RAK RAK5205, User Manual, Page: 15 / 27

15
RAK5205 User Manual V1.4
RAK
5205
4.4
GPS Antenna Parameter
Antenna specifications are listed in the table below:
Item Specifications PET
Range of Receiving Frequency 1575.42±1.1 ±2.5
Center Frequency (MHz) w/ 30mm2 GND plane 1575.42 ±3.0
Bandwidth (MHz) (Return Loss ≤ -10dB) ≥10 ±0.5
VSWR (in Center Frequency) ≤2.0 ±0.5
Gain (Zenith) (dBi Typ) w/ 70mm2 GND Plane 4.5 ±0.5
Axial Ratio (dB) w/ 70mm2 GND Plane 3.0 ±0.2
Polarization
Righ-Handed
Circular
-
Impedance (Ω) 50 -
Frequency Temparature Coefficient (ppm/ºC) 0±10 -
Table 8
| GPS Antenna Parameter
Amplifier Specifications are listed in the table below:
Item Specifications
Frequency Range 1575.42 MHz
Gain 27 dB
VSWR ≤ 2.0 V
Noise Coefficient ≤ 2.0 dBm
DC Voltage 3 ~ 5 V
DC Current 5 ± 2 mA
Table 9 | Amplifier Specifications
Environmental test performance specifications are listed below:
Item Normal Temp. High Temp. 1 Low Temp. 2
Amplifier Gain 27dB ± 2.0 27dB ± 2.0 27dB ± 2.0
VSWR ≤ 2.0 ≤ 2.0 ≤ 2.0
Noise Coefficient ≤ 2.0 ≤ 2.0 ≤ 2.0
1. High temperature test: soap in temperature (85º C) and humidity (95%) chamber for 24-hour and return to
normal temperature (at least for 1-hour) without visual shape change.
2. Low temperature test: soap in temperature (-40º C) chamber for 24-hour and return to normal
temperature (at least for 1-hour) without visual shape change.
Table 10 | Environmental Test Performance
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