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Microwave shielding - RF Cafe Forums
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Shafique
Post subject: Microwave shielding
Unread postPosted:
Mon Apr 25, 2005 4:06 pm
Hi,
If I'm not concerned about
interference or EMI, should I conceal my Microwave circuit, (operating
at 2.4GHz) in a metal box that's grounded? The circuits are MMIC based
VCOs and amplifiers. What would be the disadvantage of not doing so?
Shafique
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TJ
Post subject:
Unread
postPosted: Mon Apr 25, 2005 4:30 pm
The only reason you might
want to do a shield in your case is if your circuit might interfere
with something else in the area. Of course, there is the FCC Part 15
unintentional radiator thing wou'll have to worry about if you plan
to commercialize the design.
TJ
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Guest
Post subject:
Unread postPosted: Mon Apr 25, 2005 10:27 pm
Hello,
There is no disadvantage of shielding your circuits.
This is a very common practice in RF design and PCB layout. I am using
a double shielding option, namely shielding cans for the first prototype
(There are customes sizes of shielding cans) and you can design the
size of each module in your PCB to match to the size of the can. And
for the final revision that will go to production there are holes that
will be used to tighten a cover with screws around the PCB layout. This
cover will have spaces inside that surround each module and isolate
it from the others. This method gives at least 70dB of isolation between
the different parts of the PCB. Of course that for better isolation
you can use gasket of shielding material as often done to seal possible
scratches.
Posted
11/12/2012
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