ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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21.56
Displaying 1-20 of 20 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • An Improvement of Input Properties in a Slot-Coupled Microstrip Antenna with a Parasitic Strip
    Kohichi OZAKI, Manabu YAMAMOTO, Kiyohiko ITOH
    Article type: Article
    Pages 1-6
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In a slot coupled microstrip antenna with a triplate line feed, the parallel plate mode can be successfully suppressed when the antenna is operated at the series resonant frequency of the radiating patch. However, the antenna has low input resistance in this case. In this report, we perform analytical considerations on the input properties of the antenna to achieve high input resistance at the series resonant frequency. Numerical results indicate that input resistance is decreased because of the inductive effect due to the slot. Then we propose the use of a parasitic strip to cancel the inductive effect and confirm the increase of the resistance.
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  • Considerations on a Circular Microstrip Patch Antenna with Slits Suppressing Re-radiation of Higher Harmonics
    Yuusuke YAMADA, SYAHRIAL, Manabu OMIYA, Kiyohiko ITOH
    Article type: Article
    Pages 7-14
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A circular microstrip patch antenna (CMSA) is mainly used in the microwave power transmission system. This type of antenna suppresses re-radiation at higher harmonic frequencies. It is verified with measurements that the CMSA combined with slits suppresses higher harmonics generated in the rectifier more effectively than the conventional CMSA. In this paper we treat the CMSA with slits, in which slits are located along surface current streams related to the dominant TM_<110> mode in order to suppress higher harmonics without disturbing a resonance of the dominant mode. First we show a design method of the slits. Second we give the optimum slit design by numerically and experimentally evaluating input characteristics of the CMSA with slits. Finally, we compare the designed slits with the other type of ones.
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  • A magnetic probe with multilayer structure for high spatial resolution
    Naoya TAMAKI, Norio MASUDA, Masahiro YAMAGUCHI
    Article type: Article
    Pages 15-20
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_15
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper describes a shielded loop probe with multilayer structure for high spatial resolution to measure magnetic fields near a trace on surface of printed circuit boards(PCBs). The probe is fabricated with four layer PCBs. According to replacing a coaxial cable of the conventional probe by a strip line, it can acquire smaller loop size and shorter distance between the probe and the trace in comparison with the conventional probe. The spatial resolution is evaluated by measuring magnetic field distribution above the trace. It is indicated that the probe has over twice spatial resolution than the conventional probe.
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  • HF-UHF Band Electromagnetic Measurements Using Multi-Layer Printed Wiring Board
    S. Yabukami, M. Yamaguchi, K.I. Arai
    Article type: Article
    Pages 21-26
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have developed new microstrip line type pick up coil and shielded loop type coil, which are planar type pickup coil using by multi layer printed wiring board technique. Magnetic thin film permeability can be measured from 1MHz-3.5GHz range to take into account of electric field and impedance matching. We developed electromagnetic noise mapping system using by shielded loop type coil array. High resolution (0.1mm) and vector detection can be realized.
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  • The relationship between harmonic current of digital ICs and load impedance
    Satoshi Kazama, Shinichi Shinohara, Risaburo Sato
    Article type: Article
    Pages 27-32
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_27
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Output current of digital ICs cause electromagnetic radiation. Therefore, it is important to grasp the output characteristic of the digital IC. By our previous investigation, it is shown that the measurement method using 2-port load is useful for output characteristic measurement of digital ICs. We ascertained that the harmonic current from digital ICs could estimate by linear relation among internal impedance, internal voltage source and load impedance. However, the output current which is different from the estimation value is measured on the condition that load impedance of CMOS is low. It is shown that the nonlinear characteristic of digital ICs causes this phenomenon.
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  • Transient Analysis of Frequency Dependent Signal Transmission Lines by Scattering Matrix Method
    Satoshi ICHIKAWA, Hirokazu MIYAKE
    Article type: Article
    Pages 33-40
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A method for the transient analysis of frequency dependent signal transmission lines terminated linear or nonlinear lumped elements is presented. The frequnsy dependent portion of the system is analysed as multi-port circuit to obtain the scattering matrix by Laplace transformation. Step response of the scattering matrix is calculated numerically by inverse Laplace transformation. The convolution integral equation and nonlinear equation govering the overall system are discretized an solved numerically in the time domain in order to obtain transient responses.
