EMI Suppression Filters (EMC and Noise Suppression)Radiated noise evaluation

■Evaluation system

Measurement frequencies ：	150 kHz to 1 GHz
Test standard ：	CISPR25 Ed.3 (150 kHz to 1 GHz)
DUT ：	CAN transceiver (made by company A)
Evaluation items ：	Common mode choke coils （DLW43SH510XK2）

for automotive LANs Suppression of noise in CANs using common mode choke coils

Radiated noise evaluation / Table of equipment used

■Evaluation results No filter used, 250 kHz pulses

■Evaluation results DLW43SH510XK2 used, 250 kHz pulses

: A noise-suppression effect was achieved by adding the DLW43SH510XK2.
(Noise was reduced by 25.1 dB at a 20.5 MHz vertical polarized wave frequency.)

■Evaluation results No filter used, 500 kHz pulses

■Evaluation results DLW43SH510XK2 used, 500 kHz pulses

: By adding the DLW43SH510XK2, a noise-suppression effect was achieved.
(Noise was reduced by 17.8 dB at a 21.0 MHz vertical polarized wave frequency.)

Summary of radiated noise evaluation effects

■250 kHz pulses

When no filter was used, a high level of noise was found from 150 kHz to 30 MHz.
By adding choke coil DLW43SH series, a noise-suppression effect was achieved.

The DLW43SH series achieved a noise-suppression effect of approx. 26 dB at a 20.5 MHz vertical polarized wave frequency.

■500 kHz pulses

When no filter was used, a high level of noise was found from 150 kHz to 30 MHz.
By adding choke coil DLW43SH series, a noise-suppression effect was achieved.
A noise-suppression effect of approx. 18 dB at a 21.0 MHz vertical polarized wave frequency was achieved.

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EMI Suppression Filters (EMC and Noise Suppression)Radiated noise evaluation

Summary of radiated noise evaluation effects

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