magnetic shielding of electric components while allowing signal
magnetic shielding of electric components while allowing signal
(OP)
So basically i have this powerful electromagnet that generates an electromagnetic field that can levitate another magnet and withhold a load of 12oz and still levitate:

My problem is, I want to be able to use electronics and send wireless signals through this strong magnetic field. I can shield the electronics with a thin metal sheet but my wireless transmitter cannot have this protection, since it would essentially prevent radio transmission. Additionally, even if the transmitter can be allowed to transmit, the magnetic field would have some major interference on the data transmission(right?). So I was wondering if you guys know of any special way to shield the transmitter so that
1) the electronics shielded within this magnetic field wont fry
2) the signal gets transmitted
Is a faraday's shield even going to be effective in this situation? Should I consider Mu-metal instead? Or do a combination?

My problem is, I want to be able to use electronics and send wireless signals through this strong magnetic field. I can shield the electronics with a thin metal sheet but my wireless transmitter cannot have this protection, since it would essentially prevent radio transmission. Additionally, even if the transmitter can be allowed to transmit, the magnetic field would have some major interference on the data transmission(right?). So I was wondering if you guys know of any special way to shield the transmitter so that
1) the electronics shielded within this magnetic field wont fry
2) the signal gets transmitted
Is a faraday's shield even going to be effective in this situation? Should I consider Mu-metal instead? Or do a combination?





RE: magnetic shielding of electric components while allowing signal
Wireless signals will pass right through.
RE: magnetic shielding of electric components while allowing signal
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(2B)+(2B)' ?
RE: magnetic shielding of electric components while allowing signal
I was assuming it was a slowly varying field. If it's a PWM at high frequencies, then it could cause all sorts of problems.
RE: magnetic shielding of electric components while allowing signal
Supposing that it is pwm though, what would the solution be?
RE: magnetic shielding of electric components while allowing signal
Dan - Owner

http://www.Hi-TecDesigns.com
RE: magnetic shielding of electric components while allowing signal
Obviously you want to have a lot of power supply decoupling at the wireless modules because that (assumed) 60 hz noise will possibly cause some demodulation/modulation problems. So big caps! Also, try to avoid long power supply leads, and battery operation would be much better.
Really the only thing about a wireless module that can not be inside of a metal farraday cage is the antenna. And the antenna can be coupled to the modules thru a very small capacitor (perhaps 100 pf) that will not pass the 60 Hz. I would make a mu-metal box to completely enclose the wireless module. I would have the antenna go thru the wall of the box with an SMA connector. I would have a series 100 pf cap between the sma center contact and the wireless module. I would use honkin big emi filtercons to get dc power thru the wall. I would use smaller filtercons (maybe 1000 pf shunt) to get the data in/out.
So, try unshielded first. If a problem, use the shield box.
www.MaguffinMicrowave.com
Maguffin Microwave wireless design consulting
RE: magnetic shielding of electric components while allowing signal
RE: magnetic shielding of electric components while allowing signal
RE: magnetic shielding of electric components while allowing signal
www.MaguffinMicrowave.com
Maguffin Microwave wireless design consulting