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Dr. Pepper

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About Dr. Pepper

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  1. When you are so interested in different designs perhaps its good for you to try cst microwave studio and test your own designs. Not every small change can be tested by our Admin ;-)
  2. I think you don't need a mimo configuration. A simple P2P connection is enough to send a few signals to your equipment. When a cantenna is to big, then perhaps a batwing with simple reflector or a slot dipol (Sputnik) should be the way to go. Another possibility would be a simple biquad. All these can be relatively small and fits in a small plastic container. You then only need two network adapters like the alpha card and attach a good antenna on both. One is a hotspot like on your computer one is connected to this from the telescope. When you can etch pcb's you could also try a pcb biquad. Should be the easiest task to do then. I think 9db gain should be plenty for your application when used on both sides.
  3. If you only want a connection 600m away on a field you could also simply use 2 Cantennas. I made a fast and stable connection with 2 Cantennas over 7 Km without any problem, but there was nothing in between otherwise such ranges are near to not possible.
  4. The angle of the box is very important. It influences not only the gain but also swr, bandwith and so on.
  5. The slot dipole with V cut outs like an batwing antenna, not as good for broadband application but a little more compact than the slot dipole and a good gainer. Here an example for a wifi antenna slot antenna with V 24-25.cst
  6. Wow that works like charm, thank you.
  7. You are a real master
  8. then its necessary to analyze the structure and look which parameter is related to lamda and which is perhaps related to other factors. And yes you have to find a center frequency. For a single band antenna this is easy for such a multiband its much trial and error i think. For me its easier to re-optimize the design for another frequency range. For lower frequency's there should be better designs that are not so big, the only other range i can imagine is in the 5GHz region but there you not need such a wide bandwith. Attached you will find the cst file, feel free to recalculate it for another freq. range or to find the lambda depending parameters ;-) slot antenna 17-27-reflectors.cst
  9. And additional a variant with directors. They harmonize good with the design but they give only a slight improvement.
  10. An improved version of the slot dipole with wings. Good broadband behavior and good gain. 1.7 - 2.7 GHz with SWR <1.3, Gain from 2.1 - 2.5 GHz > 13 dBi
  11. Another Option?:
  12. Here you find the size without the horn:
  13. Yes this was the picture i have in mind. Thanks for the hint
  14. Harry36 provided a slot dipole as an antenna for drones: I designed a similar antenna for 1.7 to 2.7 GHz which gives a good gain and low swr over the communication band. Somewhere here or on Lan23 i see a picture of something similar with slots at the end so i also used them. For everyone who wants to recalculate such an antenna you will find the cst file below. I think for its simplicity it performs very well. Size: CST slot antenna max band.cst
  15. I made a Batwing with directors and the swr is quite good. I have to make an mount for a tripod than i will compare it to some antennas but not today ;-). The result is a little bit different to the calculation but everything is made by hand so not 100% correct. In the middle of the wifi band the swr is at 1.1 to 1.15 depending where the antenna is pointed to. Its interesting that the antenna is still usable from 1.9 to 2.9 GHz so if the range from 1.7 to 2.7 GHz is needed it could be recalculated for 2.2 GHz and would still have a good gain. As i mentioned before i used Aluminium tubes for the directors which works quite well and printed the holder with PETG. The rest is also Aluminium sheet (0.5mm) cut with a wallpaper knife for clean cuts and soldered on with the help of copper tape.