Abstract
Abstract In this paper, a compact circularly polarized metamaterial patch antenna using cross aperture-coupled feed is proposed. The CP antenna utilizes the 1 mode that is induced by the composit right-left handed(CRLH) transmission line. Since the 1 mode has the same properties with the TM 010 mode of the conventional patch antenna, the circular polarization(CP) can be realized [1] . If two orthogonal modes are excited with 90° phase difference, the CP property can be obtained. In order to obtain two orthogonal modes and 90° phase difference, 4 mushroom structures having the shape of square are employed. The width and length of the cross aperture are optimized through the design algorithm. The fabricated antenna is based on RT/duroid5880 substrate and the total area of the 4 mushroom is 0.25 × 0.25 . The center frequency of the LHCP(Left-Handed Circular Polarization) antenna is measured as 1.622 GHz and circular polarization bandwidth(3 dB) is measured as 3 MHz. The center frequency of the RHCP(Right-Handed Circular Polari-zation) antenna is measured as 1.609 GHz and circular polarization bandwidth (3 dB) is measured as 3 MHz, respectively. The measured radiation efficiency of LHCP antenna is 61.1 % and the measured radiation efficiency of RHCP antenna is 54.5 %.Key words: Metametrial, Composit Right-Left Handed(CRLH), 1 Mode, Cross Aperture, Circular Polarization(CP) mZ2013nopjq(rstOSnq)3u v +wxuy39 z{A|Gx}(No. NRF-2013R1A2A2A05005640)~ gn j nS(Department of Electronic Information and Communication Engineering, Hongik University) Manuscript received October 28, 2013 ; Revised February 3, 2014 ; Accepted February 10, 2014. (ID No. 20131028-103)Corresponding Author: Jeong-Hae Lee (e-mail : jeonglee@hongik.ac.kr)
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