A Self-Nulling Single-Layer Dual-Mode Microstrip Patch Antenna for Grating Lobe Reduction
A Self-Nulling Single-Layer Dual-Mode Microstrip Patch Antenna for Grating Lobe Reduction
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DOI：
10.1109/lawp.2020.3007903
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发表时间：
2020-09-01
影响因子：
4.2
通讯作者：
Pour, Maria
中科院分区：
文献类型：
--
作者：
Iqbal, Zabed;Mitha, Tanzeela;Pour, Maria
提出了一种单层双模微带贴片天线。该天线由圆形微带贴片天线组成，周围环绕着一个短路同心圆贴片，分别激励TM11和TM21模式。通过同时激励这两种模式，实现了具有自扫描和归零能力的自适应辐射方向图。受TM21模式表面电流分布的启发，在环形贴片中设置了四个对称的弧形狭缝和两个水平狭缝，以获得模式的纯洁性。为了小型化的目的，圆形贴片由三个垂直狭缝加载。制作了该天线的样机并进行了测试。测量结果与仿真结果吻合较好。为了展示所提出的自归零双模天线的有效性，将其用作单元间距大于一个波长的线性扫描阵列中的天线单元，以减少其不需要的栅瓣。
A single-layer, dual-mode microstrip patch antenna with self-nulling patterns is proposed. The antenna consists of a circular microstrip patch antenna, surrounded by a shorted concentric ring patch, exciting the TM11 and TM21 modes, respectively. Adaptive radiation patterns with self-scanning and nulling capabilities are realized by concomitantly exciting these two modes. To attain the mode purity, four symmetrical arc slits, inspired by the surface current distribution of the TM21 mode, as well as two horizontal slits are placed in the ring patch. For the miniaturization purpose, the circular patch is loaded by three vertical slits. A prototype of the proposed antenna is fabricated and tested. The measured results are in good agreement with the simulation results. To showcase the effectiveness of the proposed self-nulling dual-mode antenna, it is employed as an antenna element in a linear scanning array with element spacing greater than one-wavelength to reduce its unwanted grating lobes.