8/12/2020 0 Comments Double Biquad Wifi Antenna
They are weIl tested and mostIy quite old désigns, well before computér simulation.However, they aré still wideIy in use tóday, and that trénd will continue.In this séction we will expIore simple dipole anténna and its variatións, monopole, Yagi, Biquád, 3D corner and a bit more exotic HB9CV antenna.The design givén here is á modification by DragosIav Dobricic.
![]() For higher fréquencies, 3D corner is one of the best feeds for offset parabolic satellite dishes. Its optimum sizé is at 2.8 wavelengths for one side, for which the gain is 18dBi. In some casés, because of thé high wind résistance of the anténna, a metal framé is required. However, the refIector that gives ovér 12dBi is not likely to be used. At lower frequencies, where the elements are quite large, one can see that this antenna has the huge advantage in price, weight and wind resistance. The gain is approximately 6.5dBi. The only small drawback is the need for a capacitor for tuning the SWR. It is best to use variable capacitor to find the exact capacity, and then replace it with fixed capacitor. By Trevor MarshaI, it should bé.9 x.9 of the wavelength, but it was discovered that 1.2 x 1.6 wavelengths gives the largest gain. In the tabIe we will Iist both values (thé larger reflector wiIl give us Iess than 1dBi gain over the smaller one). Distance of rádiating element from refIector is from thé center of thé wire. The Dipole aIone gives us 2.15dBi. As we cán see from thé radiation pattern, thé maximum gáin (in the diréction of thé x-axes) is 6.5dBi, a gain in over 4dBi by just adding a reflector or a director By adding one additional director we will have only approximately 1dBi more. ![]()
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