ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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39.4
Displaying 1-29 of 29 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_Toc1
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  • Numerical Analysis Using the Wiener-Hopf Method of Plasmon Resonance Absorption by Noble Metals and a Half Infinite Plate
    Kazuki FUKUOKA, Kichi KANTAKE, Akira MATSUSHIMA
    Article type: Article
    Session ID: BCT2015-1
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Scattering and absorption property of electromagnetic waves by a very thin semi-infinite plate of noble-metal is obtained by numerical analysis using generalized boundary conditions. To investigate directly the behavior of electromagnetic waves at the endpoints when light waves is incident on this plate, we solve semi-infinite problem using the Wiener-Hopf method.
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  • Operation analysis of Circular Polarized Antenna Composed of Unbalanced Fed Ultra Low Profile Inverted L Antenna for RFID terminal
    Mitsuo TAGUCHI, Takanobu TANIGUCHI
    Article type: Article
    Session ID: BCT2015-2
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    For a reader antenna of RFID mobile terminal, the circular polarized antenna composed of an unbalanced fed ultra low profile inverted L antenna and a L-shaped slot on a rectangular conducting plane is investigated. S_<11> less than -10dB and the axial ratio less than 3 dB are satisfied at the frequencies from 854.5 MHz to 1052.1 MHz. The current distribution on the antenna and the electric field distribution on the slot is studied and the mechanism of generation of circular polarization is discussed. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moments is used.
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  • A Low-profile Surface Wave Antenna Using Dogbone Structure for Unidirectional Beam
    Yuki OGATA, Takeshi FUKUSAKO
    Article type: Article
    Session ID: BCT2015-3
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_9
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    we propose an antenna that surrounded the Dogbone structure that a kind of metamaterial with elements to get beam of the unidirectional. In radiation pattern, proposed antenna achieved FB ratio of 17dB and 14dB at simuration result and measurement result. Furthermore, the proposed antenna has a vertical polarization, and is a low profile structure.
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  • Compact High Gain Planar Antenna Composed of Unbalanced Fed Ultra Low Profile Inverted L Antenna
    Mitsuo TAGUCHI, Yusuke SASAKI
    Article type: Article
    Session ID: BCT2015-4
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_13
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    The compact high gain planar antenna excited by the ultra low profile inverted L antenna is analyzed numerically and experimentally. The unbalanced fed inverted L antenna is mounted on the rectangular conducting plane. Two parasitic conducting planes are located above the inverted L antenna. The design frequency is from 2.40 GHz to 2.45 GHz. When the antenna size is 61 mm by 63 mm by 12 mm, S_<11> less than -10dB is satisfied at the frequencies from 2.20 GHz to 2.55 GHz. The directivity becomes more than 8 dBi at this frequency band. In the numerical analysis, the electromagnetic simulator "WIPL-D" based on the Method of Moments is used.
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  • Conversion Efficiency Improvement of Differential Rectenna Using Shorted-Stub Matching Circuit
    Jun Takahashi, Eisuke Nishiyama, Ichihiko Toyoda
    Article type: Article
    Session ID: BCT2015-5
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_17
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    In this paper, conversion efficiency improvement of the differential rectenna is presented. We have examined the antenna element interval, antenna input impedance and characteristic impedance of transmission lines to obtain higher conversion efficiency. Adjusting the antenna impedance and characteristic impedance corresponds to the impedance matching between the antenna and rectifying diode. However, the reactive part of the diode impedance cannot be considered. Hence, the conversion efficiency improvement using shorted-stub matching circuits is examined to consider the reactive part of the diode impedance, and higher conversion efficiency is expected.
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  • A study on a simple measurement of dielectric constant by using reflected wave in time domain
    Yasuhiro SHIGETAKE, Tsuyoshi MATSUOKA, Masato OGATA
    Article type: Article
    Session ID: BCT2015-6
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_21
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    This paper considers a simple method for estimation of the dielectric constant of planar material in the time domain. The method estimates the time delay between the reflected waves from the front and back surfaces of the material located near the antenna in the chamber box. The time delay is used to estimate the dielectric constant. This method is applied for several materials and the results are compared with those obtained by the coaxial probe method. The comparison shows that the method can be used for rough estimation of the dielectric constant.
