Electronics > RF, Microwave, Ham Radio

Antennas for experimentation

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Grandchuck:
These antennas are interesting and are available for $2.39 plus shipping.  Amazon USA has them listed for $9.00 (Prime).

https://www.aliexpress.us/item/2255800677446691.html?spm=a2g0o.productlist.main.7.6b5c6fc9fzQ0K9&algo_pvid=1cd35da7-2dbc-44b4-bb5a-c45ec30cd8d4&algo_exp_id=1cd35da7-2dbc-44b4-bb5a-c45ec30cd8d4-3&pdp_ext_f=%7B%22sku_id%22%3A%2210000009701039767%22%7D&pdp_npi=2%40dis%21USD%212.5%212.37%21%21%21%21%21%402122457116686255270284599d0732%2110000009701039767%21sea&curPageLogUid=IdcTy0e3axNI

The first shot is the test setup using a nanoVNA V2+4.  The next one shows both sides of  the pc board and the size.  Last, the Smith Chart and the SWR are shown.

joeqsmith:

--- Quote from: Grandchuck on November 16, 2022, 08:31:48 pm ---These antennas are interesting and are available for $2.39 plus shipping.  Amazon USA has them listed for $9.00 (Prime).
...
The first shot is the test setup using a nanoVNA V2+4.  The next one shows both sides of  the pc board and the size.  Last, the Smith Chart and the SWR are shown.

--- End quote ---

That is pretty interesting.   I'll throw my ring into the hat with one I call Child's Toy.  For completeness, also shown are the Smith Chart and SWR.   Mine also make free energy from the Ether using what I call flower power.   

joeqsmith:
Radiation pattern for Child's Toy.   While the SWR looks good it sure makes a poor radiator.   Who would have thunk. 

joeqsmith:
My two pork & bean cans made a much better radiator....

Geoff-AU:
I think the planar disc antenna is an unusual beast. 

My first attempt was here: https://thenack.com/2016/11/planar-disk-antenna/

I also made a little version from a 15x8cm protoboard (see attachments) that works above 600MHz

The pattern is like a dipole (imagine two very fat elements) at low frequencies and eventually becomes endfire-ish (imagine a bidirectional vivaldi) at high frequencies.  The lobes are a bit all over the place, so it's a matter of wiggling the antenna around to optimise the signal at the frequency you're trying for.

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