With 13dB of gain and a big 120 degree beamwidth, this could be one of your best homemade WIFi antenna. It also has a strong front / rear insolation.
Bluetooth uses 2400MHz to 2483.5MHz. I decided to build this antenna for a great friend of mine who needed a bit more range from his new electric blue Microsoft bluetooth wireless mouse. Here is how.
This sector antenna was made from a piece of thick copper wire formed into a "bowtie" shape (the biquad - with sides 32 millimetres) and soldered to a round N-type connector. The N connector was then screwed into a steel disc about the size of a CD.
This modification is in two parts, case disassembly and the details on the PCB modification. You might also want to take a look at the modification to an SMC2632 since it is pretty much identical.
How to reverse the components so that you end up with an RP-TNC plug and an RP-TNC jack and the best bit is that minimal tools are required and about 30 minutes of time.
My design goals were to be lightweight, durable, reasonably easy to make and of course work effectively. I decided to over engineer a solution and this is what I came up with. First, I built a frame out of mild steel welding rods, these were gas welded to produce the basic antenna shape.
Here is a sector antenna you can build for Wi-Fi 2.4GHz ISM band. This antenna is suitable for use in Computer Radio LANs conforming to the IEEE 802.11b/g standard – better known as Wi-Fi. It can be used on an Access Point (or wireless Router) or Wifi client with equal benefits.
The Conifer antennas used by Galaxy were designed to operate at a different frequency than wireless networking, and have a down-convertor integrated in the feedhorn. They need to be modified before they can be used for 802.11b wireless networking, and this page describes one way to modify them, achieving very good results.
How to design and build helix antennas is described here. Also some of the theory behind it. There are tree radiation modes of helical antennas. The most used mode is the axial mode, it provides maximum radiation along the helix axis.
The waveguide that feeds the horn is the bottom of a Tetra Brik. The horn is made of cardboard covered inside with kitchen aluminium foil. Four pieces of cardboard covered with aluminium foil make the horn.