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Your search keyword '"Yamamoto, Manabu"' showing total 31 results
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31 results on '"Yamamoto, Manabu"'

13. Aircraft electromagnetic field estimation for wireless avionics intra-communication band using large-scale FDTD analysis — Field estimation of A320 class passenger aircraft at 4 GHz band

Author

Futatsumori, Shunichi, primary, Morioka, Kazuyuki, additional, Kohmura, Akiko, additional, Yonemoto, Naruto, additional, Hikage, Takashi, additional, Yahagi, Kanji, additional, Shirafune, Masami, additional, Yamamoto, Manabu, additional, Nojima, Toshio, additional, and Narahashi, Shoichi, additional

Published
2017
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16. Design of quasi-millimeter wave leaf-shaped bowtie array antenna for UWB applications

Author

Yamamoto, Manabu, Tokuyama, Daisuke, Nojima, Toshio, Yamamoto, Manabu, Tokuyama, Daisuke, and Nojima, Toshio

Abstract

© 2010 IEEE. Reprinted, with permission, from Yamamoto, M., Tokuyama, D., Nojima, T., Design of quasi-millimeter wave leaf-shaped bowtie array antenna for UWB applications, 2010 IEEE Antennas and Propagation Society International Symposium (APSURSI), Jul. 2010. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Hokkaido University products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Published
2010

27. Harmonic matching and reflecting amplifiers with 2nd and 3rd harmonic phase tuning.

Author

Hiraga, Ken, Hikage, Takashi, Yamamoto, Manabu, and Nojima, Toshio

Abstract

Efficiency of power amplifiers has been a major issue in the field of wireless transmitters and microwave power transmitters. Accordingly, many techniques for high efficiency have been proposed [1][2]. The use of class-F amplifiers has been considered to be one of the most effective approaches at microwave or higher frequencies. The drain efficiency is 100% for ideal class-F operation with an infinite number of harmonics in operating waveforms [2]. Such operation is realized with complete load conditions [3]. [ABSTRACT FROM PUBLISHER]

Published
2012

28. A study of a leaf-shaped bowtie slot antenna for UWB applications.

Author

Fujita, Soh, Yamamoto, Manabu, and Nojima, Toshio

Abstract

Ultra-wideband (UWB) radio technology has recently attracted considerable attention for various applications, such as short-range high-speed communication, sensor networks, radar and location tracking. The Federal Communications Commission (FCC) announced its decision to allow the unlicensed use of the frequency band from 3.1GHz to 10.6 GHz for UWB radio systems in 2002. Since then, many research groups have reported various kinds of UWB antennas. In particular, planar-type UWB antennas have attracted significant research power in the past few years. For example, Schantz proposed various new designs such as magnetic slot antennas [1] and planar elliptical dipole antennas [2]. Chen et al. investigated the characteristics of a few types of square dipole antennas [3] and also proposed the bi-arm rolled monopole [4]. [ABSTRACT FROM PUBLISHER]

Published
2012

29. Analysis of Multiplexed Holograms Recording by Using a Two-Dimensional Beam Propagation Method.

Author

Yoshida, Shuhei, Saitoh, Motoaki, Yoshida, Naruki, and Yamamoto, Manabu

Subjects
HOLOGRAPHIC memory (Computers), PHOTOPOLYMERS, INFORMATION retrieval, OPTICAL diffraction, WAVE analysis
Abstract

Photopolymers are suitable for a medium of holographic data storages and stable media with high diffraction efficiency. The reaction process of such photopolymers proceeds based on elementary reactions and it is highly complicated. In present work, we have simulated formation of diffraction gratings in photopolymers, and analyzed their diffraction characteristics according to the beam propagation method. Using this method, we obtained diffraction characteristics that are otherwise difficult to analyze by conventional methods based such as coupled-wave analysis. In addition, we also performed experiment for evaluation of recording characteristics of photopolymers by interference fringe recording. It is our expectation that the results of present work will provide beneficial information for the implementation of holographic data storage. [ABSTRACT FROM AUTHOR]

Published
2009
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30. A Technique for Determining the Normalized Impedance of Slots in the Image Plane of the Image NRDG.

Author

Chirwa, Lawrence C., Yamamoto, Manabu, Omiya, Manabu, and Itoh, Kiyohiko

Subjects
*ELECTRIC impedance, *ELECTRIC distortion
Abstract

Examines the method for determining the normalized impedance of a transverse slot in the image plane of the nonradiative dielectric guide image. Distortion technique caused by scattered evanescent fields; Determination of normalized slot impedance; Confirmation of the method reliability.

Published
2001
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