User's Manual

XT55/56 Hardware Interface Description
Confidential / Released
s
XT55/56_hd_v02.06a Page 81 of 125 17.12.2004
Module
A
ntenna o
r
measuremen
t
equipmen
t
50Ohm
50Ohm
U.FL
PAD
Z
Module
Antenna or
measurement
equipment
50Ohm
50Ohm
U.FL
Z
PAD
The U.FL-R-SMT connector has been chosen as antenna reference point (ARP) for the
Siemens reference equipment submitted to type approve XT55/56. All RF data specified
throughout this manual are related to the ARP. For compliance with the test results of the
Siemens type approval you are advised to give priority to the connector, rather than using the
antenna pad.
IMPORTANT: Both solutions can only be applied alternatively. This means, whenever an
antenna is plugged to the Hirose connector, the pad must not be used. Vice versa, if the
antenna is connected to the pad, then the Hirose connector must be left empty.
Antenna connected to Hirose connector: Antenna connected to pad:
Figure 33: Never use antenna connector and antenna pad at the same time
No matter which option you choose, ensure that the antenna pad does not come into contact
with the holding device or any other components of the host application. It needs to be
surrounded by a restricted area filled with air, which must also be reserved 0.8 mm in height.
PCB
U.FL antenna connector
RF section
A
ntenna pad
Restricted area
Figure 34: Restricted area around antenna pad