This article presents a comprehensive study of the design and performance of a multilayer dielectric rod waveguide (MDRW) with a rectangular cross section. The design is comprised of a high permittivity core encased by a low permittivity cladding. A mathematical model is proposed to predict the fundamental mode cutoff frequency in terms of the core dimensions and the core and cladding permittivity. The model is useful for design purposes and it offers an excellent match to full-wave electromagnetic (EM) simulation results. The MDRW performance is measured for the extended Ku-band (10-18 GHz) considering straight and bent waveguides with different radius of curvatures. The particular multilayer configuration shows a 16.7% and 24% extension of the 1 dB low-band cutoff frequency for a 10×10 mm2 and 20×20 mm2 cladding area, respectively, when compared to a single layer dielectric rod waveguide (DRW) design of the same core dimensions. MDRW bends also exhibit a significant reduction of the 1 dB low-band cutoff frequency from 20% to 40% when compared to single-layer designs, for the different radius of curvature bends.

中文翻译：

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多层介质棒波导的分析与实验研究


本文对具有矩形横截面的多层介质棒波导 (MDRW) 的设计和性能进行了全面研究。该设计由低​​介电常数包层包裹的高介电常数芯组成。提出了一种数学模型，用于根据纤芯尺寸以及纤芯和包层介电常数来预测基模截止频率。该模型对于设计目的非常有用，并且与全波电磁 (EM) 仿真结果完美匹配。 MDRW 性能是针对扩展 Ku 频段 (10-18 GHz) 测量的，考虑了具有不同曲率半径的直波导和弯曲波导。与单层电介质棒波导 (DRW) 设计相比，特定的多层配置在 10×10 mm2 和 20×20 mm2 包层面积下的 1 dB 低频带截止频率分别延长了 16.7% 和 24%具有相同的核心尺寸。对于不同曲率半径的弯曲，与单层设计相比，MDRW 弯曲还表现出 1 dB 低频截止频率从 20% 显着降低到 40%。