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Dc microgrids including grid-tied inverter, energy storage system, and distributed generations have the advantage of high efficiency as compared to the ac system. Droop control has been realized to suppress the current mismatching among distributed sources. However, the conventional droop control involves distribution loss due to the line impedance. In this paper, a novel droop control is proposed...
This paper reports a highly sensitive mediator-free glucose biosensor based on miniaturized radio frequency resonator fabricated on Gallium Arsenide substrate using integrated passive device technology. The level of electromagnetic coupling between coupled stepped-impedance resonators, which significantly determines the resonator characteristics, is perturbed enough by a glucose sample. As a result,...
This paper presents a rapid and sensitive mediator-free glucose biosensor based on microwave resonator implemented using circularly folded T-shaped uniform impedance resonators, screen printed on flexible polyethylene substrate. As a result of high-Q factor of 160, the proposed glucose biosensor features high sensitivity and ultralow detection limit of 71 MHz/mgmL−1 and 0.0167 μM, respectively, at...
In a weak grid condition, the precise grid impedance estimation is essential to guaranty the high performance current control and power transfer for a grid-connected inverter. This paper proposes a precise estimation method for grid impedance by P-Q variations employing a decoupled injection of reference currents. The operation principle of grid impedance estimation is fully presented, and the negative...
Electrochemical deposition of gold nanoparticles (Au NPs) on the gold multi-electrode array (MEA) fabricated with bi-layer lift-off resist sputter-deposition technique was performed. Electrochemical deposition was performed by potentiostatic and cyclic voltammetry method. The surface of Au NP-modified electrode showed various morphologies with applied voltage and the concentration of HAuCl4 solution...
The charging characteristics of non-radiative wireless power link (NWPL) have been well unknown. This paper shows that series-series (SS) compensated NWPL system behaves as a constant current power supply when the inverter operates at the resonant frequency of self-inductance and resonant capacitors.
In this paper, the 8+1-layer coreless substrate of fcBGA will be introduced, which was revised from the 12-layer core substrate. This coreless substrate was manufactured in Shinko using an advanced ABF film (GZ41) having low CTE for lower warpage and better assembly performance. To evaluate and verify the electrical performance, the fabricated coreless substrate was measured for S- and Z-parameters...
This paper proposes a power combining amplifier based on composite right/left-handed (CRLH) transmission line. The circuits using proposed technique consist of the CRLH transmission line, that are series capacitors, shunt inductors and a right-handed (RH) transmission line, to replace the parallel capacitors and transmission line to satisfy matching conditions and to combine power. As a result, the...
This paper introduces a rat-race coupler, with size reduction and bandwidth enhancement, using shunt capacitors, high impedance lines and Composite Right/Left-Handed Transmission Lines (CRLH-TLs). The reduced method of line length is used to combine a short length high impedance line and two shunt capacitors. Also, there is combined CRLH meta-material, using nonlinear phase characteristic of CRLH-TL...
We present the design approach, realization and test results of the Q-band precision subminiature coaxial adaptor. Coaxial adaptor based on transmission line theory using multi-step impedance and coaxial discontinuities to increase its cutoff frequency. The return-loss increments due to the hooked structure and multi air-holes are minimized to 2 dB and 1.5 dB, respectively. VSWR of < 1.2 is obtained...
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