5.8-GHz circularly polarized dual-rhombic-loop traveling-wave rectifying antenna for low power-density wireless power transmission applications
5.8-GHz circularly polarized dual-rhombic-loop traveling-wave rectifying antenna for low power-density wireless power transmission applications
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DOI：
10.1109/tmtt.2003.810137
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发表时间：
2003-04
影响因子：
4.3
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
本文报道了一种右旋圆极化（RHCP）高效率行波整流天线（整流天线）设计在共面带状线（CPS）电路，该电路蚀刻在Rogers Duroid 5870衬底上，/spl epsiv//sub r/=2.2和20密耳厚度。RHCP高增益双菱形环路天线（DRLA）的4 /spl times/ 1行波阵列和反射平面用于在较低功率密度的情况下提供高效的RF至DC转换，而无论整流天线的宽边方向如何。DRLA阵列的圆极化天线增益为14.6 dB，2：1电压驻波比带宽为17%，轴比分数带宽优于3 dB，为7%，中心约为5.8 GHz。该整流天线在5.8 GHz时实现了82%的RF到DC转换效率，并使用低剖面CPS带阻滤波器将再辐射的二次谐波抑制超过14 dB。当发射功率低和/或传输距离长时，在低功率密度下操作的整流天线应该具有许多应用。
This paper reports a right-hand circularly polarized (RHCP) high-efficiency traveling-wave rectifying antenna (rectenna) designed in a coplanar stripline (CPS) circuit that is etched on a Rogers Duroid 5870 substrate with /spl epsiv//sub r/=2.2 and 20-mil thickness. A 4 /spl times/ 1 traveling-wave array of RHCP high-gain dual-rhombic-loop antennas (DRLAs) and a reflecting plane are used to provide highly efficient RF-to-DC conversion in the presence of lower power densities regardless of the rectenna's broadside orientation. The DRLA array has a circularly polarized antenna gain of 14.6 dB with a 2:1 voltage standing-wave ratio bandwidth of 17% and a better than 3 dB axial ratio fractional bandwidth of 7% centered about 5.8 GHz. The rectenna achieves 82% RF-to-DC conversion efficiency at 5.8 GHz and uses a low-profile CPS band-reject filter to suppress the re-radiated second harmonic by over 14 dB. The rectenna operating at low power density should have many applications when the transmitting power is low and/or the transmission distance is long.