9.2 Meter Ka-Band Antenna

Large diameter Ka-band antennas require unique design criteria which General Dynamics SATCOM Technologies has successfully demonstrated with both the 9.2 and 13.2 meter products. Items such as reflector surface accuracy, antenna/feed design, structural antenna stiffness and integrity, thermal effects, anti-icing, HPA phase combining, monopulse tracking, installation and alignments and hub integration all require special engineering expertise at Ka-band. SATCOM Technologies has proven our expertise in the above areas and has earned the position as a preferred antenna system provider and integrator to a number of major satellite broadcasting companies by providing in excess of fifty systems of this type over the past five years alone.

Applications

  • TT&C
  • IOT
  • Broadband Gateways
  • High Power Uplinks

Features

  • Precision Ka-band rated surface reflector with counterweights
  • High stiffness turntable bearing
  • DC motor jackscrew drive in elevation
  • Dual DC motor gear-pinion drive with mechanical anti-backlash in azimuth
  • Access stairway and large work platform for ease of maintenance
  • 9.2 foot diameter hub with five foot roll up access door
  • Housing for up to eight high power amplifiers (HPA’s)
  • HPA mounting via slide mounts and a mechanical de-weighting mechanism allows for easy maintenance and replacement
  • Up and down converter integration providing a wideband L-band interface
  • Easily accessible test and monitor points
  • Strategically placed handles and storage to allow easy and safe access to hub
  • Phase/power combined HPA design capability
  • Power meter sensing of TX power capability
  • Transmit signal block downconverters to allow spectrum monitoring at L-band in the control building.
  • Complete M&C capability for monitoring and control of all hub components.
  • Hub and antenna mounted electrical outlets and lighting
  • Lightning protection
  • Temperature monitoring
  • Redundant two channel monopulse tracking system
  • Redundant HVAC systems for hub and pedestal

Specifications

Performance Parameters Ka-Band
Reflector
9.2 meter, counterweight
Optics Configuration Cassegrain
Frequency
- Transmit
- Receive
Standard Band
28.35-30.00 GHz
18.30-20.20 GHz
Custom Band
27.50-31.00 GHz
17.70-21.20 GHz
Antenna Gain (Standard Band)
Transmit @ Feed Tx Port Input    Receive @ LNA Input

66.1+20Log(F/30.0) dBi
63.2+20Log(F/20.2) dBi

G/T (min) @ 30° Elevation and 120K LNA (Standard Band)

39.2 + 20 Log (F/20.2) dBi/K (includes Feed to LNA losses for 1:2 LNA Redundancy)
Polarization (Transmit and Receive)  Dual Circular (RHCP/LHCP)
3 dB Beamwidth
Transmit
Receive
0.08°
0.12°
Axial Ratio @ 1dB BW (X-POL Isolation in dB) 0.5 dB (30.7 dB)
Port to Port Isolation
Transmit to Receive
Receive to Transmit
Transmit to Transmit
Receive to Recieve

85 dB
85 dB
20 dB
20 dB
VSWR 1.35:1 Max
Sidelobe Performance (Tx/Rx) ITU-RS.580-5
FCC CFR-47 & 25.209
 Power Handling  1 kW CW Per Port, 2 kW Total
 Feed Waveguide Flange  Rx (WR-42), Tx (WR-34)
 Pressurization
Operational
Maximum
 0.5 psi
2.0 psi
 Elevation Travel  0 to 90° Continuous
 Azimuth Travel  ±90° Continuous
 Axis Velocity  0.5°/s
 Axis Acceleration  0.2°/s2
 Azimuth Drive Configuration  Gear and Pinion, Single Motor Drive
 Elevation Drive Configuration  Jackscrew, Single Motor Drive
 Motor Type for Azimuth and Elevation  Servo Motor
 Antenna Two-Axis Pointing Performance
(over 10 degree of axis travel)
 0.0066° RMS, No Wind
0.0140° RMS Winds 30 mph gusting to 45 mph
 Tracking Performance for Optrack
(C/No: 45 dB-Hz)
 0.0041° RMS, No Wind
0.0084° RMS Winds 45 mph gusting to 60 mph
 Tracking Performance for Monopulse
(C/No: 45 dB-Hz)
 0.0041° RMS, No Wind
0.0047° RMS Winds 45 mph gusting to 60 mph
 Tracking Modes  Program Track
Optrack /Step Track
Monopulse
 Anti-Icing  Feed Blower
Heated Subreflector
Optional Primary Reflector – Gas or Electric (as required)
  • Features

