4mil GND trace到底有無效果？

no2892215

When PCB  layout area is not enough, we often use 4mil GND trace to shielding RF clock trace with 4mil spacing.
Is this way enough to avoid RF clock signal to couple other signal trace near the 4mil trace?
Thanks

mic29

u r proposed to refer to 3W rule.  
4 [, ^, P9 b) {% r- b0 kwhen clock trace is 5 mils, u will need 10 mils spacing.
of course GND trace will help, but PTH through holes with proper interval will do it better.
% T0 q: `4 Y( M9 [
google it for detailed information, please!