Intermediate frequency side-lobe canceller

• US 3,202,990 A
• Filed: 05/04/1959
• Issued: 08/24/1965
• Est. Priority Date: 05/04/1959
• Status: Expired due to Term

• Current Assignee: Paul W. Howells
• Original Assignee: Paul W. Howells
• Inventors: Howells, Paul W.
• Application Number:
  US03/810,961
• Time in Patent Office: 2,304 Days
• US Class Current: 342/381
• CPC Class Codes: G01S 7/2813 Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays specially adapted to secondary radar systems G01S13/762; aerials or aerials systems H01Q21/29, H01Q25/00
• CPC Class Codes: H01Q 3/2629 Combination of a main antenna unit with an auxiliary antenna unit
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements

Claims

1. IN A NOISE CANCELLER, A MAIN SIGNAL TRANSMISSION CHANNEL HAVING AN OUTPUT TERMINAL, AN AUXILIARY SIGNAL TRANSMISSION CHANNEL HAVING AN OUTPUT TERMINAL, SAID CHANNELS HAVING CROSS COUPLING THEREBETWEEN, MEANS FOR DETECTING THE RELATIVE AMPLITUDE AND PHASE OF EACH OF THE CROSS COUPLED SIGNALS, A COMPENSATING CROSS FEED NETWORK CAPABLE OF ADJUSTMENT FOR MINIMIZING CROSS COUPLING AT AT LEAST ONE OUTPUT TERMINAL, MEANS RESPONSIVE TO SAID RELATIVE AMPLITUDE AND PHASE FOR AUTOMATICALLY ADJUSTING SAID CROSS FEED NETWORK IN ORDER TO MINIMIZE CROSS COUPLING.