Reconfigurable hexagon shaped printed antenna for cognitive radio application

摘要

The article presents a new reconfigurable antenna suitable for cognitive radio(CR) application under interweave paradigm. The new sleeve-like geometry isimprovised in the antenna for designing broadband sensing antenna and itconsists of a hexagon shaped metallic patch along with modified coplanar groundplane structure and feed line (nonconventional coplanar waveguide feed).The p-i-n diodes are also incorporated with the printed antenna. By varyingthe switching states of the diodes, frequency hopping occurs over the frequencyrange 3.75 to 12.67 GHz (108.64% BW) which is better compared to theexisting sensing antennas used for designing CR antenna. The antenna alsooffers suitable gain and omnidirectional radiation pattern over the operatingrange of frequencies. In addition to frequency domain analysis, time-domainsynthesis of the proposed antenna is also executed by using well-known electromagneticsolver CST software. Moreover, the antenna is fabricated andmeasured parameters are in good accordance with measured results.