ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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36.3
Displaying 1-26 of 26 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_Toc1
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  • Electric Field Distribution Considering Walls, Windows and Residents inside Apartments Having Many Rooms
    Masanori NAKANO, Toshiaki MATSUNAGA, Mayumi MATSUNAGA
    Article type: Article
    Session ID: BCT2012-1
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Indoor propagation was measured using the realistic inhabited building model. The building model was defined as one floor of an apartment constituted by concrete walls and windows, and had residents. The comparison of measurement data obtained by using the building model having closed windows and those obtained by using the building having opened windows showed that electric field distributions inside buildings became higher by being closed windows. In conclusion, reflections and loss of windows are important effects when we think indoor propagation. Measurements were carried out by using the scaled building model and compared with numerical data obtained by FVTD analyses. Measurement data were agreed very well with simulation data.
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  • Electric Field Distribution in Neighborhood of a Forest of Apartments Having Outer Walls of Various Materials
    Kouta SHIIHARA, Toshiaki MATSUNAGA, Mayumi MATSUNAGA
    Article type: Article
    Session ID: BCT2012-2
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Electric field distribution in neighborhood of a forest of apartments was measured to be understood that they will change according to materials of walls. The real forest apartments were modeled for this study and reflection waves were measured as transmitting incident waves from outside of the model. The forest apartments were constituted by six apartments and each apartment was made by concrete walls. In this paper, electric field distributions around the apartments were compared by changing the location of conductive covers outside of the concrete walls. According to these comparisons, putting conductive covers on the outside walls which are close to a next apartment is effective way to lead electromagnetic waves toward the back of the apartments. Comparisons of electric field distributions around the apartments covered by conductor plates only on the walls being close to a next apartment and those around the apartments fully covered by conductor plates showed that backwards distributions were almost same, however, scattering waves to front, left and right sides became higher in the case being covered fully. Measurement data were compared with numerical data obtained by FVTD analyses and they agreed very well.
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  • Electromagnetic Field Propagation inside and around Square Buildings Having Glass Windows
    Kazufumi INOMATA, Toshiaki MATSUNAGA, Mayumi MATSUNAGA, Kazunori UCHID ...
    Article type: Article
    Session ID: BCT2012-3
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A study about electric fields distribution around or inside buildings according to those structures is presented. Radio communications such as mobile phones and wireless LAN systems are affected by walls and windows of buildings when those communication devices are used inside or around buildings. In this paper, electric field distribution analyzed using the building model which was constituted by concrete walls and windows were compared with those analyzed using the building model which was constituted by only concrete walls. In addition, electric field distributions around the building model that some windows were opened partly were analyzed. All measurement data were compared with the numerical results obtained by FVTD simulations. In conclusion, the effect of windows on the electric field distribution was remarkably different from that of concrete walls. Reflection waves from windows were higher than those from concrete walls, and transmission waves through windows were smaller than those through concrete walls. Therefore, electric fields strength around windows became higher than those around concrete walls.
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  • Effect of Ground Plane on the Circular Polarization Characteristics on Leaky Wave Antenna using Composite Left/Right-Handed Transmission Line
    Masahiko ISHII, Takeshi FUKUSAKO
    Article type: Article
    Session ID: BCT2012-4
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Nowadays, many kinds of leaky wave antennas using composite right/left-handed transmission line have been reported. Some of them have circular polarization characteristics but tend to be complicated. Therefore circularly polarized leaky wave antenna which has no phase shifter and still has basic comb-shaped unit cell is proposed. In this paper, considering the effect of ground plane, the authors try to generate circular polarization.
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  • Reduction of Mutual Coupling Between Two Inverted-F Antennas by Using Two Slits on Ground Plane
    Yasuhiro HARADA, Takeshi FUKUSAKO
    Article type: Article
    Session ID: BCT2012-5
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A simple structure for achieving low mutual coupling between two inverted-F antennas is presented. Mutual coupling between the antennas can be reduced by using two slits on the ground plane. A space between antennas can be close as λ/8 because the slit structure does not require height and only 6-mm slit width. This is good for cellular phone which needs small and low profile structure. As a result, a mutual coupling of -35 dB is achieved in the measurement.
