The design is described of a coplanar-waveguide (CPW)-fed circularly polarized slot antenna. The slot antenna and the feeding structure are fabricated on the same plane of the substrate so that circuit process and position alignment could be simplified. By etching a longitudinal slot at a middle point of a stair-shaped slot and tuning geometrical parameters, two orthogonal electric fields with quadrature phase difference excite a circularly-polarized wave. A bandwidth of 31.2% (2.30-3.15 GHz) is achieved with an axial ratio 3 dB and reflection coefficient 10 dB. Details of the design procedure for the proposed antenna are described, and the results of the antenna performance are presented and discussed.Index Terms-Circularly polarized, orthogonal electric field, quadrature phase difference, stair-shaped slot.
ABSTRACT:A microstrip-fed loop-like antenna designs with circular polarization (CP) is presented in this paper. The proposed loop-like antenna comprised of a monopole antenna, a sleeve strip connected with the ground plane and an L-shaped slit embedded in the ground plane. The C-like monopole generates a resonant mode for wideband impedance-bandwidth at the GPS and DCS bands, and the sleeve and the slit are capable of exciting two orthogonal electric fields with equal amplitude and phase difference of 90 degree for radiating circular polarization at 1.575 GHz. Both simulated and measured results are provided to validate the CP performance of the proposed antenna.
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