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2002 3rd International Conference on Microwave and Millimeter Wave Technology

作者： ooi ban leong Zeng Rong leong Mook Seng Department of Electrical ＆ Computer Engineering National University of Singapore 10 Kent Ridge CrescentSingapore 119260

ISBN: (纸本)078037486X

＜正＞An approximate simulation method has been developed for the shielding effectiveness of a rectangular enclosure with arbitrarily shaped apertures. Mutual coupling between these apertures is *** computation of the shielding effectiveness is in good agreement with measurements. Index Terms:Aperture,circuit modeling,electromagnetic compatibility,electrical equipment enclosure, electromagnetic shielding.

关键词： packaging electromagnetic shielding mode matching coupled mode analysis electromagnetic compatibility computational electromagnetics metallic rectangular enclosures arbitrarily shaped apertures approximate shielding effectiveness simulation approximate simulation methods mode matching methods aperture mutual coupling electromagnetic compatibility EMC electrical equipment enclosures electromagnetic shielding

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Compact CPW-to Microstrip transition design for MMIC packaging

Compact CPW-to Microstrip transition design for MMIC packagi...

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2006 7th International Symposium on Antennas, Propagation and EM Theory

作者： Yijing Fan ban leong ooi leong Mook Seng National University of Singapore Dept of ECE10 Kent Ridge CrescentSingapore 119260

In MMIC circuit design,the transitions and interconnects are essential components for integration and packaging[1-3].However,the conventional distributed type transition circuits will result in great loss owing to their huge size,most especially in medium and low frequency *** this paper,a new CPW-to-Microstrip transition design based on lumped element circuits is *** optimized design can achieve a return loss of less than 10 dB from 3 to 14GHz and insertion loss of less than 1 dB from 3 to 14GHz.

关键词： CPW Compact CPW-to Microstrip transition design for MMIC packaging

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CFD Modeling of Rotating Spiral Wound Membrane with Corrugated Spacer： Shear Rate Effect

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材料科学与工程（中英文版） 2011年第2期5卷 234-238页

作者： Abdul LatifAhmad ban Zhen Hong ooi Boon Seng School of Chemical Engineering Engineering Campus Seri Ampangan Universiti Sains Malaysia Nibong Tebal Pulau Pinang14300 Malaysia

Shear rate is proven in many studies to be playing an important role in reducing the concentration polarization and membrane fouling. This paper investigates the effect of rotation speed of corrugated spacer on the shear rate using computational fluid dynamics (CFD). Two small channels with the inner membrane (IM) 39 mm from the axis of rotation and outer membrane (OM) with 41.5 mm were used for the studies. The inlet pressure is set as 100 kPa and water is used to study the shear stress on the rotating membrane. The average surface shear rate between the two membranes is found out to be increasing with the rotation. The average shear rate on stationary membrane is 25,645 s-1 and increased to 46,961 s-1 at rotation speed of 250 rad/s. The shear rate of OM is larger than IM when the rotation speed is lower than 75 rad/s but the shear rate on IM is larger when rotation speed is higher than 75 rad/s. The rotation of corrugated spacer can be applied to the spiral wound membrane module to increase the shear rate and thus increase the permeate flux and reduce the concentration polarization.

关键词： Shear rate dynamic membrane rotation

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