Design of reconfigurable compact dual polarized antenna for multiband operation

A compact coplanar waveguide (CPW)-fed F-shaped stub printed antenna is presented. The first and second resonance modes are excited due to F-shaped stub connected to modified CPW ground plane and third resonance mode due to modified L-shaped CPW feeding. The impedance bandwidths of 190 MHz (2.06–2.25 GHz) for UMTS band, 530 MHz (4.61–5.14 GHz) for 4.9 GHz public safety WLAN, 1490 MHz (5.45–6.94 GHz) for 5.5 GHz WiMAX, 5.8 GHz WLAN, and ITS (intelligent transport systems) bands application is achieved. The proposed antenna provides circular polarization (CP) in the 4.9 GHz public safety WLAN band with 3-dB axial ratio (AR) bandwidth of 170 MHz (4.88–5.05 GHz) and linear polarization in the other two bands. By employing a single switch between F-shaped arms and changing the state of switch, antenna exhibits narrowband and wideband functionality with dual- and triple-band behaviour while keeping antenna size 25 × 25 mm
²
.