Resistance between PCB trace and GND plane

[hioyo]

Dear Team,

I don't know this is a nonsense question or not.
Please see the below image.
You can see the trace which is red in color and it is surrounded by a GND plane.
The clearance is shown with Yellow lines and it is.12mm.

My question is what is the resistance existing in the region of clearance(Shown with blue lines)

Regards
HARI

 

[andre_luis]

This resistance is high enough to be considered negligible for practical purposes.

 

[FvM]

Negligible for many, but possibly not for all purposes. Volume and surface resistance values for PCB substrates are given in datasheets with large margin between typical and guaranteed values. You can calculate after you have defined the test geometry completely, which istn't done in your picture (no test structure length, no substrate thickness, no specification of bottom side).

You should also consider that the actual resistance depends strongly on surface contamination, relative humidity and water absorbed by the PCB. A typical situation to get unsuficient resistance is surface condensation.

 

[KlausST]

Hi,

If you are concerened about leakage current, then read about "guarding of signals".

Klaus

 

[ILIA KALISTRU]

Please also note that the clearance you provided is not enough to calculate resistance becasue it depends on the length of the trace as well.

 

[hioyo]

Thank you....
I want that resistance to be in Tera Ohms.

This resistance is high enough to be considered negligible for practical purposes.

--- Updated Feb 15, 2022 ---

T

Hi,

If you are concerened about leakage current, then read about "guarding of signals".

Thank you...
I am not in a situation to provide guard rings.
I need to do guarding by using keep out area.
But I don't know how to keep out area I need to provide.
The resistance required shoud be in Tera Ohms

--- Updated Feb 15, 2022 ---

Negligible for many, but possibly not for all purposes. Volume and surface resistance values for PCB substrates are given in datasheets with large margin between typical and guaranteed values. You can calculate after you have defined the test geometry completely, which istn't done in your picture (no test structure length, no substrate thickness, no specification of bottom side).

You should also consider that the actual resistance depends strongly on surface contamination, relative humidity and water absorbed by the PCB. A typical situation to get unsuficient resistance is surface condensation.

Thank you very much.
May I know how to calculate the resistance(As Shown in Blue) if I know the test structure length,thickness, and spec of the bottom side.
My bottom side a GND plane

 

[ILIA KALISTRU]

Thank you....
I want that resistance to be in Tera Ohms.

Nope. Maybe GigaOhms, especially with clearence that small.. If you want to go to TOm territory, you'll likely need a slot cut between traces.