A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the layout symmetrical, and use a 50-ohm microstrip transmission line for the RF signal path. Refer to NXP's application note AN11529 for more details.
Follow the recommended operating conditions, and ensure proper thermal management. Use a heat sink or thermal pad to keep the junction temperature below 125°C. Also, consider using a temperature sensor to monitor the device temperature.
The maximum allowable voltage on the VCC pin is 3.6V. Exceeding this voltage may cause permanent damage to the device. Use a voltage regulator or a voltage limiter to ensure the voltage stays within the recommended range.
Check the power supply, clock signal, and reset pin connections. Verify that the device is properly configured and initialized. Use a logic analyzer or oscilloscope to debug the digital signals. Also, check for any firmware or software issues.
Use a 50-ohm antenna with a quarter-wavelength monopole or dipole design. Place the antenna at least 10mm away from the PCB edge and 20mm away from any metal components. Refer to NXP's application note AN11529 for more details on antenna design and placement.