UMTS/HSPA Module Series
UG96 Hardware Design
UG96_Hardware_Design 49 / 76
UMTS2100
2110~2170
1920~1980
MHz
UMTS1900
1930~1990
1850~1910
MHz
UMTS900
925~960
880~915
MHz
UMTS850
869~894
824~849
MHz
UMTS800
875~885
830~840
MHz
4.1.3. Reference Design of RF Antenna Interface
A reference design of RF antenna interface
is recommended as below.
A
π-type matching circuit should
be reserved for better RF performance, and the
π-type
matching components (R1/C1/C2) should be
placed as close to the antenna as possible
. The capacitors are not mounted by default.
RF_ANT
R1 0R
C1
NM
C2
NM
Module
Figure 32: Reference Circuit of RF Antenna Interface
UG96 provides an RF antenna pad for customers
’ antenna connection. The RF trace in host PCB
connected to the module
’s RF antenna pad should be micro-strip line or other types of RF traces, whose
characteristic impendence should be close to 50
Ω. UG96 comes with grounding pads which are next to
the antenna pad in order to give a better grounding.
4.1.4. Reference Design of RF Layout
For user’s PCB, the characteristic impedance of all RF traces should be controlled as 50Ω. The
impedance of the RF tra
ces is usually determined by the trace width (W), the materials’ dielectric constant,
the distance between signal layer and reference ground (H), and the clearance between RF trace and
ground (S). Microstrip line or coplanar waveguide line is typically used in RF layout for characteristic
impedance control. The following are reference designs of microstrip line or coplanar waveguide line with
different PCB structures
