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Frequency-Independent Active Phase Shifters for UWB applications

Blaise Ravelo 1, 2 Marc Le Roy 2, * André Pérennec 2
* Corresponding author
2 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 : This paper describes an active phase shifter, which exhibits a frequency-independent phase shift over the ultrawideband (UWB) frequency range. The design of this pure phase shifter relies on the use of a negative group delay (NGD) circuit. The topology of the active NGD cell is based on a Field Effect Transistor in cascade with a series resonant network. A 90°±5° phase shifter with a single NGD stage was designed, at first, and implemented in hybrid microstrip technology; its measurements showed a 75% relative bandwidth and validated the proposed approach. Then, a compact pure phase shifter with a multi-stage NGD cell was designed. It was aimed at meeting specifications in the UWB frequency range, i.e. 3.1-10.6 GHz (110% relative band). Over this band, the corresponding simulation results showed a constant transmission phase of -45°±3°, an insertion gain from 2 to 5.5 dB and insertion losses better than 9 dB.
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Blaise Ravelo, Marc Le Roy, André Pérennec. Frequency-Independent Active Phase Shifters for UWB applications. 40th European Microwave Conference, Sep 2010, Paris, France. pp.1774-1777, ⟨10.978-2-87487-016-3 © 2010 EuMA⟩. ⟨hal-00524304⟩

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