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Harry36

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About Harry36

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  1. You don't have sidelobes on the x-axis and quite large on the y-axis. Try resizing the reflector ;-) , this should help flatten the radiation pattern and raise the gain.You don't have X-axis sidelobes and quite large Y-axis ones. Try resizing the reflector ;-) , this should help flatten the radiation pattern and raise the gain (energy from the sidelobes will go into the main direction). The antenna is symmetrical and requires a Balun to connect the coaxial cable. It seems to me that this has nothing to do with the loop antenna (Kharchenko's bi-square), this one can be considered as a broadband dipole with a shunt or as a slot. One of the simplest options for a balun is to lay a cable along the slot to the zero potential point (connecting the two halves of the emitter sheet) and leading it to the side of the reflector. But this option requires a relatively small diameter cable, preferably with a TEFLON dielectric and an SMA flange crimped on it. Not everyone has such a cable. it seemed to me that at home it is easier to make the balun suggested by me on the previous page. You can multiply the dimensions in the project by 2.5 - 3 and get the dimensions for the range 1.7-2.7 If you adjust the dimensions, then the structure fits into the perimeter of a metal can with a diameter of 99 mm. This is a very simple and quick solution for home-made from scrap materials.
  2. This antenna can be used in a wider range without visible loss. It can be done much easier. please display the SWR graph from 1. It cannot be less than 1 (apparently CST does not know this), this complicates the reading of the graph. To increase the gain, you can use the director system. Read the topic
  3. BiQuad + Balun 5150-6450 (wi-fi 5+6+7) biquad_5065.cst
  4. directivity ~ 17 on 6000
  5. biquad 4500(Russian 5G)-6000 t=0.2mm h=12.5 reflector = 56x56 mm connector - SMA
  6. https://iopscience.iop.org/article/10.1088/1367-2630/14/3/033001
  7. I figured out what's wrong When the reflector was added to my project, it was not coaxial to the stern and the offset angle was not observed. Because of this, the deviation on the first port is almost zero.
  8. Due to the deviation of the phase center of the antenna from the focus of the mirror, the direct direction of the beam from the mirror deviated. All 4 beams will eventually be directed in different directions. It's not good at all. it is not intended for feed.
  9. original - https://ypylypenko.livejournal.com/35552.html boom 20*20 mm dipol dia=8 mm directors and reflectors dia=6 mm cst2021 YUBeta19.cst