A Dual Band, Dual Polarized Slot Antenna Using Coplanar Waveguide
This letter presents a multiband antenna exhibiting dual polarization characteristics. The antenna consists of a circular-shaped slot etched in the ground plane. A rectangular patch is inserted in the slot energized by CPW feed. Three conducting strips are attached to the radiating patch on either side of the feed line along with a circular slot notched on the patch for introducing asymmetric excitation. Further, a number of rectangular slits are embedded in the ground plane protruding into the circular slot for achieving dual polarization characteristics. Asymmetric excitation results in generation of circular polarized radiations for the lower band while the upper band remains linearly polarized. Overlapping lower band i.e. S11 < ‒10 dB and Axial ratio <3 dB extends from 2.33 to 3.90 GHz while the linear polarized upper band extends from 5.4 to 6.3 GHz thereby proposed antenna covering Bluetooth and WLAN usable bands by dual resonating bands.
KeywordsCoplanar waveguide Dual polarized Slot antenna Circular slot Dual band