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Design of a Multiband Quasi-Yagi-Type Antenna With CPW-to-CPS Transition

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5 Author(s)
Yang Ding ; National Key Laboratory, Antennas and Microwave Technology Xidian University, Xi'an, Shaanxi, China ; Y. C. Jiao ; P. Fei ; B. Li
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A novel coplanar waveguide-fed planar quasi-Yagi antenna for multiband operation is presented in this letter. The antenna consists of a basic quasi-Yagi element and a coplanar-waveguide-to-coplanar-strip (CPW-to-CPS) transition, which can excite the odd-mode electric fields at the CPS line though the CPW feed line. The proposed antenna can be used in multiband operation with directional radiation patterns whose front-to-back ratios approximate to 10 dB for desired bands. Its impedance bandwidth, determined by -10-dB reflection coefficient, covers numbers of present wireless communication systems, and the antenna can be simply integrated with other circuit components for its planar structure. Experimental data obtained from a laboratory prototype are also presented. The experimental results confirm the good performances observed by the electromagnetic simulations.

Published in:

IEEE Antennas and Wireless Propagation Letters  (Volume:10 )