SAMSUNG Proprietary-Contents may change without notice
4-2
SCH-A302
Frequency Synthesizer circuit & Spurious radiation suppression circuit
2. Spurious Radiation Suppression Circuit
The spurious signal from antenna is suppressed at the duplexer. The duplexer has a flat characteristics to
the receive signal and a high attenuation characteristics to the harmonic signal of transmission.
So it suppress the spurious radiation
Table: The characteristic of CDMA duplexer filter(F302)
T X
R X
T X to R X
PARAMETER
VALUE
Center Frequency
836.5 MHz (F
T
)
Bandwidth
F
T
± 12.5 MHz
Insertion Loss at BW
3.0 dB Max
VSWR at BW
1.8 Max
Input power
3.0 W Max
Attenuation
869 ~ 894 MHz 40 dB Min
Ripple at BW
1.6 dB Max
Center Frequency
881.5 MHz (F
R
)
Bandwidth
F
R
± 12.5 MHz
Insertion Loss at BW
4.0 dB Max
VSWR at BW
1.8 Max
Input power
1 W Max
Attenuation
824 ~ 849 MHz 56 dB Min
Ripple at BW
2.0 dB Max
Isolation
824 ~ 849 MHz 55 dB Max
869 ~ 894 MHz 49 dB Max