Abstract
In this paper, a coplanar waveguide (CPW)-fed circular ultra-wideband (UWB) antenna is reported. The antenna is designed, simulated, fabricated, and tested experimentally. The antenna operates over a 3.8-30 GHz (155% fractional bandwidth) range with a return loss of 10 dB or more and voltage standing wave ratio (VSWR) < 2. The designed monopole antenna is of dimensions 33.1 mm x 33.84 mm with an electrical size of 0.42 λ x 0.43 λ at 3.8 GHz frequency. The antenna is fabricated on Kodak 4-Star photo paper with a dielectric permittivity of 2.85, loss tangent of 0.05, and a thickness of 0.254 mm. Fujifilm Dimatix 2831 was used as the inkjet printer. The designed antenna exhibits nearly omnidirectional radiation patterns over the entire impedance bandwidth. Considering the miniature size, higher operating bandwidth, and flexible characteristics of the substrate the presented antenna can be used for Internet of Things (IoT) applications.
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