A Compact Hybrid-Fed Microstrip Antenna for Harmonics-Based Radar and Sensor Systems
A Compact Hybrid-Fed Microstrip Antenna for Harmonics-Based Radar and Sensor Systems
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DOI：
10.1109/lawp.2018.2877674
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发表时间：
2018-10
影响因子：
4.2
通讯作者：
Liang Zhu;Nasser Alkhaldi;Haysam M. Kadry;Shaolin Liao;Pai-Yen Chen
中科院分区：
文献类型：
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作者：
Liang Zhu;Nasser Alkhaldi;Haysam M. Kadry;Shaolin Liao;Pai-Yen Chen
在这封信中，我们提出并实验验证了一个紧凑的混合馈电微带天线的谐波为基础的雷达和传感器系统，接收的基波和调制的二次谐波。所提出的微带天线是基于一个简单的单层和双馈结构，包括一个内圆形贴片工作在TM 110模式（二次谐波; 6 GHz）和一个外分裂环贴片工作在高阶TM 210或TM 310模式（基频; 3 GHz）。通过改变馈电位置和开口环贴片的几何形状，可以在基频处激发特定的高阶模式。此外，推导出了计算天线谐振频率的解析表达式。我们的测量结果表明，最大实现增益为1.17 dB在3 GHz和3.33 dB在6 GHz，具有良好的阻抗匹配（|S11| <-15 dB）和高隔离度（<-20 dB）。
In this letter, we propose and experimentally validate a compact hybrid-fed microstrip antenna for the harmonics-based radar and sensor systems, which receive the fundamental tone and retransmit the modulated second harmonic. The proposed microstrip antenna is based on a simple single-layered and dual-feed structure, consisting of an inner circular patch operating in the TM110 mode (second harmonic; 6 GHz) and an outer split-ring patch operating in the higher order TM210 or TM310 mode (fundamental frequency; 3 GHz). By varying the feed position and the geometry of the split-ring patch, a specific higher order mode can be excited at the fundamental frequency. Moreover, analytical expressions were derived for calculating the antenna's resonant frequencies. Our measurement results show that the maximum realized gain is 1.17 dB at 3 GHz and is 3.33 dB at 6 GHz, with good impedance matching (|S11| < −15 dB) and high isolation (< −20 dB).