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Anechoic Test Chamber from Rohde & Schwarz

 
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PostPosted: Thu May 10, 2012 4:34 am    Post subject: Anechoic Test Chamber from Rohde & Schwarz Reply with quote

Here is a cool link (below) that shows an anechoic test chamber made by Rohde & Schwarz.

The spikey blue material you see there is foam that is carbon loaded - this helps absorb the Electromagnetic Energy. The shapes are designed such that whatever is reflected heads towards the size, or goes in random directions, generally so that the energy doesn't add coherently.

The turntable the Device Under Test (DUT) rotates on spins the DUT in the azimuth (phi) direction, and the horns rotate to vary the theta direction. In this manner, the full 3D (theta, phi) spherical coordinate radiation pattern can be obtained.

This particular chamber has two receive horns, so that they can do MIMO (multiple-input, multiple output) measurements. The idea here would be to send independent data streams on two antennas, so that you can maximize the throughput of the device. [Laptops and routers are already 2 antenna devices enabling 2x2 MIMO or even 3x3 MIMO. I haven't heard much about MIMO for cell phones over WIFI or CELL frequencies, particularly because on such a small device they would couple together very strongly, which would make it hard to get independent data streams].

The video also shows the AMS32 measurement system/software, which is common in industry.

http://www.engadget.com/2012/05/09/rhode-and-schwarz-anechoic-test-chamber-waves-on/
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