Abstract
In this paper, a novel construction of a wideband slotted monopole antenna supplied by a single coplanar waveguide (CPW) with circular polarization (CP) characteristic for the small wireless device is proposed and discussed. The circular polarized CPW antenna is intended for the Industrial Scientific Medical (ISM) band spanning at 2.45 GHz. It consists of a monopole-shaped patch with two oppositely facing corner gaps extending from the CPW signal strip into the middle of a square metal frame serving as the ground, incorporates a couple of L-shaped grounding strips surrounding two oppositely facing corners of the ground, and an L slot in the topside of the ground plane. The bandwidth of the antenna’s input impedance is widened through reconfiguring the necessary parameters of the reversed L-shaped grounding strips. The circularly polarization can be significantly achieved through cutting an upturned L-slot mostly in the topmost half of the ground. The proposed antenna has a size of 60600.74mm3. Two electromagnetic solvers have been used to examine and to optimize the proposed circuit. The final circuit of the circularly polarized CPW monopole antenna is fabricated and validated by measurements. The measured bandwidth concerning the return loss at -10 dB is about 1.30 GHz and for the axial ratio at 3 dB, it’s about 500 MHz.
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