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  • Copyright 2016 E&R TECH. All rights reserved.

    EMC & NOISEEngineering ServiceProduct / System / EFS / EMC Management Plan.

    http://www.enrc.co.kr

    2016 CST SI / PI / EMC Conference

    Radiator for ALSE validation(By CST MICROWAVE STUDIO)

    http://www.enrc.co.kr/index.php

  • Radiator for ALSE validation

    2016.9.6

  • What is the ALSE?

    ALSE validation method

    Radiator for ALSE validation

    Simulation model & results

    Measurement setup & results

    Effects of 50 load

    ALSE influence parameters

    4

    6

    7

    8

    15

    21

    24

  • What is the ALSE?

    ALSE(Absorber-lined shielded enclosure)

    - Shielded enclosure with radio frequency-absorbing material on its internal ceiling andwalls (CISPR 25)

    CISPR25 Ed. 3.0 : 2008

  • What is the ALSE?

    ALSE(Absorber-lined shielded enclosure)

    Reference : google image (https://www.google.com)

  • ALSE validation method

    Ground plane

    Transmit

    Receive

    (Direct wave + Reflected wave)

    Variable height

    (1 m ~ 4 m)

    Direct wave

    Reflected wave

    CISPR 16Verified by NSA

    (Normalized Site Attenuation)

    CISPR 25

    Ground plane

    TransmitReceive (Only Direct wave)

    Constant height

    (1 m)

    Direct wave

    Reflected wave

    Ground plane

    Verified by ???

  • ALSE validation method (CISPR 25 Ed. 4)

    Radiator for ALSE validation

  • ALSE validation method (CISPR 25 Ed. 4)

    Modelled long wire transmitting antenna

    Radiator modelling

    Front view

    500mm

    50mm

    Top view

    150mm100mm

    100mm

    Material : Aluminum (Lossy metal)

    Material : Copper (Lossy metal)

  • ALSE validation method (CISPR 25 Ed. 4)

    Radiator for ALSE validation (VSWR)

    5

    10

    15

    20

    25

    0 100 200 300 400 500 600 700 800 900 1000

    VS

    WR

    frequency in MHz

    CISPR 25 Ed.4 vs CST simulation model

    without 10 dB attenuation

  • ALSE validation method (CISPR 25 Ed. 4)

    Ground plane modelling

    1m

    2.5m

    Ground plane

    0.2m

    0.129m

    Straps

    0.9m

    0.129m

    0.2m

    Material : Copper (Lossy metal)

  • ALSE validation method (CISPR 25 Ed. 4)

    Rod antenna modelling for antenna factor

    : 1100 mm : 30 mm : 600 X 600 mm

    10 k

    1 V/mPlane wave

    (dB/m) = (dBV/m) 10k (dBV)

  • ALSE validation method (CISPR 25 Ed. 4)

    Simulation setup & results 0.15 ~ 30 MHz

    (dBuV/m) = 10k (dBuV) + (dB/m) 10dB(attenuation)

    Antenna configuration for reference measurement

    method below 30 MHz

    Conductive

    floor

    Radiator

    Monopole

    Ant.

    50 ohm

    Load

    Excitation

    1 Vrms

    Simulation setup

    Ant. Distance

    1m

  • ALSE validation method (CISPR 25 Ed. 4)

    E-field

    Monitor

    (1 m)

    Test Table

    (Ground)

    Radiator

    @ 300 MHz

    50 ohm

    Load

    Excitation

    1 Vrms

    Simulation results 30 ~ 1000 MHz

    Simulation setup

  • ALSE validation method (CISPR 25 Ed. 4)

    Simulation results

    1000 ~ 1200 mm

    GND CISPR 25 Ed.4 Draft

    Test table ground plane

  • ALSE validation method (CISPR 25 Ed. 4)

    Signal

    Generator

    50

    load10 dB attenuation

    90 degree

    connector

    Antenna

    (1 m height)

    EMI

    ReceiverALSE

    1m

    GND Plane (Test table)

    Table height = 0.9 m

    Output = 120 dBV

    MA

    M0= direct connection (120 dBuV - cable loss)kAF= Antenna factor (dB(1/m))

    6 dB, 90 %

    = 120 + 0 +

    Ferrite core

    Ferrite core

    = , ,,

    Measurement setup

    Frequency range[MHz]

    Frequency step[MHz]

    Number of points

    015 ~ 29.95 0.2 150

    30 ~ 199 1 170

    200 ~ 1000 5 161

    0.15 ~ 1000 - 481

  • ALSE validation method (CISPR 25 Ed. 4)

    Matching Unit

    (Attenuation)

    Attn.50

    load

    RadiatorSignal

    Generator

    Radiation ,

    Attenuation

    Broadband impedance matching

    without attn. with attn.

    Broadband

    Matching

    without attn.

    with attn.

  • ALSE validation method (CISPR 25 Ed. 4)

    Measurement results ()

  • ALSE validation method (CISPR 25 Ed. 4)

    Measurement results ()

  • ALSE validation method (CISPR 25 Ed. 4)

    Measurement results ()

  • ALSE validation method (CISPR 25 Ed. 4)

    Measurement results

    Dimension E&R ALSE

    L (m) 6.15

    W (m) 7.2

    H (m) 3.15

    G.P. size (m) 2.7 X 1.8

    Bonding Wall

    Number of straps 9

    Width of straps (cm) 20

  • ALSE validation method (CISPR 25 Ed. 4)

    Effect of 50 load

    Ideal port

    with attenuation & 50 load

    50 ohm

    Load

    Attenuation

    Stray inductance & capacitance

    500 ~ 700 MHz

    50 load -

  • ALSE validation method (CISPR 25 Ed. 4)

    Effect of 50 load

    Reference : CISPR/D/JWG A-SITE-VAL/N075

    B type 600 MHz

    Vertical Polarization

    Conclusion : Additional requirements for 50 ohm load or transmitting antenna should be added

    50 load - ()

  • ALSE validation method (CISPR 25 Ed. 4)

    Effect of 50 load

    200 400 600 800 1000

    40

    50

    60

    70

    80

    90

    100

    110

    120

    130

    dB

    uV

    /m

    Freq [MHz]

    Load A

    Load BVertical Polarization

    200 400 600 800 1000

    40

    50

    60

    70

    80

    90

    100

    110

    120

    130

    dB

    uV

    /m

    Freq [MHz]

    Load A

    Load BHorizontal Polarization

    Load

    Emax

    Emax

    Load A

    Load B

    50 load -

  • ALSE validation method (CISPR 25 Ed. 4)

    ALSE influence parameters

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