Unbalanced-Fed TCDA Performance Improvement Using a Scan Impedance Model

IF 3.5 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Open Journal of Antennas and Propagation Pub Date : 2024-06-12 DOI:10.1109/OJAP.2024.3413012
Eric D. Robinson;Carey M. Rappaport
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Abstract

Unbalanced-fed Tightly-Coupled Dipole Arrays (TCDAs) allow for the realization of ultrawideband, wide-scanning phased arrays without the need for baluns, which may increase size, weight, and cost. However, unbalanced-fed TCDAs often have additional radiating modes and common-mode resonances which may degrade performance. In this paper, a scan impedance model is presented which describes performance in terms of a combination of even and odd monopole and dipole radiating modes. An intermodal coupling term is included to account for performance when scanning in the E-plane. Each mode is calculated individually in a full-wave solver and the model is then validated by comparing the proposed combination to a full simulation of the unbalanced-fed TCDA. A coaxial extension technique is then introduced to increase the impedance of the monopole-like radiating even mode, allowing the unbalanced-fed array to match the performance of the balanced-fed version without shorting posts or significant redesign of the elements or lattice.
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利用扫描阻抗模型提高非平衡馈电 TCDA 性能
非平衡馈电紧耦合偶极子阵列(TCDA)可实现超宽带、宽扫描相控阵,而无需使用平衡器,平衡器可能会增加尺寸、重量和成本。然而,非平衡馈电 TCDA 通常具有额外的辐射模式和共模谐振,可能会降低性能。本文介绍了一种扫描阻抗模型,该模型通过偶数和奇数单极子和偶极子辐射模式的组合来描述性能。其中还包括一个模间耦合项,以说明在 E 平面扫描时的性能。在全波求解器中对每种模式进行单独计算,然后通过比较建议的组合与非平衡馈电 TCDA 的完整模拟,对模型进行验证。然后引入同轴延伸技术,以增加单极辐射偶数模式的阻抗,从而使非平衡馈电阵列的性能与平衡馈电版本相匹配,而无需短接柱或对元件或晶格进行重大的重新设计。
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
CiteScore
6.50
自引率
12.50%
发文量
90
审稿时长
8 weeks
期刊最新文献
Front Cover Table of Contents IEEE Open Journal of Antennas and Propagation Instructions for authors Guest Editorial: Antenna-Enabled Sensors and Systems, the New Frontier in Sustainable Wireless Systems IEEE ANTENNAS AND PROPAGATION SOCIETY
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