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。
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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 Guest Editorial Introduction to the Special Section on Women’s Research in Antennas and Propagation Section (WRAPS) IEEE ANTENNAS AND PROPAGATION SOCIETY Electromagnetic and Thermal Co-Analysis of an Implanted Dipole Antenna
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