Investigation of a Circularly Polarized Log-Periodic Dipole Antenna

IF 3.5 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Open Journal of Antennas and Propagation Pub Date : 2024-03-20 DOI:10.1109/OJAP.2024.3376514

Kunpeng Wei;Xiaopeng Zhang;Libin Sun;Changjiang Deng

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引用次数: 0

Abstract

In this letter, a circularly-polarized (CP) log-periodic dipole antenna (LPDA) is investigated. Eight crossed dipole cells with a logarithmically increased

$\lambda $

/8 separation are employed to form the proposed CP LPDA. The dipoles with increased length and spacing are fed in series by an air-filled parallel line. The working mechanism of the generation of back-fire CP radiation is illustrated by an array analyzation. Besides, the LPDA design factors for both polarizations are analyzed in detail to realize an optimized CP performance. To validate the performance of the proposed eight-element CP LPDA, a prototype was fabricated and measured. The measured axial ratio (AR) bandwidth (0.8-2.5 GHz) is coincident with the impedance bandwidth (0.8-2.43 GHz), and it can be further increased with more elements. The overlapping bandwidth with VSWR < 2, AR < 3 dB, gain variation < 3 dB, and back-fire gain > 5 dBic is 0.94-2.43 GHz (2.6:1), and the radiation pattern is stable across the entire band.

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圆极化对数周期偶极子天线研究

本文研究了一种圆极化（CP）对数周期偶极子天线（LPDA）。八个交叉偶极子单元以对数增加的 $\lambda $ /8 间距构成了拟议的 CP LPDA。长度和间距增加的偶极子由一条充满空气的平行线串联馈电。通过阵列分析，说明了产生背射 CP 辐射的工作机制。此外，还详细分析了两种极化的 LPDA 设计因素，以实现优化的 CP 性能。为了验证所提出的八元件 CP LPDA 的性能，制作并测量了一个原型。测得的轴向比（AR）带宽（0.8-2.5 GHz）与阻抗带宽（0.8-2.43 GHz）相吻合，而且随着元件的增加，带宽还能进一步提高。在驻波比 < 2、AR < 3 dB、增益变化 < 3 dB 和背射增益 > 5 dBic 的情况下，重叠带宽为 0.94-2.43 GHz (2.6:1)，辐射模式在整个频带内都很稳定。

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来源期刊

IEEE Open Journal of Antennas and Propagation Multiple-

CiteScore

6.50

自引率

12.50%

发文量

审稿时长

8 weeks