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>

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.

scholarly journals OVERVIEW OF ELECTROMAGNETIC INTERFERENCE ISSUES IN AIRCRAFT

2018 ◽  
Vol 6 (2) ◽  
pp. 53-59
Author(s):  
Abhishek Kumar
Keyword(s):  
Wireless Communication ◽  
Electromagnetic Interference ◽  
Communication Systems ◽  
Electromagnetic Induction ◽  
External Source ◽  
Wireless Communication Systems ◽  
Radio Frequency Interference ◽  
Interference Effects ◽  
Electrostatic Coupling ◽  
Modern Era

In the modern era, due to several confliction or uncertainty in the aircraft, Electromagnetic Interference (EMI) or Radio Frequency Interference (RFI) issues occurred, frequently. The main reason behind it several disturbances generated by an external source which imitate wireless circuits with the help of conduction, electrostatic coupling, and electromagnetic induction. These disturbances may decrease the performance of the circuits or sometimes fully stop the operations. Main challenges in EMI are modeling and simulation for modern and future wireless communication systems and networks taking into account nonlinear interference effects. In this paper, overviews of several issues of EMI or RFI are illustrated.

scholarly journals Testing RFoF link for transmitting HF-OTHR signal between transmitter and receiver shelters

2021 ◽  
Vol 13 (1) ◽  
pp. 13-18
Author(s):  
Pavle Petrović ◽  
Bojan Džolić ◽  
Nikola Lekić ◽  
Nemanja Grbić ◽  
Ana Ćupurdija ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Electromagnetic Interference ◽  
Coaxial Cable ◽  
External Sources

HF-OTHR site contains two equipment shelters, up to 1 km away from each other, that need to be connected for transmitting a FMCW signal. This connection, if realized using a coaxial cable, has shown itself to be vulnerable to external electromagnetic discharges, which can damage the sensitive radar equipment. This paper explores and tests the possibility of using Radio-Frequency-over-Fiber (RFoF) link as an alternative to a coaxial cable for transmission of signal, in order to ensure the immunity from external sources of electromagnetic interference (EMI).

scholarly journals Cooperative Qos Control Scheme Based on Power Allocation and Scheduling of WDM-OWC Network

2019 ◽  
Vol 8 (2) ◽  
pp. 436-440
Keyword(s):  
Wireless Communication ◽  
Radio Frequency ◽  
Power Allocation ◽  
Electromagnetic Interference ◽  
Q Factor ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
High Data ◽  
Wireless Communication Network ◽  
Free Spectrum

In the past two decades, transfer of data can be possible with the combination of radio frequency and optical wireless communication (OWC) system. An alternative to radio frequency and fiber optic communication system is an OWC. Optical wireless Communication network have high data rate, license free spectrum, high immune to electromagnetic interference, low power and cost of optical components used. In this paper we have designed a WDM-OWC system for a range of 800 Km. Different simulation module like power allocation and scheduling have been performed on WDM-OWC. With Power allocation in which Q-factor and output power increases, whereas BER decreases other module is scheduling of OWC and it is found that 100 GHz of frequency spacing at a wavelength of 1550 nm is the best efficient in terms of Q-factor and BER.

scholarly journals Cooperative QOS Control Scheme Based on Power Allocation and Scheduling of WDM-OWC Network

2019 ◽  
Vol 8 (3) ◽  
pp. 1871-1875
Keyword(s):  
Wireless Communication ◽  
Radio Frequency ◽  
Power Allocation ◽  
Electromagnetic Interference ◽  
Q Factor ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
High Data ◽  
Wireless Communication Network ◽  
Free Spectrum

In the past two decades, transfer of data can be possible with the combination of radio frequency and optical wireless communication (OWC) system. An alternative to radio frequency and fiber optic communication system is an OWC. Optical wireless Communication network have high data rate, license free spectrum, high immune to electromagnetic interference, low power and cost of optical components used. In this paper we have designed a WDM-OWC system for a range of 800 Km. Different simulation module like power allocation and scheduling have been performed on WDM-OWC. With Power allocation in which Q-factor and output power increases, whereas BER decreases other module is scheduling of OWC and it is found that 100 GHz of frequency spacing at a wavelength of 1550 nm is the best efficient in terms of Q-factor and BER.

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