9.0m Antenna

Ku-Band 4-Port

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The antenna system consists of dual shaped Cassegrain reflectors with backup structure, a frequency reused feed assembly with corrugated horn, an elevation-over-azimuth limit motion kingpost pedestal., the hub connecting the main reflector with mount. The pedestal provides the guaranteed pointing accuracy required in C band operations.

Antenna system is characteristic of high gain, low sidelobes, low cross polarization, capable for frequency reuse both in transmit and receive bands, high driving/control accuracy  with  angle position display in high resolution.

The radiation patterns meet the associated requirements of INTELSAT IESS, and CCIR for satellites at 2 degrees spacing location in geo- stationary orbit.

Frequency Range
Tx: 13.75 - 14.5 GHz
Frequency Range
Rx: 10.95 - 12.75 GHz
Gain
Rx: 59.20 dB min.; Tx: 60.20 dB min.
Antenna Noise Temperature
50K @ 40° Elevation
Antenna Noise Temperature
87K @ 5° Elevation
Antenna Noise Temperature
65K @ 20° Elevation
Antenna Noise Temperature
73K @ 10° Elevation
Pattern Beamwidth -3dB
Rx: 0.19°; Tx: 0.16°
V S W R
Rx: 1.3:1 (LP); 1.25:1 (CP)
V S W R
Tx: 1.3:1 (LP); 1.25:1 (CP)
Sidelobe Pattern
First sidelobe level less than -14dB
Sidelobe Pattern
Beyond first sidelobe meet IESS(Intelsat) or CCIR 580-4 Recommendation
Cross Pol. Discrimination
35dB (On axis) ; 30dB (within 1 dB Beamwidth)
Axial Ratio (CP only)
Rx: 0.5: 1; Tx: 0.5
Feed Insertion Loss
Rx: 0.50 dB; Tx: 0.60 dB
Power Handling Capability
1 KW CW
Port to Port Isolation
Rx/Rx: 20 dB (CP), 30 dB (LP)
Port to Port Isolation
Tx/Rx: 85 dB
Port to Port Isolation
Tx/Tx: 20 dB (CP), 30 dB (LP)
Feed Interfaces
Rx: WR75F; Tx: WR75F
Pedestal Type
Limited Motion, El.over Az., Kingpost
Azimuth Travel
180° in two 100° in overlapping sectors continuous
Elevation Travel
0 to 90°
Polarization Travel
±90°
Reflector
Stretch-formed aluminum panel
Backup Structure
Steel
Pedestal Structure
Steel
Finish
Pedestal and Steel Structure: Hot-dipped galvanization
Finish
Reflector Surface: Aluminum panels with heat-diffusing white paint
Antenna drive mode
AC motor drive per Az, El and Pol
Operation Wind
50km/h gusts to 97km/h
Survival Wind
200km/h
Ambient Temperature
-40°C to +60°C
Rain
up to 100mm/h
Relative Humidity
up to 100%
Radial Ice (Survival)
25mm on all surface or 13mm on all surface with 130km/h wind gusts
Shock & Vibration
As encountered during shipment by commercial air, sea or truck
Corrosive atmosphere
As encountered in coastal regions and/or heavily industrialized areas
Seismic (Survival)
0.3G’s horizontal
Seismic (Survival)
0.1G’s vertical

Specific References