This is about 31mm for the 2.4GHz 802.11b/g band. Each square edge is an exact quarter wave of the centre frequency you're interested in. ![]() The red sheet is electricians' insulating tape, used to ensure insulation between the feed points.ĭimensions are pretty exact: Tolerance is about 5% and bandwidth about 10%, though it's ~25% to unity gain. The wire is enameled copper transformer wire For a double or a quad, this is necessary, but any old wire can be used for a single biquad. I used a bolt, sanded so as to be solderable on a beer can taped to a cardboard backing, as seen here: A quad biquad (an octquad?) would be around 1 dBi higher still.Ĭonstruction is very simple. The double biquad detailed a bit lower is about 2-3 dBi higher. ![]() The gain figure on one of these things is pretty impressive, you're looking at 8-10 dBi. Lo and behold, the humble yet mighty biquad.
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