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Abstract: Arrays of
dielectric resonators—illuminated by an antenna—are used to ignite and
sustain multiple microwave plasmas in parallel. A reconfigurable metamaterial could be
developed with dielectric resonators providing negative permeability and plasma
providing controllable negative permittivity. To generate plasma, cylindrical resonators
of calcium titanate were arranged in a linear ... read morearray with separation distances between
0.5 and 5 mm. The operating frequency was near the HEM111 resonance of 1.1 GHz.
Sustaining of argon plasma between 0.5 Torr and 1 atm within the array is found to alter
the electromagnetic scattering from the dielectric resonators. A relationship was
discovered between permittivity and the strength of the coupled electric field.
Experimentally, breakdown did not occur for dielectric resonators with low (<40) or
high (>800) relative permittivity. Field simulations show a broad maximum in the
microwave field generated on the external boundary of the resonators, peaking around
ϵ_r ~ 200.
Thesis (M.S.)--Tufts University,
2017.
Submitted to the Dept. of Electrical
Engineering.
Advisor: Jeffery
Hopwood.
Committee: Sameer Sonkusale, and Thomas
Vandervelde.
Keyword: Electrical
engineering.read less
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