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34.3
Displaying 1-28 of 28 articles from this issue
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Article type: Cover
Pages Cover1-
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (13K) -
Article type: Index
Pages Toc1-
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (78K) -
Shuzo YOSHIMURA, Eisuke NISHIYAMA, Masayoshi AIKAWAArticle type: Article
Session ID: BCT2010-1
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, microstrip antennas for linear polarization discrimination function are proposed. These proposed antennas have a dual linear polarization receiving capability. In order to discriminate polarization, diodes are loaded on a microstrip antenna element directly. As the proposed array antenna is constructed using the both-side MIC technology, the structure is very compact. The basic characteristics of the proposed antennas are investigated experimentally.View full abstractDownload PDF (1077K) -
Hayato NISHIMURA, Eisuke NISHIYAMA, Masayoshi AIKAWAArticle type: Article
Session ID: BCT2010-2
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, a microstrip antenna for RF sensor is proposed. This proposed antenna is the FM-CW radar device using orthogonal linear polarizations. The proposed sensor antenna is composed of the antenna elements and a slot ring mixer. The antenna elements can be shared for transmitting and receiving wave. In the slot ring mixer, the transmitting wave and the receiving wave are multiplied and a beat frequency output is obtained. As the proposed sensor antenna is contracted using Both-side microwave technology and the mixer is arranged in the same plate, the structure is very simple and compact. The characteristics of the sensor antenna are investigated.View full abstractDownload PDF (579K) -
Mitsuo TAGUCHI, Tsubasa ARAKIArticle type: Article
Session ID: BCT2010-3
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe ultra low profile inverted L antenna on parallel wires is proposed for the element antenna of the SSR or ADS-B base station antenna for the air traffic control. On the central element of three parallel wires of length 0.49 wavelength, the unbalanced fed inverted L antenna is mounted. When the length of parallel wires are 0.49 wavelength, the distance between them is 0.124 wavelength, and the antenna height is 0.032 wavelength at the center frequency 1.06GHz, the return loss bandwidth of 6.13% and the directivity of 3.99dBi are obtained numerically.View full abstractDownload PDF (659K) -
Mitsuo TAGUCHI, Tomokazu ITOArticle type: Article
Session ID: BCT2010-4
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn order to investigate the understanding method of the phenomenon of electromagnetic wave by using the electromagnetic wave simulator, the electromagnetic wave distribution along the parallel lines is calculated. In the numerical analysis. the electromagnetic simulator Fidelity based on the FDTD method is used. The time domain response of electromagnetic field distributions are shown.View full abstractDownload PDF (1955K) -
Kazuki IDE, Satoshi IJIGUCHI, Takeshi FUKUSAKOArticle type: Article
Session ID: BCT2010-5
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAn electrically small and low profile linear antenna with a meander line using a Capacitive feed (C-feed) structure is presented. The meander line, which is the radiating element, is electromagnetically coupled with a metallic feed plate placed in between the meander line and a back metal (ground). In this structure, the imaginary part of the input impedance can be easily controlled to zero at the resonance frequency even if connected to larger grounds such as SMA connectors. In addition, the leakage current on the outer surface of the coaxial cable is sufficiently suppressed. Also, the realized gain of stacked flip horizontal meander antenna has increased by around 7dBi by compared to C-feed antenna.View full abstractDownload PDF (559K) -
Shuhei NAKAO, Ronald JOSEPH, Takeshi FUKUSAKOArticle type: Article
Session ID: BCT2010-6
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA circularly polarized broadband antenna with an L-shaped feed probe is presented. An L-shaped slot and a rectangular slot have been installed in this structure to enhance the 3-dB bandwidth in axial ratio. Also, a triangular slot have been installed at the edge of the slot to enhance the broadband characteristics in input impedance. This structure shows -10dB S_<11> characteristics of 65% and an -3dB axial ratio of 75%. The radiation patterns at different frequencies also show a good agreement between simulation and measurement as in S_<11> and axial ratio characteristics.View full abstractDownload PDF (500K) -
Mitsuo TAGUCHI, Tetsuro YOSHIDAArticle type: Article
Session ID: BCT2010-7
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSUltra Low Profile Inverted L Antenna on side wall of the cylindrical conductor for 2.45GHz band wireless LAN is numerically analyzed. When the radius of cylindrical conductor is 30mm and the antenna height is 4mm (about one thirtieth wavelength), the return loss bandwidth of 3.47% and the directivity of 3.96dBi are obtained. In the numerical analysis, the electromagnetic simulator WIPL-D based on the method of moment is used.View full abstractDownload PDF (652K) -
Yudai IKEMIZU, Shigeto ARAMAKIArticle type: Article
Session ID: BCT2010-8
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSNow, we study for autonomous Unmanned Aerial Vehicle (UAV). In this study, it is necessary to keep watching the position of UAV by using computer system above ground at all time. But we must build communication systems which get extensive positioning data of UAV. So, we designed "antenna for detecting position of data" to realize these systems. This report is showed that we could design the Modified Transmission Line Antenna (MTLA) by introducing the concept for the high levels of gain on monadelphous antenna, and it arrayed these MTLA in a vertical direction.View full abstractDownload PDF (583K) -
