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Phase-Sensitive Dynamic Filtering with Time-Varying Transmission Line Filters


Bandpass filters play an integral role in virtually all communications systems. However, their constraints often clash with the increasing need for frequency and bandwidth resources. With this problem arises the need to be able to tune filters in real time. Dynamic filters can be used to address some of the traditional concerns regarding spectrum utilization and rapid frequency/phase shifts. These are filters that can be tuned in real time, with switching speeds faster than the symbol rate of a signal, and time constants longer than the symbol periods, enabling fast switching with negligible charge decay/pulsing. In this thesis, we propose IIR filters to provide an adequate basis in demonstrating the theory behind the dynamic filters, and the Time-Varying Transmission Line (TVTL) as an adequate candidate for realizing these filters. The theory of the dynamic bandpass filters is explored with a potential application utilizing such filters in the front end of a full-duplex communications system.

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