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Electrically small and low cost smart Antenna for wireless communications.

Liu, H-T*; Gao, S*; Loh, T H (2012) Electrically small and low cost smart Antenna for wireless communications. IEEE Trans. Antennas Propag., 60 (3). pp. 1540-1549.

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A compact-size low-cost low-power electronically beam-steering smart antenna that covers frequency from 2.3 GHz to 2.6 GHz has been proposed. To reduce the cost and power consumption, it employs the structure of Electronically Steerable Parasitic Array Radiator (ESPAR) antenna. To reduce the size of conventional ESPAR antenna, the top-disk loaded monopole and folded monopoles are employed as the driven element and parasitic elements, respectively. The antenna proposed is called ¿folded monopole ESPAR antenna¿. The heights of the top-disk loaded monopole and folded monopole have been reduced to be less than , i.e., a 150% reduction compared to that of conventional ESPAR antenna. Furthermore, the radius of the ESPAR module, has been reduced by using the capacitive loading technique. An equivalent circuit model has been developed for analyzing this antenna. The folded monopole ESPAR antenna achieves a gain of 4.0 dBi and a front-back ratio of 20 dB. Parasitic elements are loaded by varactors and the beam forming has been achieved by controlling the DC voltages applied over varactors.

Item Type: Article
Keywords: smart antenna, ESPAR, beam forming, small antenna
Subjects: Electromagnetics
Electromagnetics > Wireless Communications
Identification number/DOI: 10.1109/TAP.2011.2180300
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5421

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