Abstract

This paper introduces a hybrid coupler based negative group delay (NGD) topology. The NGD circuit is built with a hybrid coupler with one of output and isolated access ways connected in feedback with a lossy transmission line (TL). It is modelled by S-parameter approach. The NGD topology characteristics are formulated. The synthesis relations enabling to determine the NGD circuit parameters in function of the desired NGD value are extracted. Parametric analyses in function of the TL attenuation and time-delay are discussed.

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