A Compact ACS-Fed Triple-Band Dual-Polarized Stubs-Loaded Frequency Reconfigurable Printed Antenna for WiMAX and WLAN Applications

An ACS-fed dual-polarized stubs-loaded frequency reconfigurable printed antenna for multiband operation is presented and designed on FR-4 substrate. The antenna is composed of an inverted U-shaped stub and two asymmetrical L-shaped stubs connected in branched manner with ACS-fed. The antenna provides circular polarization (CP) functionality in the 4.9 GHz public safety WLAN band. The predicated impedance bandwidths of 260 MHz (2.32-2.58 GHz), 640 MHz (3.51-4.15 GHz), 480 MHz (4.94-5.42 GHz) and axial ratio bandwidth (ARBW) of 320 MHz (4.95-5.27 GHz) is achieved for 2.4/5.2 GHz WLAN, 3.5/5.5 GHz WiMAX and 4.9 GHz public safety WLAN applications. By employing three diodes at different locations on stubs and changing states of diodes, frequency reconfiguration functionality is achieved while keeping antenna size 14.70×26.50 mm
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. Gain, axial ratio and radiation pattern for the antenna are analyzed and presented in the paper.