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  • On a Development and Usage of a Coil Incorporated in an AM Radio Broadcasting Rectenna
    Takahiro YOSHII, Shingo OTSUKA, Norimasa NAKASHIMA
    Article type: Article
    Session ID: BCT2015-7
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_25
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    Developing a high performance rectenna is an important issue in the technology of electromagnetic energy harvesting. One may utilize a coil in an external antenna of an AM radio broadcasting rectenna. However, the coil may operate as a multiturn loop antenna or a helical antenna, depending on how to connect it to the next circuit. The authors, in this paper, make coils with various sizes and measure the electromagnetic characteristics in the AM radio broadcasting frequency band. The measurement using a LCR meter reveals that the author's coils behave as an ideal ones in the frequencies from 500 [kHz] to 1 [MHz]. As a result of the measurement utilized by a vector network analyzer, it is not confirmed that the differences of the electromagnetic characteristics caused by the connection of the author's coil. Based on the above results, the authors compare the output voltages of rectenna whose external antenna is a multiturn loop antenna or a helical antenna.
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  • Performance Evaluation of a Current Aggregation Type Multi-Polarization Rectenna Using Equivalent Circuit : Input RF Power and Circuit Topology
    Ryuichi NAKASHIMA, Eisuke NISHIYAMA, Ichihiko TOYODA
    Article type: Article
    Session ID: BCT2015-8
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_29
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    In this paper, the polarization angle characteristic of the current aggregation type multi-polarization rectenna is examined using an equivalent circuit from a viewpoint of input RF power and circuit topology. It is clarified that the polarization angle characteristic of the current aggregation type multi-polarization rectenna strongly depends on the input RF power. Furthermore, the advantage of the parallel connection over the series connection is also confirmed when the differential rectennas of different input power are connected.
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  • Circularly polarized small microstrip antenna for wireless sensor network
    Asuka HAMAMATSU, Takafumi FUJIMOTO, Tomoyuki FUJISHIMA, Yoichi ISHIZUK ...
    Article type: Article
    Session ID: BCT2015-9
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_33
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    A dual band circularly polarized MSA using the MSA with one pair of crank-shaped slit at each edge is proposed for wireless sensor network. The antenna is fed by an L-probe feed. The proposed antenna satisfies the specification of the bandwidths of 3dB-axial ratio with -10dB-|S11| (2.401GHz-2.481GHz). Moreover, the antenna has the radiation characteristic with wide beam width.
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  • On a Distribution of Electromagnetic Field Strength in the Neighborhood of a Transmitting Antenna for AM Radio Broadcasting
    Akira SHODAI, Naruto MATSUDA, Shingo OTSUKA, Norimasa NAKASHIMA
    Article type: Article
    Session ID: BCT2015-10
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_37
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    The authors work on a development of electromagnetic energy harvesting in the neighborhood of a transmitting antenna for an AM radio broadcasting. The locations of rectennas are one of an important issue for efficient operation of this technology. This paper treats received power of electromagnetic wave from RKB radio broadcasting in theoretical and experimental aspects. The observation points are in the vicinity of the RKB radio station placed in Wajiro tidal flat. The theoretical estimation takes one of two approaches: Friis transmission equation or superposition of direct and reflected waves based on geometric optics. The experimental evaluation is carried out by using a handheld spectrum analyzer. Although the theoretical evaluation based on the geometric optics is good agreement with the experimental one, the difference in the 60 [dBm] is confirmed at this stage. Since the influences of surrounding obstacles may be little on the tidal flat, experimental evaluation reveals that the received power is distributed in a concentric circle as pointed out in the theoretical one.
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  • Experimental Evaluation of a Mono-Pulse DOA Estimation Antenna Integrated with RF Amplifiers
    Ryo TANAKA, Eisuke NISHIYAMA, Ichihiko TOYODA
    Article type: Article
    Session ID: BCT2015-11
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_41
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    We have proposed a novel direction-of-arrival (DOA) estimation antenna based on the mono-pulse system. The DOA estimation antenna is constructed with microstrip antennas and Magic-T circuits which generate E and A signals from RF signals received by two antennas As the Both-sided MIC technology is used for the feed circuit, the proposed antenna has a good performance with simple structure. In this paper, a DOA estimation antenna connecting amplifiers is proposed and experimentally evaluated. The sensitivity was improved by adding RF amplifiers.
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  • Two-dimensional Positioning for Radio Terminal in 4 by 4 MIMO System Using Leaky Coaxial Cable Antenna
    Shuhei OKI, YAFEI Hou, Takeshi HIGASHINO, Minoru OKADA
    Article type: Article
    Session ID: BCT2015-12
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_45
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    This article proposes a positioning method for radio terminals by using Leaky Coaxial Cable(LCX) antenna. A Longitudinal position detection method in 2 by 2 LCX-MIMO system using signal TDoA has already proposed. This article expands this system in 4 by 4 LCX-MIMO system and explains how to detect a radial position in 4 by 4 system. In addition, MUSIC algorithm is introduced in the proposal method to estimate position accurately. As a result of performance evaluation by the computer, it is found that the proposed method has high accuracy compared with the conventional method.
