A novel passive frequency beam-steering linear antenna array is proposed in this paper to be utilized at the transmit side of a long-range wireless power transfer (WPT) system. To assure high power handling for a long-range transfer, the proposed antenna is designed based on stripline technology. Moreover, unlike other reported designs, the antenna array in this paper uses parallel feed while frequency beam-steering. This permits to apply a special synthesis at the radiating elements to minimize the energy wasted at the side lobes. The antenna array uses common-fed dipoles as radiating elements to eliminate the surface current at the ground planes that is considered a critical issue in high power applications. The antenna covers the frequency band from 1.1 to 1.5 GHz with a reflection coefficient better than −10 dB (VSWR < 2). Consequently, steers its main lobe from 60° to 90° respectively. Being passive, the efficiency of the WPT system is improved as no active component is needed to steer the antenna beam. The antenna is capable of radiating simultaneous, sequential or selective (shuffled) multiple beams for multiple receivers with a half-power beamwidth of 6°, a peak-to-side lobe level better than 20 dB and an average realized gain of 13 dBi. The antenna array handles a peak power reaches 1.6 MW which makes it an excellent candidate for a long-range WPT system.

本文提出了一种新颖的无源波束控制线性天线阵列，用于远程无线电力传输（WPT）系统的发送端。为了确保长距离传输的高功率处理，建议的天线是基于带状线技术设计的。此外，与其他已报道的设计不同，本文中的天线阵列在波束控制时使用并行馈电。这允许在辐射元件上进行特殊的合成，以最小化旁瓣上浪费的能量。天线阵列使用共馈偶极子作为辐射元件，以消除接地平面上的表面电流，这在高功率应用中被认为是一个关键问题。天线覆盖1.1至1.5 GHz频带，反射系数优于-10 dB（VSWR <2）。所以，将其主瓣分别从60°转向90°。由于是无源的，WPT系统的效率得到了提高，因为不需要有源组件来操纵天线波束。该天线能够为多个接收机同时发射，顺序发射或选择性发射（混洗）的多束波束，半功率波束宽度为6°，波峰旁瓣电平优于20 dB，平均实现增益为13 dBi。该天线阵列可处理的峰值功率达到1.6 MW，这使其成为远程WPT系统的理想选择。峰旁瓣电平优于20 dB，平均实现增益为13 dBi。该天线阵列可处理的峰值功率达到1.6 MW，这使其成为远程WPT系统的理想选择。峰旁瓣电平优于20 dB，平均实现增益为13 dBi。该天线阵列可处理的峰值功率达到1.6 MW，这使其成为远程WPT系统的理想选择。