Grupa: Administrator 
Lokalizacja:: Kłodzko JO80IK
Posty: 39535 #7921175
Od: 2013-10-18
Ilość edycji wpisu: 1 | Machining 53dBi antennas for 122 GHz mmWave Radar chips!
TYLKO ZAREJESTROWANI I ZALOGOWANI UŻYTKOWNICY WIDZĄ LINKI » DARMOWA REJESTRACJA
Źródło: Machining and Microwaves
Machining waveguide combiner cavities for 122 GHz ISM Radar chips on my lathe and mill, to feed extremely high-gain antennas in the race for National and World Record distances for two-way mmWave communications.
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These radar chips have a normal working range around 100 metres with external lenses. Radio experimenters have already pushed these devices to over SIXTY KILOMETRES using large antennas, so the challenge is on!
This episode reveals the mysterious inner workings of the interface between the miniscule full-duplex embedded radar antennas integrated directly into the substrate of the SiliconRadar chips, and the tuneable microwave cavity which launches the signal into the 2 mm circular waveguide and feedhorn. This will be mounted at one hyperbolic focus of a Cassegrain parabola/hyperbola antenna system with immense power gain.
Parts of this video are, as usual, very, VERY silly. Lots more episodes to follow as we stumble along the path to discovery and enlightenment, impeded, er sorry "assisted" by AIMEE, Neil's irritable (A)rtificial (I)ntelligence (M)achining (E)xpert (E)ngineering System and all-round nemesis.
This whole project is about having some hugely niche and geeky fun, pushing the limits of the Laws of Physics and playing with machining, 3D printing, CNC, EM simulations, CAD and all the other two and three letter initialisms that are the gateway to jolly times messing about with radios and machines.
This is the sort of thing that radio hams are getting up to these days, it's not all preppers, walkie-talkies, 599 TU and FT8 down here in the nether-regions of experimental radio hackery.
John G8ACE has a short vid at https://www.youtube.com/watch?v=_hAaY... using some of the 122 GHz gear in Hellschreiber mode. Waterfall graffiti!
Important notes:
This is not intended to be educational, so don't copy what I do, or believe what I say. Unless I'm right, obviously.
I have a licence to use these things, as in the UK, we have Laws about that sort of stuff.
It's easy enough to get a licence, and there are brilliant on-line courses and exams these days in many countries to get a ham licence. Andrew Anderson and Tim Tuck did a stunning job in getting these pretty niche boards built and distributed. I'm doing a niche bit of engineering within that tiny niche in an attempt to get a few more decibels of system performance. Other great solutions for 122 GHz are available, but Andrew and Tim really hit the spot with this one in terms of dropping the barrier to entry, so HUGE props to them and the other teams who've come up with viable solution for this frequency band so we can all have a pile of fun.
Unimportant note:
AIMEE's face was generated by an algorithm in a Generative Adversarial Network.
Her voice is generated by Google TTS, using "Google UK Female"
She does not exist.
TYLKO ZAREJESTROWANI I ZALOGOWANI UŻYTKOWNICY WIDZĄ LINKI » DARMOWA REJESTRACJA
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Life above 50,000 MHz
73! Stanisław Kłodzko JO80IK
IC-7300 + IC-9700 + (2m - 9el + 250W),
(70cm - 21 el + 250W), (23cm - 55 el + 150W)
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