3.7 M Ka-band Antenna System with X-Y axis pedestal

1. Main introduction

With the ability of Ka-band uplink transmit, downlink receive, 3.7 M Antenna has fast acquisition of low-orbit satellites, and stable tracking for satellites.

2. Antenna system specification

2.1 Function

The tracking ability of satellites in orbit above 5 degrees in the visible arc.
The duplex capability of transmission and reception for Ka-band feed signal and left and right rotation circular polarization work simultaneously
The ability of auto-tracking for stable tracking of on-orbit targets
The function of receiving low noise amplification channel and frequency conversion
Monitor network interface and support upper monitoring operation
With standby, pointing, manual control, automatic tracking, program tracking and other working methods
With stow automatically ability
Left and right rotation polarization of tracking channel can be automatically switched
The antenna is equipped with a safety protection device to ensure human, machine and environmental safety during operation.

2.2 Mechanical Specification

Diameter: ≥3.5m
Antenna Pedestal Type: X-Y Axis Pedestal
Main Surface Accuracy: 0.3mm（RMS）。
Rotary range:

X Axis: -90°~+90°

Y Axis: -90°~+90°

2.3 Electrical Specification

Ka Operating Frequency：

Ka Tx.: 27.5GHz~30GHz

Ka Rx.: 17.7GHz~20.2GHz

Gain

Ka Tx.: ≥56.5+20lg(f/28.75GHz) dB

Ka Rx.: ≥52.8+20lg(f/18.95GHz) dB

G/T Value (El＞10°Temperature 23°C , Sunny day )

≥28.2+20lg(f/18.95GHz) dB/K

Antenna pattern envelope

First Sidelobe: -14dB

Wide-angle sidelobe (peak value of 90°）

≤29-25lgθ dBi （1°≤θ≤20°）

≤32-25lgθ dBi （20°＜θ≤48°）

VSWR: ≤1.5:1
Polarization: L&R Circular Polarization
Circular polarization axis ratio: ≤1.0dB
Port： 2 Rx. 2
Interface type

TX.: WR-34 wave guide

Rx.: WR-42 wave guide

2.4 Servo drive ability

Antenna control mode: standby, pointing, manual control, program tracking, automatic tracking, stow
X Y axis rotation speed: 0.01~5°/s。
Antenna pointing accuracy: better than 1/6 times antenna main lobe half power beamwidth.
Antenna tracking system: single channel single pulse automatic tracking.
Antenna tracking accuracy: better than 1/8 times antenna main blade half power beam width.

2.5 Environmental specification