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Admin
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Everything posted by Admin
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,,,creating an epicyclod,,,
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A short backfire antenna (or short back-fire, SBA, SBF or SBFA) is a type of a directional antenna, characterized by high gain, relatively small size, and narrow band. It has a shape of a disc with a straight edge, with a vertical pillar with a dipole acting as the driven element in roughly the middle and a conductive disc at the top acting as a sub-reflector. The bottom disc has the diameter of two wavelengths, and its collar (edge) is quarter the wavelength tall. This structure behaves like a resonant cavity, resulting in a substantial gain in small space. Short backfire antennas are used in some satellites, and in high-frequency (short-wavelength) communication equipment (often for communication with satellites) on ships and other applications where rugged construction is an advantage. They are also used for wireless LANs. The SBF antenna was invented by Dr. Hermann W. Ehrenspeck of Air Force Cambridge Research Labs based at Hanscom Air Force Base in Bedford, MA and was used for among other purposes, to provide Tactical Satellite Communications for U.S. Army ground forces due to the SBF's portability and gain. The bandwidth of the antenna can be increased by using a conical main reflector instead of a flat one. The antenna proposed by me, presents an active element consisting of a patch antenna and a perpendicular butterfly antenna, both made of PCB.
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Even the best omnidirectional receiver antenna can't match a good directional for range and bounced signal rejection. This right-hand circularly polarized (RHCP) directional 5.66GHz antenna has a forward gain of ~9dBi, a beamwidth of 60 degrees and superb front to back reception ratio . It is easy to point in the general direction of the transmitter and reduces multipathing reflected signals from the rear and sides.
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A variant with polyhedral patches
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Well, then why did you make such an antenna with elliptical patches?
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Erkin,that's for you, if you're still running after butterflies,,,,,!!!
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Depending on the type of coaxial cable, the length is calculated. For the sketch that I made, the coaxial cable used has the velocity factor=0,83 rg 402 has a velocity factor=0.74
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This should be the connection with 50 ohm coaxial cable
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Simple 5,6 GHz cross-polarization dipole antenna ,,, and with parabolic bottom box as reflector,,,
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Efeksk, this is the best motor for drones?
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We see what the antenna design is slightly modified based on the experience in the manufacture of the prototype was made a specific allocation of matching elements and active elements themselves. The concept remains the same.
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Laptop connection
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Why did you put this antenna?
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An animation with the antenna to which a director has been added Impedance
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And by changing the feed point
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we'll see...!!!
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Chil, expect to do that
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That's it?,,,yes...!!! But it is best to welding directly the coaxial cable to the alimentation lines
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I do not want to buy, I want to do it myself,,,!!!!
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I found this on the internet and I would like to try to do it, what I need in the rest, much cheaper and easier to do (DIY) Please give me some indications .. !!!
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At the 85 mm diameter parabola, the focus is 33.5mm
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Of course, should be tried,,,,!!!!
