ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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24.8
Displaying 1-16 of 16 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • On the Influence of a Signboad on a Building Wall upon the Electromagnetic Wave Propagation
    Kentaro YAMASHITA, Jiro IWASHIGE, Kenta NAKASHIMA
    Article type: Article
    Session ID: BF02000-1/ROFT2000-1
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    For mobile communication in urban area, estimation of electromagnetic wave scattering by buildings and other obstacles is important for effective arrangement planning of base station antenna. In this paper, we analyze the electromagnetic fields scattered by a conducting plate on an edge of wedge such as a signbord on a building wall by GTD and show some numerical examples.
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  • Indoor Propagation in Model House
    Kazunori UCHIDA, Dala DA, Chang-Kwon LEE, Masao UEMURA, Toshiaki MATSU ...
    Article type: Article
    Session ID: BF02000-1/ROFT2000-1
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper is concerned with an application of ray tracing method (RTM) to electromagnetic wave propagation in a model house. The main frame of the house is made of steel plates and most of the other parts, such as walls, floors and ceilings, are made of woods. Since we cannot ignore the transmitted waves through walls, floors and ceilings in this type of house, we have to develop a ray searching algorithm taking account of transmitted rays through them. In this paper we propose a simple algorithm which neglects thickness in searching rays, but we consider thickness effect in calculating fields in terms of the reflection and transmission coefficients of a three-layered lossy dielectric slab. Numerical examples are given for the field distributions in rooms, and the numerical results are compared with experimental data.
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  • Analysis of Frequency-Selective Tripole Array
    Mitsuo TAGUCHI, Masanori HAYAKAWA, Takafumi FUJIMOTO, Kazumasa TANAKA
    Article type: Article
    Session ID: BF02000-3/ROFT2000-3
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The scattering characteristics of tripole array printed on a thin dielectric film is numerically investigated by using the electromagnetic simulator AWAS. The array is composed of tripole elements with arms of equal length. The center of element is put on the vertices of equilateral triangle lattice and the each arm is located on the sides of triangle. The frequency-selective characteristics of scattered fields are numerically examined for the plane wave incidence from the vertical direction to the array.
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  • Power Divider using Microwave Planar Circuit
    Shin FU, Takayuki TANAKA, Eisuke NISHIYAMA, Masayoshi AIKAWA
    Article type: Article
    Session ID: BF02000-4/ROFT2000-4
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper presents a new approach to control electromagnetic field by the integration of microwave circuit and circuit elements. At first, the basic function of power divider is discussed, in which a microwave planar resonator is used as the microwave circuit. The high frequency power divider has practical flexibility in the design. Furthermore, the integration of short conductor and the planar resonator has realized about 4 times wide frequency band.
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  • Active Slot Antenna for Transmission
    Mitsuo TAGUCHI, Mitsuhiro MASUDA, Yoshitaka MATSUOKA, Takafumi FUJIMOT ...
    Article type: Article
    Session ID: BF02000-5/ROFT2000-5
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    CPW-fed active slot dipole antenna for transmission is numerically analyzed. Between the feed point of passive slot dipole and the CPW, the silicon transistor 2SC3604 is integrated. The actual gain of transmitting antenna is expressed in terms of the scattering parameters of amplifier circuit and the input impedance and directivity of slot dipole. The gain characteristics of amplifier circuit is calculated.
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  • On ferrite substrate a microstrip antenna for circularly polarization
    Hideki Yamamoto, Akira Imahase, Takeshi Fukusako, Nagahisa Mita
    Article type: Article
    Session ID: BF02000-6/ROFT-2000-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_27
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A microstrip patch antenna using in-plane biased YIG polycristaline substrate has been investigated experimentally. The experimental results show the possibility of the circnlarly polarized radiation under weak applied DC magnetic field which is less than 100Oe. In the experiments, the axial ratio of the polarization can be controlled within 15dB by the variable DC magnetic field.
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  • Analysis of square loop array antenna with the parallel branch wires
    Toshihiro MIZUGUCHI, Masaaki YAMASAKI, Takehiko TSUKIJI
    Article type: Article
    Session ID: BF02000-7/ROFT2000-7
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    It is well known that the parallel branch wire loading technique to an antenna is an effective method to reduce the antenna size. In this paper, in order to reduce the size of a square loop antenna, we introduce a parallel branch wire loaded square loop antenna. And it is shown that size of the parallel branch wire loaded square loop antenna is reduce to almost 60%. We also investigated two elements Yagi-Uda array antenna using the parallel branch wire loaded square loop antennas as element antennas. It is proved that the parallel branch wire loaded square loop antenna without feed point works as the reflector element and the obtained gain of the Yagi-Uda array antenna is about 6.8dB.