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  • Transmission Loss of a Shielded Cable with Co-Based Amorphous Ribbon
    Mayumi YANAGIYA, Toshinori MORI
    Article type: Article
    Pages 41-46
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_41
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Ferrite cores are used to filter common-mode noise and attenuate emission from a cable. However, it needs large space near a connector to attach them to a cable. And they dose not suit a large-scale system such as a telecommunication switching system because it uses quite a number of cables. We applied a Co-based amorphous ribbon to a shielded cable to prevent an increase in component volume. The cable loaded with Co-based amorphous ribbon exhibits high transmission loss (11dB/3m at 300MHz) as well as emission attenuation, because the lossy impedance added to the cable cores due to the ribbon is high. However, when an aluminium foil is inserted between the amorphous ribbon and the cable cores, the impedance is lower and the transmission loss decreases to that of a normal shielded cable(Al foil shielded cable). This is because that the Al foil attenuates magnetic wave. Thus this method is effective for balancing noise reduction performance and signal integrity.
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  • Radio Absorptive Properties of γ-Fe_2O_3 and T_iO_2 Composite Materials (Part5)
    Masaru Chino, Yoshio Nikawa, Takashi Yamamoto, Ario Yamamoto
    Article type: Article
    Pages 47-54
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_47
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Radio absorptive properties in (γ-Fe_2O_3/T_iO_2)=(80/20) weight ratio are measured at the frequency range from 40MHz to 6.5GHz band. By our discussion, it has been found that matching condition is closely related to ε_γ'≒μ_τ', ε_γ"≒μ_τ", tanδ_ε≒tanδ_μ(≒1〜4) at 4.5GHz band. In this case, the bandwidth is depending on the thickness of the absorptive materials. The detail data of the absorptive properties is shown in this report.
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  • Sutdy on Radio Absorptive Material using graphitized Carbon
    Fumio Sakamoto, Yoshio Nikawa, Masaru Chino
    Article type: Article
    Pages 55-60
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_55
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Radio absorptive materials in microwave and millimeter wave frequencies, which can be used for the hazardous EM radiation circumstances, have been studied. For the measuring frequencies from 40 MHz to 40 GHz, the materials dispersed graphitized carbon in silicone rubber are discussed. For the single layer radio absorptive materials, it is found that good absorptive characteristics can be obtained as long as narrow frequency band. Also, for the two layer radio absorptive materials, it is found that absorptive bandwidth can be obtained wider than that obtained for single layer radio absorptive materials.
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  • Development of Phantoms as a Human Model at Microwave Frequency
    Lira HAMADA, Rong WANG, Yoshinobu OKANO, Kazuyuki SAITO, Keiichi MATSU ...
    Article type: Article
    Pages 61-66
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_61
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A lot of phantoms have been proposed as the human model for experimental evaluation of the effect between the human body and electromagnetic fields around. In this report, phantoms in two types are introduced as the human model realizing the same permittivity as biological tissue. First, the solid phantom for a model of human is described. Next, the characteristics of the liquid phantom composed of water and silicone emulsion have been introduced.
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  • An evaluation of snowfall rate estimated from meteorological radar data : In the case of the observation at Syowa Station, Antarctica
    Masahiko HATANAKA, Hiroshi TAKEYA, Shinya KIMURA, Yutaka YOSHIDA, Akir ...
    Article type: Article
    Pages 67-73
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_67
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Using the echo data of vertical pointing meteorological radar and the snow particle size distribution observed by video camera on the ground at Syowa Station, Antarctica, the snowfall rate at each altitude was evaluated. To verify the evaluated snowfall rate, we obtained the snowfall rate at the ground using the snow particle VCR tape : we carefully measured the size of snow particle on the video image ard took count of the snow particle images in the VCR tape. Making a comparison between the snowfall rate at the altitude of 200m from the radar data and the rate on the ground from the VCR tape, we found the maximum difference between them is about two times. We believe that this difference is acceptable in te field of microwave remote sensing.
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  • Characteristic of Carrier-to-Noise Ratio of Broadcasting-Satellite Reception at Sun Interference
    Satoshi IKEDA, Yoshiaki MORIYA, Panrawee, PUTTANNAKOOL, Chatree, B ...