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  • Wideband printed inverted-F antenna for MIMO system
    Junpei Taguri, Takafumi Fujimoto
    Article type: Article
    Session ID: BCT2015-13
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_49
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A wideband printed inverted-F antenna is proposed. Although the frequency bandwidth of conventional inverted-F antenna is approximately 10%, the proposed inverted-F antenna is wider than 100% by loading rectangular element to the feeding element perpendicularly. In this paper, moreover, 2-elements MIMO system using the proposed printed inverted-F antenna is investigated. The isolation between two antenna elements is less than -20dB by loading a linear slit and a T-shaped slit in the ground. Correlation coefficient between two antennas of inverted-MIMO systems is less than 0.02.
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  • Development of Triple Band MIMO Antenna
    Mitsuo TAGUCHI, Toshiki TSUTSUMI
    Article type: Article
    Session ID: BCT2015-14
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_53
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    The triple band MIMO antenna composed of unbalanced fed ultra low profile inverted L antennas is proposed and memorically analyzed. A parasite wires are located above each inverted L antenna. At the three frequency bands of 2.4 GHz to 2.497GHz, 5.15GHz to 5.35GHz, and 5.47GHz to 5.725GHz, S11 less than -10 dB is satisfied. The correlation coefficient at each frequency band is less than 0.005.
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  • Numerical Algorithms for Solving Wave-Related Problems : from Wiener-Hopf Technique to Dijkstra Algorithm
    Kazunori UCHIDA
    Article type: Article
    Session ID: BCT2015-15
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_57
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    This technical report describes several analytical and numerical methods that the author has used in the past 40 years to deal with electromagnetic (EM) scattering and propagation. First, he deals with the Wiener-Hopf (WH) technique which is very useful for solving semi-infinite boundary value problems. Second, he discusses that the WH technique is equivalent to the filtering operation in spectral domain and the spectral domain method combined with the sampling theorem can be successfully applied to EM propagation in tunnels and EM diffraction from planar gratings. Third, FVTD (Finite Volume Time Domain) and DRTM (Discrete Ray Tracing Method) are introduced and they have been applied to EM propagation in closed space, backscattering from RRS (Random Rough Surface) and propagation along it. Statistical methods such as RRS generation and PSO (Particle Swarm Optimization) are also discussed. Finally, applications of Dijkstra algorithm to wave propagation are described from a view point of Fermat's principle.
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  • Prototype Evaluation of a Design Method Using Tunable Shorted Stubs for Multiband RF Circuits
    Jun HIRATA, Takayuki TANAKA, Ichihiko TOYODA
    Article type: Article
    Session ID: BCT2015-16
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_65
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    In this paper, a new design method for multiband RF circuits which can switch their frequency bands is proposed. The simulated and measured results of the prototype circuit are also discussed. The proposed circuit employs two tunable shorted stubs attached at the input and output terminals of the RF circuit. The operating frequency bands of the RF circuit can be switched by changing the stub length. As the shorted stub acts as a reactive element, the normalized input/output impedances of the active device must be converted to the normalized conductance of G=1 by pre-matching networks. First, the pre-matching circuit design of a dual-band amplifier is explained in detail as an example, and a practical configuration of the tunable shorted stub using a PIN diode switch is also proposed. Finally, a prototype circuit which switches its operation bands between 0.8 and 2.0 GHz is demonstrated to verify the proposed design method.
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  • Fundamental Study on Ultra-wideband Antenna Excited by ULPIL Antenna
    Mitsuo TAGUCHI, Koya TAKATA
    Article type: Article
    Session ID: BCT2015-17
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_69
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    The unbalanced fed planar inverted L antenna on a rectangular conducting plane is proposed and numerically analyzed. This antenna is excited between the band and its end. The width of planar element becomes narrower from the feed point to the antenna end. When the antenna size is 710mm by 56mm by 49mm, S11 less than -10dB is satisfied from 168MHz to 259MHz. In the numerical analysis, the electromagnetic simulator "WIPL-D" based on Method of Moments is used.
