EMCJ99-130 (2000-03)
A
Clock Pulse Shaper Using Piezoelectric Transformer
Takahiko Mitani, Shuichi Nitta,
Mutoh Atsuo
Tokyo University of
Aguriculture and Technology
2-24-16 Naka-cho,
Koganei, Tokyo 184-8588 JAPAN
TEL +81-42-388-7096
FAX +81-42-388-7204 FAX E-mail mutoh@tama.or.jp
Abstract:
This study proposes the Hybrid Filter using the resonance phenomena of Piezoelectric
Transformer to shape the distortion of clock pulse, verifies its performance
and establishes the design methods of Hybrid Filter. The proposed Hybrid filter
is the band-pass filter utilizing Piezoelectric Transformer and operational amplifier.
Key words: Filter, clock
pulse, wave shaper
EMCJ99-131
(2000-03)
The Characteristic of an Electromagnetic Ally
Coupled Dipole Antenna for Electromagnetic Field Sensors
Hiroyoshi
Suga and Takashi Iwasaki
Department of Electronic Engineering
The University of Electro-Communications
l -5- 1 Chofugaoka,Chofu.Tokyo, 182-8585,Japan
phone : 0424-83-2161 ext. 3344
E-mail : suga@snow.ee.uec.ac.jp
Abstract:
In this paper, an electromagnetically coupled printed dipole antenna for
measuring electromagnetic fields is designed using the FDTD method. The
calculated results compare with experimental results .
It is presented that the half-wavelength
resonance can be realized by an offset feed. It is also pointed out that the
offset feed printed dipole antenna is useful for electromagnetic field sensors.
Key words: Electromagnetically coupled printed dipole
antenna, FDTD method, Offset feed
EMCJ99-132
(2000-03)
Estimation of the
Current Distribution on a Half Wavelength Dipole Antenna from Near-Electric
Field
Kunio
GOSHO and Takashi IWASAKI
Department of Electronic Engineering,
The University of Electro-Communications
1-5- 1 Chofugaoka,Chofu ,Tokyo, 182-8585 , Japan
phone : 0424-43-5189 E-mail :
gosho@snow.ee.uec.ac.jp
Abstract :
In this paper, the current distribution of a half-wavelength dipole antenna is
estimated from the electric fields near the antenna by the conjugate gradient
method. When the distance between the half-wavelength dipole antenna and an
electric probe is 3 to 5cm, the estimated currents obtained from measured
electric fields agree with the theoretical results.
Key words:
Antenna Current Distribution, Near Electric Field, Conjugate Gradient Method, TRL
Ca1ibration
EMCJ99-133
(2000-03)
Measuring the Electro Magnetic Shielding
Effectiveness of Materials using the Metal Spray Coating Technique
Takeshi
Morita, Shozo sumihiro, and Katsuo okumura
Shibaura Institute of Technology
3-9-14 Shibaura Minato-ku. Tokyo, 108-8548.
Japan
Phone : 03-5476-2464, Fax : 03-5476-3068 E-mail : okumura@sic.shibaura-it.ac.jp
Abstract:
There has been an increasing interest in effect for electronic equipment and
human health by electromagnetic fields radiated from the electronic facilities.
In order to understand shielding effect of materials using the metal spray
coating technique, measurements have been performed using shielded Enclosure.
Main results are shown as below ;
(1)
In case of paper sprayed coating with metal, the attenuation was almost shown
the measurement limit.
(2)
It is thought that adhesion of metal and the material influenced strongly
characteristics of shielding effectiveness.
(3)
It is possible to apply to construction materials from the improvement of
fireproof of the material using the metal spray coating technique.
Key words: Electromagnetic
wave, Electromagnetic shielding effectiveness, The metal spray coating,
Shielded enclosure
EMCJ99-134
(2000-03)
Modeling of LSls to
Simulate Common-Mode Radiation
Hideki
SASAKI, Takashi HARADA, and Toshihide KURIYAMA
EMC Engineering
Center, Device Analysis Technology Laboratories, NEC Corporation
l- l, Miyazaki 4-Chome, Miyamae-ku, Kawasaki,
Kanagawa
TEL: 044-856-207 1 E -mail: hsasaki@dret.cl.nec.co.jp
Abstract:
This paper presents the LSI model to simulate common-mode radiation of printed
circuit boards (PCBs) using the FDTD (Finite Difference Time Domain) simulator.
