A new broadband circularly polarized (CP) square slot antenna is evaluated numerically and verifled experimentally. The proposed antenna uses a lightening-shaped feedline protruded from the signal line of the feeding coplanar waveguide (CPW). Two symmetrical F-shaped slits embedded in opposite corners of ground plane are designed to obtain an excellent CP bandwidth. By adjusting the dimensions of the lightening-shaped feedline, the CP bandwidth can be further enhanced. Measured results show that the 3dB axial- ratio bandwidth of the proposed antenna can reach 51.7% (2150MHz{ 3650MHz), and the impedance bandwidth is as large as 60.2% (2150MHz{4000MHz) with VSWR • 2. Measured results are in good agreement with the simulation. The proposed antenna can be easily fabricated because of the simple coplanar geometry.
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Liao et al. (2010) studied this question.
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