Patent ID: 9059682
Filing Date: 2015-06-16
Classification: H01P,H03H

Abstract:
1. An advanced reverse orthomode junction feed assembly with associated filters for use in an antenna feed system for transmitting and/or receiving a first electromagnetic signal at a first frequency range and receiving and/or transmitting a second electromagnetic signal at a second frequency range for providing a high RF performance of the antenna feed system in a spacecraft vacuum environment, said junction feed assembly comprising: an orthomode junction including an antenna port for connecting to an antenna and defining a main junction axis, an opposed first signal port generally coaxial with the junction axis to transmit said first signal, and a second signal port generally perpendicular to the main junction axis to receive said second signal, said second signal port being located between said antenna port and said first signal port and including four outer ports orthogonal to each other; a first signal channel operating at the first frequency range and having an on-axis second signal reject filter connecting to the first signal port, the on-axis second signal reject filter including a plurality of filter sections with at least one said filter section being a stub, each said filter section having a respective on-axis length dimension along said main junction axis and a respective cross-axis length dimension perpendicular to the main junction axis, said on-axis and cross-axis length dimensions of each said filter section being different than respective length dimensions of all other of said filter sections; and a second signal channel operating at the second frequency range higher that the first frequency range and having cross-axis first signal reject filters connecting to said second signal port, wherein said first and second signal channels respectively operating with said first and second signals being dual polarization signals.