Adjustable polarization antenna system

Claim 1

In an antenna feed system for coupling radio frequency waves from two sources of linearly polarized waves at a first frequency band to a radiating means and for coupling a pair of orthogonally positioned linearly polarized signal waves at a second frequency band from said radiating means to a pair of receiver loads, the combination comprising: first and second transmitter terminals each adapted to be coupled to a separate source of linearly polarized radio waves; first and second receiver terminals each adapted to be coupled to a separate receiver load; an orthogonal coupler having three coupling terminals, the first coupling terminal adapted to pass linearly polarized waves of a first orientation, the second coupling terminal adapted to pass linearly polarized waves of a second orientation orthogonal to said first orientation, and a third coupling terminal adapted to pass waves polarized at either of said first and second orientations or at orientations the vectorial sum of said first and second orientation; adjustable power dividing means coupled to said first and second transmitter terminals and responsive to first linearly polarized waves from said first and second transmitter sources for power dividing the waves from said first and second sources according to selected power ratios To provide first power divided waves at a first given ratio of power from said first source at first and second power divider outputs respectively and to provide second power divided waves at a second selected ratio of power being the reciprocal of said given ratio at said first and second power divider outputs respectively; first and second duplexers each adapted to pass signals within both first and second frequency bands at a multiple frequency band coupling terminal, to pass signals only within said first frequency band at a first frequency band coupling terminal and to pass signals only within said second frequency band at a second frequency band coupling terminal; said first duplexer coupled at said multiple band coupling terminal to the first coupling terminal of said orthogonal coupler and said second duplexer coupled at said multiple band coupling terminal to said second coupling terminal of said orthogonal coupler whereby said orthogonally positioned waves at said second frequency band from said radiating means are converted to third and fourth power divided waves representative of the horizontal and vertical components of said orthogonally positioned waves and said third and fourth power divided waves are coupled to said second frequency band coupling terminal of said first and second duplexers respectively; said first frequency band coupling terminal of said first duplexer coupled to said first power divider output of said adjustable power divider and said first frequency band coupling terminal of said second duplexer coupled to said second power divider output terminal of said adjustable power divider whereby in response to said power divider waves at said first and second ratios of power at said power divider outputs, two resultant linearly polarized waves of selected orthogonal orientation are transmitted through the third terminal of said orthogonal coupler, means coupled to said power dividing means for adjusting said power ratios to alter the orientations of said two resultant linearly polarized waves equally to maintain orthogonal relationship; adjustable power combiner means including a tunable phase shifting means coupled between said first and second receiver terminals and said second frequency band coupling terminal of said first and second duplexer and responsive to said third and fourth power divided waves at said second frequency band for coupling maximum power from one of said orthogonally positioned linearly polarized waves at a given orientation out of said first receiver terminal and maximum power from the other orthogonally polarized received waves out of the second receiver terminal; and means for independently adjusting the tuned position of said phase shifting means depending on the orientation of said orthogonally positioned linearly polarized waves from said radiating means to couple maximum power from any one of the received orthogonally positioned waves from the radiating means out of said first receiver terminal and maximum power from the other orthogonally positioned waves from the radiating means out of said second receiver terminal.