ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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33.3
Displaying 1-29 of 29 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_Toc1
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  • Improvement of PSO and hybridization
    Keiji Kawakami, Zhiqi Meng
    Article type: Article
    Session ID: BCT2009-1
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A new technique titled "Particle Refresh" is introduced to particle swarm optimization (PSO) and a hybridization with conjugate gradient method is also discussed in this paper. The particle refresh charges power to inactive particle to improve the recovery ability of PSO after trapping on a local solution, and as a result, it becomes easy to choose suitable values for control-parameters to keep high performance for diverse objective functions. On the other hand, the point of the hybridization is how to determine the changeover timing between a conjugate gradient method and a PSO algorithm.
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  • Study on improvement of link quality for Ka-band multibeam satellite broadcasting I
    Hiroyuki Muraoka, Kiyotaka Fujisaki, Mitsuo Tateiba
    Article type: Article
    Session ID: BCT2009-2
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, the beam arrangement method is examined for satellite broadcasting that uses the next generation Ka-band multibeam satellite aiming at the improvement of the broadcasting quality. Moreover, it reports on the result of aiming at the improvement of utilization rates by changing the reception antenna diameter at the region where measures on the satellite side are not easy.
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  • Development of bit error generation method for satellite communication based on the received signal level fading I
    Shunpei Matsuda, Kiyotaka Fujisaki, Mitsuo Tateiba
    Article type: Article
    Session ID: BCT2009-3
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, the influence of the rainfall on the satellite communication link is statistically evaluated from the data of the received signal level and bit error (BE) obtained from the satellite communication experiment, and the bit error generation method are shown for the development of bit error generation method on satellite link. First the influence of the rainfall on the downlink is extracted, and the feature of BE under this condition is shown. Next, the coefficient of variation is introduced into a bit error generation method proposed by us, and the result is shown.
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  • On Hand Over of A Mobile Station in Cellular Electromagnetic Environments
    Yoshiyuki NAGAYASU, Kazunori UCHIDA, Hironori FUJII, Mayumi NAKAGAWA, ...
    Article type: Article
    Session ID: BCT2009-4
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper is concerned with providing a simple algorithm for a computer simulation of electric field distributions to keep a better quality of communications in relation to the hand over between a mobile station and base stations. The cell geometry is assumed to be a honeycomb structure with a base station at the center of each regular hexagon, and it is also assumed that a mobile station walks randomly among some cells. The incident waves from base stations and their reflected waves from a ground plane are included to approximately compute the electric field distributions. Moreover the effect of buildings on propagation is included and changed in each cell by the power of path distances based on the statistical propagation characteristics.
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  • DRTM Simulation for Electromagnetic Wave Propagation along Ground Plane with Arbitrary Shape
    Junichi Honda, Taro Tamaki, Kazunori Uchida
    Article type: Article
    Session ID: BCT2009-5
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_17
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    This paper is concerned with a Discrete Ray Tracing Method (DRTM) for the electromagnetic wave propagation along ground plane with arbitrary shape. The DRTM carries out two types of discretizations. One is discretization of rough surface, and the othre is discretization of serching ray. Much computation time can be saved by this operations. In the numerical result, we first make arbitrary shapes of ground plane by using a map data and calculate electromagnetic field distribution along it. Ray distributions are shown and the effect of diffraction in the shadowing region is discussed.
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  • Electromagnetic waves diffracted by two horizontal edges with arbitrary angle in different heights
    Daiki UCHIDA, Jiro IWASHIGE
    Article type: Article
    Session ID: BCT2009-6
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_21
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    In urban areas, electromagnetic waves are scattered complexly by walls and edges of buildings. Therefore, it is important to estimate the propagation path from the viewpoint that effectively uses the radio wave resources. In this paper, the electromagnetic diffracted field by two edges with arbitrary angle in different heights are analyzed by GTD.
