Electromagnetic Cavity Resonance Equalization With Bandpass Negative Group Delay

Ravelo, Blaise; Lalléchère, Sébastien; Rahajandraibe, Wenceslas; Wan, Fang

doi:10.1109/temc.2021.3051100

Cited by 23 publications

(19 citation statements)

References 44 publications

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“…The proposed BP NGD circuit can be used for many potential applications in the future: Against the GD effects in the RF, wireless, and telecommunication systems as phase shifter design (Wan, Ji and Ravelo, 2019) And the resonance effect reduction in the PCB and also for the avoidance of EMC effect (Nebhen & Ravelo, 2021; Ravelo, Lalléchère, et al., 2021; Ravelo,Wan, Nebhen, et al., 2021). …”

Section: Discussionmentioning

confidence: 99%

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Nebhen

Chan

et al. 2021

Radio Science

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In this paper, new bridged‐T network operating with bandpass (BP) negative group delay (NGD) function is introduced. The circuit design is innovatively based on an inductorless passive RC‐network. The innovative bridged‐T topology is implemented with a R‐shunt configuration. The analytical transfer function of voltages and equivalent impedance‐matrix are carefully calculated. The BP NGD analysis and design of the bridged‐T topology is developed. The BP NGD properties and specifications are analytically investigated. A proof of concept of R‐shunt bridged‐T prototype with a surface‐mounted device printed circuit board is designed, fabricated, and measured to verify the BP NGD behavior from theoretical equations and simulations. As expected, the theoretical, simulation, and measurements results are in very good agreement. From measurement results, the fabricated BP NGD C‐shunt bridged‐T reaches a delay of about −45 ns and a center frequency of about 0.5 MHz over a −3 dB attenuation.

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Section: Discussionmentioning

confidence: 99%

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Nebhen

Chan

et al. 2021

Radio Science

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“…And the reduction technique of resonance effect for the electromagnetic compatibility application (Ravelo et al, 2021a(Ravelo et al, , 2021b(Ravelo et al, , 2021c.…”

Section: Discussionmentioning

confidence: 99%

“…Because of its intriguing property, the NGD effect attracts the attention of RF and microwave design engineering researchers (Siddiqui et al, 2003;Markley and Eleftheriades, 2010;Al-Bawri et al, 2020;Monti and Tarricone, 2009;Bukhman and Bukhman, 2004;Ahn et al, 2009;Chaudhary and Jeong, 2016;Sanchez-Soriano et al, 2018;Bridges, 2011a, 2011b;Ravelo, 2014aRavelo, , 2014b and (Wang et al, 2018;Chaudhary and Jeong, 2015;Das et al, 2018;Bridges, 2011a, 2011b;Zhang et al, 2017;Wan et al, 2018;Zhou et al, 2020;Ravelo et al, 2021aRavelo et al, , 2021bRavelo et al, , 2021c. Significant development of NGD Bandpass NGD investigation microwave circuits has been made with various structures (Siddiqui et al, 2003;Markley and Eleftheriades, 2010;Al-Bawri et al, 2020;Monti and Tarricone, 2009;Bukhman and Bukhman, 2004;Ahn et al, 2009;Chaudhary and Jeong, 2015;Sanchez-Soriano et al, 2018;Bridges, 2011a, 2011b;Ravelo, 2014aRavelo, , 2014b and (Wang et al, 2018;Chaudhary and Jeong, 2015;Das et al, 2018;Bridges, 2011a, 2011b;Zhang et al, 2017;.…”

Section: Introductionmentioning

confidence: 99%

“…In this period, the different contributions (Chaudhary and Jeong, 2015;Das et al, 2018;Bridges, 2011a, 2011b;Zhang et al, 2017; were on the design of microwave BP NGD circuit capable to operate beyond gigahertz with low insertion better, for example, less than 10 dB. The low loss of BP NGD topologies proposed was based on the use of TLs (Chaudhary and Jeong, 2015;Das et al, 2018;Wan et al, 2018;Zhou et al, 2020;Ravelo et al, 2021aRavelo et al, , 2021bRavelo et al, , 2021c. The simpler NGD topologies enable to perform deep mathematical NGD analysis and even somehow to establish the NGD design equations.…”

Section: Introductionmentioning

confidence: 99%

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Bandpass NGD investigation of O-shape fully distributed structure with S-matrix modelling

