S-Parameter Model of Three Parallel Interconnect Lines Generating Negative Group-Delay Effect

Wan, Fang; Li, Ningdong; Ravelo, Blaise; Ji, Qizheng; Ge, Jingpeng

doi:10.1109/access.2018.2872732

Cited by 22 publications

(25 citation statements)

References 43 publications

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“…A design method of NGD microwave circuits based on signal interference technique was introduced in [26]. An analysis of three parallel lines NGD structure was proposed in [27]. A transmission type NGD structure was developed in [28].…”

Section: Introductionmentioning

confidence: 99%

Negative Group Delay Theory on Li Topology

Ravelo

Wan

et al. 2020

IEEE Access

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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. INDEX TERMS Distributed circuit, li-topology, microwave theory, negative group delay (NGD), S-matrix modelling.

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Section: Introductionmentioning

confidence: 99%

Negative Group Delay Theory on Li Topology

Ravelo

Wan

et al. 2020

IEEE Access

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“…More specific modeling methodologies must be developed for predicting and understanding TL couplings. For example, it was found in [14][15][16][17], that the crosstalk between parallel coupled lines (CLs) can generate a particular phenomenon appearing with bandpass (BP) negative group delay (NGD). Basic study with coupling matrix approaches were conducted for analyzing the BP NGD effect [15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Basic study with coupling matrix approaches were conducted for analyzing the BP NGD effect [15][16]. This particular phenomenon which is actually not familiar to the EMC research communities was singularly found with signal interference [17].…”

Section: Introductionmentioning

confidence: 99%

“…To challenge to reduce the attenuation lower than 10 dB. The design feasibility of NGD distributed microwave circuit which may not need lumped circuits was confirmed [17,20]. Further challenge on the compact NGD circuit design was also made in [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…An NGD topology built with parallel interconnect line was theorized and designed. This parallel interconnect line NGD circuit is able to operate with attenuation of about 4 dB [17]. More recently, further design effort and conducted to design an NGD circuit consists of interconnect line coupled with a radial stub terminated line which presents 3.1 dB insertion loss [29].…”

Section: Introductionmentioning

confidence: 99%

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S-Matrix and Bandpass Negative Group Delay Innovative Theory of Ti-Geometrical Shape Microstrip Structure

Zhou

et al. 2020

IEEE Access

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A theoretical investigation of distributed microwave circuit built with Ti-shape topology is developed. The topology under study consists of neighbored T-and i-shape interconnect lines. The Titopology equivalent S-matrix is calculated as a function of crosstalk coupling coefficient and coupled line (CL) delay. To highlight the NGD modelling feasibility, parametric analyses with respect to the T-and ielement coupling and delay are introduced. More practical validation is carried out with designed, simulated and measured microstrip prototype. It is found that because of T-and i-crosstalk, the Ti topology can behave as a bandpass NGD function. A good NGD performance with NGD level of approximately-1 ns around the center frequencies 2.2 GHz with transmission coefficient of approximately-2.1 dB and reflection coefficient better than-14 dB. The measured results are in good agreement with calculated models and simulations. Two-cell Ti-NGD circuits were also investigated to illustrate the designability of the topology for multi-band and widened single band NGD responses.

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Analytical modeling of H‐shape distributed topology with bandpass negative group delay behavior

Wan

Ravelo

2020

Int J RF Microw Comput Aided Eng

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S-Parameter Model of Three Parallel Interconnect Lines Generating Negative Group-Delay Effect

Cited by 22 publications

References 43 publications

Negative Group Delay Theory on Li Topology

Negative Group Delay Theory on Li Topology

S-Matrix and Bandpass Negative Group Delay Innovative Theory of Ti-Geometrical Shape Microstrip Structure

Analytical modeling of H‐shape distributed topology with bandpass negative group delay behavior

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