A vertex-fed hexa-band frequency reconfigurable antenna for wireless applications

Present article embodies the design and analysis of an octagonal shaped split ring resonator based multiband antenna fed at vertex for wireless applications with frequency-band reconfigurable characteristics. The proposed antenna is printed on FR4 substrate with electrical dimension of 0.4884 lambda x 0.4329 lambda x 0.0178 lambda (44 x 39 x 1.6 mm(3)), at lower frequency of 3.33 GHz. The antenna consists of SRR based vertex fed octagonal ring as the radiation element and switchable reclined L-shaped slotted ground plane. Antenna achieves six bands for wireless standards viz: upper WLAN (5.0/5.8 GHz), lower WiMAX (3.3 GHz), super extended C-band (6.6 GHz), middle X band (9.9 GHz-for space communication), and lower K-U band (15.9 GHz-for satellite communication systems operating band). Stable radiation patterns are observed for the operating bands with low cross polarization. The proposed design achieves hexa band characteristics during switching ON state of PIN diode located at reclined L-shaped slot in the ground plane. Experimental characteristic of antenna shows close agreement with those obtained by simulation of the proposed antenna.