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A Miniaturised Monopole Wideband Antenna with Reconfigurable Band Rejection for WLAN/WiMAX

Elfergani, I. ; Hussaini , A. ; See, C ; Rodriguez, J. ; Abd-Alhameed, R.A. Abd-Alhameed

A Miniaturised Monopole Wideband Antenna with Reconfigurable Band Rejection for WLAN/WiMAX, Proc ICST International Conf. on Wireless Internet - WICON, Lisbon, Portugal, Vol. , pp. 1 - 6, November, 2014.

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Abstract
This paper proposes a tuneable band-rejected miniaturised monopole antenna. The band-notching was achieved by printing an inner chorded crescent shape over the surface of the substrate. By placing a small varactor between the inner and outer arches, the centre frequency of each notch can be individually shifted downwards. The design of the proposed structure has a controllable rejection in the range from 2.38 to 3.87GHz maintaining a wideband performance from 1.5 to 5 GHz based on VSWR≤ 2. The antenna prototype was fabricated and tested. Simulated and measured results are performed and analysed. With a compact size, the proposed monopole antenna may well work as an internal antenna in a portable device.