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  • Scattering of Electromagnetic Radiation from Square Buildings whose Outer Walls Have Round Convexities
    Toshiyuki SUEYOSHI, Toshiaki MATSUNAGA, Mayumi MATSUNAGA, Tuyoshi MATS ...
    Article type: Article
    Session ID: BCT2009-7
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The effect of outer wall's shapes on electromagnetic waves propagation is presented. The fact that the rates of reflected, transmitted and scattered waves are changed depending on the radii of round convexities which are located on outer walls of a square building have been verified not only analytically but also experimentally. The both results obtained by the FVTD method and experimental testing show that the reflected and scattered waves are increased and the transmitted waves are decreased.
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  • Numerical Analysis of Electromagnetic Wave Scattering from Perfectly Conducting Objects
    Gwihwan MO, Norimasa NAKASHIMA, Kiyotaka FUJISAKI, Mitsuo TATEIBA
    Article type: Article
    Session ID: BCT2009-8
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    It is important for the design of wireless communication systems to clarify the characteristics of electromagnetic (EM) wave scattering from rain. This paper treats EM wave scattering from four perfectly conducting objects and numerically solves them by using the boundary element method. The objects have the shape of a sphere and an oblate raindrop and are on the top of a regular tetrahedron. Numerical results show that the amplitude of scattered wave is larger for raindrops than for spheres. As the distance between objects becomes longer, the amplitudes of forward and backward scattered waves vibrate. However, the center of vibration converges on a value.
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  • Distribution of electric fields strength inside the room enclosed with concrete walls in proportion of densities of people
    Kousuke FUJITA, Toshiaki MATSUNAGA, Mayumi MATSUNAGA, Tsuyoshi MATSUOK ...
    Article type: Article
    Session ID: BCT2009-9
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_33
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    The effect of densities of people on electric field strength propagating inside the room is presented. The fact that the distribution of electric fields propagating inside a room is changed depending on densities of people has been verified not only analytically but also experimentally. The results obtained by the FVTD method agree well with those obtained by experimental testing and those results show that the electric field strength propagating inside the room are decreased as densities of people inside there are increased.
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  • Estimation of Dielectric Constant of a Metal Backed Material by Using Spatial Cylindrical Standing Wave
    Tatsuya OSHINOMI, Tsuyoshi MATSUOKA, Mayumi MATSUNAGA, Toshiaki MATSUN ...
    Article type: Article
    Session ID: BCT2009-10
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_37
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    This paper considers the estimation of complex dielectric constant of metal backed material by using spatial cylindrical standing wave. A line source is located near the metal backed material and electric field strength between the source and the material is obtained by microwave experiment. The electric field strength is analyzed theoretically by changing the electric parameters of the material: dielectric constant and conductivity. The electric parameters for which the electric field strength by theoretical analysis is good agreement with that by experiment are estimated to be the electric parameters of the material. The estimated parameters are also compared with those obtained by the coaxial probe method.
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  • Analysis of Triple-Band Circularly-Polarized Microstrip Antenna
    Takafumi FUJIMOTO, Katsuhiro NAKANO, Kouhei IWANAGA
    Article type: Article
    Session ID: BCT2009-11
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_41
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    In this paper, a Triple-Band Circularly-Polarized square microstrip antenna is analyzed using the simulation software. Antenna characteristics are calculated and operational principles of the antenna are discussed using the electric current distributions. Moreover, the possibility as a triple-band circularly-polarized antenna for GPS is discussed
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  • Design of a small and low profile print antenna using Peano line operating at 1GHz
    Takashi TERADA, Kazuki IDE, Kazuki IWATA, Takeshi FUKUSAKO
    Article type: Article
    Session ID: BCT2009-12
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An electrically small and low profile print antenna using Peano line is presented. A half-wavelength linear antenna is fed at an offset position from the center for a structure having a metallic back conductor with which the feed is coupled. Furthermore, a Peano line element is used for electrically small size. In the Peano line element, current on a pair of neighboring lines with the longest length is less canceled out, because the phase of the pair of neighboring lines in the Peano element is different. Also, we have fabricate a low profile antenna with a metallic back conductor at the position of 50μm away from the element, and measured the radiation efficiency. The radiation efficiency of Peano antenna has increased by 3dB compared to that of meander antenna.
