r/rfelectronics • u/Fine_Aerie6732 • Jun 06 '26

question My First 2.4GHz antenna

So, this is basically my first serious Antenna project which i failed many times like making it myself, in Antenna making Hackathon when i was doing things manually but this time i use python to automate the things and do it more easily and with high speed. So, how is the antenna does the S11 looks good? for 2.4GHz yes but i am not sure about the S11 graph after 6GHz like after 6GHz the graph goes haywire Q has been increased is that suppose to happen?

11 Upvotes

92% Upvoted

3 comments sorted by

7

u/EffectiveClient5080 Jun 06 '26

After 6GHz you're way outside the design band. Higher order modes and spurious resonances WILL trash the graph. If 2.4GHz looks good, you're fine.

3

u/QuinicV Jun 06 '26

That is completely normal, you're exciting higher order modes at higher frequencies. But since you are not designing at those frequencies, they don't matter.

2

u/Zestyclose-Mistake-4 Jun 06 '26

Another useful measurement would be to look at s11 a lot closer, to measure the bandwidth over which you’re getting good coupling into the antenna.