Wide bandwidth multiband feed system with polarization diversity

An antenna source system for receiving microwave signals in at least a first lower frequency band and a second higher frequency band, comprising:

• a waveguide dimensioned to simultaneously propagate signals in said first and said second frequency bands to a first orthomode junction, and having a stopband characteristic for signals in said first lower frequency band and a passband characteristic for passing signals in said second higher frequency band past said first orthomode junction;
• said first orthomode junction coupling signals in said first frequency band in and out of said waveguide and having a first input access coupled to said waveguide through a single slot and five second output accesses;
• first filter means coupled to four of said five second output accesses of said first orthomode junction, and having a stopband characteristic for signals in said second higher frequency band and a passband characteristic for signals in said first lower frequency band;
• a second orthomode junction having four first input accesses coupled to said first filter means and two second output accesses;
• a first and second orthomode transducer each having a first access for receiving signals in one of said frequency bands and a second access, said first orthomode transducer and said second orthomode transducer being respectively coupled between the other of said five second accesses of said first orthomode junction which constitutes a part of said waveguide and between said two second accesses of said second orthomode junction;
• a first 90.degree. polarizing device and a first 180.degree. polarizing device coupled in series between said first access and said second access of said first orthomode transducer and said other of said five second accesses of said first orthomode junction;
• a second 90.degree. polarizing device and a second 180.degree. polarizing device coupled in series between said first access and said second access of said second orthomode transducer and said two second accesses of said second orthomode junction;
• and
• a radiating element connected to an end of said waveguide.