Shingo YOKOTA, Toshiaki MATSUNAGA, Mayumi MATSUNAGA, Tsuyoshi MATSUOKAArticle type: Article
Session ID: BCT2010-9
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe distribution of the electric field propagating inside the space on a rough topography consisting of random media has been analyzed not only numerically but also experimentally. The results obtained by this study have shown that the electric field strengths were more attenuated inside the space on the topography with a rough surface than those inside the pace on the topography with a flat surface. The results obtained by the FVTD method agree with those obtained by experimental measurements by using the scale model of topography with a rough surface. This study has been conducting for development of RF techniques which have been used lately even in the inappropriate place for radio waves such as urban area with many buildings and a mountains region with a large variety of surface features.View full abstractDownload PDF (639K) -
Kousuke FUJITA, Toshiaki MATSUNAGA, Mayumi MATSUNAGAArticle type: Article
Session ID: BCT2010-10
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe effectiveness of densities of people to electromagnetic waves propagating inside passages has been studying. In this paper, the electromagnetic waves propagating inside cross shaped passages extending from a circular hall has been analyzed experimentally and numerically, as considering effectiveness of densities of people inside those passages. The results obtained by the FVTD method and experimental measurements have shown that distribution of electric fields inside the passages has changed more complicated accompanying the increase of the density of people.View full abstractDownload PDF (807K) -
Taro TAMAKI, Kazunori UCHIDA, Junichi HONDAArticle type: Article
Session ID: BCT2010-11
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper is concerned with an approximation for the outdoor propagation characteristics by using the three parameters, amplitude factor α and order β as well as distance correction γ. To numerically determine these parameters, we compare the approximation with the Hata's empirical equations introduced for mobile communications in urban areas. Numerical computations are carried out for the received power of a mobile station moving randomly among several inhomogeneous cells. Numerical simulations are also performed for the handover of the mobile stations which are moving around among several different types of cells, for example, urban, suburban or rural areas.View full abstractDownload PDF (570K) -
Shunsuke Nakashima, Junichi Honda, Yuki Kimura, Taro Tamaki, Kazunori ...Article type: Article
Session ID: BCT2010-12
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper deals with the propagation characteristics of electromagnetic waves traveling along inhomogeneous random rough surfaces (RRSs) by using the discrete ray tracing method (DRTM). The inhomogeneous RRSs consist of several homogeneous RRSs, and they are numerically generated by the convolution method. Some numerical examples are shown for the electric field distributions along the inhomogeneous RRSs based on the DRTM. We examine numerically how the scattering from the inhomogeneous RRSs influence on the receiving powers at the observation points along this type of RRSs.View full abstractDownload PDF (632K) -
Kouta SHIIHARA, Toshiaki MATSUNAGA, Mayumi MATSUNAGAArticle type: Article
Session ID: BCT2010-13
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe electromagnetic waves propagating around buildings have been analyzed numerically and experimentally. The results obtained by this study show that the electromagnetic waves propagating around buildings change depending on what a structure of a building is considered. In this study, electromagnetic waves propagating around three adjacent buildings which are considered as three structures; (1) square pillars, (2) hollow square pillars and (3) hollow square pillars with iron bars, have been analyzed numerically and experimentally. Both results obtained by the FVTD method and experimental measurements agree well. Transmitted waves to the back of buildings considered as hollow square pillars are larger than those considered as square pillars. That is to say, electromagnetic waves propagating inside the buildings considered as square pillars are more attenuated than those propagating inside the buildings considered as hollow square pillars.View full abstractDownload PDF (603K) -
Takahiro KANEKIYO, Tsuyoshi MATSUOKA, Toshiaki MATSUNAGA, Mayumi MATSU ...Article type: Article
Session ID: BCT2010-14
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe are conducting an experimental study for the estimation of effective dielectric constant of a 2D discrete random medium. At the first stage of the study, it has been shown that the cylindrical standing waves can be used to estimate the dielectric constant of planar dielectric material. This paper is concerned with the measurement of electric field distribution around a dielectric cylinder when a line source is located near the cylinder. The experimental results are compared with those obtained by theoretical analysis to estimate the dielectric constant of the cylinder. The estimation is necessary to evaluate the effective dielectric constant of a medium, in which dielectric cylinders are randomly distributed.View full abstractDownload PDF (570K) -
Takafumi FUJIMOTO, Yujin TAGAWAArticle type: Article
Session ID: BCT2010-15
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAuthors have proposed a Triple-Band Circularly-Polarized square microstrip antenna with 2 pairs slits and have clarified operational principles of the antenna. In the antenna, the three frequency ranges which can be tuned are narrow. In this paper, the three frequency ranges are widen by changing the shape of the 2 pairs slits. By simulations, the relationships between the parameters of the slits and the three operational frequencies are clarified. Moreover, antenna for GPS (L1, L2 and L5 bands) is designed.View full abstractDownload PDF (433K) -
