Echo-free shielded chambers are shielded chambers where walls, ceiling, and floor are completely covered with a radio-absorbing material. Such chambers are designed to measure antenna characteristics and research work related to the propagation of radio waves in space.

The echo-free shielded chambers simulates an open space where there are no radio wave reflections from the walls, ceiling, or floor.

Operating frequency range of anechoic chambers: from 10 kHz to 18 GHz or 40 GHz.

Echo-free chambers can be radio frequency and acoustic. In radio-frequency cameras there is no reflection of radio waves from walls (EDSS). In acoustic cameras there is no sound reflection from walls (AEDSS).

All supplied cameras are certified with the issuance of appropriate documents.

Radio-absorbing material is necessary to reduce or eliminate the reflection of electromagnetic waves. It can be housed in a wave-proof enclosure or used as a stand-alone solution.

When integrated into shielded rooms, it creates an anechoic chamber to provide:

— Accurate reproducible test conditions for EMC (electromagnetic compatibility) and antenna (RF/hyperfrequency) measurements;

— an environment similar to a free space environment.

The size of the shielded structure and the location of the selected RPM guarantee operation in a specific test area in the frequency range from a few MHz to several tens of GHz.

The height of the absorbers (which depends on wavelength) depends on the desired low frequency along with the desired level of reflectivity. As they penetrate, the waves are gradually absorbed or reflected.

The performance of the absorber is determined by the energy reflected, not the energy absorbed. This parameter is known as reflectivity and is measured in dB. A reflectivity of -10 dB indicates a 90% reduction in incident electromagnetic waves, and a reflectivity of -50 dB indicates a reduction of 99%.

Reflectance values are tested at the factory and/or after installation of the anechoic chamber based on applicable standards or a specific test plan.

Allowable power is another criterion to be considered in light of the intended application (antenna measurements, etc.).

Depending on your needs, our experience allows us to offer you the right RPM for your specific camera design, equipment and/or installation.