Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 55, Issue 12, Pages 2599-2613Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2007.910082
Keywords
impedance matching; signal-centric systems; time-varying circuits
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A time-varying matching network is proposed for signal-centric systems. This matching network achieves significantly higher bandwidth than conventional designs with the same circuit topology and complexity. This is achieved by exploiting information about the incident pulse. Time-varying elements control the initial conditions of the reactive components so that excellent matching is obtained over a very wide frequency range. In particular, experimental and theoretical results show that a single-stage LC ladder with one single-pole double-through switch achieves a nearly perfect match with negligible dispersion for a monocycle with a 10:1 10-dB bandwidth. Unlike conventional matching networks, time-varying designs are not,limited by Bode-Fano gain-bandwidth restrictions, but only by the nonidealities of their circuit components. Moreover, it is experimentally shown that tunable time-varying designs reduce the reflected energy by 40%-45% and improve the transmitted energy efficiency of the same monocycles by 20%-25% compared to conventional tunable designs of the same complexity.
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