Eur. Phys. J. Appl. Phys.
Volume 91, Number 1, July 2020
|Number of page(s)||11|
|Section||Physics of Energy Transfer, Conversion and Storage|
|Published online||30 July 2020|
Negative group delay experimentation with tee connector and cable structures
Nanjing University of Information Science & Technology, Nanjing, China
2 Amity University Haryana, Gurgaon, 122413 India
3 Université Clermont Auvergne, Institut Pascal, SIGMA Clermont, 4 av Blaise Pascal, 63178 Aubière, France
* e-mail: email@example.com
Received in final form: 11 May 2020
Accepted: 8 June 2020
Published online: 30 July 2020
The unfamiliar negative group-delay (NGD) phenomenon is experimented with structure constituted by tee-connectors and coaxial cables. The topology of the NGD generator is described. It consists of two parallel 50-Ω characteristic impedance cables. The S-parameter model in function of the cable physical lengths is established. The existence condition enabling to understand the NGD phenomenon is defined. A proof of concept simply is constituted by two three-port SMA connectors, three SMA transitions and 13-cm length cables. The NGD experimentation is performed from 1.5 GHz to 3.5 GHz. Tri-band NGD aspects in good agreement with the theory and simulation is observed experimentally. Particularly, high figure-of-merit NGD circuit with −3 ns NGD level, less than 2 dB insertion loss and 12 dB return loss around 3 GHz centre frequency is measured.
© EDP Sciences, 2020
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