Dual Band Circular Patch Antenna for RFID and Ultrawideband Applications

This paper presents a dual-band microstrip patch antenna for radio frequency identification (RFID) and ultrawideband (UWB) applications. It comprises a circular radiator, modified 90° bent microstrip feed line and modified coplanar waveguide feed ground plane. The proposed has two operating bands ranging from 2.27-2.32 GHz for RFID and 4.13-24.18 GHz for UWB applications. The designed antenna has electrical dimensions of
$0.18\ \lambda_{\mathrm{L}}\times 0.21\ \lambda_{\mathrm{L}}$
(where
$\lambda_{\mathrm{L}}$
is the wavelength at the lowest operating frequency of 2.27 GHz). The radiation patterns are stable and omnidirectional in nature. The simulation has been carried out by using ANSYS HFSS v21 and CST MWS. The results of both the software are in close agreement with each other.