Broadband Circularly Polarized Planar Slot Antenna for Bluetooth/WiMAX Application
A wideband circular polarized slot antenna using coplanar waveguide feed (CPW) technique is presented in this work. A rectangular slot is created in the ground plane and an asymmetric patch residing in the rectangular slot is fed by central signal strip. The rectangular slot is perturbed by a conducting stub embedded in the ground. Ground is further modified by etching a few rectangular slots in it aiming at broadband circular polarized behavior. A grounded metallic arm of L-shape is incorporated in the structure which improves the axial ratio bandwidth of the proposed antenna. The proposed antenna provides an overlap band, i.e., S11 < –10 dB and axial ratio <3 dB from 1.83 to 3.37 GHz which provides a large axial ratio bandwidth of greater than 1.5 GHz for which antenna exhibits circularly polarized behavior thereby covering Bluetooth and WiMAX usable bands.
KeywordsCoplanar waveguide Wideband Circular polarized
- 5.Sze, J.-Y., Hsu, C.-I.G., Chen, Z.-W., Chang, C.-C.: Broadband CPW-fed circularly polarized square slot antenna with lightening-shaped feedline and inverted-L grounded strips. IEEE Trans. Antennas Propag. 58(3), 973–977Google Scholar