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Accurately estimating the core power losses under the trapezoidal induction waveform, and analyzing its variation with the duty cycle, are essential for the elaborate design of high-frequency transformers used in dual-active-bridge (DAB) dc-dc converters. In this paper, core power losses under trapezoidal induction waveform are theoretically predicted by considering the specific role of hysteresis,...
A century-long quest for realizing superdirective antennas has got a new lease of life with the advent of metamaterials: Arrays of coupled meta-atoms capable of carrying slow short-wavelength magneto-inductive waves were shown to be promising candidates for realizing rapidly varying current distributions required for superdirectivity. This paper provides an overview of our work towards realizing a...
Intensity modulated probe is utilized in coherent BOTDA sensor to reduce chromatic dispersion effect instead of phase modulated probe. Reduction of ∼6-MHz decoding error in Brillouin gain spectrum is achieved along 40-km sensing distance.
Wireless power transfer (WPT) via magnetic resonant coupling (MRC) proposed by a research team of Massachusetts Institute of Technology (MIT) in 2007 [1], has caused increasing interest in research and development of WPT technology. The WPT coils which are operated with the same resonance frequency are the core of the MRC-WPT. Until now, there have been two basic structures to implement MRC-WPT system...
The via effect has a big impact to the loss of the entire channel. To characterize the loss of a stripline design without the via contribution is very important for a designer to evaluate the dielectric material selection and the manufacturing process control. In this paper, an effective methodology, namely Delta-L, was proposed to remove the via effect efficiently and characterize the board electrical...
The change in dielectric properties of wire insulation due to various degradation processes is significant for health management of air- and spacecraft. Polytetrafluoroethylene (PTFE) and ethylene-tetrafluoroethylene (ETFE) are two fluoropolymers which have been widely applied as wiring insulation materials. This paper investigates the dielectric response of PTFE and ETFE to thermal exposure for up...
An on-chip circuit to measure static phase offset between a reference signal and the feedback signal of a PLL (phase-locked loop) is designed using only digital elements. It is demonstrated in a 65 nm, 1.0 V CMOS technology. It has a measured resolution of 2 ps and a range of more than +/-100 ps of phase offset and, and consumes 3 mW of power at 1 GHz. It uses an on-chip calibration referred to the...
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