    Applications

    • TT&C
    • IOT
    • Broadband Gateways
    • High Power Uplinks

    Features

    • Precision Ka-band rated surface reflector with counterweights
    • High stiffness turntable bearing
    • DC motor jackscrew drive in elevation
    • Dual DC motor gear-pinion drive with mechanical anti-backlash in azimuth
    • Access stairway and large work platform for ease of maintenance
    • 9.2 foot diameter hub with five foot roll up access door
    • Housing for up to eight high power amplifiers (HPA’s)
    • HPA mounting via slide mounts and a mechanical de-weighting mechanism allows for easy maintenance and replacement
    • Up and down converter integration providing a wideband L-band interface
    • Easily accessible test and monitor points
    • Strategically placed handles and storage to allow easy and safe access to hub
    • Phase/power combined HPA design capability
    • Power meter sensing of TX power capability
    • Transmit signal block downconverters to allow spectrum monitoring at L-band in the control building.
    • Complete M&C capability for monitoring and control of all hub components.
    • Hub and antenna mounted electrical outlets and lighting
    • Lightning protection
    • Temperature monitoring
    • Redundant two channel monopulse tracking system
    • Redundant HVAC systems for hub and pedestal
  • Specifications

    Specifications

    Performance Parameters Ka-Band
    Reflector
    9.2 meter, counterweight
    Optics Configuration Cassegrain
    Frequency
    - Transmit
    - Receive
    Standard Band
    28.35-30.00 GHz
    18.30-20.20 GHz
    Custom Band
    27.50-31.00 GHz
    17.70-21.20 GHz
    Antenna Gain (Standard Band)
    Transmit @ Feed Tx Port Input    Receive @ LNA Input

    66.1+20Log(F/30.0) dBi
    63.2+20Log(F/20.2) dBi

    G/T (min) @ 30° Elevation and 120K LNA (Standard Band)

    39.2 + 20 Log (F/20.2) dBi/K (includes Feed to LNA losses for 1:2 LNA Redundancy)
    Polarization (Transmit and Receive)  Dual Circular (RHCP/LHCP)
    3 dB Beamwidth
    Transmit
    Receive
    0.08°
    0.12°
    Axial Ratio @ 1dB BW (X-POL Isolation in dB) 0.5 dB (30.7 dB)
    Port to Port Isolation
    Transmit to Receive
    Receive to Transmit
    Transmit to Transmit
    Receive to Recieve

    85 dB
    85 dB
    20 dB
    20 dB
    VSWR 1.35:1 Max
    Sidelobe Performance (Tx/Rx) ITU-RS.580-5
    FCC CFR-47 & 25.209
     Power Handling  1 kW CW Per Port, 2 kW Total
     Feed Waveguide Flange  Rx (WR-42), Tx (WR-34)
     Pressurization
    Operational
    Maximum
     0.5 psi
    2.0 psi
     Elevation Travel  0 to 90° Continuous
     Azimuth Travel  ±90° Continuous
     Axis Velocity  0.5°/s
     Axis Acceleration  0.2°/s2
     Azimuth Drive Configuration  Gear and Pinion, Single Motor Drive
     Elevation Drive Configuration  Jackscrew, Single Motor Drive
     Motor Type for Azimuth and Elevation  Servo Motor
     Antenna Two-Axis Pointing Performance
    (over 10 degree of axis travel)
     0.0066° RMS, No Wind
    0.0140° RMS Winds 30 mph gusting to 45 mph
     Tracking Performance for Optrack
    (C/No: 45 dB-Hz)
     0.0041° RMS, No Wind
    0.0084° RMS Winds 45 mph gusting to 60 mph
     Tracking Performance for Monopulse
    (C/No: 45 dB-Hz)
     0.0041° RMS, No Wind
    0.0047° RMS Winds 45 mph gusting to 60 mph
     Tracking Modes  Program Track
    Optrack /Step Track
    Monopulse
     Anti-Icing  Feed Blower
    Heated Subreflector
    Optional Primary Reflector – Gas or Electric (as required)
  • Literature

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