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Article type: Cover
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Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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Article type: Index
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Published: March 12, 2010
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Shinichi SUZUKI, Takayuki NAKAGAWA, Tetsuomi IKEDA
Article type: Article
Session ID: BCT2010-39
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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We have developed a wireless Hi-Vision TV (HDTV) camera, called the "Millimeter-wave Mobile Camera", which can transmit HDTV pictures with high-capacity and low delay. The link system for the camera uses millimeter-wave band (42GHz-band and 55Ghz-band) and diversity reception techniques including MIMO-OFDM transmission with the aim of high-capacity transmission and high link reliability. This paper describe the feature of the wireless HDTV camera system for outdoor and indoor environment and examples of employing the wireless HDTV camera in live TV program productions.
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Shuhei ODA, Kazuhiro KAMIMURA, Haruo HOSHINO, Katsunori AOKI, Makoto Y ...
Article type: Article
Session ID: BCT2010-40
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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In a best effort network, available bandwidth always changes. It is impossible to choice an appropriate transmission rate in case of real time video transmission over such network. We have already developed the video transmission system that controls the video encoding rate as well as way of re-transmission and error correction according to network congestion. In this paper, we introduce a new transmission device that has wide rate control range and more effective video coding method and the evaluation of performance of the device.
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Hiroki OHTA, Makoto ITAMI
Article type: Article
Session ID: BCT2010-41
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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The signal bandwidth is 5.57MHz(6MHz^*13/14) in the channel of digital broadcasting, and the distance resolution 54m of the delay profile. The transfer functions of two or more of digital broadcasting channels were connected, an equivalent signal band expanded, and it examined it concerning the technology that improved the analytical accuracy of the propagation property. In this paper, we examined the adjustment condition of the phase to connect the signal bands.
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Kazuya MURAKAMI, Teruaki IMAMURA, Shigeki MATSUZAKI, Yoshifumu SHIMOSH ...
Article type: Article
Session ID: BCT2010-42
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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When an overhead power transmission line is close to a Medium-Wave broadcasting antenna, facilities such as lattice steel towers, power lines, and ground wires, affect radiation characteristics of the antenna. In this paper, we investigate the influence of the power line facilities on the input impedance of an MW antenna. We consider a simplified model of a power line that consists of a thin conducting wire representing each tower with the tops of the towers joined by a ground wire and make a simulation for the simplified computer model using "Numerical Electromagnetics Code" (NEC). As a result, we estimate power line facilities which has a large influence on the input impedance of an MW antenna.
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[in Japanese], [in Japanese]
Article type: Article
Session ID: BCT2010-43
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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Yasuo MORIMOTO, Tadahiko MAEDA
Article type: Article
Session ID: BCT2010-44
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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It has been reported that the leakage current along the external side of the outer conductor of a feeding cable connected to a wideband antenna causes antenna measurement errors and ferrite cores are often used to reduce those errors. However, the practical loading configuration of ferrite cores is usually determined by trial and error and the quantitative analysis on the loading condition of ferrite cores is important. This report assesses the effect on the leakage-current-reduction by using ferrite cores in terms of the radiation pattern and input impedance measurements. Also, the combination use of baluns and ferrite cores is evaluated quantitatively for the wideband antenna radiation efficiency measurement.
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Shiori NAMBA, Wataru KODATE, Masahiro YAMAGUCHI, Shoji KAWAHITO, Nobor ...
Article type: Article
Session ID: BCT2010-45
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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An on-chip integrated magnetic field probe has been designed and fabricated using CMOS technology. This probe will be used for measuring the near field of LSI chip in order to evaluate noise component of RF currents inside the LSI chip. A sensor head of this probe was a 2-turn coil of size 20×100μm^2. An amplifier circuit was integrated in proximity to the coil to improve the sensitivity and S/N ratio. The input-output characteristic and the gain-frequency characteristic of the designed amplifier were measured. The difference between design and measurement value of the operating point, was observed which is due to voltage drop across the resistance of power line. Its gain was about 5dB and the cutoff frequency was about 5GHz. It was confirmed that the gain will be improved if the amplifier was designed considering with the impedance matching.
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Hideki UJIHARA, [in Japanese], Kazuhiro TAKEFUJI, Ryuichi ICHIKAWA, Ya ...
Article type: Article
Session ID: BCT2010-46
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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Measurement systems for very week radiation from ultra wide band communication equipments, which averaged radiation is measured with radio-meter method and long term integration after A/D conversion and sampled. The bandwidth is planed from 0.8GHz to over 26GHz, which is divided to 3 bands. The low band system and midband system are developed and evaluaged gain flactuation and correction, system noise temperature, and stability.
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Fujio AMEMIYA
Article type: Article
Session ID: BCT2010-47
Published: March 12, 2010
Released on J-STAGE: September 21, 2017
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Wide introduction of digital, high-speed and broad-band technologies in the field of electronic equipment and/or systems has resulted in a serious increase of complicated EMC problems. In particular, it had been urgent need how to estimate and make appropriate countermeasures on the radiated disturbance due to the conducted common mode disturbance at telecommunication ports of the equipment. This report presents the outline of the studies on both reproducing mechanism of the conducted common mode disturbance caused by the unbalance of the telecommunications line and the relationship between the conducted disturbance and the radiated disturbance from the line by using in-situ measurements at the experimental telecommunications line. Then the outline of the study on design methods with respect to accurate and reproducible probes for measuring the disturbance at multiple pair telecommunication ports is described. Finally, the background of the limits of conducted common mode (asymmetric mode) disturbance at telecommunication ports which are defined in CISPR 22 is overviewed on the basis of the outcomes of the studies mentioned above.
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Article type: Appendix
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Published: March 12, 2010
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Article type: Appendix
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Published: March 12, 2010
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Article type: Appendix
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Published: March 12, 2010
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