Four-Leaf-Clover Slot Planar Antenna Based on All-Metal Back Cavity Structure

IF 4.6 2区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Antennas and Wireless Propagation Letters Pub Date : 2026-10-01 Epub Date: 2026-08-12 DOI:10.1109/LAWP.2026.3723276

Yongkang Shi;Hao Liu;Yongjun Xie;Xiaonan Wu;Shijing Wei;Mingxia Meng;Yuedong Liu

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Abstract

Low-profile planar antennas are widely deployed on various radar platforms. This letter presents a Ka-band fully metallic planar slot antenna integrated with a sum–difference power divider network for synthetic aperture radar (SAR). Each four-unit radiating element consists of four four-leaf-clover radiating cavities, a cross-slot coupling cavity, and a longitudinal feed waveguide, which features high gain, high efficiency, and simple configuration. The element has an electrical size of 2.36λ₀ × 2.36λ₀, delivering a gain over 18.3 dBi and aperture utilization efficiency above 97%. Utilizing large-aperture high-gain elements reduces the total array element number, simplifies the feed topology, and lowers design complexity. The proposed design addresses the narrowband limitation of waveguide slot arrays and high-loss drawback of microstrip planar arrays. The fabricated 4 × 8 array realizes a measured realized gain higher than 32.5 dBi, aperture utilization efficiency over 88%, fractional bandwidth wider than 8.6%, and first sidelobe level below −18 dB. This antenna provides a promising design scheme for miniaturized SAR planar antennas.

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基于全金属后腔结构的四叶三叶草槽平面天线

低轮廓平面天线被广泛部署在各种雷达平台上。本文介绍了一种用于合成孔径雷达（SAR）的ka波段全金属平面缝隙天线和差分功率分配器网络。每个四单元辐射元件由四个四叶三叶草辐射腔、一个交叉槽耦合腔和一个纵向馈电波导组成，具有高增益、高效率和结构简单的特点。该元件的电尺寸为2.36λ0 × 2.36λ0，增益超过18.3 dBi，孔径利用率超过97%。采用大口径高增益元件可减少阵列总元件数量，简化馈电拓扑结构，降低设计复杂性。该设计解决了波导缝隙阵列的窄带限制和微带平面阵列的高损耗缺点。所制备的4 × 8阵列的实测增益大于32.5 dBi，孔径利用率大于88%，分数带宽宽度大于8.6%，第一副瓣电平低于- 18 dB。该天线为小型化SAR平面天线提供了一种很有前途的设计方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Antennas and Wireless Propagation Letters 工程技术-电信学

CiteScore

8.00

自引率

9.50%

发文量

529

审稿时长

1.0 months

期刊介绍： IEEE Antennas and Wireless Propagation Letters (AWP Letters) is devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation. These are areas of competence for the IEEE Antennas and Propagation Society (AP-S). AWPL aims to be one of the "fastest" journals among IEEE publications. This means that for papers that are eventually accepted, it is intended that an author may expect his or her paper to appear in IEEE Xplore, on average, around two months after submission.