Abstract
Background/Objectives: To develop Circular Polarized (CP) patch antenna with improved bandwidth and harmonic suppression for RF energy harvesting system. Methods/Statistical analysis: 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. Findings/Applications: 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. Novelty/Applications: 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. Keywords: RF energy harvesting; microstrip patch antenna; harmonic suppression; circular polarization
Highlights
With the development of antenna technology, one of the focusing issues nowadays is integrating antennas and filters
Effect of coupling gap (d) can be observed in [ Figure 5 ], which indicates that the gap is important parameter of the proposed Circular Polarized (CP) patch antenna for wider bandwidth
3.3 Effect of resonator length (Lr) on return loss The effect of resonator length (Lr) can be observed in [ Figure 6 ], which indicates that the resonator length is important parameter of the proposed CP patch antenna for controlling resonating frequency
Summary
With the development of antenna technology, one of the focusing issues nowadays is integrating antennas and filters. Suppressing the wideband high order harmonic attracts more and more researchers’ attention. Integrating filter at input front end of antenna is the common method to suppress high order harmonics [1]. Applying filters can contribute to other issues such as increasing the size, weight, and cost of the wireless device. In this way, some alternative solutions that do not increase cost or complexity for the device can be attractive. Solutions that use the antenna itself to filter these higher-order modes become interesting [2,3]
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