[mikewarot]

None of the parameters have units. Is this meters, feet, inches, wavelength? I'm sure you've done a lot of work, but it's not impedance matched to the user.

How many wavelengths diameter are required for this to work?

For example, how big would a lens have to be to work at 902-928 Mhz for LoraWAN?

[jboirazian]

Hi mikewarot,

As a general rule, Luneburg lenses need to have a diameter at least equal to the wavelength of the frequency they are designed to operate with. Because of this, Luneburg lenses are more cost-effective at higher frequencies, making them particularly suitable for applications in the GHz range.

It is possible to develop a Luneburg lens for LoRaWAN, and I am currently working on a DRC check for various wavelengths

[dbcurtis]

Ah, so my dream of a compact beam for the 1.8MHz band still eludes me... :)

[mikewarot]

You just need a mile or two of wire and a bunch of stakes with an open prarie for a rhombus antenna. ;-)

A roll of wire isn't very big ;-)