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Article type: Cover
Pages
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Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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Article type: Index
Pages
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Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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C.K. Lee, S. Shinohara, T. Matsunaga, K. Uchida
Article type: Article
Pages
1-4
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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This paper is concerned with a finite volumn time domain (FVTD) method for electromagnetic wave propagation in H-Type two dimensional tunnels. This method is based on the volume integrations of the Maxwell's equations with respect to a small rectangular solid cell. The electromagnetic fields in the rectangular solid cell are expressed in terms of the tangential electromagnetic fields on its surfaces, which are interpolated by the former fields of the adjacent two cells. It is possible to solved the boundary value probrem of arbitary shape which contains an inhomogeneous medium. It is found that numerical and experimental results are in good agreement regarding the electric field intensities in the tunnel.
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Shinichi INOUE, Takehiko TSUKIJI
Article type: Article
Pages
5-9
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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In 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 modlfied transmission line antenna (MTLA). We try to develop a diversity antenna by using two MTLAs separated by ground plane. In this paper, we explain the antennas coupling between two MTLAs is enough for the diversity antennas. Precise data of this antennas coupling are given by means of the wire-grid method analysis and the results are also confirmed by experiments.
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Masaru EGUCHI, Kousuke TATARA, Eisuke NISHIYAMA, Shigeru EGASHIRA
Article type: Article
Pages
11-14
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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A gain of a single microstrip antenna increases by stacking a parasitic element at a distance of 0.5 λ above the feed element. Further, a stacked microstrip array antenna has a high gain and high efficiency. In this paper, to make clear how the gain increases, we experimentally discuss direcitivities of two element microstrip antenna array with paracitic elements on the relation between element distance and mutual coupling.
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Toyoko SUEMATSU, Takuya NOGUCHI, Akihide SAKITANI
Article type: Article
Pages
15-18
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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We have studied the simplified DGPS using two GPS receivers, and obtained from 1 to 10m accuracy of a point positioning. Applying the simplified DGPS to mobile positioning, it occurs that sufficient positioning accuracy couldn't be obtained because of the effect of surrounding obstacles. In this paper, we investigate and discuss few problems in the mobile positioning with simplified DGPS in city area. A strong relation between the changes of combination of satellites used for the positioning and its accuracy is comfirmed experimentally.
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Hideki MIYATA, Akihide SAKITANI
Article type: Article
Pages
19-22
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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The Differential GPS is well known as the effective system for positioning acquisition. We have studied about a simplified Differential GPS using two GPS receivers. In this paper, we apply pattem matching method to the dispersion data pattem and discuss the positioning accuracy. It is cleared that about 50cm positioning accuracy is obtained by after processing of dispersion data pattem. Presented method is not a real-time positioning, but available for high accurate positioning with GPS receiver which are on the market and easy to obtain.
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Shigefumi TOU, Takehiko TSUKIJI, Masaoki OKUBO
Article type: Article
Pages
23-28
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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The resonant antenna is a kind of backfire antenna composed of plane reflector and wire antennas. In this paper, the resonant antenna composed of finite plane reflector and two twin-delta loop elements is analyzed using the method of moment and wire grid model. This paper presents analytical results of the gain characteristics and the comparison with the case of infinite reflector. The agreement between the theoretical and experimental results in inpedance characteristics is confirmed.
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Masaaki YAMASAKI, Takehiko TSUKIJI
Article type: Article
Pages
29-34
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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In this paper, the triangular loop antenna loaded by a short-circuited coaxial stub is analyzed. The moment method has been used to calculate the input impedance and resonant frequency. Practical design parameters to optimize the antenna size and the dual frequency property of the loaded loop antenna are presented.
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Kenichi MAEZONO, Tatsuro NAKASIMA, Hiroyuki NAKAYAMA
Article type: Article
Pages
35-40
Published: January 30, 1997
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In this paper the transformer coupling coefficient I is discussed. The transformer for the high frequency use is considered as a distoributed circuit. Therefore the transforner equivalent circuit is composed of a ideal transformer, a leakage inductance and two starage capacitance (see Fig. 2). The transformer coupling coefficient K is linked with the leakage inductance and indicate the transformer's loss efficiency of the transmitting power. The K's value depends on the transformer coastraction. The K's values are presented from the theoritical and testing point of view.
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Katsumi Takasugi, Koichi Ishikawa
Article type: Article
Pages
41-45
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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A new stick-type reception antenna for medium-wave radio broadcast is developed. The antenna is durable, inexpensive and user-friendly, and is particularly suitable for reception in rural areas and inside building where the signal is not strong enough with a conventional ferrite-core antenna.
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Kazuhiro Shinozaki, Takayuki Ota
Article type: Article
Pages
47-52
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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Last Summer, TNC had removed to Momochi district beside the Fukuoka Tower. We took this opportunity to develop new type system for OA-data processing. This system consists of one Server PC (Personal Computer) and two Client PC, namely, Client/Server system. In spite of this simplicity, many functions are offered us. It can make OA-data from broadcast diagram data by QWS and transmit these data to APC etc., automatically. We report the OA-Data Processing System named "CSV" in TNC Master Control Room.
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Hisashi Tagawa, Takao Goto, Yasuo Otsubo
Article type: Article
Pages
53-55
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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Article type: Appendix
Pages
App1-
Published: January 30, 1997
Released on J-STAGE: June 23, 2017
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