Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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My Hobby Website:
Microwave shielding - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: Microwave shielding
Mon Apr 25, 2005 4:06 pm
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?
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.
Unread postPosted: Mon Apr 25, 2005 10:27 pm
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