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  • Study of antenna system for GPS data gathering on radio controlled airplane
    Yudai IKEMIZU, Shigeto ARAMAKI, Takehiko TSUKIJI
    Article type: Article
    Session ID: BCT2009-13
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_49
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    In the study of an autopilot system of a radio controlled airplane, it is considered very important to provide GPS for the position data of air plane which enable one to control out-of-sight flight. In this paper, we discuss about data communication link to transmit the GPS data to ground control station. Here, we introduce the 4 elements stack array antenna consist of the modified transmission line antenna for receiving antenna of the GPS data from the air plane. This antenna system provides omni-directional radiation pattern in the horizontal plane and narrow beam pattern in the vertical plane with high gain.
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  • Dual Frequency Reader Antenna for RFID Portable Terminal
    Mitsuo TAGUCHI, Chikako NISHIYAMA, Henry I. HASIBUAN
    Article type: Article
    Session ID: BCT2009-14
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_53
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    A dual frequency circularly polarized antenna is proposed for UHF (950MHz) and microwave (2.45GHz) RFID reader applications. By properly combined circularly polarized square ring slot structure into well known circularly polarized truncated square patch antenna, a dual-frequency circularly polarized microstrip antenna is presented. The proposed antenna is located on the finite dielectric substrate. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moment is used.
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  • Numerical Analysis of Reception Antennas on Digital Terrestrial Television
    Mitsuo TAGUCHI, Hiroya ICHINOSE
    Article type: Article
    Session ID: BCT2009-15
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_57
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    As a reception antenna on the digital terrestrial television, two types of planar dipole antenna are numerically analyzed. Their return loss characteristics, current distribution and electric filed radiation pattern are numerical analyzed. By changing the shape of antenna or adding the parasitic element near dipole element, the wideband operation is realized. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moment is used.
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  • The 8th Harmonic V-Band Push-Push Oscillator using Slot Ring Resonator
    Yuki YUGE, Kengo KAWASAKI, Takayuki TANAKA, Masayoshi AIKAWA
    Article type: Article
    Session ID: BCT2009-16
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_61
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    This paper represents the eighth harmonic Push-Push oscillator. A both-sided MIC technology is adopted in the oscillator. The oscillator consists of a slot ring resonator, microstrip line, and two negative resistance circuit using HEMT. The microstrip line is used for the power combining circuits, This kind of oscillator has advantages such as easy circuit design, the simple circuit configuration and the miniaturization of the circuit size. The oscillator is expected to achieve millimeter wave oscillators at low cost.
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  • A study on Construction of remote lecture systems with high-presence using HD video (1)
    Hiroaki Kubota, Kousuke Aoki, Isao Nishihara, Shizuo Nakano, Masaki Na ...
    Article type: Article
    Session ID: BCT2009-17
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_65
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    In this research, the remote education system is constructed with high realistic presence. The remote education system is executed with HD video transmission from the museum to the room of audience. The technique of the image synthesis is estimated that it compound of the lecturer video and the teaching material video. As a result, the experiment of remote education has user-friendliness interface and high quality image composition.
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  • 50 years of my life dedicated to research of wire antennas
    Takehiko TSUKIJI
    Article type: Article
    Session ID: BCT2009-18
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_69
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    It was my first experience to manufactured a 3 elements Yagi-Uda array antenna for the ham radio when I was 20 years old. Since then I have dedicated to developed many antennas for these 50 years, which called the centerline driven loop antenna, the twin delta loop antenna, the modified transmission line antenna, the parallel transmission line loaded loop antenna with reduced size, the parallel transmission line loaded multi-band loop antenna, the double folded mono-pole antenna, and the circularly polarized normal mode helical antenna. I also reported principles of the developed antennas in many conferences or my books. In this report, I would like to introduce the historical back ground or episode with relating to these antenna developments.
