1. T. Fukasawa, N. Yoneda and H. Miyashita, "Investigation on Current Reduction Effects of Baluns for Measurement of a Small Antenna," in IEEE Transactions on Antennas and Propagation, vol. 67, no. 7, pp. 4323-4329, July 2019.
减小巴伦电流对小天线测量的影响
当连接较小的被测天线时,包括同轴线在内的金属线缆有时会带来严重影响。当天线地面积较小结构不对称时,这一问题更突出。巴伦最早被用于不平衡到平衡的转换,目前人们设计了许多类型的巴伦。然而当用巴伦做天线测量时候,我们无法确定是否可以减小测试线缆的影响。本文根据巴伦对不平衡电流的转换效果将它们分为两类即高阻抗和低阻抗巴伦。Bazooka、集中巴伦为高阻抗巴伦,三枝节和渐变型巴伦为低阻抗巴伦。图1为仅添加金属导线对天线方向图影响。图2图3分别为低阻高阻巴伦对天线方向图影响,通过高阻抗巴伦的变换可以方向图保持与天线本身的方向图一致。
2. Y. Niew, K. Lee, E. Lim, F. Bong and B. Chung, "Patch-Loaded Semicircular Dipolar Antenna for Metal-Mountable UHF RFID Tag Design," in IEEE Transactions on Antennas and Propagation , vol. 67, no. 7, pp. 4330-4338, July 2019.
贴片加载的半圆形偶极子抗金属UHF RFID标签天线设计
下图为天线结构图,文中还给出了天线的等效电路。通过旋转顶层加载的贴片可以改变天线阻抗和工作频率,在4W的EIRP下可以达到12.25m的读写距离。天线工作频率不受金属地面大小的影响。
3. Q. Guo and H. Wong, "Wideband and High-Gain Fabry–Pérot Cavity Antenna With Switched Beams for Millimeter-Wave Applications," in IEEE Transactions on Antennas and Propagation, vol. 67, no. 7, pp. 4339-4347, July 2019.
毫米波宽带高增益法布里-珀罗腔(Fabry–Pérot)多波束天线
天线阻抗带宽24%,60GHz处测量的增益17.6dBi,方向性系数18.8dBi。这里方向性系数通过NSI近场测量系统获得,测量角度范围为±60°。Rogers 5880在60GHz处损耗角正切值为0.004。总效率和口径效率分别为76%和31%。通过在不同位置馈电,天线可以在-18°,0°,18°三个角度切换。
4. E. B. Lima, J. R. Costa and C. A. Fernandes, "Multiple-Beam Focal-Plane Dual-Band Fabry–Pérot Cavity Antenna With Reduced Beam Degradation," in IEEE Transactions on Antennas and Propagation, vol. 67, no. 7, pp. 4348-4356, July 2019.
具有较好的波束退化性能的多波束聚焦平面双频段法布里-珀罗腔天线
本期第4篇文章依然是一篇FP腔体的。在波束逐渐增多的Ka频段卫星通信中,多馈源公用反射面的聚焦平面反射面天线是很好的解决方案。
5. J. Eichenberger, E. Yetisir and N. Ghalichechian, "High-Gain Antipodal Vivaldi Antenna With Pseudoelement and Notched Tapered Slot Operating at (2.5 to 57) GHz," in IEEE Transactions on Antennas and Propagation, vol. 67, no. 7, pp. 4357-4366, July 2019.
高增益Vivaldi天线(2.5-50.7 GHz)
通过添加椭圆结构和不规则变化的凹槽实现方向性提升和副瓣电平的抑制。天线可以覆盖2.5-57GHz范围22.8倍频,实际增益4-16 dBi。天线加工上下两层用6002,中间通过半固化片3001粘接。天线采用1.85mm同轴接头测量。
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Trans. on AP-19-07-2