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

Taochen Gu (Nanjing University of Information Science and Technology (NUIST), Nanjing, China)
Fayu Wan (Nanjing University of Information Science and Technology (NUIST), Nanjing, China)
Jamel Nebhen (Prince Sattam Bin Abdulaziz University, Al Kharj, Saudi Arabia)
Nour Mohammad Murad (Université de La Réunion, Institut Universitaire de Technologie de la Réunion, Saint-Pierre, La Réunion, France)
Jérôme Rossignol (Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS/UBFC, Dijon, France)
Sebastien Lallechere (Université Clermont Auvergne (UCA), Institut Pascal (IP), Clermont-Ferrand, France)
Blaise Ravelo (Nanjing University of Information Science and Technology (NUIST), Nanjing, China)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 14 July 2021

Issue publication date: 20 August 2021

44

Abstract

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).

Keywords

Citation

Gu, T., Wan, F., Nebhen, J., Murad, N.M., Rossignol, J., Lallechere, S. and Ravelo, B. (2021), "Bandpass NGD investigation of O-shape fully distributed structure with S-matrix modelling", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 40 No. 3, pp. 640-659. https://doi.org/10.1108/COMPEL-01-2021-0019

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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