【摘要】 文章针对单一极化能量接收装置的微波吸收能力有限,无法适应多极化的需求提出了一种新型的微波能量接收方法,能够吸收任意方向极化入射电磁波,并转化为直流能量,方案由双线极化谐振单元组成周期阵列平面,并在背后引入射频功率合成网络,分别对接收下来的垂直与水平极化分量进行功率合成,创新性地引入了3dB定向耦合器,将等相位不等幅度的垂直与水平极化微波分量重新分配为不等相位等幅度的能量,分别输入到两独立的整流电路中,转换为直流。整流电路根据输入功率而优化的,该方案使得任意线极化入射条件下,两个整流电路的射频功率相等,可工作在恒定转换效率上;射频功率合成电路的使用增大了进入整流管的微波功率,提升了能量转换效率。实验结果表明,工作频率为2.325 GHz时在0.15 mW/cm~2的入射功率密度下,整流天线实物针对各角度线极化微波的RF-to-DC能量转换效率在57.23%到58.13%的范围内小幅波动变化,验证了设计方案的有效性。更多还原

【Abstract】 Microwave wireless power transfer(WPT) offers a new way to remotely transfer electric energy. This paper presents a WPT system to receive arbitrarily polarized microwave radiation with relatively low power density. The proposed rectifying surface consists of dual linearly polarized units and a branch coupler. Two orthogonal components of received RF signals with equal phases but unequal amplitudes can be mixed into two outputs with equal amplitudes but unequal phases, so that optimal efficiency regardless of the polarization angle of incident filed can be obtained. The fabricated sample operates on the frequency of 2.325 GHz. It shows RF-to-DC efficiency ranging from 57.23% to 58.13% at all linear polarization angles, under 0.15-mW/cm~2 incidence. The proposed approach can also be used to receive incidences with arbitrary polarizations, which can be potentially used in diverse applications such as space solar power satellite(SSPS) systems.更多还原