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Optically controlled reconfigurable band-notched UWB antenna for cognitive radio systems

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Details

Original languageEnglish
Pages (from-to)1502-1504
Number of pages3
JournalElectronics Letters
Volume50
Issue number21
DOIs
Publication statusPublished - 9 Oct 2014
Publication typeA1 Journal article-refereed

Abstract

A compact optically controlled ultra-wideband (UWB) antenna with reconfigurable band-notched characteristics is investigated for cognitive radio (CR) applications. The rejection mechanism is realised by etching one symmetric folded slot on the U-shaped radiation patch and the essence of the reconfigurable function is achieved by laser controlling photoconductive switches to change the effective length of the folded slot. A prototype with an overall size of 25 × 25 × 0.8 mm3 is designed and constructed. On the basis of simulated and measured results, the proposed antenna exhibits good radiation behaviour and operates in a wide band with the performance of switchable band rejection of the wireless local area network (WLAN) 2.4 GHz (2.2-2.9 GHz), worldwide interoperability for microwave access (WiMAX) (3.2-4.7 GHz), WLAN 5 GHz (4.8-6.6 GHz) and the ITU 8 GHz (7.5-8.7 GHz).

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