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Admin

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Everything posted by Admin

  1. You can position two patches-antennas at 90 degrees for the MiMo antenna
  2. To watch...!!! http://cheklab.ru/archives/3101
  3. So you like it?
  4. No, only the frequency range increases....!!!
  5. 300x300mm or 360x300mm
  6. And what do you want with these images for yagi antenna?
  7. Okay, and finally, tell me what you want? Something like that,,,, ,,,or like that....???
  8. It's smaller than that
  9. But I think for the LTE antenna , needs a circular or elliptical polarization...!!! You need an antenna like this....
  10. ,,, then about 800-900 MHz ... ??
  11. And of course other fractals
  12. Fractal’ term was first coined by Benoit Mandelbrot in 1983 to classify the structure whose dimensions were not whole numbers. One of the properties of fractals geometry is that it can have an infinite length while fitting in a finite volume. The radiation characteristic of any electromagnetic radiator depends on electrical length of the structure. Using the property of fractal geometry, we may increase the electrical length of an antenna, keeping the volume of antenna same. There are an infinite number of possible geometries that are available to try as a design of fractal antenna. One of the important benefits of fractal antenna is that we get more than one resonant band. The fractal concept can be used to reduce antenna size, such as the Koch dipole, Koch monopole, Koch loop, and Minkowski loop. Or, it can be used to achieve multiple bandwidth and increase bandwidth of each single band due to the self-similarity in the geometry, such as the Sierpinski dipole, Cantor slot patch, and fractal tree dipole. The Simplest example of antenna using fractal geometry is given by the Von Koch, researcher. The method of creating this shape is to repeatedly replace each line segment with the following 4 line segments. The process starts with a single line segment and continues for ever. The first few iterations of this procedure are shown in below figure. Fractal dimension contains information about the self-similarity and the space-filling properties. I design Hilbert Curves Fractal Antenna that use the co-planar wave guide feed.The first few iterations of Hilbert curves are shown below fig. This geometry is a space-Filling curve. Starting from HDTV fractal antenna I simulated this type of antenna for wifi domain
  13. Is this better? JJRC H31 Waterproof Headless Mode One Key Return 2.4G 4CH 6Axis RC Quadcopter RTF
  14. Onmi-directional UWB antennas have been developed in the last decade
  15. I will try to do it...!!!
  16. I like it, the movies from the drones are made by you ...?
  17. For fun I ordered this,on the web... Efe, tell me, did you have plans for the practical execution of a drones..??
  18. Reflector dimensions = 15x190x320mm Reflector-Patches distance = 5mm
  19. Below I present you a video made by my friend, Julungas. It is a simple explanation of how to simulate in CST Studio, a sector antenna. 00060011.avi This video can be viewed with the DivX Plus Player
  20. And a simple patches variant The patches are positioned by means of spacers of polystyrene foam
  21. ,,,create a cardioide..