Abstract

Non-reciprocity is achieved with time-varying transmission line (TVTL) whose capacitance is modulated by a traveling wave carrier. Such a structure translates the difference in the propagating directions of the signals to the difference in modulation frequencies. By taking advantages of the low noise, broadband and frequency translation capability of TVTL, non-reciprocal RF front-ends capable of full-duplex communications can be constructed with a single antenna. Such front-ends pave the way for software defined radios as their operations are no longer subjected to the constraints of frequency diplexers.

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