（i）dielectric antenna
center frequency 1575.42mhz±3 mhz
v.s.w.r 1.5:1
band width ±5 mhz
impedance 50 ohm
peak gain ＞3dbic based on 7×7cm ground plane
gain coverage ＞-4dbic at –90°＜0＜+90°(over 75% volume)
polarization rhcp
（ii）lna/filter
lna gain (without cable) 28db typical
noise figure 1.5db
filter out band attenuation (f0=1575.42 mhz)
7db min f0+/-20mhz ;
20db min f0+/-50mhz;
30db min f0+/-100mhz
v.s.w.r ＜2.0
dc voltage 2.7v，3.0v，3.3v，3.0v to 5.0v or other
dc current 10ma max
（iii）mechanical
weight ＜100gram
cable rg174 3meters or other
connector sma/smb/smc/bnc/fme/tnc/mcx/mmcx or other
mounting magnetic base
housing black
（iv）environmental
working temp -40℃~+85℃
storage temp. -45℃~+100℃
vibration sine sweep 1g(0-p)10~50~10hz each axis
humidity humidity95%~rh
weatherproof waterproof
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