Shinshu University Distance-Learning Systern using Broadband-Internet via Microwave

In Shinshu University, the campuses are connected by a microwave network called SUNS (Shinshu University Campus Collaboration Network System), in which 7.5 GHz digital microwave with the transmission capacity of 19 Mbps is used. SUNS is mainly composed of two networks: one is a video and audio data network with bilateral communication and other is a computer data network. Distance learning system applying SUNS is widely used for intercampus- and interuniversity- lectures, extension lectures, meetings and conferences. In this paper, the network system configurations of SUNS and its application to the distance learning are introduced.Article信州大学教育システム研究開発センター紀要 6: 87-96(2000)departmental bulletin pape

Development of an Electromagnetic Wave Shielding Textile by Electroless Ni-Based Alloy Plating

A polyester nonwoven textile with Ni-based alloy coating was fabricated, and the effect of electromagnetic wave shielding was evaluated. The Ni-based was coated by electroless plating on the textile. The electromagnetic wave shielding effect of the textile with Ni-B coating was about 99.98% over the induction range of 6-13 GHz. Because the textile has thin, light, flexible, and breathable characteristics, it will be versatile for the various electromagnetic wave shielding applications.ArticleIEEE TRANSACTIONS ON MAGNETICS. 45(10):4173-4175 (2009)journal articl

Cross-Talk Suppression in High-Density Printed Circuit Boards Using Magnetic Composite Filled in Spacing Between Signal Lines

Recently, high-density printed circuit boards (HD-PCBs) with less than 50 mum/50 mum line/space has been developed. In the HD-PCB, since the spacing between adjacent signal lines becomes very small, the crosstalk electromagnetic interference among adjacent lines becomes serious. In general, in order to suppress the crosstalk, the ground line is located at the spacing between signal lines because of the decrease of mutual capacitance among adjacent signal lines. The authors have proposed a magnetic method for reducing the crosstalk. The composite magnetic material was filled in the spacing between signal lines instead of the ground line. The magnetic composite is composed of Fe-Si-B-Cr amorphous particles with a mean diameter of 6 mu m and epoxy resin. From the experiments using the PCB-TEG with a 130 mum/50 mum line/space and 25-mm line length, the crosstalk was suppressed in the wide frequency range by using the magnetic composite. In the case of using 51 vol.% amorphous composite, the crosstalk suppression was up to 20 dB around 1 GHz. The influence of the magnetic composite on the transmission and reflection in the main signal line was very small. Therefore, the proposed method is effective for crosstalk suppression without influence on the signal transmission.ArticleIEEE TRANSACTIONS ON MAGNETICS. 45(10):4801-4803 (2009)journal articl