Alnahwi, F.M.Al-Yasir, Yasir I.A.Ali, N.T.Gharbia, IbrahimSee, C.H.Abd-Alhameed, Raed2022-08-052022-08-242022-08-052022-08-242022-08Alnahwi FM, Al-Yasir YIA, Ali NT, Gharbia I, See CH and Abd-Alhameed RA (2022) ' Compact Wideband Circularly Polarized Planar Monopole Antenna with Axial Ratio Bandwidth Entirely Encompassing the Antenna Bandwidth. IEEE Access. 10: 81828 - 81835.RMSID:212692878http://hdl.handle.net/10454/19111YesThe antenna presented in this study is a compact wideband monopole with wideband circular polarization that can be used across the whole antenna bandwidth. A rectangular C-shaped patch is partially covered by a ground plane in the proposed planar monopole antenna. Inserting a rectangular stub to the ground plane, etching a slit at the antenna patch, and adding a semicircular stub at the top of the antenna feed line increase the antenna impedance bandwidth (BW) and axial ratio bandwidth (ARBW). An FR4 substrate with overall dimensions of 25 mm×25 mm×1.6 mm is used to create the antenna. The antenna's observed impedance BW is 70% (4.55 GHz in the 4.3-8.85 GHz band), while the measured broadside ARBW is improved to a value of 82.2 percent (5.3 GHz along the range 3.8-9.1 GHz). The impedance BW is perfectly covered by the ARBW; hence the antenna can be considered circularly polarized throughout its operational spectrum. Within the antenna BW, the measured gain is greater than 1.5 dB.en©2022, The Authors. Published by IEEE. This work is licensed under a Creative Commons Attribution 4.0 License.Axial ratioCircular polarizationPlanar antennaWidebandArticlehttps://doi.org/10.1109/ACCESS.2022.3196610CC-BY2022-08-05