What is SFC Scattered Field Chamber

Sure, here is a technical explanation of an SFC (Scattered Field Chamber) along with an image for better understanding:

Scattered Field Chamber (SFC)

A Scattered Field Chamber (SFC) is a specialized type of electromagnetic chamber used to test and characterize the electromagnetic behavior of electronic devices and systems. Unlike an anechoic chamber that absorbs electromagnetic waves, an SFC utilizes strategically placed scattering elements to create a controlled and predictable scattered field environment.

Components of an SFC:

• Chamber Walls: The walls of an SFC are typically constructed from metal and lined with absorbing materials to minimize reflections from the chamber walls themselves.
• Scattering Elements: These elements, like spheres, cones, or dihedral panels, are strategically positioned within the chamber to scatter incident waves and create a diffused electromagnetic field. The size, shape, and distribution of these scattering elements determine the characteristics of the scattered field.
• Turntable (Optional): An SFC may incorporate a turntable to rotate the device under test (DUT) within the scattered field, allowing for the measurement of emissions or susceptibility from various angles.

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Operation of an SFC:

• The device under test (DUT) is positioned within the chamber and excited with a specific signal.
• The incident signal interacts with the scattering elements, generating a diffused electromagnetic field that fills the chamber.
• The scattered field impinges on the DUT, and its effects on the DUT's performance or emissions are measured.

Applications of SFCs:

• Emissions Testing: SFCs are used to measure the electromagnetic emissions of electronic devices to ensure they comply with regulatory standards. The scattered field environment simulates real-world scenarios where the device might encounter reflections from surrounding objects.
• Immunity Testing: By exposing the DUT to a controlled scattered field, SFCs can assess the device's susceptibility to electromagnetic interference (EMI). This helps ensure the device functions reliably in environments with potential EMI sources.
• Antenna Testing: SFCs can be used to characterize the radiation patterns and performance of antennas in a controlled scattered field environment.

Benefits of SFCs:

• Realistic Simulations: The scattered field environment within an SFC provides a more realistic representation of real-world electromagnetic conditions compared to an anechoic chamber.
• Reduced Measurement Uncertainty: The diffused nature of the scattered field helps minimize the impact of standing waves and reflections within the chamber, leading to more accurate and repeatable measurements.
• Versatility: SFCs can be configured with different scattering element arrangements to simulate various propagation environments.

In conclusion, Scattered Field Chambers (SFCs) are valuable tools for testing and characterizing the electromagnetic performance of electronic devices and systems. By creating a controlled and diffused electromagnetic field environment, SFCs enable engineers to assess a device's emissions, susceptibility, and antenna performance under more realistic conditions.