UA91 Choke Ring Antenna

Labrosse Consulting
Quantity: 01 + -
  • Multi-constellation and Multi-fre-quency
  • Superior Antenna Phase Center
  • Excellent Polar Axis Ratio Per-formance Multipath Suppression

UA91 adopts a high-gain broadband antenna to receive GNSS signals such as GPS,  BDS,  GLONASS, Galileo, QZSS and L-Band.  The scheme of multi-stage 3D choke coils with completely symmetrical distribution is adopted to achieve higher phase center stability and excellent anti-multipath interference performance. It has excellent performance that the phase center coincides with the mechanical center

Antenna Performance
FrequencyGPS: L1/L2/L5
BDS: B1/B2/B3
QZSS: L1/L2/L5
PolarizationRight-handed circular
Axis ratio≤2dB @Axial
Antenna Gain≥ 5dBi @Axial
≥ -3dBi @Elevation angle 20
Out-of-roundness≤ 1dB @ Elevation angle 20
Front-to-back Ratio≥ 30dB
Rolloff-factor≥ 13dB
Phase Center Offset± 1.5mm
Low Noise Amplifier Performance
Frequency Range1525 ~ 1615 MHz
1182 ~ 1278 MHz
Characteristic Impedance50
VSWR≤ 1.3:1
Noise Figure1.6dB Typically @25
LNA Gain40 ± 2dB
In-band Flatness± 1.5dB
Out-of-band SuppressionL1 ± 200 MHz >40dBc
L2 ± 200 MHz >50dBc
Differential Transmission Delay≤ 5ns (L1-L2)
Antenna Transmission Delay15ns typically
Voltage3.3 - 12 VDC
Current35mA typical
Environmental performance
Operating Temperature-55℃ ~ +85℃
Storage Temperature-55℃ ~ +100℃
HumidityUp to 100%
Water/Dust ProofIP67
DimensionΦ370 mm x H263 mm
Weight7.7 Kg
Antenna InterfaceTNC-F
Radome MaterialFRP
Base MaterialAluminum-magnesium alloy