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5-2
STH-N271
Frequency Synthesizer Circuit and Spurious Radiation Suppression Circuit
2. Spurious Radiation Suppression Circuit
The spurious signal from antenna is suppressed at the duplexer. The duplexer has flat characteristics to the
receiving signal and high attenuation characteristics to the harmonic signals of transmission. Therefore, it
suppresses the spurious radiation
Item
TX-ANT
RX-ANT
Center Freq.
836.5 MHz
881.5 MHz
Bandwidth (BW)
± 12.5 MHz
± 12.5 MHz
Insertion Loss
2.8 dB Max at 25C
4 dB Max
3 dB Max at -30 ~ +85C
Ripple at BW
1.6 dB Max
2.0 dB Max
VSWR
1.8 Min
1.8 Min
Attenuation
43 dB Min at 869 ~ 894 MHz
56 dB Min at 824 ~ 849 MHz
Input Power
3 W Max
1 W Max
In/Out Impedance
50 Ohms
50 Ohms
Mechanical Size
15.65 (L) X 9.2 (W) X 3.3 (H) mm