Wan

Nebhen

et al. 2021

COMPEL

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Purpose The aim of this paper is to provide the theoretical conceptualization of a bandpass (BP) negative group delay (NGD) microstrip circuit. The main objective is to provide a theorization of the particular geometry of the microstrip circuit with experimental validation of the NGD effect. Design/methodology/approach The methodology followed in this work is organized in three steps. A theoretical model is established of equivalent S-parameters model using Y-matrix analysis. The GD analysis is also presented by showing that the circuit presents a possibility to generate NGD function around certain frequencies. To validate the theoretical model, as proof-of-concept (POC), a microstrip prototype is designed, fabricated and tested. Findings This work clearly highlighted the modelled (analytical design model), simulated (ADS simulation tool) and measured results are in good correlation. Relying on the proposed theoretical, numerical and experimental models, the BP NGD behaviour is validated successfully with GD responses specified by the NGD centre frequency: it is observed around 2.35 GHz, with an NGD value of about −2 ns. Research limitations/implications It is to be noticed the proposed GD analysis requires limitations of the theoretical NGD model. It is depicted and validated through a POC demonstrating that the circuit presents a possibility to generate NGD function around certain frequencies (assuming constraints around usable frequency and bandwidth). Practical implications The NGD O-shape topology developed in this work could be exploited in the future in the microwave and radiofrequency context. Thus, it is expected to develop GD equalization technique for radiofrequency and microwave filters, GD compensation of oscillators, filters and communication systems, design of broadband switch-less bi-directional amplifiers, efficient enhancement of feedforward amplifiers, design method of frequency independent phase shifters with negligible delay, synthesis method of arbitrary-angle beamforming antennas. The BP NGD behavior may also be successfully used for the reduction of resonance effect for the electronic compatibility (EMC) of electronic devices. Social implications The non-conventional NGD O-circuit theoretical development and validation through experimental POC could be exploited by academic and industrial developers in the area of wireless communications including, but not restricted to, 5-generation communication systems. The use of the remarkable NGD effect is also useful for the mitigation of electromagnetic interferences between electronic devices and more and more complex electromagnetic environment (current development of Internet of Things[ IoT]). Originality/value The originality of this work relies on the new NGD design proposed in this work including the extraction of S-matrix parameters of the microstrip novel structure designed. The validation process based upon an experimental POC showed very interesting levels of NGD O-circuit (nanosecond-GD duration).

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“…The optimal value of the FoM is obtained from the derivation with respect to the minimal magnitude: (38) It can be analytically demonstrated that the derived magnitude optimal value is equal to: (39) Substituting this last value into equation (37), we obtain the maximum value of FoMn equal to: (40)…”

Section: B Optimal Value Of Bp Ngd Fommentioning

confidence: 99%

Band Pass Negative Group Delay demonstration on a VHF RLC parallel passive lumped circuit

Sambatra¹,

Boussougou

Ramifidisoa

et al. 2022

AEM

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This paper demonstrates the bandpass (BP) negative group delay (NGD) function on a passive RLC-parallel lumped network at Very High Frequencies (VHF). After the topological description of the RLC cell, the BP NGD analysis is introduced. The NGD circuit is modelled theoretical by means of voltage transfer function (VTF) expression. The analytical equations illustrating the BP NGD specifications as the NGD center frequency, NGD value, NGD bandwidth and the VTF attenuation are established in function of the R, L and C component parameters. A proof of concept is designed, fabricated as a SMD on printed circuit board, and measured. As expected, the different models (calculated, simulated and measured) present a BP NGD and are significantly corelated. The POC prototype (resp the calculated and simulated model), presents an NGD value of - 8 ns (resp -12 ns) and attenuation of - 10 dB (resp -8 dB) around a 225 MHz (resp 240 MHz) NGD center frequency. Uncertainties analysis (UA) of BP NGD specifications is also studied in order to show the influence of quality and tolerance of components for NGD circuit. The theoretical formulas of NGD specification UAs in function of R, L and C tolerances are derived. UAs with respect to 1%, 2% and 5% relative tolerances of R, L and C components constituting the POC designed circuit are performed.

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Electromagnetic Cavity Resonance Equalization With Bandpass Negative Group Delay

Cited by 23 publications

References 44 publications

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Bandpass NGD investigation of O-shape fully distributed structure with S-matrix modelling

Band Pass Negative Group Delay demonstration on a VHF RLC parallel passive lumped circuit

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