Abstract
The microwave wireless power transfer (MWPT) technology has found a variety of applications in consumer electronics, medical implants and sensor networks. Here, instead of a magnetic resonant coupling wireless power transfer (MRCWPT) system, a novel MWPT system based on a frequency reconfigurable (covering the S-band and C-band) microstrip patch antenna array is proposed for the first time. By switching the bias voltage-dependent capacitance value of the varactor diode between the larger main microstrip patch and the smaller side microstrip patch, the working frequency band of the MWPT system can be switched between the S-band and the C-band. Specifically, the operated frequencies of the antenna array vary continuously within a wide range from 3.41 to 3.96 GHz and 5.7 to 6.3 GHz. For the adjustable range of frequencies, the return loss of the antenna array is less than −15 dB at the resonant frequency. The gain of the frequency reconfigurable antenna array is above 6 dBi at different working frequencies. Simulation results verified by experimental results have shown that power transfer efficiency (PTE) of the MWPT system stays above 20% at different frequencies. Also, when the antenna array works at the resonant frequency of 3.64 GHz, the PTE of the MWPT system is 25%, 20.5%, and 10.3% at the distances of 20 mm, 40 mm, and 80 mm, respectively. The MWPT system can be used to power the receiver at different frequencies, which has great application prospects and market demand opportunities.
Highlights
The power supply technology used for various electronics is important, and the conventional power supply technology is provided by using cables, which can be hazardous, inconvenient, or impossible [1,2]
Instead of a magnetic resonant coupling wireless power transfer (MRCWPT) system, a novel microwave wireless power transfer (MWPT) system based on a frequency reconfigurable microstrip patch antenna array is proposed for the first time to power the receiver at the different frequencies
The gains of the antenna array are relatively stable within the range of the frequency
Summary
The power supply technology used for various electronics is important, and the conventional power supply technology is provided by using cables, which can be hazardous, inconvenient, or impossible [1,2]. For the above mentioned WPT systems, receivers only catch the energy at a single frequency, regardless of their demands This may cause malfunctions and failures, and the PTE of the system may be reduced. In the reference [24], a new approach based on reconfigurable magnetic resonant structures is proposed to achieve high energy efficiency and low volt-amp ratings. This basic principle is to create more than one efficiency-load curve. Instead of a MRCWPT system, a novel MWPT system based on a frequency reconfigurable (covering the S-band and C-band) microstrip patch antenna array is proposed for the first time to power the receiver at the different frequencies.
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