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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