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  • Printed rectangular monopole antenna for circular polarization
    Takafumi FUJIMOTO, Kozo Jono
    Article type: Article
    Session ID: BCT2012-6
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_21
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    Authors propose a printed rectangular monopole antenna for circular polarization. By simulations, the relationships of antenna geometrical parameters and antenna characteristics (the return losses and the axial ratio of circularly polarized wave) are clarified. Moreover, the calculated return loss and axial ratio are compared with measured results. The good agreement between the calculations and measurements confirm the results of this work. In the bandwidth (the return loss ≦-10dB with axial ration ≦3dB), the calculated and measured results are approximately 53% and 60%, respectively. The proposed antenna has similar radiation pattern at the frequency band with axial ratio ≦3dB.
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  • Animation of Electromagnetic Wave Radiation from Wire Antenna Part 2
    Mitsuo TAGUCHI, Hiroshi GOTO
    Article type: Article
    Session ID: BCT2012-7
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_25
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    When the Gaussian monocycle pulse is excited at the center of dipole antenna, the time domain response of electromagnetic field distribution is calculated by using the electromagnetic simulator. The length of dipole antenna is a half wavelength and a wavelength at the center frequency of monocycle pulse. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moment is used.
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  • On Reduction of Computation Time of Discrete Ray Tracing Method
    Yuki Kimura, Junichi Honda, Masafumi Takematsu, Kazunori Uchida
    Article type: Article
    Session ID: BCT2012-8
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper is concerned with a reduction of computation time of Discrete Ray Tracing Method (DRTM) which is a numerical method for analyzing electromagnetic fields above random rough surfaces (RRSs). In the DRTM, we discretize RRSs as well as ray searching. In order to reduce computation time for ray searching, we modify the conventional algorithm discretizing RRSs with equal intervals to a new one which discretizes them with unequal intervals according to their profile. In addition, we introduce an approximation of Fresnel function 'which enables us to reduce field computation time. We discuss the reduction of computation time of DRTM from the numerical view points of ray searching and field computation.
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  • On Estimation of Amplitude Modification and Propagation Order of 1-ray and 2-rays Models
    Kazunori Uchida, Junichi Honda, Keisuke Shigetomi, Jun-Hyuck Lee
    Article type: Article
    Session ID: BCT2012-9
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_33
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    This paper is concerned with an estimation of amplitude modification (α) and distance order of propagation (β) which are included in 1-ray and 2-rays models to deal with the electric field distribution in complicated propagation environments. First we introduce 1-ray and 2-rays model, and we also consider two modification factors (α, β). Next, we determine the two parameters α and β by comparing with Hata's equations which are widely used for field prediction in urban, suburban and rural areas. Finally, we discuss the estimated two parameters α and β obtained by numerical computations.
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  • On a Numerical Algorithm for Optimized Allocation of Base Station Based on PSO Method
    Jun-Hyuck Lee, Junichi Honda, Kazunori Uchida
    Article type: Article
    Session ID: BCT2012-10
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper is concerned with a numerical algorithm for optimized allocation of base station based on a particle swarm optimization (PSO) method. We first discuss 1-ray and 2-rays propagation models, and we introduce amplitude modification factor (α) and distance order of propagation (β) to simulate electromagnetic wave propagations in complicated propagation environments. Next, we introduce a communication distance function to estimate communication distance of radio waves, and we propose a PSO algorithm for finding the optimized allocation of base stations (BSs). Finally, we show numerical examples of the inhomogeneous triangular cells by using an artificial communication distance function with some peaks.
