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This paper reviews the concept of dielectric resonator antennas (DRAs) scaled to nanometer dimensions for operation at infrared and visible wavelength. In comparison to resonant metallic structures which are affected by large plasmonic losses at optical frequencies, dielectric resonator nano-antennas appear very attractive since they are predominantly based on displacement currents. In this context,...
A chain of complementary split ring resonators (CSRRs) operating at terahertz frequencies have the potential to sustain surface plasmon polaritons (SPPs). As a first step, the transmission spectra of a 2D periodic array of scaled CSRRs operating at terahertz frequencies were obtained. A second investigation, explored the effect of a polydimethylsiloxane (PDMS) substrate on the resonance of CSRRs....
Changes in resonant frequencies of a winding can identify the location of breakdown during impulse tests. This is difficult with a uniform winding. We propose the use of concurrent UHF antenna and winding currents in order to locate breakdown. The work can be extended to identify partial discharge events in dry type transformers.
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