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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Compact printed ultra-wideband diversity monopole antenna with slant inverted tree-shaped stub
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Compact printed ultra-wideband diversity monopole antenna with slant inverted tree-shaped stub

机译：紧凑的印刷超宽带分集单极天线，带有倾斜的倒置树状短截线

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摘要

A compact two-port diversity antenna is proposed and experimentally investigated. One of the ports is connected to a microstrip feed, whereas the other port to a coplanar waveguide feed. The radiating elements are semi-circular disc-shaped monopoles rotated around their centres. By shaping the common ground plane, ultra-wide impedance bandwidth is achieved. The measured bandwidths are 2–12 GHz at port 1 and 2.3–10.2 GHz at port 2. To obtain good isolation between the ports, a slant inverted tree-shaped structure is attached at the corner of the ground plane. The measured isolation is about 20 dB throughout the band. The antenna has omni-directional radiation patterns with a moderate peak gain of 2–7 dBi. To evaluate the diversity performance, the envelope correlation coefficient, diversity gain and capacity loss are calculated. A modified design with impedance bandwidth at port 2 extending beyond 11 GHz is also presented. The proposed diversity antenna is an attractive candidate to provide polarisation diversity and enhance channel capacity in a rich scattering environment.
机译：提出了一种紧凑的两端口分集天线并进行了实验研究。其中一个端口连接到微带馈源，而另一个端口连接到共面波导馈源。辐射元件是绕其中心旋转的半圆盘形单极子。通过对公共接地层进行整形，可以实现超宽的阻抗带宽。在端口1处测得的带宽为2–12 GHz，在端口2处测得的带宽为2.3–10.2 GHz。为了在端口之间获得良好的隔离，在地面平面的一角安装了倾斜的倒置树形结构。在整个频段内测得的隔离度约为20 dB。天线具有全向辐射方向图，其峰值增益为2-7 dBi。为了评估分集性能，计算了包络相关系数，分集增益和容量损耗。还提出了端口2的阻抗带宽超过11 GHz的改进设计。所提出的分集天线是在丰富的散射环境中提供极化分集和增强信道容量的诱人候选。

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