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  • Electromagnetic Fields Scattered by a Building with a Rooftop Conducting Plate
    Jiro IWASHIGE, Kenta NAKASHIMA, Kentaro YAMASHITA
    Article type: Article
    Session ID: BF02000-8/ROFT2000-8
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_39
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Estimation of electromagnetic wave scattering by buildings and other obstacles is very important for communication in urban area. In this paper, the electric fields of the waves, which are transmitted from one side of a building and resched at the other side over its rooftop, are calculated based on GTD. The fields diffracted by a square obstacle and a conducting plate erected on a rooftop of a building are also discussed.
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  • Rough Surface and Delay Spread
    Kazunori UCHIDA, Kwang-yeol YOON, Mitsuo TATEIBA
    Article type: Article
    Session ID: BF02000-9/ROFT2000-9
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper is concerned with the numerical analysis of electromagnetic wave scattering from a rough surface by using ray tracing method. The method is effective when the average height and correlation length of the rough surface are relatively large compared with the wavelength. First we check the accuracy of the present method in comparison with a rigorous solution to the strip diffraction problem. Second we show some examples of traced rays including reflected and diffracted ones. Finally we also show numerical examples for scattering and propagation characteristics peculiar to the rough surface problem.
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  • Study on Electromagnetic Wave Absorber with Bincho Charcoal (part2)
    Jong Hwan KIM, Hideya MATSUBARA, Takafumi FUJIMOTO, Kazumasa TANAKA, M ...
    Article type: Article
    Session ID: BF02000-10/ROFT2000-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_51
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The complex permittivity and permeability of the materials with bincho charcoal powder and silicon are measured at the frequencies from 800MHz to 4GHz. The measured data are compared with the conventional materials for the electromagnetic wave absorber. The imaginary part of permittivity is large compared with the conventional materials for absorber. The reflection losses of single-layer type absorber with 40% bincho charcoal and 6-layer type absorber with six different mixing rates are calculated by using FDTD method. More than 17dB of the incident power is absorbed within the 6-layer absorber of 30mm in thickness.
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  • Electromagnetic field Processing for planar circuits by integration of circuits and elements
    Ryotaro SUMIDA, Eisuke NISHIYAMA, Masayoshi AIKAWA
    Article type: Article
    Session ID: BF02000-11/ROBF2000-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_57
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This study aims to develop novel microwave functional circuits by the integration of microwave circuits and circuit elements such as capacitors and IC chips, etc.. where microwave electromagnetic field are controlled and microwave signals are processed for the purpose of application to smart antennas, etc.. Using the functions of combining/dividing and processing microwave signals, this approach will realize adaptive radio transmission and reception, etc..
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  • Analysis of CPW Bend by FDTD Method
    Tetsuji SHIMOGAWA, Eisuke NISHIYAMA, Masayoshi AIKAWA
    Article type: Article
    Session ID: BF02000-12/ROFT2000-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_63
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Coplanar Waveguide (CPW) Bends deteriorate transmission characteristics due to the phase difference between the two slots. The phase compensation method proposed here requires only the pattern design with no air-bridges. The phase compensated CPW Bends were calculated with transmission frequency performance by using FDTD method. The characteristics of the proposed CPW Bends were investigated.
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  • A Design Method of Beam Tilting Antenna with Reactive Loads : For the Antenna with more than 3 Loads
    Takayuki TANAKA, Masayoshi AIKAWA, Akihide SAKITANI, Shigeru EGASHIRA
    Article type: Article
    Session ID: BF02000-13/ROFT2000-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_69
    CONFERENCE PROCEEDINGS FREE ACCESS
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    For the base station antenna of cellular mobile telephone systems, a beam tilting antenna, which achieves down beam tilting of main beam with smaller cell size, is desired. Such a beam tilting is realized easily by a loaded wire antenna. In this paper, design method of the antenna with more than 3 reactive loads for realizing desired tilt angle, high directive gain and low sidelobe level is described.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: January 27, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.8.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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