There is some more info on the construction of biquad antennas for the 2.4 GHz band on this page. The feed line is soldered to a SMA connector on the bottom of the box. A coaxial feed line goes through the reflector and attaches to one side of the element. Center of the wire is positioned 15 mm above a circular reflector made out of steel foil with a diameter of 122 mm. The driven element is a 1.5 mm diameter copper wire bent into the figure eight shape. The antenna is made in an old CD-R cake box. Measured VSWR is slightly higher than predicted and the resonance is off by around 30 MHz, but otherwise the measurements show roughly similar results than the simulation. I've measured the S-parameters of the antenna using my home-made VNA and compared it to the simulation results produced by MMANA-GAL.
He optimized the geometry in the MMANA-GAL software. My dad recently made a biquad antenna for the 2.4 GHz band.
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