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

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Title: 2.45 GHz high-gain electrically small antenna with composite right/left-handed ladder structure
Authors: Takahagi, K. Browse this author
Otsu, Y. Browse this author
Sano, E. Browse this author →KAKEN DB
Keywords: 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
Issue Date: 2-Aug-2012
Publisher: Institution of Engineering and Technology
Journal Title: Electronics Letters
Volume: 48
Issue: 16
Start Page: 971
End Page: 972
Publisher DOI: 10.1049/el.2012.0770
Abstract: 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
Type: article (author version)
Appears in Collections:量子集積エレクトロニクス研究センター (Research Center for Integrated Quantum Electronics) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐野 栄一

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