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  • Analysis of Stacked Rectangular Microstrip Antenna Loading a Helical Pin -Part 5-
    Kouhei IWANAGA, Takafumi FUJIMOTO
    Article type: Article
    Session ID: BCT2009-19
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_75
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    Staked rectangular microstrip antenna with a shorting plate and helical pin is proposed as a car antenna for triple band operation in ITS. The proposed antenna operates as a conventional stacked maicrostrip antenna at the highest resonant mode. At the middle and the lowest resonant modes, the antenna radiates at low elevation angle from the helical pin and the shorting prate. In this paper, as an example of triple band antenna in the ITS, the antenna for the VICS, mobile WiMAX and ETC is designed. The proposed antenna has the proper radiation pattern for VICS, mobile WiMAX and ETC. The antenna is small in size and effective triple operation.
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  • A study of the propagation characteristics in SFN-GF service area
    Hiroki OHTA
    Article type: Article
    Session ID: BCT2009-20
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_79
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    Mobile reception of digital terrestrial television broadcasting is a reception environment different from a fixed reception, and attention in various situations of a low antenna height, a low-gain antenna, a portable reception, a mobile reception, and the indoor reception. In SFN-GF (Single Frequency Network-Gap Filler), the link budget design that considers a building right under and indoor mobile reception is needed. I studied about the results of the simulation, and the measurement of propagation characteristics in the service area of SFN-GF.
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  • A Field Experiment of Channel Equalizer for Echoes outside the Guard Interval at the Mizunami Relay Station
    Ken'ichi MURAYAMA, Kazunori YOKOHATA, Kazuhiko SHIBUYA, Noriyuki ...
    Article type: Article
    Session ID: BCT2009-21
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_83
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    We have researched and developed a channel equalizer to compensate the signal degradation caused by echoes outside the guard interval of an OFDM signal. This paper describes the result of field experiments of a prototype equalizer. In this experiment, trial equalizer was used at the Mizunami relay station in Gifu prefecture where is deterioration of an OFDM signal caused by the reflection waves from ships on the Ise Bay.
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  • A study on Construction of remote lecture system with high-presence using HD video (2)
    Isao NISHIHARA, Shizuo NAKANO, Masaki NAKASHIMA, Kousuke AOKI, Takashi ...
    Article type: Article
    Session ID: BCT2009-22
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_87
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    The recent increases in network speed allows data and moving image transmission to be realized more easily. This trend would seem to offer support for students asking lectures by top class lecturers regardless of student location; the key demand is that the lectures must offer high presence. This paper proposes a simple remote lecture system with high presense. We drew the problem which the present remote lecture has. And we propose some means to solve these problems. Then we realized the remote lecture with more high presence.
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  • BusNaviTV : Bus Location Information using Datacasting
    Takahide KUROZOE, Daisuke YAMASHITA
    Article type: Article
    Session ID: BCT2009-23
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_91
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    In Fukuoka Prefecture, a shuttle bus is very important in public transportation. We, Television Nishinippon Corporation try providing the beneficial service to the TV audience as a local broadcasting station and introducing the convenience of digital terrestrial television broadcasting by datacasting Bus Location Information.
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  • Development of low latency wireless camera and the introduction case
    Hidehiko Ikegawa
    Article type: Article
    Session ID: BCT2009-24
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_95
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    In Fuji Television, development of the wireless camera system with low latency and high quality is furthered. We developed the super-low latency HD encoder 「HD c 3000e」 which is the compact size and can be attached easily to a camera, and report the example actually introduced into sports relay programs and work of music programs. Moreover, by developing the small TS dividers which enable 2ch bulk transmission, we are advancing examination the high-quality transmission system which can be used in music programs compression coding artifact is easy to appear in reconstructed pictures and reports the outline.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_App1
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_App2
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  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: January 22, 2009
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.33.3.0_App3
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