Abstract
For microwave power transmission (MPT), the transmitting (Tx) array with a tapered amplitude distribution can achieve a maximum beam collection efficiency, but it needs a feeding network with an arbitrary power division ratio; thus, it is complicated and costly in practical applications. This work explores realizing high transmission efficiency by a Tx array with the equal-ratio steps amplitude distribution (ERSAD). By using the ERSAD, the amplitude value of the central units of the Tx array is uniform, and the amplitude feeding of the edge units only needs equal power divisions. Thus, the amplitude feeding is greatly simplified. Besides, a compensated phase distribution is used to focus the radiating beam on the receiving aperture. To validate the proposed design, a Tx antenna consisting of 8 × 8 units with a total aperture size of 1 × 1 m2 is designed. The operating frequency and the focused distance are 5.8 GHz and 10 m, respectively. A 64-way microwave power source is used to adjust the amplitude and the phase of the Tx array, and an MPT experiment is conducted. The measurement shows that, compared with the 10 dB Gaussian amplitude array, the proposed array nearly has the same transmission efficiency against different receiving apertures.
Highlights
Microwave power transmission (MPT) is a wireless energy transmission technology with microwaves, which has great application potential in solar power satellites (SPSs),1,2 energy supplies of near-space aerocraft, unmanned aerial vehicles,3,4 etc.5,6 An MPT system usually consists of a microwave source, a transmitting (Tx) antenna, a receiving (Rx) antenna, and a rectifying circuit
Tx antennas of most MPT systems are designed with equal amplitude and in-phase to realize the maximum gain in far-field, but actual MPT systems are commonly worked at the nearfield
Based on our previous work,6 this paper explores a highefficiency near-field focused Tx antenna with equal power divisions
Summary
Microwave power transmission (MPT) is a wireless energy transmission technology with microwaves, which has great application potential in solar power satellites (SPSs), energy supplies of near-space aerocraft, unmanned aerial vehicles, etc. An MPT system usually consists of a microwave source, a transmitting (Tx) antenna, a receiving (Rx) antenna, and a rectifying circuit. Much research has shown that the Tx array with tapered amplitude distribution can realize maximum BCE.. Gaussian amplitude distribution (GAD) is one of the best taper designs.. It is shown that all of these projects are designed with 10 dB Gaussian amplitude distribution.. The amplitude of Gaussian distribution is continuous from the center to the edge; large numbers of different kinds of amplifiers or attenuators are needed, which make actual large MPT systems costly and complicated. Tx antennas of most MPT systems are designed with equal amplitude and in-phase to realize the maximum gain in far-field, but actual MPT systems are commonly worked at the nearfield.. By compensating the phase difference, the microwave power radiating from the Tx antenna can be focused on the Rx Near-field focused technologies are proposed to solve the problem. By compensating the phase difference, the microwave power radiating from the Tx antenna can be focused on the Rx
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