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About Biruza

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  1. The idea of printing an antenna frame out of plastic can be taken to its logical end. She's very flexible! All antennas are very sensitive to size. It is surprising when the authors give sizes with an accuracy of 0.01. This involves tuning with an SWR meter. In life, it can be done with an accuracy of +/- 0.5 mm. And if you completely fill the space under the antenna patch with plastic? The filling can be adjusted, 10-20%, the antenna will be light, but tough. The size will be smaller. The foil is easy to stick on the work surface and cut off the excess. Now the computer is optimizing the batwing from Dr. Pepper. Directors can be placed upstairs
  2. Not immediately figured out how to edit.
  3. Why was a loft used to create a spiral? There are too many cells, 15 million mesh my computer can't digest. It's easier to use "wire from a curve". For a mathematical model, this is no difference. And yet, you can enter a step parameter into the analytical curve. To optimize the working band. For a cylinder about 6 mm, for a hemisphere about 5. These figures are obtained from the scaling of photographs. Analytical1 X(t)=r*sin(2*pi*t) Y(t)=r*cos(2*pi*t) Z(t)=s1*t t from 0 to 3 Analytical2 X(t)=r*sin(2*pi*t)*cos((t)*pi/6) Y(t)=r*cos(2*pi*t)*cos((t)*pi/6) Z(t)=s2*t+s1*3 t from 0 to 3 On sale there is a silver-plated wire for "Wire for Jewelry Making", quite hard. You only need to print the spiral holder. A flat spiral is pretty damn good, but how do you make it accurate enough?
  4. I'm learning cst studio, thanks for the example. The antennas in the drone are linearly polarized, I will lose 3 dB when circular on the controller. It will be interesting to compare with a batwing antenna, where there are no such losses.
  5. Which is better, this spiral antenna for the DJI/Mavic or the butwing antenna? After considering the answer to this question, I came to a simple conclusion: the energy of the wave in space is proportional to the volume, so the volume of the antenna matters. The wave is moving, so the cross section of the antenna also matters. It's like a butterfly net - either a large ring (antenna patch, biquadrate, butwing) or the length of the net (wave channel, yagi ..). maximum result in combination. the helical antenna is a hybrid that also polarizes. For drones, this is superfluous, so it’s probably better to put a batwing on the remote control. There is a two band batwing from Dr Pepper here on the site.
  6. In your example, the match is good, but the gain clearly does not correspond to 16 dBi and the 2.4 GHz band does not work properly. The shape of the antenna from your example is different. I compared the available projections of the spirals from DJI from photos and videos, these are really 3 + 3 turns, diameter 47 mm, pitch 6 mm. It is easy to reproduce, just thread the wire through the printed frame. But how to connect? In the Antenna Magus program, there is a variant of the hemispherical antenna array. But there is no cylindrical part. And there is no dual frequency band. Power is supplied exactly near the center. For antennas for DJI drones, the output is approximately in the middle between the edge and the center. What can be inside there? 2_by_2_Hemispherical helical array.cst
  7. I'm trying to make an analysis of a spiral antenna for drones. There is data diameter 47 mm, pitch 5 mm reflector diameter 55 mm. Matching elements are not visible. They need to be invented. Three turns on the cylinder plus three turns on the sphere. How to draw it in cst studio. In "Curves" select "Analytic Curve". The first part - three turns on the cylinder: x=23*sin(2*pi*t) y=23*cos(2*pi*t) z=5*t t from 0 to 3 The second part is three turns around the sphere: x=23*sin(2*pi*t)*cos((t-3)*pi/6) y=23*cos(2*pi*t)*cos((t-3)*pi/6) z=5*t t from 3 to 6 Let's convert the curve to a wire. What are some ideas for reconciliation? helix-helix.bmp