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A novel polarization reconfigurable ring‐slot antenna with frequency agility

A novel reconfigurable ring‐slot antenna with switchable polarization and frequency agility is presented. Circular polarization (CP) radiation of the proposed antenna is achieved by introducing proper asymmetry in the ring‐slot structure and feeding the ring slot using a microstrip line at 45° from the introduced asymmetry. Two diodes are used to reconfigure the structure of the ring slot. Switching between right‐hand and left‐hand CP is achieved by turning the diodes on or off and the two CP modes are operated at different frequencies. Moreover, the antenna has a simple structure, which is easier to be fabricated. An antenna prototype is implemented and the measured results are shown. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 540–543, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24064