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I tried to do a simulation for this antenna and it resulted in some miniature dimensions....!!! ,,,and for the 5.8 GHz frequency...

If you solder the shield of the coaxial cable to the ground, it is not recommended.

The dielectric constant of styrofoam (expanded polystyrene) is approximately 1.02–1.04. This low value is due to its low density, which consists of air bubbles (with a dielectric constant close to 1) and the polystyrene material itself. The dielectric constant of solid polystyrene resin, without the air pockets, is higher, ranging from 2.4 to 2.6. For expanded polystyrene (styrofoam): The dielectric constant is approximately 1.02–1.04, which is a very low value due to the high volume of air in the foam. For solid polystyrene resin: The dielectric constant is higher, ranging from 2.4 to 2.6. Factors influencing the value: The dielectric constant is influenced by factors such as density, moisture, temperature, and frequency. Frequency dependence: While the dielectric constant of solid polystyrene is relatively flat up to 1 GHz, the value for the foam is measured in specific ranges, like 100-400 MHz.

This is harder to build...

After so many years I tried to recreate this antenna with the dielectric lens....

,,,2.1---2.5 GHz, is the frequency range quite good...???

,,,does this suit you...??

I don't know if this can help you.....

If I remember correctly, I tried something like this... but I'll try this square bester too, inside of beercan...

,,,there... bester.stl

Clanon, maybe you can optimize this.... bester comercial.cst

I wonder if the antenna elements have concentric copper circles on PCB...???

Yes, but it seems that many people still buy it....