Radio Frequency Interference Characteristics of Plate-Like Soft Magnetic Powders-Polymer Composites

2006 ◽  
Vol 510-511 ◽  
pp. 826-829
Author(s):  
Sang Woo Kim ◽  
Y.W. Yoon ◽  
G.Y. Kim ◽  
Kyung Sub Lee
Keyword(s):  
Radio Frequency ◽  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Noise Suppression ◽  
Compaction Pressure ◽  
Complex Permeability ◽  
Al Alloy ◽  
Radio Frequency Interference ◽  
Soft Magnetic ◽  
Dielectric Resonance

Radio frequency interference characteristics of plate-like Fe-Si-Al alloy powders-polymer composites were investigated for effective noise suppression. Broadband reflection loss characteristics were exhibited in the composites below a critical compaction pressure of 1.56 x 108 N/m2, while narrowband characteristics were shown in the composites above the critical pressure. Although the composites at 2.34 x 108 N/m2 had the highest complex permeability and complex permittivity, the loss properties did not show the broadband characteristics. The peculiar broadband characteristics were obtained in the composites with wideband dependency of the imaginary part of permittivity and permeability. These findings led us to conclude that the broadband electromagnetic interference characteristics of the composites are caused by the coupling effects of magnetic and dielectric resonance in the radio frequency range.

Elimination of noise in telemetry systems by pulse-width discriminator

1980 ◽  
Vol 239 (1) ◽  
pp. H133-H136
Author(s):  
A. Livnat ◽  
R. P. Johnson ◽  
J. E. Zehr
Keyword(s):  
Radio Frequency ◽  
Electromagnetic Interference ◽  
Pulse Width ◽  
Pulse Interval ◽  
Telemetry System ◽  
Radio Frequency Interference ◽  
Pressure Measurements ◽  
Frequency Range ◽  
Noise Filter ◽  
Interval Ratio

A pulse-width-discriminator circuit (PWD) was developed and applied for noise reduction in an FM pulse-interval-ratio modulation telemetry system. The PWD was incorporated as an intermediary between the tuner and the demodulator. The application of the circuit as a noise filter is a result of its ability to distinguish between pulses of different durations and its ability to eliminate pulses whose durations are less than some predetermined value. Since spikes of radio-frequency interference (RFI) occurring at the tuner output were of significantly shorter duration than the encoding pulses, they were virtually eliminated by the PWD. This prevented false triggering of the demodulator and resulted in a noise-free final demodulated output signal. This system was tested during telemetered blood pressure measurements in an unrestrained dog and proved to be extremely effective in eliminating spurious noise caused by electromagnetic interference in the radio-frequency range.

Effect of radio-frequency noise suppression on the coplanar transmission line using soft magnetic thin films

2003 ◽  
Vol 93 (10) ◽  
pp. 8002-8004 ◽  
Author(s):  
Ki Hyeon Kim ◽  
Masahiro Yamaguchi ◽  
Ken-Ichi Arai ◽  
Hideaki Nagura ◽  
Shigehiro Ohnuma
Keyword(s):  
Thin Films ◽  
Radio Frequency ◽  
Transmission Line ◽  
Noise Suppression ◽  
Magnetic Thin Films ◽  
Frequency Noise ◽  
Soft Magnetic

scholarly journals Teaching Electromagnetic Interference on Microcontrollers through Lab Experiments

2013 ◽  
Vol 3 (2) ◽  
pp. 4
Author(s):  
Chiu Choi
Keyword(s):  
Wireless Communication ◽  
Radio Frequency ◽  
Power Supply ◽  
Electromagnetic Interference ◽  
Communication Technologies ◽  
Radio Frequency Interference ◽  
Current Interest ◽  
Lab Experiments ◽  
External Sources ◽  
Sufficient Magnitude

<p class="Abstract">New lab experiments were developed for the students to investigate the effect of electromagnetic interference on the operation of microcontrollers. The objectives of the experiments include exposing students to the effect of noisy power supply on microcontroller performance and to learn how to use modern instruments for recording the results. In the experiments, the noise is restricted to electromagnetic interference picked up by the power supply conductors from external sources at radio frequencies. As wireless communication technologies have been widely used, such lab investigation is of current interest to the students. There was no simple way to produce the radio frequency interference of sufficient magnitude in our lab. A method was used to emulate the picking up of such interference on the power supply conductors. This paper describes such method. It also describes the new experiments, their benefits for the students, the evaluations, and suggestions for improvements.</p>

Effect of Complex Permeability on Circuit Parameters of CPW with Magnetic Noise Suppression Sheet

2020 ◽  
Vol E103.B (9) ◽  
pp. 899-902
Author(s):  
Sho MUROGA ◽  
Motoshi TANAKA ◽  
Takefumi YOSHIKAWA ◽  
Yasushi ENDO
Keyword(s):  
Noise Suppression ◽  
Complex Permeability ◽  
Magnetic Noise
Sign in / Sign up

Export Citation Format

Share Document