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In this letter, a multifunctional Electromagnetic Band Gap Structure (EBGS) with ultra wideband absorption and narrow band transmission properties is designed. It is constructed by two kinds of Frequency Selective Surfaces (FSSs) and a piece of dielectric spacer. The top FSS is a split square ring loaded with resistors, the middle is a dielectric spacer, the bottom is a slot ring FSS. Simulation shows...
DC contactor is one of the key equipment in DC rail traction system. This paper proposes a 2 kV hybrid DC contactor based on natural current transfer. The topology consists of mechanical switch, solid-state switch, passive RCD circuits for snubber and dynamic voltage balancing, and MOV for absorption. Transient characteristics of current transfer, snubber and absorption are studied by theoretical...
A VO2 film with photonic crystal (PC) pattern is investigated and the optical absorption enhancement is significantly enhanced in near IR band. The structural parameters for PC are optimized to get a better performance.
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