Receive Only Feed Network for Simultaneous C Band And Ku Band Operations on Large Aperture Antennas

A variation on an existing antenna feed system for use on simultaneous C/Ku-band satellite ground terminals is presented. Multiband feed technology is usually used to Large Aperture antennas.

With the introduction of the Wideband Global Satcom (WGS) satellites, simultaneous operation in C-Band and in KU-Band will be a requirement for many terminals.           Advanced Microwave Technologies Co., Ltd is a provider of multiband feeds and has developed feed systems that operate simultaneously in C-Band and KU-Band in receive. 

1. Working frequency:

  C  band： 3.4～4.8GHz;                Ku  band： 10.75～12.75GHz;

2. Polarization mode: 

C-band: double circular/double linear;             Ku band: double linear;

The C-band feed source performs polarization switching according to the RHCP/VLP, LHCP/HLP agreed method, and the C-band circular/linear polarization is motorized switched, and the linear polarization surface can be remotely controlled motorized, and the adjustment range is ±92˚; The Ku frequency band can be adjusted independently, and the adjustment range is ±45˚.

3.  Circular Polarization Axis Ratio：≤1.06；

4. VSWR: 

Circular polarization≤1.25:1, Linear polarization≤1.25:1

5. Port isolation

Band isolation：50dB； linear polarization：30dB；  circular polarization：20dB.

6. Feed interface： 

C band：WR-229； Ku band：WR-75.

7. Feed insertion loss: 

C band: ≤0.3dB； Ku band: ≤0.5dB。