Abstract
In this work a wideband frequency reconfigurable Dielectric Resonator antenna (DRA) for WIMAXlWLAN and WBAN applications has been communicated. The reconfigurable antenna comprises of Coplanar Waveguide where ground plane and feedline are on the same surface. The DRA has been reduced to inverted U-shape for the sake of size miniaturization. The proposed design has the potential to reconfigure the frequencies at four different wide bands. The frequencies are tuned between 3.23 GHz to 6.32 GHz. The DRA has a dielectric constant (er) of 10 and is positioned on the ground plane with substrate of FR4 material, which has a dielectric constant of 4.3 and 1.6mm thickness. The overall dimensions of the design are 56χ55 mm2. Two ideal switches are positioned on the extended feedline to DR. Because of these two switches, three switching operations are performed, i.e, ON-ON, ON-OFF, OFF-ON. Because of these three switching operations, four wide bands are achieved. When switches are in ON-ON state, the impedance bandwidth is 48.88%. When switches are in ON-OFF state, two wide bands are achieved with 6% and 30.44 % impedance bandwidth respectively. For the third arrangement, when switches are in OFF-ON state, the impedance bandwidth is 28.88%. The proposed design is low profile with 1.635 mm height of the DR. Simulated results of the proposed design strongly support the design for the mentioned wireless applications.
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