[SI-LIST] trace width working as a plane

Hello, 

could you tell me if there`s an rule of thumb at which width of the trace, the 
trace is working as a plane depending on the signal frequency? 

For example: the width of the trace for a signal-frequency 500kHz must be 
0.15mm to get a 100 ohm impedance. If the width of the trace gets bigger, the 
impedance gets smaller -> you will get more radiation (no exact impedance 
matching). 

But what will happen when the width of the trace gets more and more bigger....? 
 At which point will the "trace width" work as plane and how do I have to 
calculate the correct impedance of this plane (microstrip calculator do not 
work with such width of trace)? Are there any kind of formulas?

best regards
Daniel
 
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