User's Manual

H350 LGA Serials Module Hardware User Manual Page of
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7 RF Interface
7.1 Operation Frequency Band
7.1.1 Main Antenna
Operating Band Tx Rx
UMTS 2100 (Band I IMT) 1920–1980 MHz 2110–2170 MHz
UMTS 1900 (Band II IMT) 1850–1910 MHz 1930–1990 MHz
UMTS 850 (Band V IMT) 824–849 MHz 869–894 MHz
UMTS 900 (Band VIII IMT) 880–915 MHz 925–960 MHz
GSM 850 824–849 MHz 869–894 MHz
GSM 900 880–915 MHz 925–960 MHz
DCS 1800 1710–1785 MHz 1805–1880 MHz
PCS 1900 1850–1910 MHz 1930–1990 MHz
7.2 RF PCB Design
7.2.1 Layout Guideline
As H350 does not have a RF connector, so for RF line, microstrip line is recommended. The shorter the
better, insert loss is less than 0.2dB; impedance is less than 50ohm.
It is to mount H350 module and antenna connector to the same side of layout.
Add a π-type circuit (two parallel device ground pin directly to the main land) for antenna matching.
Figure 7- 1π-type Circuit
7.2.2 Impedance
The RF lines impedance should not exceed 50 ohm.