https://doi.org/10.1051/epjap/2020200016
Regular Article
Negative group delay experimentation with tee connector and cable structures
1
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: blaise.ravelo@yahoo.fr
Received:
23
January
2020
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
