Abstract
A novel low profile planar antenna based on composite right/left-handed transmission line (CRLH-TL) on the carved circuit board is investigated. The CRLH-TLs are presented as the general transmission lines possessing both left-handed (LH) and right-handed (RH) natures. The offered antenna has been fabricated of four composite right/left-handed unit cells, each of which occupies the space of 0.004λ0 × 0.01λ0 × 0.001λ0, where λ0 is free space wavelength at 0.5 GHz. The proposed antenna can be applied for the experimental frequency band of 0.5–5.5 GHz, related to 166.6% practical bandwidth. Also, the antenna exhibits measured gains and radiation efficiencies of 4.1 dBi and 62.7%, 7.2 dBi and 85.4%, and 5.8 dBi and 72.6% at 0.5, 3, and 5.5 GHz, respectively. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:27–31, 2016
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