Highly efficient C-band circularly polarized rectifying antenna array for wireless microwave power transmission
Highly efficient C-band circularly polarized rectifying antenna array for wireless microwave power transmission
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DOI：
10.1109/tap.2003.812252
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发表时间：
2003-07
影响因子：
5.7
通讯作者：
B. Strassner;K. Chang
中科院分区：
文献类型：
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作者：
B. Strassner;K. Chang
本文报道了一种在共面带状线（CPS）电路中设计的新型圆极化（CP）高增益、高效率整流天线阵列。该阵列可以保持恒定的直流输出电压，而不管其宽方向。该阵列蚀刻在Rogers Duroid 5870衬底上，/spl epsiv//sub r/=2.33，厚度为10 mil。为了减少覆盖固定区域所需的整流天线元件的总数，使用了高增益双菱形环天线和反射平面。每个天线的CP天线增益为11 dB，轴比优于1 dB的分数带宽为4.7%。单元件天线在5.71 GHz时实现81%的rf -dc转换效率，并使用CPS带阻滤波器（BRF）抑制辐射谐波，抑制幅度超过19 dB。在5.61 GHz时，使用负载为150 /spl ω /的阵列，3 /spl times/ 3的整流天线阵列产生0.86 W的直流输出功率，rf -dc转换效率为78%，轴向比为0.25 dB，入射CP功率密度为7.6 mW/cm/sup /。
This paper reports a new circularly polarized (CP) high-gain, high-efficiency rectifying antenna (rectenna) array designed in a coplanar stripline (CPS) circuit. The array can maintain a constant dc output voltage regardless of its broadside orientation. The array is etched on Rogers Duroid 5870 substrate with /spl epsiv//sub r/=2.33 and 10 mil thickness. High-gain dual rhombic loop antennas and a reflecting plane are used in order to reduce the total number of rectenna elements necessary to cover a fixed area. Each antenna has a CP antenna gain of 11 dB and a better than 1 dB axial ratio fractional bandwidth of 4.7%. The single element rectenna achieves 81% RF-to-dc coversion efficiency at 5.71 GHz and uses a CPS band-reject filter (BRF) to suppress the reradiated harmonics by more than 19 dB. At 5.61 GHz, using an array loading of 150 /spl Omega/, a 3 /spl times/ 3 rectenna array produces 0.86 W of dc output power with an RF-to-dc conversion efficiency of 78% and an axial ratio of 0.25 dB for an incident CP power density of 7.6 mW/cm/sup 2/.