Renesas SmartBond UM-B-041, User Manual

Page: 128 / 170

UM-B-041
SmartBond Production Line Tool
User Manual Revision 4.8 02-Nov-2022
CFR0012 128 of 170
© 2022 Renesas Electronics
Item Description
RF cable
– Shielded box
to RF antenna
(optional).
Due to the close distance between the DUT antennas and the RF antenna cable,
cable shielding must be good, at least 60 dB. Check
Table 65 for proposals.
This cable can be optional. The RF antenna may be mounted directly onto the SMA
RF connector inside the shielded box. In that case, the fixture and the DUTs should
be placed appropriately (less than 20 cm).
RF antenna The RF antenna can be any good Wi-Fi antenna that operates at 2.5 GHz. It should
be placed in a vertical position as shown in
Figure 119 . The distance to the DUTs
should not be larger than 20 cm. It should be placed in the middle of the DUTs (in
front of DUT 8).
Bear in mind that the Anritsu MT8852B Bluetooth
®
LE tester cannot perform TX
measurements if the signal received at its antenna is less than -50 dBm. For a good
measurement, the signal reaching its antenna should be greater than -40 dBm.
Therefore, the distance and the placement between the DUTs and the RF antenna
are very important. Trial-and-error test should be carried out until the optimal
antenna position is found.
The RF antenna placement should be very stable. After the optimal position is found,
it should be fixed into position and not able to move again.
DUT fixture The fixture position should be fixed compared to the RF antenna. The fixture should
not move in any way to keep the distance between the DUTs, and the RF antenna
fixed.