ASTM D4935-18 - MEASURING THE ELECTROMAGNETIC SHIELDING EFFECTIVENESS OF PLANAR MATERIALS
The
Standard ASTM D4935-18 describes how measuring the electromagnetic (EM) shielding effectiveness (SE) of a planar material for a plane, far-field EM wave.
The measurement method is valid over a frequency range of
30 MHz to 1.5 GHz. These limits are not exact, but are based on decreasing displacement current as a result of decreased capacitive coupling at lower frequencies and on overmoding (excitation of modes other than the transverse electromagnetic mode (TEM)) at higher frequencies for the size of specimen holder described in this test method.
This test method is not applicable to cables or connectors.
EMCTEST Technologies is a leading test laboratory in Italy and Europe for
electromagnetic shielding effectiveness testing. Thanks to advanced instrumentation and extensive experience in the field, we perform
measurements from 10 kHz to 110 GHz on materials and devices intended for
industrial, telecommunications, medical, military, automotive, railway, marine, aerospace, scientific, governmental, and civil applications.
Typical Test Frequencies
- Low frequency: 10 kHz, 100 kHz, 500 kHz, 1 MHz
- Mid frequency: 10 MHz, 30 MHz, 100 MHz, 433 MHz, 700 MHz, 800 MHz, 900 MHz
- High frequency (RF and microwave): 1 GHz, 1.5 GHz, 2.4 GHz (ISM band), 3 GHz, 5 GHz, 5.8 GHz, 6 GHz, 10 GHz
- Very high frequency: 17 GHz, 18 GHz, 24 GHz (ISM – Industrial, Scientific, and Medical bands), 26.5 GHz, 30 GHz, 35 GHz, 40 GHz, 50 GHz, 60 GHz (wireless communication and radar applications)
- Millimeter wave: 75 GHz, 77 GHz (automotive radar systems), 94 GHz, 100 GHz, 110 GHz
Our test laboratory is equipped to perform shielding effectiveness measurements up to 110 GHz.
You can read more on the home page. If you are looking for a laboratory to test your product, you are in the right place – feel free to contact us by email or phone.
Measurements are made according to customer specifications or in accordance with the main standards as below:
