@article { , title = {A Compact Wideband Circularly Polarized Planar Monopole Antenna with Axial Ratio Bandwidth Entirely Encompassing the Antenna Bandwidth}, abstract = {The 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.}, doi = {10.1109/ACCESS.2022.3196610}, journal = {IEEE Access}, pages = {81828-81835}, publicationstatus = {Published}, publisher = {Institute of Electrical and Electronics Engineers}, url = {http://researchrepository.napier.ac.uk/Output/2892134}, volume = {10}, keyword = {Acoustics, Internet of Things, Optimisation and learning, Sensors, Smart cities, Engineering Research Group, AI and Technologies, Culture and Communities, Axial Ratio, circular polarization, planar antenna, wideband}, year = {2024}, author = {Mousa, Falih M. and Al-Yasir, Yasir I. A. and Ali, Nazar T. and Gharbia, Ibrahim and See, Chan Hwang and Abd-Alhameed, Raed} }