Broadband circular polarized patch antenna with harmonic suppression

Abstract

<h2>Abstract</h2> <p><strong>Background/Objectives:</strong> To develop Circular Polarized (CP) patch antenna with improved bandwidth and harmonic suppression for RF energy harvesting system. <strong>Methods/Statistical analysis:</strong> A l /4 resonator is introduced and coupled in proximity to the radiating patch for bandwidth enhancement and high order harmonic suppression. Compared with other dual-resonance patch antennas, the proposed antenna has attractive low-profile property and simple structure. The CP can be achieved by putting arc shape slits at edge of circular patch. The structure, working principle and results we are described. <strong>Findings/</strong><strong>Applications:</strong> The operating bandwidth is from 1.68 GHz to 2.95 GHz (52.91%) with a reflection coefficient less than -10 dB with Axial Ratio bandwidth of 550MHz (2.21 GHz -2.76 GHz) while harmonic suppression over wide frequency range from 1 to 12 GHz is achieved. The experimental and simulated results is good matching except some slight variation. <strong>Novelty/Applications:</strong> New techniques for both bandwidth enhanced and harmonic suppression and up to 4th higher order harmonics has been suppressed. Proposed structure offers wideband CP Antenna with harmonic suppression.</p> <p><strong>Keywords:</strong> RF energy harvesting; microstrip patch antenna; harmonic suppression; circular polarization</p>