4.6.1 PCB Antenna

For the WBZ35 module, the PCB antenna is fabricated on the top copper layer and covered in a solder mask. The layers below the antenna do not have copper trace. It is recommended that the module be mounted on the edge of the host board and to have no PCB material below the antenna structure of the module and no copper traces or planes on the host board in that area.

The following table lists the technical specification of the PCB antenna when tested with the WBZ35 module mounted on an Evaluation Board.

Table 4-1. PCB Antenna Specification for WBZ350 Module
ParameterSpecification
Operating frequency2400 to 2500 MHz
Peak gain3.5 dBi at 2420 MHz
Efficiency65%
Table 4-2. PCB Antenna Specification for WBZ351 Module
Parameter Specification
Operating frequency 2400 to 2500 MHz
Peak gain 3.7 dBi at 2440 MHz
Efficiency 75%

PCB Antenna Radiation Pattern

The following figures illustrate the antenna radiation patterns for WBZ350 and WBZ351 modules.

Figure 4-9. WBZ350 Antenna Radiation Pattern when Phi = 0°
Figure 4-10. WBZ350 Antenna Radiation Pattern when Phi = 90°
Figure 4-11. WBZ350 Antenna Radiation Pattern when Theta = 90°
Figure 4-12. WBZ350 Antenna Radiation 3D Pattern
Figure 4-13. WBZ351 Antenna Radiation Pattern when Phi = 0°
Figure 4-14. WBZ351 Antenna Radiation Pattern when Phi = 90°
Figure 4-15. WBZ351 Antenna Radiation Pattern when Theta = 90°
Figure 4-16. WBZ351 Antenna Radiation 3D Pattern