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Predecessor
25.16
Displaying 1-9 of 9 articles from this issue
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Article type: Cover
Pages Cover1-
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (31K) -
Toshihiro Yamane, Shigeo Numata, Tetsuya Mizumoto, Yoshiyuki NaitoArticle type: Article
Session ID: ROFT2001-35
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWide-band electromagnetic wave absorber panel has been developed. This absorber panel has the structure of PC curtain wall and the wide-band characteristics. In order to widen the frequency range, the ferrite fin structure is adopted. In this paper, the cases of incident angle 0, 30 and 60 degree are discussed. From the experimental results, it is shown that the developed absorber has the wide-band characteristics covering VHF and UHF band. The experimental results indicate that this absorber panel is available for the all oblique incident angle. It is concluded that the developed absorber panel is applicable to overcome the television ghost problem in urban area.View full abstractDownload PDF (853K) -
Kenji Suzuki, Yuichi Itoh, Ryuichi Hirade, Osamu Mikami, Teiji UchidaArticle type: Article
Session ID: ROFT2001-36
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe purpose a 90-degree optical path conversion method using a 45-degree micro mirror pin, and studied optical coupling characteristics between a 45-degree micro mirror pin and a optical waveguide.View full abstractDownload PDF (549K) -
Hisatoshi SEMA, Minehiro IMAMURA, Yoshiyasu ITOH, Osamu MIKAMIArticle type: Article
Session ID: ROFT2001-37
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIntroduction of an optical fiber to a laser diode Doppler Velocimeter using self-mixing effect was investigated. A clear Doppler-shifted signal could be obtained by using a DFB laser emitting at 1.5μm wabelength and a polarization-maintaining optical fiber of 1.06m length. Two beam irradiation scheme using an optical coupler was also studied and this made the irradiation angle information unnecessary for the velocity component in the plane of the two beams. It was confirmed that introduction of fibers is quite useful for miniaturization of the sensor head and for two beam irradiation scheme.View full abstractDownload PDF (465K) -
Kazutoshi Inoue, Masaya Enomoto, Ken Takagi, Yoshiaki MoriyaArticle type: Article
Session ID: ROFT2001-38
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSBroadcasting satellite will use higher frequency from 12GHz to 21GHz because it is easy to get wide frequency band. Effect of rain attenuation becomes bigger as using frequency up. We searched characteristics of tipping-bucket type rain-gauge and quick-response type rain-gauge during heavy rainfall intensity. As rainfall intensity up, error ratio of tipping-bucket type rain-gauge increase also. In quick-response type rain-gauge, water current occurs if flow-rate up to some value. As flow-rate decrease, water current changes to drop at certain flow-rate but this value is smaller than that of water current occur.View full abstractDownload PDF (522K) -
Ken Takagi, Satoshi Ikeda, Eiji Shibuya, Toru Kamimura, Yoshiaki Moriy ...Article type: Article
Session ID: ROFT2001-39
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSSatellite communication system by geostationary satellite is interfered by sun noise near the equinox day every year. We observed CN ratio and noise level of broadcast satellite in spring and autumn of 2000. And we calculated theoretical CN ratio degradation value of using parabolic antenna. These calculation results agree with observed CN ratio charecteristics well. By this calculation method, expectation method of sun noise interference for any antenna and frequency is shown.View full abstractDownload PDF (455K) -
Article type: Appendix
Pages App1-
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (85K) -
Article type: Cover
Pages Cover2-
Published: February 17, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (67K)
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