| ??? 11/24/11 12:53 Read: times |
#184883 - Components must work at 2,4GHz... Responding to: ???'s previous message |
Mahmood said:
Do you mean the board inside the faraday cage or the board carrying the faraday cage or both? Both. As you need to solder SMD components on a pcb, you must have a good connection from the corresponding ground plane to the Faraday cage. This is valid for both, the pcb within the Farady cage and the pcb carrying the Faraday cage. If there's the least inductance between ground plane of pcb and Faraday cage (rf-plane) then any filtering is sensless. Mahmood said:
do you have typical values for the R and Cs? As you intend to filter at 2,4GHz it's difficult to give concrete numbers. In any case you need to use SMD components that are still working at these high frequencies. So, only 0603 ferrite beads specified up to GHz-range can be used. The same with SMD capacitors. You could try to use the series resonance of cap to enhance the filtering, so caps of about 10pF could be helpful. Maybe it's enough to have only such a cap at each signal line to shunt interference to ground. Maybe no ferrite is neededed, maybe a 22...220R resistor is better suited than a ferrite. You must experiment a bit. The filtering of DC supply is also demanding. Here again SMD parts should be used which work at these high frequencies. Kai Klaas |
| Topic | Author | Date |
| Faraday Cage | 01/01/70 00:00 | |
| Pi-filters are best... | 01/01/70 00:00 | |
| Pi Filters | 01/01/70 00:00 | |
| Components must work at 2,4GHz... | 01/01/70 00:00 | |
| RFI problems | 01/01/70 00:00 | |
| details | 01/01/70 00:00 | |
| and what is solution? | 01/01/70 00:00 | |
| no solution found yet | 01/01/70 00:00 | |
| Faraday cage | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| Maybe Two | 01/01/70 00:00 | |
| even more | 01/01/70 00:00 | |
| Only 3pF... | 01/01/70 00:00 | |
but only 3s | 01/01/70 00:00 | |
| wifi channels | 01/01/70 00:00 | |
| Roving networks | 01/01/70 00:00 | |
| which channel? | 01/01/70 00:00 |