UWB monopole antenna with circular polarization

Abstract

Abstract In this article, ultra‐wideband (UWB) monopole antenna with circular polarization (CP) is designed and implemented. The proposed antenna consists of an asymmetric shaped radiator fed by a microstrip line and a limited ground plane on the back side of the substrate. The overall size of proposed antenna is 28 mm × 29 mm, which is suitable for mobile devices. The antenna is fabricated on inexpensive FR4 a dielectric constant of, loss tangent tan δ = 0.019 with thickness of 1.6‐mm. The measured results show that the proposed monopole antenna has a very wide bandwidth from 2.98 to 10.93 GHz that covers the UWB application range and defined by 10‐dB return loss. Furthermore, a very wide CP bandwidth of 3‐dB axial ratio bandwidth that ranges from 7.18 to 10.01 GHz is achieved. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:949–953, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26741