EMC Anechoic Chambers

A professional electromagnetic test environment designed, built, and accepted in accordance with international standards (such as CISPR, IEC, GB, etc.). Through an electromagnetic shielding shell + absorber materials + precision supporting systems, it simulates the outdoor open-field electromagnetic environment indoors, replacing the expensive and weather-dependent Outdoor Open Area Test Site (OATS), to perform full-suite electromagnetic compatibility testing — including radiated emission (EMI) and radiated immunity (EMS) — on electronic and electrical products.

Two Main Types of Anechoic Chambers

Semi-Anechoic Chamber (SAC) — The Most Widely Used

Five surfaces (four walls + ceiling) are lined with RF absorber materials, while the floor retains a metallic reflective surface, simulating the ideal open-field propagation model of "direct wave + ground-reflected wave." This is currently the most popular and ideal EMC test venue worldwide, widely used for radiated emission and radiated immunity testing.

Typical specifications include:

3-meter method: 9m × 6m × 6m

5-meter method: 11m × 7m × 9m

10-meter method: 19m × 12m × 6.5m / 20m × 12m × 8m

Fully Anechoic Chamber (FAC)

All six surfaces (including the floor) are lined with RF absorber materials, simulating a free-space, reflection-free environment. It is primarily used for antenna pattern measurement, Radar Cross Section (RCS) testing, and high-precision EMS testing. The construction cost is higher, and the available test space is relatively more limited compared to SAC.

Key Differences at a Glance

The Semi-Anechoic Chamber (SAC) covers five surfaces with absorbers and keeps a metallic reflective floor, simulating an open field with ground reflection. It is the go-to solution for most EMI and EMS tests. The Fully Anechoic Chamber (FAC), on the other hand, lines all six surfaces — including the floor — with absorbers to create a completely reflection-free free-space environment. It is mainly reserved for antenna measurements, RCS testing, and high-precision immunity work. SAC offers larger test space at a lower cost, while FAC delivers superior accuracy at a significantly higher price.