UA91 Choke Ring Antenna
UA91 Choke Ring Antenna
UA91 Choke Ring Antenna
UA91 Choke Ring Antenna
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UA91 Choke Ring Antenna

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  • Multi-constellation and Multi-fre-quency
  • Superior Antenna Phase Center
  • Excellent Polar Axis Ratio Per-formance Multipath Suppression

UA91 adopts 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 perfor-mance. It has excellent performance that the phase center coincides with the mechanical center

 Antenna Performance 
Frequency GPS: L1/L2/L5
BDS: B1/B2/B3
GLONASS: G1/G2/G3
GALILEO: E1/E2/E5/E6C
QZSS: L1/L2/L5
SBAS
L-Band
Polarization  Right-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 Range  1525 ~ 1615 MHz
1182 ~ 1278 MHz
Characteristic
Impedance
50 
VSWR  ≤ 1.3:1
Noise Figure  1.6dB Typically @25
LNA Gain  40 ± 2dB 
In-band Flatness  ± 1.5dB 
Out-of-band
Suppression
L1 ± 200 MHz >40dBc
L2 ± 200 MHz >50dBc
Differential Transmission
Delay
≤ 5ns (L1-L2) 
Antenna Transmission
Delay
15ns typically 
Voltage  3.3 - 12 VDC 
Current  35mA typical 
Environmental performance 
Operating Temperature  -55℃ ~ +85℃ 
Storage Temperature  -55℃ ~ +100℃ 
Humidity  Up to 100% 
Water/Dust Proof  IP67 
Physical 
Dimension Φ370 mm x H263 mm 
Weight  7.7 Kg 
Antenna Interface  TNC-F 
Radome Material  FRP
Base Material Aluminum-magnesium alloy 
Mount  5/8-11UNC-2B