Electrically Small and Low Cost Smart Antenna for Wireless Communication

Liu, H. and Gao, S. and Loh, T. (2012) Electrically Small and Low Cost Smart Antenna for Wireless Communication. IEEE Transactions on Antennas and Propagation, 60 (3). pp. 1540-1549. ISSN 0018-926X . (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1109/TAP.2011.2180300

Abstract

A compact low-cost low-power smart antenna has been proposed in this paper. To reduce the cost and power consumption,it employs the structure of an Electronically Steerable Parasitic Array Radiator (ESPAR) antenna. To reduce the size of the antenna, a top-disk loaded monopole and six folded monopoles are employed as the driven element and parasitic elements, respectively. The proposed antenna is called “folded monopole ESPAR antenna”. The heights of the top-disk loaded monopole and folded monopoles are reduced to be less than . Furthermore, the radius of the folded monopole ESPAR antenna is reduced by using capacitive loading technique. An equivalent circuit model is proposed for analyzing the antenna. To validate the concept, a prototype is developed and the antenna operates from 2.3 GHz to 2.55 GHz. The measured results confirm that the folded monopole ESPAR antenna can achieve electronically beam scanning in horizontal plane over a 360 range. The prototype antenna achieves a gain of 4.0 dBi and a front-back ratio of 20 dB. The parasitic elements are loaded by varactors and beam forming is achieved by controlling the DC voltages applied to the varactors.

Item Type: Article
Uncontrolled keywords: beam forming, bean steering, ESPAR, small antenna, smart antenna
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics (see also: telecommunications) > TK7871.6 Antennas and waveguides
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: J. Harries
Date Deposited: 04 Sep 2012 13:50
Last Modified: 05 Mar 2013 16:42
Resource URI: http://kar.kent.ac.uk/id/eprint/30437 (The current URI for this page, for reference purposes)
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