Circuit design for stuff pushing into super high frequencies is god damn witchcraft. Look at that. Trying to run the math in my head for the corner frequencies.https://twitter.com/wavedrom/status/997272423798980608 …
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Basically, if you can model the geometry in your head, and superimpose the fields' path over it, you can suss out where and how geometry will create an effect in the wave as it travels through, and from there cutoff frequencies can be approximated with simple geometry.
Yeah so last time I built a cantenna I punched in the numbers into some online calculator. Seriously though, I still have no idea how you'd begin to geometrically analyze the frequency characteristics of a filter like that. My mind is utterly boggled by anything RF.
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I haven't ever done any antenna design, that shit is black magic. All my RF understanding is in devices and pcb's. If you think this shit is nuts though you'd have a lot of fun with metamaterials. An RF columnator in metamaterials looks nothing like you'd expect.
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Ultimately isn't the black magic RF PCB stuff basically antennas at that point? Well, near field I guess, not far field. I just see two disjoint helices in that cage and I think of antennas.
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