Abstract

An original application of stopband (SB) type negative group delay (NGD) electronic function is introduced. The unfamiliar SB-NGD circuit is designed with RLC-network lumped passive topology. The SB-NGD circuit is exploited to operate as a true-time delay (TTD) device for smart dual-beam phased array design. The two-port passive topology for designing an SB-NGD circuit constituted by an RLC-network is described. The theory and design method of the employed SB-NGD passive circuit are detailed. The microwave theory of the SB-NGD topology is elaborated from S-matrix modelling. The SB-NGD canonical form is innovatively introduced in function of the expected specifications. The synthesis design equations allowing to determine the R, L and C component values in function of the NGD specifications are formulated. The SB-NGD behavior is verified by comparison of calculated and simulated S-parameters from two different proofs-of-concept (POC). Illustrative results with a very good agreement showing SB-NGD behavior are observed around the arbitrarily chosen central frequencies f₁ = 0.7 GHz and f₂ = 1 GHz over a bandwidth of 50 MHz. The design principle of TTD-based smart dual-beam is described. The dual-band SB-NGD circuit is designed to operate as a dual-band TTD device with fixed delays at t₁(f₁) = 357 ps and t₂(f₂) = 875 ps, respectively. A radiation pattern showing the smart dual-beam steering operating system at f₁ and f₂ frequencies is discussed.

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Prof. Blaise Ravelo

Dr. Glauco Fontgalland

Dr. Ana Paula B. Dos Santos

Dr. Hugerles S. Silva

Dr. Nour Mohammad Murad

Dr. Fayrouz Haddad

Dr. Mathieu Guerin

Dr. Wenceslas Rahajandraibe

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