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2.45 GHz high-gain electrically small antenna with composite right/left-handed ladder structure

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タイトル: 2.45 GHz high-gain electrically small antenna with composite right/left-handed ladder structure
著者: Takahagi, K. 著作を一覧する
Otsu, Y. 著作を一覧する
Sano, E. 著作を一覧する
キーワード: high-gain electrically small antenna
composite right/left-handed ladder structure
antenna gain
Harrington limit
impedance matching
dipole antenna
lumped-component loading left-handed antenna
composite right/left-handed transmission line theory
T-junction balun
frequency 2.45 GHz
size 20 mm
発行日: 2012年 8月 2日
出版者: Institution of Engineering and Technology
誌名: Electronics Letters
巻: 48
号: 16
開始ページ: 971
終了ページ: 972
出版社 DOI: 10.1049/el.2012.0770
抄録: Electrically small antennas are needed to further lower the cost of wireless elements. However, the antenna gain is constrained to the Harrington limit, while the impedance matching and directivity characteristics deteriorate in electrically small antennas. Using a dipole antenna loaded with a left-handed ladder structure is a promising technique for reducing the size of antennas. In this letter, we designed a lumped-component loading left-handed antenna on the basis of the composite right/left-handed transmission line theory. A 4-unit cell left-handed dipole antenna with a size of 20 mm (0.16λ0) was fabricated with a T-junction balun. The actual gain of the fabricated antenna was - 0.01 dBi, which was about 1 dB lower than the Harrington limit and the highest ever achieved for fabricated antennas operating at around 2.45 GHz (kr = 0.502). The directivity measured in the E-plane was similar to that of typical half-wavelength dipole antennas.
Rights: This paper is a postprint of a paper submitted to and accepted for publication in Electronics Letters and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 佐野 栄一


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