天线技术指标(Technical    criteria of antenna)

Item

B3

B1&L1&G1

Frequency

1268±10.23 MHz

1590±20MHz&1268±10.23MHz

Band    Width

≥20MHz

≥20MHz

Polarity

RHCP

RHCP

V.S.W.R

≤2.0

≤2.0

Axial Ratio

≤5dB

≤5dB

20°Axial Ratio

≤12dB

≤12dB

Gain

≥3dB

≥3dB

20°Gain

≥-5dB

≥-5dB

20°Non-circularity

≤5dB

Isolation

≥10dB

Impedance

50Ω

LNA(Technical criteria of LNA)

工作频率(Frequency)

1268 ±10.23MHz

1590±20MHz&1268±10.23 MHz

Gain

35±3dB

45±3dB

Flatness in    Band

≤2dB

≤2dB

Noise Figure

≤2dB

≤2dB

V.S.W.R

≤2

≤2

Output Power

≥10dBm

≥8dBm

Out of Band    Rejection

f0±100MHz，Suppression≥45dB

beyond f0±100MHz, rejection out band    over 45dB

Working Current

≤350mA

Working Voltage

+5V

Power Protection

≥30dBm，Lightning protection

lightning protection when over 30Bm

Note: Put the filter on top, in order to avoid the out-of-band clutter affecting the performance of low noise.