NDLI: Radial stub based negative group delay circuit theory

Content Provider	IET Digital Library
Author	Wan, Fayu Xu, Yexiang Ravelo, Blaise
Abstract	This study addresses a negative group delay (NGD) circuit theory regarding a distributed passive topology consisted of an open-ended radial stub. The equivalent circuit composed of the lumped R, L and C elements is proposed. Then, the S-parameter model of the passive topology is established. The NGD analysis is described from the S-parameter model. The synthesis method enabling to determine the stub parameters as a function of the targeted NGD level, frequency centre and reflection coefficient is formulated. The radial stub topology limit is explained with an analytical condition from the synthesis relation. The developed NGD theory feasibility is validated with two cases of proof-of-concept (POC). First, ideal POC circuit with NGD value varied from −2 to −1 ns around the centre frequency 1.3 GHz is confirmed with ideal optimised circuit presenting figure-of-merit of approximately −0.27. Then, the theoretical prediction is verified numerically and experimentally by designing and fabricating an actual microstrip radial stub circuit. The calculated model, simulation and measurements are in very good correlation. The prototype test results confirm that the NGD circuit exhibits an NGD of approximately −1.2 ns level at approximately 0.85 GHz centre frequency.
Starting Page	515
Ending Page	521
Page Count	7
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 6, May (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2019.0642
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-02-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Analytical Condition Delay Circuit Distributed Passive Topology Equivalent Circuit Figure of Merit Frequency 1.3 GHz Frequency Centre Ideal POC Circuit Lumped C Element Lumped L Element Lumped R Element Microstrip Circuit Microstrip Radial Stub Circuit Microwave Circuit And Device Negative Group Delay Circuit Theory NGD Analysis NGD Circuit NGD Theory Feasibility Numerical Analysis Numerical Method Open-ended Radial Stub Proof-of-concept Radial Stub Topology Limit Reflection Coefficient S Parameter S-parameter Model Stub Parameter Synthesis Method Synthesis Relation Targeted NGD Level UHF Circuit Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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