The antenna is a 2 element quad. I've orientated it in the diamond configuration so it should be effective for both horizontal and vertically polarised signals. You could build the antenna in the vertical or horizontal sense if you like. The antenna was constructed on a right angled BNC connector, however I'm sure you could come up with a different sort of plug setup that would still provide good results. Just keep the lead lengths to a minimum to reduce losses. I have used an attachment that allows the BNC connector to be inserted into my Voltmeter. I switch the Voltmeter to Millivolts, point it at the 2.4Ghz RF and read the result. The yellow plastic cylinder is used to keep the antenna separation at 10mm. I cut a channel into the plastic to allow the wire to sit tight, and pushed some liquid nails into the hole to hold it. The bottom of the reflector loop is held to the BNC connector with another dollop of glue.
The detail of the antenna plugged into my Voltmeter.
Above is the antenna plugged into the Volt meter. It works pretty well, pointing it at the SUN also gets a reading! Point it at the microwave oven and it will exceed the Millivolt scale! With a little work I'm sure you could build a radar detector... I tuned the capacitor with a plasitc screwdriver to get maximum reading from a 2.4Ghz RF source. You should use a Wireless LAN card as the source.
Here is the schematic detail (not to scale), you should make the elements of the antenna as close to the correct size as possible. This will ensure maximum energy is absorbed at 2.4Ghz. The elements should be spaced around 10mm apart. The antenna will display some gain and uni-directionality, so point the smaller antenna loop (driven element) towards the RF source you wish to measure. I tried connecting the antenna directly to a microamp moving coil meter, however there was very little meter deflection from a Wireless LAN card. The electronic voltmeter is far superior.DIODE Update!
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