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Dual‐frequency circularly‐polarized microstrip antenna with switchable polarization sense
Author(s) -
Wu JiaFeng,
Row JeenSheen,
Wong KinLu
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23569
Subject(s) - microstrip antenna , patch antenna , microstrip , optics , physics , circular polarization , turnstile antenna , microwave , folded inverted conformal antenna , optoelectronics , electrical engineering , antenna (radio) , coaxial antenna , engineering , quantum mechanics
A dual‐frequency circularly‐polarized (CP) microstrip antenna capable of switching polarization sense is presented. The antenna is fed by a microstrip line through aperture coupling. First, it is found that a CP mode can be excited when the radiating patch is square and an open‐ring slot is used as the coupling aperture. Then, by truncating the radiating patch, another CP mode can be obtained. The two CP modes have reversed polarization senses, and their operating frequencies are different. For the proposed dual‐frequency CP microstrip antenna, two prototypes with frequency ratios of 1.07 and 1.23 were constructed, and voltage‐controlled diodes are employed to achieve the electrical switching between the two CP modes. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2125–2128, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23569