issue: 11 )

Date of Publication:

Nov 1987

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