4.5 WBZ45 Module RF Considerations

The product design, environment and application significantly affect the overall performance of the system. The product designer must ensure system-level shielding (if required) and verify the performance of the product features and applications.

The following are the guidelines to consider for optimal RF performance:

• Position the WBZ45 module in a noise-free RF environment; keep it far away from high-frequency clock signals and any other sources of RF energy.
• Do not shield the antenna by any metal objects.
• The power supply must be clean and noise-free.
• Ensure that the width of the traces routed to GND, VDD rails are sufficiently large for handling peak TX current consumption.
  Note: The WBZ45 module includes RF shielding on top of the board as a standard feature.

WBZ451H RF Specifications

The 48-pin QFN LPA/MPA is combined with the external FEM design to achieve +20 dBm output power. The WBZ451H module has the matching network for doing a combined match of the LPA and MPA path along with a harmonic filter followed by an antenna-matching circuit and an antenna.