3/28/2021 0 Comments Wifi Antenna Calculator
The approximate gain of this 15 element yagi is approximately 13dBi with a good front to back ratio of 20.6dB.Beamwith is 40 horizontal and 70 vertical.
Sandpaper or file tool for removing rough edges of the elements. The above measurements are taken indoors the WiFi card is connected to a laptop. If you continue to use this site we will assume that you are happy with it. I am a math geek, computer nerd, and recovering civil servant. I have come up with a trio of web-based calculators which should help you design and build your own wire antennas - no need to buy expensive kits when the wire you need is available at the local hardware store for a fraction of the price. Just put in the frequency you want the antenna to be resonant on, choose the type of antenna youre making from the drop-down list, and whether you want to use insulated or bare wire. I would suggest adding a little bit to the length you get, as real life is never as neat as mathematics. It allows you to test the resonant frequency of the antenna for lowest SWR and zero reactance, and adjust the length to the exact frequency you want, in just one step, rather than a lengthy process of cut and try. The only problem is, what to do if you dont know the current length of your wire antenna Instead of taking it down just to measure it, you can use the Wire Antenna Length Calculator above to estimate it. ![]() ![]() It gives you the appproximate length of, for instance, 75 RG-11U coax or whatever you want to use; again, make the initial cut a bit longer than you need, and shorten it after an initial test with an antenna analyzer. The tricky part is that it needs to know your coaxs Velocity Factor. ![]() If not, I found a couple of places (see below) to look up the VF based on the coax type. If the markings have rubbed off your coax, I even found a calculator to let you get the VF of a piece of coax using an antenna analyzer.
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