FEEDING SYSTEM FOR SIMULTANEOUSLY RECEIVING CIRCULAR POLARIZATION AND LINEAR POLARIZATION

摘要

PURPOSE: A feeding system for simultaneously receiving a circular polarization and a linear polarization is provided to reduce the interference of probes receiving the circular polarization and the linear polarization by forming a shield layer performing a reflector function on the rear of a printed circuit board. CONSTITUTION: A feedhorn(30) receives a signal focused by an antenna for receiving a satellite broadcasting signal. A cylindrical waveguide(40) is mounted on a backward end of the feedhorn(30). A printed circuit board(50) is mounted on a backward end of the cylindrical waveguide(40). The cylindrical waveguide(40) is provided with probes(42,46) for receiving a circular polarization and a linear polarization. A linear polarization reflector(44) is arranged on a rear of the cylindrical waveguide(40) in order to increase the receive sensitivity of the first probe(42). The second probe(46) is provided with the linear polarization reflector(44) in a width direction in order to receive the circular polarization.