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Application of negative group delay active circuits to the design of broadband and constant phase shifters

Blaise Ravelo 1 Marc Le Roy 1, * André Pérennec 1
* Corresponding author
1 Lab-STICC_UBO_MOM_DIM
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
Abstract : The new phase-shifter configuration described in this report uses a negative group delay (NGD) active circuit. In this topology, a classical transmission line is set in cascade with an NGD circuit whose phase slopes are alike, but opposite, to get a constant and broadband phase shift. The proposed approach was validated through the design and measurement of a phase shifter, which exhibited a constant phase of 90° +- 5° over a 75% relative bandwidth around 1.6 GHz. Moreover, as the group delay of the NGD circuit compensated the transmission line one, the overall circuit group delay was kept to a small value in the operating frequency band.
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Blaise Ravelo, Marc Le Roy, André Pérennec. Application of negative group delay active circuits to the design of broadband and constant phase shifters. Microwave and Optical Technology Letters, Wiley, 2008, 50 (12), pp.3079-3081. ⟨10.1002/mop.23883⟩. ⟨hal-00468012⟩

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