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    Mark ZimmermanTypewritten TextATI Course Schedule:ATI's Practical EMI Fixes:

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    Mark ZimmermanTypewritten TextProfessional Development Short Course On:

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    Mark ZimmermanTypewritten Text Practical EMI Fixes

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    Mark ZimmermanTypewritten TextInstructor:

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  • ELEMENTS OF EMIELEMENTS OF EMI

    SOURCESOF EMI COUPLING

    VICTIM OFEMI

  • EMI CULPRIT AND VICTIMEMI CULPRIT AND VICTIM

    EMISource

    SignalSource

    SignalReceiver

    CULPRIT

    VICTIM

    COUPLING PATH

  • CONDUCTED OR RADIATEDCONDUCTED OR RADIATED COUPLING COUPLING

    SOURCE COUPLING VICTIM

  • Historical EMI/EHistorical EMI/E33--Related IncidentsRelated Incidents

    Operation Restore Democracy (Haiti-1995) Air wings of USS America & USS Eisenhower

    replaced with men & helicopters of 10th Infantry Div. and 75th Ranger Regiment.

    Army aircraft not designed or tested for carrier operation, carriers required to turn off almost all communications and radar surveillance systems.

    Pershing II Nuclear Missile (Germany) Missile motor exploded during routine

    maintenance Electrostatic discharge identified as the

    cause 3 dead

    Blackhawk Helicopter (Germany and USA - 1987) Several potentially fatal incidents and a fatal crash Suspected cause was interference from high

    power radio transmitters Entire fleet grounded for 3 months during

    investigation Extensive test and retrofit program necessary

    USS Forrestal (Vietnam -1969) ZUNI rocket inadvertently launched by a ship radar 134 dead 27 aircraft destroyed $72M damage to ship ($335M in 2000 dollars) Largest Naval loss of life since WW II

    HMS Sheffield (Falkland Islands -1982) Hit by undetected EXOCET missile EMI caused degradation of surveillance

    radar 21 dead, Ship sank 4 days later

    Courtesy of Jose Reza

  • Shielding May Have Avoided Shielding May Have Avoided Some of These ProblemsSome of These Problems

  • Proper Grounding May Have May Have Avoided Some of These ProblemsAvoided Some of These Problems

  • CONCEPTUAL ILLUSTRATION OF CONCEPTUAL ILLUSTRATION OF CONDUCTED AND RADIATED CONDUCTED AND RADIATED

    EMISSIONS AND SUSCEPTIBILITY EMISSIONS AND SUSCEPTIBILITY

  • NARROWBAND AND BROADBAND NARROWBAND AND BROADBAND EMISSIONSEMISSIONS

  • F1

    Vin

    TinT1

    V1

    V1 = F1TinVinT1 = 1/F1

    VinTin

    Filter Affects on a PulseFilter Affects on a Pulse

  • RF Input Output

    Time Domain

    Frequency Domain

    t t

    Ai Ao

    Receiver

    passbandAi Ao

    f f f

    UWB PRF > IFBW UWB PRF > IFBW

  • RF Input Output

    Time Domain

    Frequency Domain

    t t

    Ai Ao

    Receiver

    passbandAi Ao

    f f f

    UWB PRF< IFBWUWB PRF< IFBW

  • THREETHREE--DIMENSIONAL GEOMETRY DIMENSIONAL GEOMETRY ILLUSTRATING GAIN OF ANTENNAILLUSTRATING GAIN OF ANTENNA

  • RECEIVER SUSCEPTIBILITY RECEIVER SUSCEPTIBILITY CHARACTERISTICSCHARACTERISTICS

  • RECEIVER SPURIOUS RESPONSESRECEIVER SPURIOUS RESPONSES

    MixerI.F.RF

    10 MHz

    50 MHz60 MHz

    100 MHz120 MHz

    L.O.110 MHz

    220 MHz

    330 MHz

    210 MHz230 MHz

    320 MHz340 MHz

    fSR = pfLO fIFq

  • RECEIVER INTERMODULATIONRECEIVER INTERMODULATION

    R.F. AmplifierRF AMP 100 MHz100 MHz

    101 MHz

    102 MHz

    fIM = mf1 nf2m = 2; n = 1 (-)m = 3; n = 2 (-)m = 4; n = 3 (-)

  • INTERSYSTEM EMC DESIGN AND EMI INTERSYSTEM EMC DESIGN AND EMI CONTROLCONTROL

    Communication-SystemInterference

    Designand Control

    FrequencyManagement

    Location Management

    TimeManagement

    DirectionManagement

  • Power Source Load

    Figure 4. Illustration of Common Mode Currents

    CMC 1

    CMC 2

    CMC

    IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

    Metallic Structure

    Illustration of Common Mode Currents

  • Power Source Load

    DCM1

    DCM2

    Figure 3. Illustration of Differential Mode Currents

    Illustration of Diff

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