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由背腔螺旋天线激励的宽带圆极化介质棒天线

Broadband circularly polarized dielectric rod antenna excited by a cavity backed spiral.

作者信息

Fakhte Saeed, Ashouri Mohammad Hossein

机构信息

School of Electrical and Computer Engineering, Qom University of Technology, Qom, Iran.

出版信息

Sci Rep. 2025 Jul 1;15(1):20733. doi: 10.1038/s41598-025-05598-6.

DOI:10.1038/s41598-025-05598-6
PMID:40593075
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12218070/
Abstract

This paper introduces a new broadband dielectric rod antenna with circular polarization that can be utilized in microwave imaging applications. The antenna utilizes a sine wave modulated Archimedean spiral to launch hybrid mode within the dielectric rod, resulting in a wide circular polarization bandwidth and high right-hand circularly polarized gain. The spiral's wideband nature and the rod's high-gain feature are used simultaneously. The antenna is excited using a linearly tapered microstrip balun that functions as a balanced transmission line. Throughout the operational bandwidth, the HE mode is the single guided mode inside the rod. The measured results demonstrate that the proposed antenna achieves an ultrawide impedance and 3-dB axial ratio bandwidths of 56.9% from 3.9 to 7 GHz, along with a gain between 8 to 12.4 dBic.

摘要

本文介绍了一种可用于微波成像应用的新型宽带圆极化介质棒天线。该天线利用正弦波调制的阿基米德螺旋在介质棒内激发混合模式，从而实现宽圆极化带宽和高右旋圆极化增益。同时利用了螺旋的宽带特性和介质棒的高增益特性。该天线采用线性渐变微带巴伦进行激励，其作为平衡传输线发挥作用。在整个工作带宽内，HE模式是介质棒内的单一导模。测量结果表明，所提出的天线在3.9至7GHz范围内实现了56.9%的超宽阻抗带宽和3dB轴比带宽，增益在8至12.4dBic之间。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/48d15db52e64/41598_2025_5598_Fig10_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/48bf0e53c938/41598_2025_5598_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/c554693961bf/41598_2025_5598_Fig5_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/4ff28d108a05/41598_2025_5598_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/48d15db52e64/41598_2025_5598_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/dfc17bbab3d4/41598_2025_5598_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/7a4846143e71/41598_2025_5598_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/4a24a6b0bef8/41598_2025_5598_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/48bf0e53c938/41598_2025_5598_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/c554693961bf/41598_2025_5598_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/948dc716b7e8/41598_2025_5598_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/4ab0eca8f4ae/41598_2025_5598_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/a3b3a65cf8dd/41598_2025_5598_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/4ff28d108a05/41598_2025_5598_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8a14/12218070/48d15db52e64/41598_2025_5598_Fig10_HTML.jpg

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