Integrated Non-Reciprocal Components: Design, Applications and Future Directions

Surpassing the fundamental limits that govern all electromagnetic structures, such as reciprocity and the delay-bandwidth-size limit, will have a transformative impact on all applications based on electromagnetic circuits and systems. For instance, violating principles of reciprocity enables non-reciprocal components such as isolators and circulators, which find application in full-duplex wireless radios, radar, bio-medical imaging, and quantum computing systems. Overcoming the delay-bandwidth-size limit enables ultra-broadband yet extremely compact devices whose size is not fundamentally related to the wavelength at the operating frequency. The focus of my talk will be on using time-variance as a new toolbox to overcome these fundamental limits and re-imagine circuit design. Specifically, I will focus on non-magnetic time-varying circuits and systems that have enabled fully integrated non-reciprocal components operating across frequencies ranging from RF to mm-wave with extremely compact form-factor, multi-watt power handling and in-built isolation tuning. These prototypes achieve the stringent performance envelopes that are required by practical wireless applications, thus bringing the fields of integrated non-reciprocity to real-world applications.