Wideband Corrugated Feedhorns, for Radar, Communications, Radiometry and Quasi-Optics
Wideband Corrugated Feedhorns, for Radar, Communications, Radiometry and Quasi-Optics
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DOI：
10.1109/ojap.2022.3192115
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发表时间：
2022
影响因子：
4
通讯作者：
Daniel J. Sung;Nina Thomsen;Stuart Macpherson;R. Hunter;S. Rahman;D. Robertson;R. Wylde;Graham M. Smith
中科院分区：
文献类型：
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作者：
Daniel J. Sung;Nina Thomsen;Stuart Macpherson;R. Hunter;S. Rahman;D. Robertson;R. Wylde;Graham M. Smith
通过对标量波纹馈线喇叭中的HE11和HE12模式进行最佳激励和相位调整，可以合成各种理想的天线波束方向图。然而，这种双模喇叭的带宽常常受到模态色散的限制。在本文中，我们介绍了一类低色散，双模式馈线喇叭，在某些情况下，可以在40-50%的工作带宽上工作。我们提供的示例设计包括具有高耦合效率的喇叭：1)用于波纹管传输线单模激励的纯HE11模式；2) LG00和LG02组合用于辐射测量，窄光束；3)准光学仪器的纯拉盖尔高斯LG00模式；4)恒增益天线，实现有频均匀照明；5)用于雷达或通信应用的Airy图案或“大礼帽”图案，设计用于较大反射或透镜天线时最大限度地提高孔径效率。更一般地说，我们展示了生成和相位多个${\text{HE}}_{1n}$模式的方法，以合成任何所需频率或增益的对称输出光束。
A wide variety of desirable antenna beam patterns can be synthesized by optimal excitation and phasing of the HE11 and HE12 modes in scalar corrugated feedhorns. However, the bandwidth of such two-mode horns is often limited by modal dispersion. In this paper we introduce a class of low dispersion, two-mode feedhorns that can operate, in some cases, over operating bandwidths of 40-50%. We provide example designs that include horns with high coupling efficiency to: 1) a pure HE11 mode for single-mode excitation of corrugated pipe transmission lines; 2) a LG00 and LG02 combination for radiometry, with narrow beams; 3) a pure Laguerre Gaussian LG00 mode for quasi-optical instrumentation with constant phase centers; 4) a constant gain antenna for uniform illumination with frequency; 5) Airy patterns or “top hat” patterns for radar or communications applications, designed to maximize aperture efficiencies when used with larger reflect or lens antennas. More generally, we show methods to generate and phase multiple ${\text{HE}}_{1n}$ modes, to synthesize symmetric output beams at any desired frequency or gain.