Patent ID: 8427371

Claim:
A feed network for an antenna subarray comprising: a first feed arrangement having a sum forming signal output; a second feed arrangement having a delta forming signal output; a fixed attenuator having a first port and a second port, the first port of the fixed attenuator connected to the delta forming signal output of the second feed arrangement; a first power divider/combiner having a first and second, port and a third port; the first port of the first power divider/combiner connected to the second port of the fixed attenuator; a variable phase shifter having a first port and a second port, the first port of the variable phase shifter connected to the second, port of the first power divider/combiner; a variable attenuator having a first port and a second port, the first port of the variable attenuator connected to the second port of the variable phase shifter; a second power divider/combiner having a first and second port and a third port; the first port divider/combiner: connected to the second port of the fixed attenuator; a first circulator having a first port, a second port and a third port, the first port of the first circulator connected to the sum forming signal output of the first feed arrangement and the second port of the first circulator connected to the third ort of the second power divider/combiner; and a second circulator having a first port, a second port and a third port; the first port of the second circulator connected to the second port of the second power divider/combiner and the second port of the second circulator connected to the third port of the first circulator.