Passive beamformer with low side lobes
First Claim
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1. Apparatus for reducing the effective side lobe level of a multi-element directional antenna system used to transmit and receive propagated signals comprising, a first array of elements having uniform shading and a second array of elements partitioned into a plurality of equal parts, the parts being electrically connected so that the second array is bizonally shaded, the second array being approximately 60 percent longer than the first array.
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Abstract
A pulsed-transmission, narrow-band sonar system has a first antenna array ich is unshaded and a second array partitioned into four parts, the center two of which are electrically connected in parallel and the outer two of which are connected in series.
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2 Claims
- 1. Apparatus for reducing the effective side lobe level of a multi-element directional antenna system used to transmit and receive propagated signals comprising, a first array of elements having uniform shading and a second array of elements partitioned into a plurality of equal parts, the parts being electrically connected so that the second array is bizonally shaded, the second array being approximately 60 percent longer than the first array.
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Current Assigneethe united states of america as represented by the secretary of the navy
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Original Assigneethe united states of america as represented by the secretary of the navy
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InventorsZehner, William J.
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Primary Examiner(s)Pihulic, Daniel T.
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Application NumberUS08/083,600Time in Patent Office377 DaysField of Search367/905, 367/138, 367/154, 367/103, 367/105, 367/119, 342/154, 342/354US Class Current367/138CPC Class CodesG10K 11/348 using amplitude variationY10S 367/905 Side lobe reduction or shading
