| ??? 03/15/11 07:12 Modified: 03/15/11 07:13 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#181586 - may not be (just) intereference between antennas... Responding to: ???'s previous message |
It may not be (just) intereference between the antennas - it could (also) be intereference between other parts of the circuits...
Mahmood Elnasser said:
I isolated ground plane of WIFI from the rest of the circuit ground plane and made it connect to a star point under the GPS module with a wire, and horray!! Remember that the ground plane isn't the only place where coupling can occur! Are the power supplies to the WiFi and GSM also well-isolated? Maybe you should have the entire WiFi part of the circuit in a screening "can" and/or the entire GPS part (not just the module) in a separate can? ie, this kind of thing: 
http://www.hitec.co.uk/rf-can-screening.htm look at this picture of the insides of an iPhone: http://www.ifixit.com/Teardown/...down/599/2 Note that you can see at least 2 separate screening cans I'm using switching regulator LM2576S-3.3 is this good enough It probably depends more on your particular implementation than the chip itself. Have you checked with a scope? should I experiment with linear regulator? a linear post-regulator may well be a very good idea... |
| Topic | Author | Date |
| GPS wifi interference problems | 01/01/70 00:00 | |
| Multi-Antenna Positioning | 01/01/70 00:00 | |
| External antenna | 01/01/70 00:00 | |
| I guess... | 01/01/70 00:00 | |
| RF voodoo magic | 01/01/70 00:00 | |
| PCB layout issue | 01/01/70 00:00 | |
| External GPS Antenna?? | 01/01/70 00:00 | |
| Only internal | 01/01/70 00:00 | |
| may not be (just) intereference between antennas... | 01/01/70 00:00 | |
| Multi Antenna Cables / Post Filtering | 01/01/70 00:00 | |
good news | 01/01/70 00:00 |