You can rightly argue: “why make your own Wi-Fi antenna, with all these cheap ready-made antennas available”. Simply because I wanted to see how difficult it was. I also need to emphasise that this design is based on what was available and could be improved in many ways.

Before we start, note that you need to be very accurate and careful with your work in order to carry out a comparison against an available antenna, for example, of the ceramic type, or other ready-made antennas.

In order to have cables to use for the experiment, I bought 20 “IPX IPEX u.fl Female 1.13mm Connector Cable Single-head Adapter Connector 15cm IPX 1.13 Cable” (sic) from aliexpress.com (Figure 1).

2.4-GHz Wi-Fi Antenna article


When designing and building an antenna you need to know the wavelength of the signal the antenna is expected to radiate and/or pick up. The wavelength of a radio signal, λ, can be calculated with the following formula:

 

λ = c / f [m]

 

Where c is the speed of light (in m/s), and f is the...