The MIMO/diversity antenna covers four LTE bands (LTE 1, 3, 8 and LTE 20) and four WCDMA bands (WCDMA
8, WCDMA 5, WCDMA 2 and WCDMA 1). The antenna is a dual-feed antenna supporting low bands (LB) and
high bands (HB) separately. The antenna radiators are deposited on a plastic carrier with LDS technology and
connected to the board through standard C-clips. The signal from the HB antenna is connected to a diplexer
through a 60 mm long stripline. The HB branch is then diplexed with the LB branch to the secondary receiver.
The GPS/LTE7 MIMO antenna covers GPS and LTE7 bands (RM-825). The antenna radiator is deposited on a
plastic carrier with LDS technology and connected to the board through standard C-clips. A diplexer is used
to connect the GPS/LTE7 MIMO antenna to the respective RF engines.
The NFC antenna consists of a flexi and a ferrite-sheet and is attached to the top of the B-cover with adhesive.
Connection to the main PWB is implemented by two pogo pins.
Each of the antenna assemblies is glued into the unibody.
Figure 12 Antennas on the component layout, bottom side
RM-824; RM-825; RM-826
Cellular RF troubleshooting
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Issue 2
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