This paper investigates wireless power transmission (WPT) system efficiency of antenna arrays in free space and in fully enclosed boxes with reflecting walls. In this study we investigate the WPT approach for both a uniform transmitting antenna array and a random array. Specifically, we consider 10 transmitting antennas (Tx) placed on two opposite walls of a cubical room and one receiving antenna (Rx) centered in the middle. We calculate the received (Rx) power for different array configurations. Simulation results show that randomness and the presence of reflecting walls provide significant enhancement to the system’s power transfer efficiency compared to the maximum efficiency achievable with a similar configuration in free space. Furthermore, the simulated power flow density shows multiple hotspots in space, making the system very dynamic with the advantage of random array over the linear array. This enables power delivery to a moving receiver and meets the demand of harvesting the wireless energy to charge or power up multiple devices at the same time.

本文研究了天线阵列在自由空间和带反射墙的全封闭箱体中的无线电力传输 (WPT) 系统效率。在这项研究中，我们研究了均匀发射天线阵列和随机阵列的 WPT 方法。具体来说，我们考虑了 10 个发射天线 (Tx) 放置在一个立方房间的两个相对的墙壁上，一个接收天线 (Rx) 位于中间。我们计算不同阵列配置的接收 (Rx) 功率。仿真结果表明，与自由空间中类似配置可实现的最大效率相比，随机性和反射墙的存在显着提高了系统的功率传输效率。此外，模拟的潮流密度显示了空间中的多个热点，随机阵列优于线性阵列，使系统非常动态。这可以为移动接收器提供电力，并满足收集无线能量以同时为多个设备充电或供电的需求。