Denis Stanton G0OLX

These was tried by several groups.
Hackaday done a article in 2018 about 3 d printing microwave horns, then smoothing  the surfaces by etching with acid and then coating with metallic substance 
I believe silver worked out the best 
Denis G0OLX

On 24 Jan 2021, at 06:45, Ethan Waldo <ewaldo@...> wrote:

I've recently been made aware of substrateless ridge gap waveguide (RGW) and groove gap waveguide (GGW) after reading the publication of "Substrate-less Oscillator Module Realized by Gap Waveguide Technology for Millimeter Wave Applications" by B. Ahmadi and A. Banai  I'm curious if anyone has experience with these methods or put them in to practice.  I would imagine not having to deal with dialectric loss and capacitance or exotic substrate materials has a lot of advantages at high mmwave frequencies, though I have no idea what tools an amateur could use to model these devices since this is beyond the capabilities of QUCS.  I'm guessing accurate enough micromachining would be a challenge though low-cost albeit slow electrochemical additive manufacturing would be able to achieve the precision needed

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