Negative Group Delay Theory on li Topology

This paper investigates an innovative negative group delay (NGD) theory of "li" geometrical shape topology. The li-topology is an outstandingly simple and fully distributed circuit comprised of a coupled line (CL). The li S-parameter model taking into account the CL coupling coefficient, d...

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Bibliographic Details
Published inIEEE access Vol. 8; p. 1
Main Authors Ravelo, Blaise, Wu, Lili, Wan, Fayu, Rahajandraibe, Wenceslas, Murad, Nour Mohammad
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.01.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Attenuation
Bandpass
Bandwidths
Circuits
Computer Science
Correlation analysis
Coupling coefficients
Delays
Distributed circuit
Electromagnetism
Electronics
Engineering Sciences
Group delay
Integrated circuit modeling
li-topology
Mathematical models
Microwave amplifiers
Microwave circuits
Microwave photonics
Microwave theory
Negative group delay (NGD)
Networking and Internet Architecture
Parameters
Reflectance
S-matrix modelling
Signal and Image Processing
Smatrix modelling
Time domain analysis
Topology
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Summary:This paper investigates an innovative negative group delay (NGD) theory of "li" geometrical shape topology. The li-topology is an outstandingly simple and fully distributed circuit comprised of a coupled line (CL). The li S-parameter model taking into account the CL coupling coefficient, delay and attenuation is established. The NGD analysis showing the possibility to generate NGD condition with respect to the li topology parameters is developed. The NGD characteristics as NGD value, center frequency, bandwidth, transmission and reflection coefficient are expressed. The li-NGD theory is validated with two proofs-of-concept implemented in microstrip technology. Calculated models, simulations and measurements are in good correlation. As expected, bandpass NGD presenting center frequency at approximately 2.56 GHz and 0.92 GHz with NGD level of approximately -0.9 ns and -3.7 ns were realized with the small and large li prototypes. Outstanding time-domain analyses explaining the bandpass NGD meaning, with innovatively low attenuation output, were also presented. The time-domain results highlight li-output pulse signal envelopes in time advance without violating the causality.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2979453