Assuming that common-mode radiation is caused because LSIs excite the PCB
ground plane, the LSI model have been built, in which the chip and the lead
frames of a LSI are modeled respectively by a voltage source and metal wires.
To investigate the validity of this model, the measurements of emissions from
4-layer PCBs mounted with a LSI are preformed. The results show that the model,
in which the voltage source is placed parallel to the PCB ground plane, can be
used to estimate common-mode radiation properties of PCBs. The model can be
applied to simulate common-mode radiation of attached-cable PCBs, either. Since
it can be used to predict common-mode radiation characteristics of PCBs, using
this LSI model would realize the design of LSI packages and PCBs suppressing
such radiation.
Key words: common-mode radiation. FDTD, EM simulator,
LSI, printed circuit board
EMCJ99-135
(2000-03)
A Proposal of
Evaluation Method of Ingress Noise for CATV Upstream
Goh
Miyamoto1, Atsuhiro Naka2, and Aiichiro Tsuzukul
1Communications Research Laboratory, M.P.T.
2The University of Electro-Communications
4-2-1 Nukui-kita, Koganei-shi, Tokyo 1 84-8795,
Japan
Tel. +81~2-327-6312 Fax. +81-42-327-6674 E-mail : miyamoto@crl.go.jp
Abstract:
Internet services using CATV lines are getting into stride. But ingress noise
degrades upstream transmission quality, so it is necessary to cope with the
noise. Though ingress noise is measured using spectrum analyzer generally, this
method can't measure impulse noise exactly. We have proposed a new measurement
method of ingress noise using amplitude probability distribution. The proposed
method avoids the problem mentioned above and has the ability to estimate BER
directly.
Key words: CATV, ingress noise, amplitude
probability distribution, BER
EMCJ99-136
(2000-03)
Degaussing Method for
the Structural Materials in the Building
Noboru
Ishikawa, Gyo Kajiwara, Akira Okada, and Akira Inubushi
SHIMIZU Corp., EMC Dept., Business Proposal Div
2-3, Shibaura l-chome, Minato-ku, Tokyo
105-8007, JAPAN
Phone: +81-3-5441-1903 E-mail : ishikawa@prop.shimz.co.jp
Abstract:
The reinforced steel bar and ,the steel frame are commonly used structural
materials for the architectural building and also known as ferromagnetic
materials. When they are exposed in the strong magnetic field in the process of
production, transportation and so on, it is found that they are sometimes
magnetized. The magnetic field generated from these materials causes
discoloration of the CRT for the TV-set. In order to prevent this phenomenon,
we have investigated the degaussing method for the structural materials using
alternative magnetic field. The method proposed in this paper was applied to
the floor of the movie studio, and proved to be enough effective to prevent
discoloration of the CRT.
Key words: Building, Reinforced steel bar, CRT.
Discoloration. Magnetic interference, Degaussing
EMCJ99-137
(2000-03)
A Study of Coverage
for Broadcasting in the Millimeter Waves
Kenji
MURAKAMI, Hiroynki FURUTA, Fumiyasu SUGlNOSHITA, and Yozo UTSUMI
NHK Science and Technical Research Laboratories
1-10-1 1, Kinuta, Setagaya-ku, Tokyo, 157-8510.
JAPAN
TEL:+8 1 -3-5494-2292 / FAX:+81-3-5494-2292 /
E-mail:murakamk@strl.nhk.or.jp
Abstract:
A coverage must be studied if the broadcasting in the millimeter waves are
considered. This paper shows the result of the coverage in the case of low of
transmitting/receiving height and low transmitting power obtained by the
computer simulation, which takes 3D building data such as height and width into
account The "coverage for household"
for fixed receiving station counts 90 percent, and the "coverage on the
road" for mobile receiving station results in 70 percent.
Key words: Broadcasting in the millimeter wave,
radio-wave transmitting, reflected waves, coverage, coverage for household,
coverage on the road