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  • Experimental examinations in characteristics of antenna from behaviors and microwave to submillimeter wave frequencies of electromagnetic field of lossy dielectric substance neighborhood
    Toshiaki MATSUNAGA
    Article type: Article
    Session ID: BCT2012-11
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_41
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Research results about antennas and propagation are talked in the presentation. First, experimental studies of electric fields distributions inside and around buildings where constructions of buildings are made by concrete, which are considered lossy dielectric substances as well as electrically random media. Second, design and measurement techniques for microwave/submillimeter wave antennas which are utilized for RFID and radio astronomical observation apparatuses are explained, are shown.
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  • Diffracted Fields Going on a Building Rooftop : Diffracted Fields Considering Reflection by Ground and Building Rooftop
    Katuki HAYASHI, Jiro IWASHIGE, Ryo NAGAO, Yuki ISAYAMA
    Article type: Article
    Session ID: BCT2012-12
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_49
    CONFERENCE PROCEEDINGS FREE ACCESS
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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 of an effective utilization of the radio wave resources. In this paper, the electromagnetic fields diffracted by edges of a building rooftop are analyzed, and reflected waves by ground and building rooftop are considered.
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  • Diffracted Fields Considering Wedge Angle and Material
    Yuki ISAYAMA, Jiro IWASHIGE, Ryo NAGAO, Katsuki HAYASHI
    Article type: Article
    Session ID: BCT2012-13
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_53
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Recently, many wireless communication devices such as mobile phones are used. However, in urban area waves are scattered by buildings and other structures, so the propagation path is complicated. In this paper, we discuss the diffracted fields how they are affected by shapes and material of the wedges.
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  • Diffracted Fields by Two Horizontal Edges of Different Heights with Arbitrary Angle
    Ryo NAGAO, Jiro IWASHIGE, Yuki ISAYAMA, Katuki HAYASHI
    Article type: Article
    Session ID: BCT2012-14
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_57
    CONFERENCE PROCEEDINGS FREE ACCESS
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    To predict the wave propagation paths in the urban area, it is important from the viewpoint of effective utilization of radio resources. Fields scattered by walls and edges of buildings and other structures affect radio propagation. In this paper. we consider electromagnetic waves diffracted by two horizontal edges of different heights with arbitrary angles.
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  • Stacked Rectangular Microstrip Antenna for Triple Band (GPS/VICS/ETC) Operation in ITS
    Daisuke TANAKA, Takafumi FUJIMOTO
    Article type: Article
    Session ID: BCT2012-15
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_61
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    Authors have proposed an L-probe fed stacked rectangular microstrip antenna combined with a ring antenna for triple-band operation in ITS. In this paper, the relationships between geometrical parameters of the antenna and antenna characteristics (VSWR, axial ratio and bandwidth) at three frequency bands are clarified by simulation. Moreover, antenna for GPS/VICS/ETC is designed.
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  • UHF Band RFID Reader Antenna Composed of Ultra Low Profile Inverted L Antenna for Portable Terminal
    Mitsuo TAGUCHI, Tatsuya NAKAYAMA
    Article type: Article
    Session ID: BCT2012-16
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_65
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    The circular polarized antenna composed of an unbalanced fed ultra low profile inverted L antenna and a parasitic inverted L element is proposed for the reader antenna of the portable terminal of UHF band RFID. When the size of rectangular conducting plane is 228.5 mm by 275.5 mm, and the antenna height is 14 mm, the return loss less than -10 dB is obtained at the frequencies from 902 MHz to 930 MHz. The axial ratio less than 3 dB is satisfied from 915 MHz to 922 MHz. In the numerical analysis, the electromagnetic simulator "WIPL-D" based on method of moment is used.
