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Design Engineering of Tri-Band Ulu-Shape NGD Circuit
Radio Science ( IF 1.6 ) Pub Date : 2021-06-25 , DOI: 10.1029/2021rs007269
Taochen Gu 1 , Fayu Wan 1 , Jamel Nebhen 2 , Sébastien Lallechère 3 , Blaise Ravelo 1
Affiliation  

This paper investigates a negative group delay (NGD) design of Ulu geometrical shape circuit. The NGD basic topology is constituted by a coupled line coupler with two-port terminated by open-ended stub. The S-matrix model of the topology is presented. The design equations allowing to determine the NGD circuit parameters in function of the NGD function specifications, NGD center frequency, NGD values and insertion loss are presented. As proof of concept, a microstrip circuit is designed and fabricated. As expected, the tested results confirm that the circuit behaves as bandpass NGD function. The modeled, simulated and measured results are in good correlation. The POC operates with tri-band NGD behavior with center frequencies around 0.645, 1.285, and 1.87 GHz with NGD values of about −3.5, −2, and −1 ns, respectively.

中文翻译:

三频乌鲁形NGD电路设计工程

本文研究了 Ulu 几何形状电路的负群延迟 (NGD) 设计。NGD 基本拓扑结构由一个耦合线耦合器构成,该耦合器具有两个端口,端接开端存根。给出了拓扑的 S 矩阵模型。给出了允许根据 NGD 功能规格、NGD 中心频率、NGD 值和插入损耗来确定 NGD 电路参数的设计方程。作为概念证明,设计并制造了微带电路。正如预期的那样,测试结果证实该电路具有带通 NGD 功能。建模、模拟和测量结果具有良好的相关性。POC 以三频 NGD 行为运行,中心频率约为 0.645、1.285 和 1.87 GHz,NGD 值分别约为 -3.5、-2 和 -1 ns。
更新日期:2021-07-13
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