Bandwidth Enhancement of Circular Patch Antenna Through Reflective Excitation Technique

With the advancement in wireless communication technology towards 5G and higher generations, researchers have invested much efforts towards attaining high bandwidth communication. Bandwidth of a circular patch antenna and its overall performance has been enhanced using a novel reflective technique proposed in this paper. By exciting the patch antenna reflectively through a metallic post connected to an ungrounded coplanar waveguide (CPW) line terminated with a pair of vias attached to the line by a metallic pad, another resonance is generated near the fundamental mode, significantly improving impedance bandwidth. The bandwidth of the proposed radiator is enhanced by 387.7% when compared with that of a probefed circular patch antenna (from 6.61% to 30.11%) using the proposed technique. A radiation efficiency >90% was attained for the antenna structure mentioned in this work. The progress of the proposed design from a conventional circular patch to that of a bandwidth enhanced patch is also discussed.