The antenna is of meander type and it is integrated in the PCB layout.
The antenna is tuned to be resonant at 2.44 GHz, and the impedance is matching the 50 Ω output from the matching network. The antenna in this design is tuned for this layout only and with the same plastic casing. If the layout and/or the casing is changed, it is likely the antenna must be retuned. The antenna can be retuned by adjusting the values of C14, R17, and L4. The exact values of the components must be determined by measurements with a vector network analyzer.
Figure 1. Matching network and antenna circuit
