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Frequency-Dependent Feeding Methods for Broadband Vivaldi Arrays With Minimum Half-Power Beamwidth (HPBW) Variation
IEEE Open Journal of Antennas and Propagation Pub Date : 2021-04-26 , DOI: 10.1109/ojap.2021.3075418
Dakotah J. Simpson , Dimitra Psychogiou

This paper reports on the design of frequency-dependent feed networks for linear antenna arrays with minimum half-power beamwidth (HPBW) variation in more than one octave of the frequency spectrum. The proposed approach is based on: i) frequency-dependent power dividers that gradually shift the RF power from the outer elements of the array to the inner ones with the increase of frequency and ii) uniformly or non-uniformly-spaced directive antenna elements. The operating principles and design trade-offs of the concept are presented through ideal simulations of four- and six-element antenna arrays shaped by isotropic or directive radiators. It is shown that by employing directive antenna elements and non-uniform spacing, minimum HPBW variation can be obtained in a broad bandwidth (BW, e.g., 3:1). For physical verification purposes, two frequency-dependent feed networks and Vivaldi antenna elements were designed, manufactured, and measured. The first network feeds a uniformly-spaced four-element array of Vivaldi antennas and demonstrates a 58% HPBW variation in a 3:1 of BW. The second network feeds a non-uniformly-spaced six-element Vivaldi array and results in a 67% HPBW variation in a 2.5:1 of BW.

中文翻译:

具有最小半功率波束宽度(HPBW)变化的宽带Vivaldi阵列的频率相关馈送方法

本文报道了线性天线阵列的频率相关馈电网络的设计,该网络在频谱的一个八度以上具有最小的半功率波束宽度(HPBW)变化。所提出的方法基于:i)随频率变化的功率分配器,随着频率的增加,RF功率逐渐从阵列的外部元件转移到内部,并且ii)均匀或非均匀间隔的定向天线元件。通过对各向同性或定向辐射器成形的四元和六元天线阵列的理想仿真,可以给出该概念的工作原理和设计折衷。结果表明,通过采用定向天线元件和不均匀的间距,可以在较宽的带宽(BW,例如3:1)中获得最小的HPBW变化。为了进行物理验证,设计,制造和测量了两个频率相关的馈电网络和Vivaldi天线元件。第一个网络为Vivaldi天线提供了均匀间隔的四元素阵列,并在3:1的BW中显示了58%的HPBW变化。第二个网络馈送了一个非均匀间隔的六元素Vivaldi阵列,并以2.5:1的BW导致了67%的HPBW变化。
更新日期:2021-05-07
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