Defense Event

Advances in Emerging Electromagnetics Topics: Metamaterials and Wireless Power Transfer

Brian Tierney

PhD Candidate
Thursday, June 23, 2016
1:30pm - 3:30pm
1005 EECS

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About the Event

Since their introduction 15 years ago, metamaterials have enabled the design of various new and exotic electromagnetic devices. These devices have included polarization convertors, beam refractors, absorbers, wave collimators, and many others. However, unlocking the full potential of metamaterials requires improving existing design methods. For example, one popular design approach has been transformation electromagnetics, which exploits the form invariance of Maxwell’s equations under coordinate transformations. However, transformation techniques can often yield material parameters which are difficult to implement, e.g. highly-anisotropic or inherently-dispersive materials. In this thesis, alternative design techniques are proposed and demonstrated for tailoring electromagnetic waves. In particular, new methods are explored in two areas: (1) the generation of arbitrary radiation patterns using metamaterial leaky-wave antennas and (2) the design of compact, broadband metamaterial beamformers with multiple, prescribed output beams. In addition to metamaterial topics, this thesis also presents the design of a wireless non-radiative power transfer (WNPT) system that employs novel, compact, planar-loop resonators with integrated transmission lines and capacitive stubs. These high-Q resonators offer excellent coil-to-coil efficiencies and can be easily fabricated using standard printed-circuit board processes. Moreover, it is shown that the parameters of the resonator can be tailored to achieve a conjugate impedance-matched condition at a prescribed coupling distance, thereby eliminating the need for external matching networks.

Additional Information

Sponsor(s): ECE

Faculty Sponsor: Tony Grbic

Open to: Public