An electrically small CPW fed frequency reconfigurable antenna

In this paper, an electrically small reconfigurable antenna fed by a co-planar waveguide(CPW) is proposed. The resonance is achieved by providing an extra path for current through additional meander lines which are attached with the main feed line. Two PIN diodes are used to reconfigure the antenna from 4.27 GHz to 3.56 GHz. The proposed antenna measures only 14.5 × 12.8 mm² and is printed on a low loss 1.524 mm thick Rogers TMM4 laminate with a dielectric constant of 4.5 and a loss tangent of 0.002. The antenna has an omnidirectional radiation pattern at both switching frequencies with a peak gain of 1.3 dBi at 4.27 GHz and 0.2 dBi at 3.56 GHz. The proposed antenna is suitable for WIMAX and indoor wireless applications.