open access

https://hdl.handle.net/2115/50092

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

英語

size 20 mm

2012-08-02

Institution of Engineering and Technology

Electronics Letters

48(16)

971-972

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.

学術雑誌論文

Accepted Manuscript

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

0013-5194