2.5 Antenna Guidelines

To achieve the best RF performance, it is mandatory to follow the antenna recommendations as listed:

• Choose an antenna that covers the proper frequency band between 2.4 GHz to 2.5 GHz.
• Ensure that the antenna connected to the PCB pad is properly designed for 50 Ohm impedance, which is extremely important. The antenna vendor must specify the pad dimensions, the spacing from the pad to the ground reference plane, and the spacing from the edges of the pad to the ground fill on the same layer as the pad. The ground reference plane for the 50 Ohm trace going from the antenna pad to IS2083BM is probably on a different layer than the ground reference for the antenna pad. Ensure that the pad design contains a proper transition from the pad to the 50 Ohm trace.
• Ensure that the antenna matching components are placed as close to the antenna pad as possible. The antenna cannot be properly matched if the matching components are far away from the antenna.