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5.3 Antenna Design
The RF I/O Antenna signal is by default provided to 50 ohm antenna interface. In user's main
board, the Antenna layout should be design 50 ohm Microstrip Transmission Line.
The Microstrip Transmission Line is better handled by PCB vendor. We also provide a sample
50 ohm unbalanced transmission system.
The PCB parameters that affect impedance:
Track width (W)
PCB substrate thickness (H)
PCB substrate permittivity (εr)
To a lesser extent, PCB copper thickness (T) and proximity of same layer ground plane.
Antenna characteristics are essential for good functionality of the module. The radiating
performance of antennas has direct impact on the reliability of connection over the Air Interface. Bad
termination of the antenna can result in poor performance of the module.
G610 GPRS Module Hardware User Manual
Page 42 of 47
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