Helical antennas
First Claim
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1. An antenna comprising:
- a pliable, electrically insulating substrate in the form of a sheet;
a first group of coupled metal resonating elements deposited upon said sheet to define a first spiral, said elements resonating at frequencies within a first pass band;
a second group of coupled metal resonating elements fixedly disposed upon said sheet to define a second spiral, said elements resonating at frequencies within a second pass band; and
a cylindrical insulator having one end that is adapted for connection to a surface of an electrically conductive ground plate, said sheet being wound on said cylindrical insulator to cause said first and second groups of resonating elements to define first and second helixes, respectively.
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Abstract
A plurality of coaxially wound, untuned helical antennas have a pitch that is a function of displacement along the axis of the antennas. The untuned antennas may be excited by signals that have a selected phase shift therebetween. The excitation causes an additive combining of electromagnetic waves radiated by the untuned antennas. The helical antennas may be tuned to radiate the waves in respective bands of frequencies, thereby simultaneously providing filtering and radiation characteristics that make the tuned antennas suitable for frequency diplexing.
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Citations
3 Claims
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1. An antenna comprising:
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a pliable, electrically insulating substrate in the form of a sheet; a first group of coupled metal resonating elements deposited upon said sheet to define a first spiral, said elements resonating at frequencies within a first pass band; a second group of coupled metal resonating elements fixedly disposed upon said sheet to define a second spiral, said elements resonating at frequencies within a second pass band; and a cylindrical insulator having one end that is adapted for connection to a surface of an electrically conductive ground plate, said sheet being wound on said cylindrical insulator to cause said first and second groups of resonating elements to define first and second helixes, respectively. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeLockheed Martin Corporation (Martin Marietta Corporation)
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Original AssigneeRCA Corporation (General Electric Company)
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InventorsFoldes, Peter
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Primary Examiner(s)Lieberman, Eli
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Application NumberUS05/806,283Time in Patent Office659 DaysField of Search343/846, 343/895US Class Current343/895CPC Class CodesH01Q 1/362 for broadside radiating hel...H01Q 11/08 Helical antennas
