A wideband circularly polarized L-shaped monopole slot antenna (10) has a single C- shaped feed (22). A ground plane (14) is formed on a substrate (12) and includes the monopole slot antenna (10) having a vertical slot (16) and a horizontal slot (18). The C- shaped feed (22) is formed on the other side of the substrate (12). The antenna has 23% of measured circular polarization bandwidth (Axial Ratio 3 dB and Return Loss 10 dB). The monopole slot antenna occupies a half area on the corner of circuit board compared to a conventional half-wavelength slot antenna. This feature is attractive for compact wireless devices operate at low frequencies in which circuit board floor planning and signal routing are major concerns. The antenna does not require any cost increasing truncation corners, reflector surfaces or via connections.
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