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This paper presents a novel multifunctional liquid lens (MLL) for miniature cameras. MLL firstly offers concurrent variable-focus and variable-zoom functions in a single lens system using two different actuation schemes: electrowetting-on-dielectric (EWOD) actuation for controlling the lens curvature and electromagnetic actuation for controlling the lens position. Image focus test is firstly carried...
An improved small-sized filter is presented for ultra-wideband (UWB) systems. The filter comprises an only one-cell composite right and left handed-transmission line (CRLH-TL) resonator, step impedance (SI), and two spurlines. The one-cell CRLH-TL resonator has a small area and a wide passband. An SI is used to suppress the harmonics of the passband. And the two spurlines nestle the one-cell CRLH-TL...
When a bubble hanging on a piezocantilever is excited by an acoustic wave around its resonant frequency, it oscillates and simultaneously generates cavitational microstreaming around it. The microstreaming bends the piezocantilever with fine vibration, resulting in electric power generation from the piezocantilever. In this study, we explore the dynamic behaviors of an acoustically oscillating bubble...
A novel on-chip bubble-separator has been developed where microparticles in an aqueous medium are separated and collected by size using an acoustically excited bubble as a mechanical filter. The concept of the bubble-separator is experimentally verified: bubble manipulation (generating and transporting operations) and micro-object manipulation (selectively capturing, carrying, and releasing operations)...
This paper presents a new design of tunable liquid lens operated by electromagnetic actuation for autofocus (AF) in miniature cameras and its optical performance is experimentally verified. When an electrical voltage is applied to an electric coil inside the electromagnetic system beneath the liquid lens, a magnetic field is generated around the electromagnetic system based on Faraday's law of induction...
High voltage cryogenic insulation issues need to be addressed in order to promote the commercialization of high temperature superconducting (HTS) equipment. One of the critical components for superconducting devices is the bushing whose role is to safely supply high current to the device. Due to a steep temperature gradient, commercial bushings which have been insulated with SF6 gas could not be directly...
In this paper, we propose a new architecture for a closed-loop controlled antenna tuning unit (ATU) system (only transmitting path is shown). In contrast to previous work, no analog-to-digital converters (ADCs) are used. Using the ATU, the narrow instantaneous bandwidth of an electrically small antenna (ESA) is automatically tuned over a much wider frequency range by the ATU. This matching scheme...
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