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Predecessor
22.6
Displaying 1-13 of 13 articles from this issue
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Article type: Cover
Pages Cover1-
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (16K) -
Article type: Index
Pages Toc1-
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (50K) -
Masashi Tsukamoto, Mitsuo TAGUCHI, Hideyuki TAHARA, Takafumi FUJIMOTO, ...Article type: Article
Pages 1-6
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe computer program NEC2 for the analysis of wire antennas, developed by G.J.Burke et al., is investigated. In this program, the electric field integral equation (EFIE) is solved with the current expansion functions of three term sinusoidal functions. The feed point current, the root mean square error of current and the error of electric field on the solid cylindrical dipole antennas with length of 0.1 to 0.35 wavelength are compared with the reference data calculated by EFIE with the current expansion functions satisfying the edge conditions at the antenna ends.View full abstractDownload PDF (424K) -
Yutaka AOKI, Akihide SAKITANIArticle type: Article
Pages 7-10
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt is important for accurate positioning in GPS that the antenna set sultable point at the posltioning point. In this paper, we discuss a way to obtain the phase center of antenna accurately and present the relation between error of phase center and observation point.View full abstractDownload PDF (377K) -
Hiroko SHIGENAGA, Masayoshi AIKAWAArticle type: Article
Pages 11-14
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe FDTD is useful method for solving various elctromagnetic problems. This method is based on the discretization of the Maxwell's equation with respect to small rectangular grid cells. In this paper, the size of analytical area is considered. The field distributions, impedance and radiation patterns of a short dipole antenna are calculated for FDTD region space and PML layer size. The effect of the cell size space on the calculated caracteristics of the antenna are investigated.View full abstractDownload PDF (406K) -
Takayoshi NAKAMIZO, Takehiko TSUKIJIArticle type: Article
Pages 15-19
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, the antenna system with dielectric loaded square loop array antenna with reflector is analyzed using the method of finite difference time-domain (FDTD). This paper presents analytical results of the chang of gain for distance between dielectric and reflector.View full abstractDownload PDF (440K) -
Tomohiro KURIHARA, Takehiko TUKIJIArticle type: Article
Pages 21-24
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn order to provide an antenna for a mobile communication, we have developed a new type of the transmission line type antenna, which we call a modified transmission line antenna (MTLA). We try to develop a diversity antennas by using two MTLAs put in free space side by side. In this paper, we explain characteristics of MTLA first, and then consider correlation coefficients comparing MTLA with dipole antenna.View full abstractDownload PDF (378K) -
Hidemasa SUMI, Takehiko TSUKIJIArticle type: Article
Pages 25-29
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn order to narrow a band width, and make good use of frequency, we study on a variable bit rate system using satellite communications. In this paper, we explain the paitings mode and the lecture mode on video conferences. we estimated and investigated them to search for the most suitable bit rate.View full abstractDownload PDF (460K) -
Toyoko SUEMATSU, Kouji HACHIYA, Akihide SAKITANIArticle type: Article
Pages 31-34
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have studied the simplified DGPS using two GPS receivers, and obtained from 1 to 10m accuracy of point positioning. In case of using the simplified DGPS in many surrounding obstacles, e.g. in city area, it occurs that sufficient positioning accuracy couldn't be obtained because of multipath and restriction of satellites location. In this paper, we investigate and discuss the influence of satellites location in GPS positioning by experiment and simulation. In conclusion, it is cleared that GPS positioning error are closely related with satellites location.View full abstractDownload PDF (459K) -
Kwang-yeol Yoon, Kazunori UchidaArticle type: Article
Pages 35-40
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper is concerned with a finite volume time domain (FVTD) analysis of the electromagnetic wave (EM) scattering from a periodic roughsurface such as a building wall in connection with the ray tracing method (RTM). In the RTM analysis, we take account only of the conventional optical reflection which responds to the zero-th Bragg reflection. In this context the field estimation by the RTM analysis may exibit a poor accuracy when we cannot neglect the higher order Bragg recflections. In this paper, we investigate what conditions are needed in order to be able to ignore the higher order Bragg reflections for the RTM.View full abstractDownload PDF (763K) -
Chang-Kwon LEE, Toshiaki MATSUNAGA, Kazunori UCHIDAArticle type: Article
Pages 41-46
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper is concerned with the electromagnetic (EM) field evaluation for arbitrary shaped tunnels. In the analysis we use the finite volume time domain (FVTD) method together with the ray tracing method (RTM), and we compare the numerical results obtained by these two methods. We treat some examples of arbitrary shaped tunnels. but the analysis is limited only to a two-dimensional case mainly because of the computer memory. Even the present simplified model, however, may provide us essential ideas for the analysis based on the RTM ; for example, how to divide a curved tunnel wall into flat tunnel walls, its accuracy and so on.View full abstractDownload PDF (612K) -
Daisuke YAGYU, Kazumasa TANAKA, Takafumi FUJIMOTO, Mitsuo TAGUCHIArticle type: Article
Pages 47-52
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe circular microstrip antenna inserted in the center of rotationally symmetrical conductor is numerically analyzed. The electromagnetic fields within the antenna cavity are expressed by the cavity model and their expansion coefficients are determined by the electric and magnetic field integral equations on the antenna surface. The calculated input impedance is compared with the measured result. This antenna have wider beam width in E-plane and wider band width as compared with the circular microstrip antenna.View full abstractDownload PDF (535K) -
Article type: Appendix
Pages App1-
Published: January 29, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (80K)
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