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Electrically small and low cost smart antenna for wireless communication.

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

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In this paper, a compact Electronically Steerable Parasitic Array Radiator (ESPAR) antenna that covers the frequency band from 2.3GHz to 2.6GHz is proposed. The top-disk loaded monopole and folded monopoles are employed to reduce the height of proposed ESPAR antenna. The height of top-disk loaded monopole and folded monopole have been reduced to be lower than 1/10 wavelength, much smaller than 1/4 wavelength, i.e. the height of traditional ESPAR antenna. Furthermore, the distance between the driven element and parasitic elements, i.e. the radius of the ESPAR module, is also reduced. An equivalent circuit model has been built for analyzing proposed ESPAR antenna. The proposed ESPAR module achieves a gain of 4.0dBi and a front-back ratio of 20dB despite its compactness. The beam forming is achieved by tuning the reactive load of the varactors series those parasitic elements surrounding the central driven element. A two-element array composed of proposed single ESPAR module is designed and measured. The two element array reports a maximum gain of 6dBi. A MIMO antenna composed of two folded monopole ESPAR modules is proposed and measured as well.

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/5455

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