Electromagnetic Cavity Resonance Equalization with Bandpass Negative Group Delay

Blaise Ravelo , Sébastien Lalléchère (1) , Wenceslas Rahajandraibe (2) , Fayu Wan

1 UCA - Université Clermont Auvergne
2 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

This paper deals with an original equalization method of 3-D electromagnetic (EM) cavity resonance by using bandpass negative group delay (NGD) function. Based on the equivalent circuit, the S-matrix model of the equalized EM cavity is introduced. The design equations of the NGD function are established in function of the cavity physical parameters. The feasibility of the equalization method is validated with a 42×28×3.8 cm rectangular cavity containing two communicating monopole antennas. By considering the TE110-mode, a significant equalization is realized with improvement of transmission coefficient flatness from 4-dB to less than 0.3-dB. In addition to the magnitude, the NGD equalization method enables to outstandingly reduce spikes of 3-D EM cavity group delay. With the proof of concept, the GD is reduced from more than 4-ns into 1-ns.

Mots clés: Bandpass negative group delay (NGD); 3-D Electromagnetic cavity; EMI; Equalization method; Equivalent circuit; Synthesis equation

Domaines: Sciences de l'ingénieur [physics]

Blaise Ravelo, Sébastien Lalléchère, Wenceslas Rahajandraibe, Fayu Wan. Electromagnetic Cavity Resonance Equalization with Bandpass Negative Group Delay. IEEE Transactions on Electromagnetic Compatibility, 2021, 63 (4), pp.1248-1257. ⟨10.1109/TEMC.2021.3051100⟩. ⟨hal-03606635⟩