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  • Unbalanced Fed Inverted L Antenna Composed of a Microstrip Line on a Finite Dielectric Substrate
    Shuichi HAMADA, Mitsuo TAGUCHI
    Article type: Article
    Session ID: BCT2012-17
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_69
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, the unbalanced fed inverted L antenna composed of a microstrip line (MSL) on a finite dielectric substrate is proposed for the antenna of PC card. This antenna is numerically analyzed. The MSL is located close to the edge of dielectric substrate. Therefore, the line width is changed so that its characteristic impedance because 50Ω. The input impedance of the antenna adjustied by changing the length of line and theridth of ground conductor plate. In the numerical analysis, the electromagnetic simulator WIP L-D based on the Method of Moment is used.
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  • Beam steering antenna using oscillator array
    Takafumi YANAGA, Kengo KAWASAKI, Eisuke NISHIYAMA, Masayoshi AIKAWA
    Article type: Article
    Session ID: BCT2012-18
    Published: January 19, 2012
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.36.3.0_73
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    In this paper, the beam steering antenna using oscillator array is proposed. The proposed beam steering antenna consists of a antenna array, a Push-Push oscillator array and coupling circuits. The array elements are connected to outputs of the Push-Push oscillator array. By adjusting a condition of the coupling circuit, the phase difference of the outputs of the Push-push oscillator array can be controlled. Therefore, the beam steering function is achieved. The Fundamental characteristics of the proposed antenna are investigated theoretically and experimentally.
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  • A study on arrival angle estimating array antenna
    Hirotoshi SAKAI, Eisuke NISHIYAMA, Masayoshi Aikawa
    Article type: Article
    Session ID: BCT2012-19
    Published: January 19, 2012
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.11485/itetr.36.3.0_77
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    In this paper, a novel array antenna for DOA estimation system is proposed. The proposed array antenna consists of patch elements and a both-sided feed line circuit including a magic-T. In the DOA estimation system, a arrival angle is obtained by a sum signal and a differential signal. By using the magic-T in the proposed array antenna, the sum and differential signals can be obtained easily with the simple structure. The characteristics of the proposed antenna are investigated experimentally.
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  • Mutually Synchronized Push-Push Oscillator Array using Variable Phase Shift Coupling Circuit
    Tatsuma UEHARA, Takayuki TANAKA, Masayoshi AIKAWA
    Article type: Article
    Session ID: BCT2012-20
    Published: January 19, 2012
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.11485/itetr.36.3.0_81
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    In this paper, a Push-Push oscillator array using Variable Phase Shift Coupling Circuit (VSPCC) is presented. The oscillator array consists of reflection-type push-push oscillator and VSPCC. The VSPCC consists of a CPW resonator and varactor diodes. The phase difference between the output signals of the oscillators is a controlled by the bias voltage of the varactor diodes in the coupling circuit. The basic performance of the oscillator array using two push-push oscillators is confirmed experimentally.
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  • A Push-Push Oscillator Array Using Sequential Injection-locking Coupling Circuit
    Kengo KAWASAKI, Takayuki TANAKA, Masayoshi AIKAWA
    Article type: Article
    Session ID: BCT2012-21
    Published: January 19, 2012
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.11485/itetr.36.3.0_85
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    In this paper, an oscillator array using a sequential injection-locking coupling circuit is proposed. Push-Push oscillators are used for the unit oscillator. The sequential injection-locking coupling circuit consists of a buffer amplifier and a phase shifter. The signal of a push-push oscillator is injected to the adjoining oscillator via the coupling circuit. The phase difference between the output signals of the Push-Push oscillators is controlled by the phase shifter in the coupling circuit. The basic performance of the oscillator array using two Push-Push oscillators is investigated. The Push-Push oscillator array is designed in Ku-band. The phase shift between the Push-Push oscillators has attained 214 degrees at 16.4 GHz.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: January 19, 2012
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.11485/itetr.36.3.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: January 19, 2012
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.11485/itetr.36.3.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: January 19, 2012
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.11485/itetr.36.3.0_App3
    CONFERENCE PROCEEDINGS FREE ACCESS
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