Comite Davide, Podilchak Symon K, Baccarelli Paolo, Burghignoli Paolo, Galli Alessandro, Freundorfer Al P, Antar Yahia M M
Sapienza University, Department of Information Engineering, Electronics and Telecommunications, Rome, Italy.
Heriot-Watt University, Institute of Sensors, Signals, and Systems, Edinburgh, United Kingdom.
Sci Rep. 2018 Dec 10;8(1):17741. doi: 10.1038/s41598-018-35480-7.
A low-cost compact planar leaky-wave antenna (LWA) is proposed offering directive broadside radiation over a significantly wide bandwidth. The design is based on an annular metallic strip grating (MSG) configuration, placed on top of a dual-layer grounded dielectric substrate. This defines a new two-layer parallel-plate open waveguide, whose operational principles are accurately investigated. To assist in our antenna design, a method-of-moments dispersion analysis has been developed to characterize the relevant TM and TE modes of the perturbed guiding structure. By proper selection of the MSG for a fabricated prototype and its supporting dielectric layers as well as the practical TM antenna feed embedded in the bottom ground plane, far-field pencil-beam patterns are observed at broadside and over a wide frequency range, i.e., from 21.9 GHz to 23.9 GHz, defining a radiating percentage bandwidth of more than 8.5%. This can be explained by a dominantly excited TM mode, with low dispersion, employed to generate a two-sided far-field beam pattern which combines to produce a single beam at broadside over frequency. Some applications of this planar antenna include radar and satellite communications at microwave and millimeter-wave frequencies as well as future 5G communication devices and wireless power transmission systems.
提出了一种低成本紧凑型平面漏波天线（LWA），该天线在显著宽的带宽上提供定向宽边辐射。该设计基于放置在双层接地介质基板顶部的环形金属条光栅（MSG）结构。这定义了一种新的双层平行板开放波导，并对其工作原理进行了精确研究。为辅助天线设计，已开发出一种矩量法色散分析方法，用于表征受扰导波结构的相关TM和TE模式。通过为制造的原型适当选择MSG及其支撑介质层，以及嵌入底部接地平面的实际TM天线馈源，在宽边和宽频率范围内（即从21.9 GHz到23.9 GHz）观察到远场笔形波束方向图，辐射百分比带宽超过8.5%。这可以通过一个主导激发的低色散TM模式来解释，该模式用于生成双侧远场波束方向图，这些方向图在频率上组合在宽边产生单个波束。这种平面天线的一些应用包括微波和毫米波频率的雷达和卫星通信，以及未来的5G通信设备和无线电力传输系统。