Takafumi Fujimoto, Sho TanakaArticle type: Article
Session ID: BCT2010-16
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSNon-diffraction beams can be obtained using a very small-width annular aperture that is placed in the back focal plane of a lens. However, since a rate of shielding of the annular aperture is very large, most incident waves are intercepted by the annular aperture. Therefore, the energy efficiency is very low. In this paper. the corn lens with a notch that generates a doughnut beam is loaded in front of the annular aperture to improve the energy efficiency. By numerical calculations, the relationships between the propagetion distance, the intensity of the non-diffraction beam and the rate of shielding of annuar aperture are examined.View full abstractDownload PDF (445K) -
Takao KUKI, Hirokazu KAMODA, Jun TSUMOCHI, Toru IWASAKIArticle type: Article
Session ID: BCT2010-17
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMillimeter-wave imaging has important applications in detecting objects concealed by optically opaque media. A prototype active millimeter-wave (60-GHz band)imaging system researched in NHK Science & Technology Research Laboratories is outlined. The performance of the system when imaging a human mannequin at short range is demonstrated experimentally. The effect on the image when various opaque obstacles such as fog, curtain, and thin plywood are positioned between the imaging system and the mannequin is also shown. Furthermore, research on a 60-GHz band electrically steerable reflectarray antenna for improving the frame rate of the system is introduced.View full abstractDownload PDF (1348K) -
Pan HU, Mitsuo TAGUCHIArticle type: Article
Session ID: BCT2010-18
Published: January 28, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAn ultra low profile inverted L antenna is numerically analyzed for the receiver antenna of a keyless entry system of the car. In order to miniaturize the antenna size, the horizontal element is bent to the meander shape. The return loss and the radiation characteristics are calculated. For numerically analyzes. the electromagnetic simulator WIPL-D is used. As a result, the size of the inverted L antenna becomes about one sixth.View full abstractDownload PDF (773K) -
Hossain Md. AZAD, Eisuke NISHIYAMA, Masayoshi AIKAWAArticle type: Article
Session ID: BCT2010-19
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, a vertical horizontal linear polarization switching controllable microstrip patch antenna is proposed. In order to realize the switching function, four switching diodes are loaded on the middles of the edges of the square patch. FDTD method is used for the simulation of the antenna. The basic behavior of the antenna is investigated experimentally For the proposed antenna structure, the linear polarization switching control of the antenna is successfully achieved experimentally and theoretically.View full abstractDownload PDF (573K) -
Shuhei Mizoguti, Takayuki TANAKA, Masayosi AIKAWAArticle type: Article
Session ID: BCT2010-20
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, a wide band positive feedback Push-Push VCO using Double-Sided MIC technology was proposed. HEMT is used in this Push-Push oscillator. Odd harmonics are suppressed and the second harmonic is the desired output. Frequency tuning has been achieved by building phase shifters into the positive feedback loops. As a result of the experiment, tuning frequency of about 1.2GHz was successfully confirmed in Ku-band.View full abstractDownload PDF (878K) -
Tsuyoshi MATSUOKA, Mayumi MATSUNAGA, Toshiaki MATSUNAGAArticle type: Article
Session ID: BCT2010-21
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSThis paper is concerned with an numerical calculation of 2D-electromagnetic wave scatterings by a dielectric material by using a CIP method combined with the quadratic interpolation. A line source which produces a sinusoidal wave is used and electric field distributions around the dielectric material are calculated. The numerical results by the proposed method are compared with those obtained by using Type-M CIP and Type-C CIP methods in terms of the accuracy, used memory size and computation time. The comparisons shows the effectiveness of the proposed method for analysing the multi-dimensional wave scattering problem.View full abstractDownload PDF (557K) -
Shintaro YOSHIMATSU, Masayoshi AIKAWAArticle type: Article
Session ID: BCT2010-22
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, an orthogonal polarization switchable array antenna is proposed. This array antenna is very simple structure using the Both-sided MIC technology effectively. The orthogonal linear polarization is easily controlled by the RF switching circuit that is implemented in the array antenna.View full abstractDownload PDF (1628K) -
A K-band Transmitter Module Integrating Push-Push Oscillator, PSK Modulator and Planar Array AntennaHiroshi OTANI, Takayuki TANAKA, Masayoshi AIKAWAArticle type: Article
Session ID: BCT2010-23
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, a K-band transmitter module integrating a Push-Push oscillator, a PSK modulator and slot-ring array antenna is presented. The module is very simple structure, because above mentioned three components can be all arranged on a same substrate.View full abstractDownload PDF (1443K) -
Article type: Appendix
Pages App1-
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (86K) -
Article type: Appendix
Pages App2-
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (86K) -
Article type: Appendix
Pages App3-
Published: January 28, 2010
Released on J-STAGE: March 30, 2018
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (86K)
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