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  • Numerical Analysis of Electromagnetic Scattering from Three-Dimensional Array of Dielectric Nanospheres
    Hiroki KOMORI, Masato TANAKA, Mizuki KAMAI, Akira MATSUSHIMA
    Article type: Article
    Session ID: BCT2015-18
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_73
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    Much attention has been attracted for solar power generation. For reduction of the generation cost, amorphous silicon solar battery without the worry of the lack of materials attracts attention unlike a conventional crystal type. Recently, electromagnetic scattering from arrays composed of periodic dielectric bodies have attracted more and more attention because they are important as highly efficient for solar panels. We analyzed the three dimensional problem numerically by an application of the modal expansion method. In conclusion, we calculated total scattering cross section and absorption cross section for confirming the reinforcement of the electric field derived from surface plasmon resonance and lattice resonances.
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  • Numerical Analysis Using the Method of Moments of the Plasmon Resonance Absorption by the Noble Metal Disks
    Daiki SAKOMURA, Xiaowei JI, Akira MATSUSHIMA
    Article type: Article
    Session ID: BCT2015-19
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_77
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    The characteristics of scattering and absorption of electromagnetic waves by a two-dimensional grating of thin noble metal disks are obtained by numerical analysis. A set of integral equations for the unknown surface current density on the disks are derived by generalized boundary conditions and solved numerically using the method of moments. We apply the transverse magnetic field of the circular waveguide modes as the basis function. The reflected, transmitted, and absorbed powers are computed for several grating parameters.
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  • A study of the receiving system in tunnel by using IP radio
    Kazuaki WAKAI, Masaki IDE, Kanta SAMEJIMA
    Article type: Article
    Session ID: BCT2015-20
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_81
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    This system is focused on that difference in transmission time and IP radio and public radio (medium wave and FM radio said that). You receive recording the public radio received a delay time of IP radio forward in time. In, broadcasting sounds entered the tunnel at the same time switching from IP radio public radio sound system. Leaving the tunnel and at the same time also reverting IP radio broadcast, continuing to listen. Processing according to the transit time of the tunnel in the points system. Consider the tunnel in the receiving system using IP radio.
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  • Analysis of Power Transmission Coefficient of Solar Sell Device with Periodic Groove Structure
    Masaji TOMITA, Koki Waranabe, Kazunori UCHIDA
    Article type: Article
    Session ID: BCT2015-21
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_85
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    In this paper, the mode-matching method in the sense of least squares was applied to analyze the transmitted solar power coefficient through semi-conductor slab of the solar cell with rectangular groove or sinusoidal periodic groove structure. From analyses, it was shown that forming that structure on the surface of semi-conductor slab increases transmitted power.
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  • An Evaluation of Aircraft Positioning by Terrestrial Digital Broadcasting
    Junichi Honda, Takuya Otsuyama
    Article type: Article
    Session ID: BCT2015-22
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_89
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    Recently, a new aircraft surveillance system based on the passive positioning has been attracted as a conventional primary surveillance radar alternative and expanding coverage area. The system can use not only the conventional radar signals but also other signals. This paper describes a new surveillance method by using the terrestrial digital broadcasting.
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  • Development of Compact 8K Super Hi-Vision camera and 8K shootings
    Hiroshi SHIMAMOTO, Toshio YASUE, Takashi ISHIDA, Tomoharu IWAMOTO
    Article type: Article
    Session ID: BCT2015-23
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_93
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    We have developed a 33-Mpixel, 120-fps and 12-bit ADC single-chip color CMOS image sensor and a compact 8K camera head equipped with this image sensor. The camera head has dimensions of 125mm(W)×125mm(H)×150mm(D) and weighs only 2 kg. In addition, as the image sensor has a 25mm image circle, the camera head is compatible with various Super 35 PL lenses for digital cinema. We have shot various kinds of footages such as Kohaku-utagassen song festival and 2014 FIFA World cup with this camera.
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  • Full-specification 8K Super Hi-Vision reference camera
    Kazuya KITAMURA, Takuji SOENO, Toshio YASUE, Toshihisa WATABE, Shoji K ...
    Article type: Article
    Session ID: BCT2015-24
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_97
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    The full-specification 8K Super Hi-Vision reference camera with 7,680 (H) × 4,320 (V) resolution (8K resolution), 120-Hz frame frequency with progressive scanning, 12-bit tone reproduction, and a wide color gamut has been developed. Measurement results show 4,320 TV lines of modulation responses and improvement in temporal resolution with the 120-Hz frame frequency as compared with the 60-Hz frame frequency. The average and maximum values of the color difference (AE) between ideal and measured 24-patch color checker charts were 1.0 and 2.9.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_App1
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_App2
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  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: January 22, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.4.0_App3
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