Optimization-Based Design of Multi-Band Branch-Line Coupler With Arbitrary and Band-Distinct Power Division Ratios and Phase Differences

IF 6.9 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Abdullah J. Alazemi;Mohamed A. Koura
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引用次数: 0

Abstract

This paper presents a novel optimization-based procedure for designing a multi-band branch-line coupler with arbitrary output power division ratios and phase differences that are distinct at each of arbitrarily-allocated design frequencies. The procedure aims to find the optimal parameters of the design that result in the best possible performance while maintaining the deviation from the desired specifications within a predefined tolerance level. This procedure uses the analytical S-parameters of the proposed coupler which are derived using even-odd mode analysis. A tri-band (1.5/2.4/4.2 GHz) and a quad-band (1.5/2.4/3.5/4.2 GHz) microstrip prototypes are developed using the proposed procedure to have band-distinct power division ratios and phase differences. For validation, both prototypes are simulated, fabricated, and measured. At all operating frequencies, the measured deviations from the desired power division ratios and phase differences are within 1 dB and 10$^\circ$, respectively. Also, the measured matching and isolation are $< $ −11 dB at all design frequencies. The achieved measurement results and the agreement between measured results and theoretical expectations demonstrate the applicability of the proposed design procedure in practice. The proposed coupler is a candidate for use in analogue multi-band multi-beam antenna arrays, and the proposed design procedure can be applied in designing other multi-band microwave devices.
基于优化设计的任意带不同功率分割比和相位差的多频带支路耦合器
本文提出了一种新的基于优化的多波段分支线耦合器设计方法,该方法具有任意输出功率分配比和在任意分配的设计频率下不同的相位差。该程序旨在找到设计的最佳参数,从而获得最佳性能,同时将与期望规格的偏差保持在预定义的公差范围内。该程序使用了所提出的耦合器的解析s参数,该参数是通过奇偶模态分析得到的。利用所提出的方法开发了三波段(1.5/2.4/4.2 GHz)和四波段(1.5/2.4/3.5/4.2 GHz)微带原型,以具有不同频带的功率分配比和相位差。为了验证,两个原型都进行了模拟、制造和测量。在所有工作频率下,测量到的与期望功率分割比和相位差的偏差分别在1 dB和10$^\circ$之内。此外,测量的匹配和隔离是$<;$ - 11 dB在所有设计频率。实测结果与理论预期一致,证明了所提出的设计方法在实践中的适用性。所提出的耦合器可用于模拟多波段多波束天线阵列,所提出的设计方法可应用于其他多波段微波器件的设计。
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
10.70
自引率
0.00%
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0
审稿时长
8 weeks
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