Product Instructions

ETOR_2019/02/14
9. Module placement guide
The ESP-8285 module can be soldered to the PCB backplane. For optimum
RF performance of the end product, please note that the placement of the
module on the backplane is designed in a reasonable manner in accordance
with this guide. The module uses 2.4 GWi-F
The arrangement of the antenna outside the board frame or along the
board edge and hollowed out below (at least 5.0 mm from both sides of the
PCB antenna to both sides of the base plate) has little effect on the RF
performance, which is comparable to the RF performance of the module tested
separately.
If the design is limited, the PCB antenna must be placed on the
backplane. Place the antenna along the edge of the board and hollowed out
or uncopper it. This way the RF performance will be somewhat impaired.
If the antenna is placed in the backplane, the radio frequency signal can
not be well radiated and received.
For details of several common placement schemes of the module, please
refer to the scheme diagram below. After rigorous RF analysis, the RF
performance of various placement schemes in the scheme diagram is analyzed
as follows:
1. The RF performance of scenarios 1, 2, and 3 is close. That is, the
arrangement of the antenna outside the board frame, or the antenna along
the board edge and hollowed out below (at least 5.0 mm from both sides of
the PCB antenna to both sides of the base plate) has no significant impact
on the RF performance, which is equivalent to the RF performance of the
module tested separately.
2. If the design is limited and the PCB antenna must be placed on the
backplane, refer to the arrangement in Scheme 4, where the antenna is
placed along the edge of the board without copper underneath, which results
in some loss of RF performance. Alternatively, the arrangement of scheme 5
may be adopted, and the antenna portion may be separated by an opening in
the middle of the plate, but scheme 5 is not recommended if scheme 1-4 may
be adopted.
3. Option 6 has the worst RF performance. Because the antenna is placed in the
backplane, the radio frequency signal can not be radiated and received well.