    Article type: Article
    Pages 75-81
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_75
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Broadcasting satellite (BS) reception is evaluated by carrier-to-noise ratio (C/N). The reception signals of broadcasting satellites are influenced by various noise from the surroundings. Especially, the sun noise has a big influence. This paper describes that we measured the sun noise interference with C/N meter measurement. In Japan, we observed this phenomenon generated in the BS receiving signals (11.843 [GHz]) of NHK twice a year. When the sun, the satellite and the reception antenna queue up straight, this phenomenon is generated. As a result, the noise interference reduces C/N values more than 4dB. Our measurement result showed that sun noise interference was larger than other interference source.
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  • Characteristics of clipping occurrence duration in optical cable TV systems
    T. Kurakake, Y. Ito, N. Nakamura
    Article type: Article
    Pages 83-88
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_83
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An optical SCM cable TV involves the serious drawback of clipping-induced impulsive distortion, which spreads over the wide frequency range and may degrade the BER performance of digital channels. We found that the frequency accuracy of the analog sub-carriers is one of the main factors that characterize the clipping-induced impulsive distortion infecting the digital channel performances. This factor has not been considered in previous approaches.
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  • Experimental Investigation of Reflective Influence for Optical Transmission System
    Tomoyuki KATO, Hideyuki OMURA, Shin-ichi TAKASHIMA, Yoshiyuki KAMATA, ...
    Article type: Article
    Pages 89-96
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_89
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Optical transmission systems based on optical fibers are attractive as high-speed and large-capacity transmission methods. It is necessary for designing such optical transmission systems to consider the influence of optical reflections induced in transmission paths. We experimentally investigated the transmission characteristics of a optical transmission system (RIN, CTB, CSO, XM) under the influence of optical reflection. In order to satisfy the specifications for optical CATV systems, direct reflection signals into LD should be suppressed below -40dB and multiple reflection signals into PD should be suppressed below -50dB. The use of optical isolators is effective to suppress the reflection into the LD. The increase of distortion (CTB, CSO, XM) can be suppressed as the delay times is increasing.
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  • A Module Design Technique for Optical Subscriber System Using Electromagnetic Field Analysis
    Hideaki Kimura
    Article type: Article
    Pages 97-103
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_97
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Now, we have developed the computer experimental system [CES] for reducing the total system design cost. In this paper, we proposed the high-accurate and high-efficient PCB/MCM design simulator by combining the electromagnetic field analysis [FD-TD technique] with the commercial circuit simulator [HSPICE] as a part of CES, which can consider both IC characteristics and the rounding noise throughout the module substrate easily. Furthermore, we applied the proposed simulator to design the ONU module with high-sensitivity and examined its numerical validity by comparing the experimental results. This simulator will be very effective as the general design tool with EMC characteristics.
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  • Evaluation of Applicability for Semi-anechoic Chamber as Test Site above 1GHz
    Yoshinobu HAYASHI, Takashi SHINOZUKA, Yasuo HASHIMOTO, Risaburo SATO
    Article type: Article
    Pages 105-108
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_105
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Requirements of test site for EMI measurement above 1GHz are now under consideration. Only free-space condition comes to an agreement. The users of semi-anechoic chambers currently used below 1GHz take a notice to an applicability to use them above 1GHz. We measured the characteristics of a semi-anechoic chamber, and then investigated the requirements to realize a free-space condition by covering the electromagnetic absorbers on the floor. It was found that when interference measurement is performed for a frequency range from 1 to 3GHz and a distance between transmitting and receiving antennas of 3m, while electromagnetic absorbers for widths greater than the first Fresnel zone are installed on the floor of the current semi-anechoic chamber, free-space conditions are satisfied within a precision level of 2dB for horizontal polarized waves and 2.5dB for vertical polarized waves.
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  • Biological Effects of High Stationary Magnetic Fields
    Akiko Nakata, Naoya Suzuki, Tetsuo Ikeda, Hidetoshi Kobayashi, Takeo I ...
    Article type: Article
    Pages 109-114
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_109
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We investigated the heartbeat of mudfishes laying under stationary magnetic field for several hours in comparison with that of the control. The results show that the heartbeat of influenced mudfishes decreased to about 4/5. The variation of heartbeat is independent from the strength of the magnetic field and the exposed time. As a result the time that the influence of the magnetic field on the heartbeat remains is proportioned to the strength of the magnetic field and the exposed time. Such influence dosn't appear for weak magnetic field or short exposed time.
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  • [title in Japanese]
    Article type: Appendix
    Pages 115-
    Published: September 26, 1997
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.21.56.0_115
    CONFERENCE PROCEEDINGS FREE ACCESS
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