Quectel M20

M20 Hardware Design
Table 27: Product specifications of U.FL-R-SMT
Item Specification Condition
Nominal
impedance
50Ω. Temperature: -40℃ to 90℃
Frequency range DC to 6GHz.
Contact
resistance
Center: 20mΩ max.
Outer: 10mΩ max.
10mA max.
Insulation
resistance
500 MΩ min. 100V DC
VSWR 1.5 max With mated connector
Vibration No momentary disconnections of 1s;
No damage, cracks and looseness of parts
Frequency of 10 to 100 Hz,
single amplitude of 1.5 mm,
acceleration of 59m/s2, for 5
cycles in the direction of each of
the 3 axes
Shock No momentary disconnections of 1s;
No damage, cracks and looseness of parts
Acceleration of 735m/s2, 11ms
duration for 6 cycles in the
direction of each of the 3 axes
Humidity
(Steady state)
No damage, cracks or parts dislocation.
Insulation resistance 10MΩ min.(humidity
high)
Insulation resistance 500MΩ min.(dry)
96 hours at temperature of 40℃
and humidity of 95%
Temperature
cycle
No damage, cracks or parts dislocation.
Contact resistance: 25mΩ max. (Center)
15mΩ max. (Outer)
Temperature: -40℃→+5 to +35
℃→+90℃→+5 to +35℃
Time: 30min.→3min.→30min.
→3min. 5 cycles
Salt spray No excessive corrosion 5% salt water solution, 48 hours
For more information about the connector, please contact Hirose dealer or visit the Hirose home
page http://ww.hirose-connectors.com
.
4.1.2 Antenna pad
If customer connects antenna to the antenna pad via a soldered microwave coaxial cable, it is
suggested to choose the RF cable carefully to minimize the loss on it. And the recommended
insertion loss should try to meet the following requirements:
z GSM850/EGSM900<0.5dB
z DCS1800/PCS1900<1dB
Material properties of the module:
z M20 PCB: FR4
z Antenna pad: Gold plated
Soldering temperature of the antenna pad is recommended to be around 350 .℃
M20_HD_V1.01 - 63 -
Quectel