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An integrated "sense-and-communicate" broad-/narrow-band optically controlled reconfigurable antenna for cognitive radio systems

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Details

Original languageEnglish
Pages (from-to)1016-1023
Number of pages8
JournalMicrowave and Optical Technology Letters
Volume57
Issue number4
DOIs
Publication statusPublished - 1 Apr 2015
Publication typeA1 Journal article-refereed

Abstract

An optically controlled reconfigurable antenna with operability in both wide and narrow bands is investigated for cognitive radio systems. The proposed antenna consists of a U-shaped patch for the spectrum sensing over a wide band and two open annuli for communication in narrow sub-bands within the frequency range of 3.1-10.6 GHz. The integration of narrow and wide bands devices makes the whole antenna structure compact with a dimension of 40 × 38.5 mm2. With an inherent property of being electromagnetically transparency, four appropriately placed laser-controlled photoconductive silicon switches are adopted to achieve reconfigurable frequency characteristics in the four bands of 5.8-6.8, 6.7-7.3, 7.0-8.4, and 7.9-9.2 GHz with the reflection coefficient below -10 dB. The wide-narrowband antenna is fed by two coplanar waveguides with the isolation of S21

Keywords

  • cognitive radio, Frequency reconfigurable antenna, optical control, photoconductive switches