1. ESE – Andrew Rusek
Applications of Computer Modeling in Electromagnetic Compatibility (EMC) Tests (Part1)
P 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
P 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
P10. Two Cell Phone Antennas, Field Directivity
for 0.8 GHz, Opposite Phases
Two Cell Phone Antennas, Field Directivity
for 0.8 GHz, The Same Phases
P 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
P 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)
P Example 1: Transceiver Modeling
P 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
Model of CAN Transceiver with External Components
Mid-Layer Model of CAN Transceiver
Common-Mode Filter Structure
P3.
P Conducted and Radiated Emission Test
CAN Transceiver
Transmitting Pulses
Internal Transmitter Model
CAN Receiver
Receiving Pulses
Twisted Pair Cable
Antenna Model for CISPR 25 Radiated Emission Tests
Developed by Mr. W. Hall, DaimlerChrysler
Internal Receiver Model
P 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
Interrupted Communication
OK signals