3.7m S band Rx/Tx antenna for GEO satellite

Frequency

2200-2300MHz

2025-2120MHz

Gain, dBi

≥35.6+20lg(F/F0)dBi(F0=2200MHz)

≥34.88+20lg(F/F0)dBi(F0=2025MHz)

Polarization

Circular

VSWR

                                          1.4:1

                               1.4:1

Axial ratio 2 port

                                         ≤1dB

            ≤1dB

Feed insertion loss

                                         ≤0.3dB

              ≤0.3dB

Power capacity

                                              /

              2KW

Feed interface

                                          N-50K

               N-50K

Isolation, Rx to Tx,

≥18 dB(Without filter)

First Sidelobe 

≤-14dB

Far sidelobe

                 29 - 25 logθ(1°≤θ＜20°)

MECHANICAL SPECIFICATIONS

Antenna Diameter

3.7m

Antenna travel range

AZ                                        

                                             5°~355° continuous

EL

                                                5°~90°

Pol

                                                  ±90°

Antenna Type

Turntable(AZ: dual motors, EL: leadscrew)

Structure

LMC/FMC

Antenna description

Main reflector includes 12 pieces segmented panels, antenna overall weight is around 1.1T

Surface Accuracy(R.M.S)

Main reflector:0.5mm, subreflector:0.4mm

ENVIRONMENT SPECIFICATIONS                                           

Working wind speed

72km/h

Suvival wind speed

120km/h

Humidity

100%

Climate adaptability

With dust-proof, waterproof, moisture-proof, mildew-proof, anti-corrosion and other measures

Temperature

-30～70℃