User's Manual
HiLo3G-850 User Manual
04 March 2011 - Page 29 / 36
circuits.
6.1 Antenna Connection
HiLo3G-850 provides two methods to connect an antenna, one is spring contact and the other is UFL RF connector.
Definition of the reference antenna connector:
• Strictly 50 Ohms matched impedance PCB tracks
• Straight PCB tracks
Antenna gain:
• Radiation pattern: depending on antenna position and size of the device
• Gain averaged in space in all frequencies: > -3dBi
• Maximum VSWR: < 1.5:1 with 50 Ohms reference impedance
In order to get the best sensitivity and output power, it is recommended to implement a matching circuit between the
module and the antenna:
Figure 29: Antenna connection reference
6.1.1 Antenna Connector
A 50-Ohm RF connector on the HiLo3G-850 PCB is available for antenna (RF cable) connection.
Reference
HIROSE U.FL-R-SMT-1 (10)
6.1.2 Spring Contact
50 Ω line matching
Recommends to solder the spring contact on the whole surface instead of only 2 points
Figure 30: Spring contact
6.1.3 Antenna Notice
Antenna for HiLo3G-850 should be resonated in the operating bands (GSM 850, 900, 1800, 1900 + UMTS band 1, 2, 5)
depending on HiLo3G-850 reference.
Pay attention to the RF-impedance of the HiLo3G-850 (50Ω)