[SOLVED] Air dielectric strength for high power patch antenna

Andrew77 · Mar 30, 2025

Hi,
I'm developing an high power 150W collinear patch antenna for 2,4 Ghz made of 1mm thick patches on air separated by 5mm gap. Between patches @2.5 mm I put probes and simulated: these are the results: more than 30KV/m ! There could be corona effect, considering air strength of 50V/m every mils (for 5mm should be 10000V/m)??
Many thanks

mtwieg · Mar 30, 2025

Typical dielectric strength of air is 3000kV/m, not 30KV/m. You should be fine.

Andrew77 · Mar 30, 2025

mtwieg said:
Typical dielectric strength of air is 3000kV/m

Thanks for replay, I've read that air is from 30 to 70 V/mils (50V every 0,0254mm) https://www.rfcafe.com/references/electrical/dielectric-constants-strengths.htm

mtwieg · Mar 31, 2025

Andrew77 said:
Thanks for replay, I've read that air is from 30 to 70 V/mils (50V every 0,0254mm) https://www.rfcafe.com/references/electrical/dielectric-constants-strengths.htm

30V/mil is equivalent to 2000kV/m. So your measured field of 30kV/m should be fine.

Or did you measure 30kV per mil instead of 30kV per meter?

[SOLVED] Air dielectric strength for high power patch antenna

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[SOLVED] Air dielectric strength for high power patch antenna

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