Abstract
Various methods have been proposed to control the electromagnetic fields in the near-or far-field region, one of which is to use antenna arrays. This paper reviews a technique, called the method of maximum power transmission efficiency (MMPTE), for the design of antenna arrays and wireless power transmission (WPT) systems. The method is motivated by the fact that all wireless systems aim to maximize the power transmission efficiency (PTE) between the transmitter and receiver and the PTE can thus be considered as a performance index for the design of WPT system and antenna as well. The MMPTE makes use of the PTE as the performance index to be optimized, and reduces a field synthesis problem into a circuit analysis problem, and is therefore easy to master and implement. It overcomes all the challenges associated with conventional array design methods, and is applicable to the design of any type of antenna array in any environment. This paper summarizes the basic theory of MMPTE and demonstrates MMPTE through a number of near- and far-field applications, including focused antennas, smart antennas, shaped beam antennas, end-fire antennas, multi-beam antennas, polarization-reconfigurable antennas, and wireless power transmission systems.
Highlights
I N MICROWAVE frequency regime, antenna arrays are often used to realize desired radiation patterns in the far-field region [1], [2]
We present a systematical review of an optimization technique for the design of antenna arrays and wireless power transmission (WPT) systems which can overcome the aforementioned challenges, called the Method of Maximum Power Transmission Efficiency (MMPTE)
By introducing a test Rx array, the optimal design of an antenna array can be converted to the optimal design of a WPT system
Summary
I N MICROWAVE frequency regime, antenna arrays are often used to realize desired radiation patterns in the far-field region [1], [2]. The conventional methods for antenna pattern synthesis are problem specific and rely on certain simplifications in order to reduce the complexity of the optimization process. A field synthesis method based on a prescribed field distribution on a closed surface enclosing the antenna array has been provided in [3]. We present a systematical review of an optimization technique for the design of antenna arrays and wireless power transmission (WPT) systems which can overcome the aforementioned challenges, called the Method of Maximum Power Transmission Efficiency (MMPTE). In order to achieve a desired field pattern in the near- or far-field region, a performance index (target function) is usually introduced and optimized during the design of antenna. For the design of a wireless system intended either for the transmission of information or power, a natural performance index is the power transmission efficiency (PTE) between the transmitting (Tx)
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