mm.
•
Structure of PIFA antenna
◦
Bracket
The antenna consists of plastic bracket and metal sheet (radiator). Plastic
bracket and metal sheet are fixed by hot melt method. The plastic is made of
BS or PC material, the metal sheet is beryllium copper, phosphor copper, or
stainless steel. If you want to use FPC, add two pins in the main board, which
boasts a higher cost.
◦
Attached
Attach the metal sheet (radiator) to the back cover of the module.
•
Feed point of PIFA antenna
The feeding point must be greater than 2mm
×
3mm. Try to place it at the edge of
the PCB board, and adopt round shape. Square with rounded corners is also
preferred. The distance between feeding point pad and ground should be equal to
or greater than 1mm.
Figure 27. Pad design requirement
•
Requirements on height and area
6. Radio Frequency
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