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RF transmission testing inside a Faraday cage

ralphjy

Since there is RF expertise in the community, so I thought I'd try to get some insight into an area where I don't have much experience.

I'm currently working a project testing BLE transmitters and my current workroom location can experience a fair amount of RF noise in the 2.4GHz ISM band (primarily due to existing WiFi and Bluetooth/BLE).  My primary mitigation when possible is to increase distance from or turn off noise sources.  I started thinking about whether I could test within an RF shield.  My previous experiences with testing within RF enclosures was over 40 years ago and we used room scale enclosures to house the equipment and operators.

I was wondering if anyone has tried small scale enclosures to shield only the EUT and measurement setup.  What would be a good minimum size at this frequency?

TIA for any feedback.

Ralph

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  • Thanks for all your input and sorry for my unresponsiveness - I had an unplanned trip to urgent care which consumed the better part of my day.  Urgent care is definitely a misnomer lol...

    I realized that I was a little ambiguous about the specific type of information that I was looking for.  For an antenna based transmission system, what is the minimum separation between the antenna and the shield that would not compromise the RF transmission.  Question is oversimplified as it will be affected by the type of antennas used.  I guess I was trying to figure out if there was any value in building a small cage for reducing measurement noise.  This is probably a science project Smile.

  • in reply to ralphjy

    Your description doesn't lead to a quote but is sufficient to frame some requirements. I trust your urgent care needs are satisfied. It is never a place I visit I suspect I will die from whatever ails me because I avoid going to urgent care for treatment. Our wait times could be in the double digits hours.

    The cage I viewed was approximately a 12X12 cube used to test cell phones. I can't recall if they used it to test antenna structures but I suspect it would. Other than a desk with test equipment and mounting points ( you were not allowed to pierce the walls, even with a pin), there was little in it. I often wondered about power distribution in the room but I wasn't present when it was installed to ask probing questions.

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  • in reply to ralphjy

    Your description doesn't lead to a quote but is sufficient to frame some requirements. I trust your urgent care needs are satisfied. It is never a place I visit I suspect I will die from whatever ails me because I avoid going to urgent care for treatment. Our wait times could be in the double digits hours.

    The cage I viewed was approximately a 12X12 cube used to test cell phones. I can't recall if they used it to test antenna structures but I suspect it would. Other than a desk with test equipment and mounting points ( you were not allowed to pierce the walls, even with a pin), there was little in it. I often wondered about power distribution in the room but I wasn't present when it was installed to ask probing questions.

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