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Last modified: Sun, 19 Mar 2017
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Aomway Whip

This is the type of linearly polarized antenna you usually get for free with your RX or TX. It's most likely a simple dipole antenna. I wouldn't use this for FPV, but I think it's a useful reference design for comparison purposes.

VNA measurements

Image: photo-aomway-whip.jpg

Image: vna-aomway-whip.png

Matching is OK. The bandwidth is surprisingly large for this type of antenna.

Comments

Michiganbroadband

Comment #1: Fri, 30 Aug 2019, 18:40 (GMT+1, DST)

Quote

Wish I had some nice test equipment for this stuff.
I have an old thing that only goes up to 1GHz.

Have you ever pulled off the plastic radomes just to see if it changes much?
I will sometimes pop a radome itself in the microwave for a few seconds.
If it gets warm or hot it's not good material for 2.4Ghz+

Michiganbroadband

Comment #2: Fri, 30 Aug 2019, 18:54 (GMT+1, DST)

Quote

I imagine any lossy materials used in the connector or coax that change the Q may cause these to be a little broader.

And 5.8GHz do you actually see the impedance bump from the connectors?

Have you ever popped a few adapters inline to see how it changes?

Maarten Baert

Administrator

Comment #3: Wed, 11 Sep 2019, 11:25 (GMT+1, DST)

Quote

Quote: Michiganbroadband

I imagine any lossy materials used in the connector or coax that change the Q may cause these to be a little broader.

And 5.8GHz do you actually see the impedance bump from the connectors?

Have you ever popped a few adapters inline to see how it changes?

Yes the connectors definitely do have an effect, especially the cheaper ones. Typically the reflected signal changes by a few percent when adding an adapter.

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