Microelectronics

1
ESE Andrew Rusek
Applications of Computer Modeling in
Electromagnetic Compatibility (EMC) Tests (Part1)

P8. Field Pattern of Three Radiating
Objects (0.6 GHz) All Sources in
Phase
Field Pattern of Three Radiating Objects (1.0
GHz) All Sources in Phase
P7. Example 2 Simulated EMC Radiation
Test for Three Radiating Objects
Field Directivity Tests for 0.6 GHz, 1.0 GHz, and
1.5 GHz
Test Antenna
Radiating Objects
Field Pattern of Three Radiating Objects (1.5
GHz) All Sources in Phase
Current Distribution in Various Segments of Test
Antenna Versus Frequency. All Sources in Phase
changes of current magnitude show effects of
directivity variations with frequency
Two Cell Phone Antennas, Field Directivity for
0.8 GHz, The Same Phases
P10. Two Cell Phone Antennas, Field Directivity
for 0.8 GHz, Opposite Phases
P9. Example 3 Two Cell Phone Antennas and
Two Receiving Objects
Suspended Object
Cell Phone Antennas
Receiving Objects
Two Cell Phone Antennas Field
Directivity Changes for 1.5 GHz, Opposite Phases
Two Cell Phone Antennas, Field Directivity
Changes for 1.5 GHz, The Same Phases
Grounded Object
The Same Phases
P11. Opposite Phases
Grounded Object
Grounded Object
Summary EMC measurements are performed to
protect electrical equipment from potential
interfering signals caused by uncontrolled and
intentional sources. The presentation includes
examples of simulated basic Controller Area
Network (CAN) experiments, including conducted
and radiated emissions. Simulated CAN immunity
tests are also shown. In addition, results of
computer simulations of EM fields generated by
GHz frequency basic structures are presented.
Necessity of testing GHz devices is due to high
speeds of clocks of computers and signals of new
cell phones. At GHz frequencies the
distribution of EM fields emitted by Devices
Under Test (DUT) become non-uniform. Computer
simulation of experiments can be the way to
reduce time required to find the DUT field
directivity.
2
ESE Andrew Rusek
Applications of Computer Modeling in
Electromagnetic Compatibility (EMC) Tests (Part2)

P2. Example 1
Transceiver Modeling
P1. New Electromagnetic Interference
Issues Investigated at OU GHz frequency range
interference and radiating device
directivity (necessity of introduction of new EMC
standards and measurement methods to
recognize device directivity) Simulations
helpful to detect peaks of radiation, and prepare
experimentation and training Cell phone and
other wireless device interference into sensitive
medical and automotive systems (Hospitals,
Automobiles, etc) GPS and other navigation
instrumentation EMC problems
PRESENTED
Examples of Modeling Example 1 CISPR (EMC
Standards) based conducted and radiated
emissions tests
Immunity tests.
Controller Area Network (CAN) transceivers are
tested (Research completed
in cooperation with DaimlerChrysler) Example 2
Simulated GHz range EMC radiation test for three
radiating objects to observe
field directivity effects Example 3 Example 3
Two Cell Phone Antennas and Two Receiving Objects
Mid-Layer Model of CAN Transceiver
Model of CAN Transceiver with External Components
Common-Mode Filter Structure
P3.
P4. Conducted and Radiated
Emission Test
CAN Transceiver Transmitting Pulses
CAN Receiver Receiving Pulses
Internal Transmitter Model
Twisted Pair Cable
Antenna Model for CISPR 25 Radiated Emission
Tests Developed by Mr. W. Hall, DaimlerChrysler
Internal Receiver Model
P6. Simulated Immunity Tests
P5.
Measured Conducted Emissions Max. freq 5 MHz
Simulated Conducted Emissions
Interference Generator
Measured Conducted Emissions
MHz
Interfering Signals
Simulated Radiated Emissions
Measured Conducted Emissions Max. freq. 50 MHz
Transmitted Signal Received Signal
Interrupted Communication
OK signals