For any Wi-Fi product, the antenna placement affects the performance of the whole system. The antenna requires free space to radiate RF signals, and it must not be surrounded by the ground plane. Thus, for best PCB antenna performance, the RNWF11PC module must be placed at the edge of the host board.
The RNWF11PC Module ground outline edge must be aligned with the edge of the host board ground plane (see the following figure).
A low-impedance ground plane for the RNWF11 Module ensures the best radio performance (best range and lowest noise). The ground plane can be extended beyond the minimum recommendation as required for the host board Electromagnetic Compatibility (EMC) and noise reduction.
For best performance, keep metal structures and components (such as mechanical spacers, bump on and so on) at least 31.75 mm away from the PCB trace antenna (see the following figure).
The antenna on the RNWF11 Module must not be placed in direct contact with or close proximity to plastic casing or objects. Keep a minimum clearance of 10 mm in all directions around the PCB antenna. The following figure illustrates the module placement.Figure 2-6. RNWF11PC Module Placement (Top View)
The module must be flush mounted to the host board. The following figure illustrates the mounting guidelines recommendation.Figure 2-7. RNWF11 Mounting Guidelines Recommendation (Side View)
The following figure illustrates examples of the RNWF11PC Module placement on a host board with a ground plane. For placement-specific guidance, see Figure 2-6.Figure 2-8. Examples of the RNWF11PC Module Placements on the Host Board
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