Mechanical EMI shielding - 168 Mhz
Mechanical EMI shielding - 168 Mhz
(OP)
I need to filter ~180 Mhz and lower emissions from an infrared transmitter while minimizing the amount of IR loss. What is the formula for determining the maximum aperture size that will still block a given wavelength or frequency? Is this formula usable to determine mesh size? Our short term solution is a fine wire mesh, but I need to determine the mesh size. Thanks in advance.





RE: Mechanical EMI shielding - 168 Mhz
You may reduce the size of the cavity by using an -- IR xparent -- dielectric with high "e".
<nbucska@pcperipherals.com>
RE: Mechanical EMI shielding - 168 Mhz
W largest dim of port in inches and fc cutoff in Mhz. Approximate attenuation
at 10*fc will be A=27.3*T/W, T in inches (port thickness), A in dB.
RE: Mechanical EMI shielding - 168 Mhz