User's Manual

XT55/56 Hardware Interface Description
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XT55/56_hd_v02.06a Page 83 of 125 17.12.2004
5.3 Hirose antenna connector
XT55/56 uses two ultra-miniature SMT antenna connectors (GSM
and GPS antenna) supplied from Hirose Ltd. The product name is
U.FL-R-SMT.
The positions of both antenna connectors on the XT55/56 board
can be seen in Figure 49.
Figure 36: Mechanical dimensions of U.FL-R-SMT connector
Table 21: Product specifications of U.FL-R-SMT connector
Item Specification Conditions
Ratings
Nominal impedance
50 Ω
Rated frequency DC to 6 GHz
Operating temp: -40°C to +90°C
Operating humidity: max. 90%
Mechanical characteristics
Female contact holding
force
0.15 N min
Measured with a ∅ 0.475 pin
gauge
Repetitive operation Contact resistance:
Centre 25 mΩ
Outside 15mΩ
30 cycles of insertion and
disengagement
Vibration No momentary disconnections of
1 µs;
No damage, cracks and looseness
of parts
Frequency of 10 to 100 Hz,
single amplitude of 1.5 mm,
acceleration of 59 m/s
2
, for 5
cycles in the direction of each of
the 3 axes
Shock No momentary disconnections of
1 µs.
No damage, cracks and looseness
of parts.
Acceleration of 735 m/s
2
, 11 ms
duration for 6 cycles in the
direction of each of the 3 axes
Environmental characteristics
Humidity resistance No damage, cracks and looseness
of parts.
Insulation resistance:
100 MΩ min. at high humidity
500 MΩ min when dry
Exposure to 40°C, humidity of
95% for a total of 96 hours
Temperature cycle No damage, cracks and looseness
of parts.
Contact resistance:
Centre 25 mΩ
Outside 15mΩ
Temperature: +40°C → 5 to 35°C
→ +90°C → 5 to 35°C
Time: 30 min. → within 5 min. →
30 min. → within 5 min
Salt spray test No excessive corrosion 48 hours continuous exposure to
5% salt water