Show HN: Open-Source Software for Designing 3D-Printable Luneburg Lenses for RF

Re:Show HN: Open-Source Software for Designing 3D-Printable ... by mikewarot on Monday September 02, 2024 @12:29PM (#41426762)

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?

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Re:Show HN: Open-Source Software for Designing 3D-Printable ... by jboirazian on Monday September 02, 2024 @12:42PM (#41426860)

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

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Re:Show HN: Open-Source Software for Designing 3D-Printable ... by dbcurtis on Monday September 02, 2024 @02:21PM (#41427646)

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

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Re:Show HN: Open-Source Software for Designing 3D-Printable ... by mikewarot on Monday September 02, 2024 @04:30PM (#41428555)

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 ;-)

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