Abstract
A new design of aperture-coupled microstrip antennas for circular polarization (CP) is presented. The CP microstrip antenna is excited by using a series microstrip-line-feed configuration through the coupling of a ring slot in the ground. The effects of different ring-slot sizes on CP performance are investigated. The experimental results show that, when the mean radius of the ring slot is increased, the CP operating frequency is significantly decreased and a wider CP bandwidth can also be obtained. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 453–456, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20665
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