![]() ![]() Cutting the isolation of the connector helps you to get the right height when soldering the wire. A good VSWR basically means that the antenna is capable of 'absorbing' the radio waves coming from the wifi card instead of reflecting them back to the card. This is very important to tune the antenna's VSWR. The copper wire must run at a height of 1mm above the plate over a length of 30mm before following the spiral shape. You must cut this until it is 1mm above the metal plate. The BNC connector has some insulation around it's central conductor. Some very good materials are PE tubes, teflon tubes (if you can afford them) and PolyProlylene tubes. This trick works so well because the WIFI band is at 2.45GHz and microwaves also radiate at that frequency, so it's a perfect test. Now check out how warm the other material is, if it's not warmer, or a little warmer than the styrofoam, you have found suitable material, if it has melted or is very hot,that you're dealing with lossy material which absorbes microwave radiation and turns it into heat, this material is useless for making high performance antenna's. Stop the microwave immedeately if you see the other material melt. Place a piece of styrofoam in your microwave, together with a piece of the material you want to use. ![]() ![]() If you could get a pipe with roughly a 35mm diameter, you can use that IF the material is good for radiowaves. Other possible materials: I can imagine that people want to use other materials, like a pipe to mount the antenna wire on. This stuff is used in the netherlands in 220V in house cabling. A 12x12cm brass, copper or tinned metal plate, a BNC chassis connector, a BNC cable connector, 35mm thick PE or styrofoam (can also be thicker) and some 1.5mm2 single core wire. ![]()
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