Multi-mode dual circularly polarized spiral antenna
First Claim
1. A dual circular polarization spiral antenna which is capable of providing multiple modes of operation comprising:
- a plurality of conductive spiral antenna arms extending outward about an axis of rotation, each antenna arm having an inner end and an outer end and arm width modulations, said arm width modulations including alternately located wide sections and narrow sections for reflecting electromagnetic energy so as to enable radiation and detection of dual circular polarization, wherein a width ratio of said wide sections to said narrow sections increases from said inner end of each of said spiral antenna arms as said spiral antenna arms extend outward about said axis of rotation and said wide sections have a width of greater than four times the width of said narrow sections; and
feed means coupled to the inner end of each of said spiral antenna arms for providing predetermined phase excitations to achieve selected operating modes.
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Abstract
A spiral antenna is provided which is capable of providing dual circular polarization operation with a large number of operating modes. The spiral antenna includes at least eight conductive spiral antenna arms extending outward about an axis of rotation. Each antenna arm has an inner end and an outer extending end and a plurality of arm width modulations formed therebetween for achieving dual circular polarization operation capability. Electrical feeds are coupled to the inner end of each of the spiral antenna arms. A feed network may be further connected to the electrical feeds for providing predetermined phase excitations to the corresponding spiral antenna arms so as to achieve the desired operating modes.
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Citations
19 Claims
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1. A dual circular polarization spiral antenna which is capable of providing multiple modes of operation comprising:
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a plurality of conductive spiral antenna arms extending outward about an axis of rotation, each antenna arm having an inner end and an outer end and arm width modulations, said arm width modulations including alternately located wide sections and narrow sections for reflecting electromagnetic energy so as to enable radiation and detection of dual circular polarization, wherein a width ratio of said wide sections to said narrow sections increases from said inner end of each of said spiral antenna arms as said spiral antenna arms extend outward about said axis of rotation and said wide sections have a width of greater than four times the width of said narrow sections; and feed means coupled to the inner end of each of said spiral antenna arms for providing predetermined phase excitations to achieve selected operating modes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multi-mode spiral antenna which is capable of handling dual circular polarization comprising:
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at least eight conductive spiral antenna arms extending outward about an axis of rotation, each antenna arm having an inner end and an outer end with a plurality of arm width modulations, said arm width modulations including alternately located wide sections and narrow sections for reflecting electromagnetic energy so as to enable radiation and detection of at least three modes of left-hand circular polarization and at least three modes of right-hand circular polarization, wherein a width ratio of said wide sections to said narrow sections increases from said inner end of each of said spiral antenna arms as said spiral antenna arms extend outward about said axis of rotation; and feed means coupled to the inner end of each of said spiral antenna arms for providing predetermined phase excitations in order to adapt said multi-mode spiral antenna for providing at least six selected operating modes. - View Dependent Claims (9, 10, 11)
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12. A method for providing a multi-mode dual circular polarization spiral antenna comprising:
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forming an array of at least eight conductive spiral antenna arms in a spiral pattern about an axis of rotation, each arm having an inner end and an outer end; forming modulations in each of said spiral antenna arms so as to provide for alternatively located first and second segments including the step of increasing a ratio of width of said second segments to said first segments as each of said spiral antenna arms extends outward about said axis of rotation, and wherein said ratio increases so that said second segments have a conductive width of at least four times the width of said first segments; and coupling the inner end of each of said conductive spiral antenna arms to a feed network that is adapted to provide phase excitations for achieving at least six operating modes. - View Dependent Claims (13, 14, 15)
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16. A dual circular polarization spiral antenna which is capable of providing multiple modes of operation comprising:
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a plurality of conductive spiral antenna arms extending outward about an axis of rotation, each antenna arm having an inner end and an outer end and arm width modulations, said arm width modulations including alternately located wide sections and narrow sections for reflecting electromagnetic energy so as to enable radiation and detection of dual circular polarization, wherein a ratio of width of said wide sections to said narrow sections increases from the inner end of each of said spiral antenna arms as said spiral antenna arms extend outward about said axis of rotation; and feed means coupled to said inner end of each of said spiral antenna arms adapted to provide predetermined phase excitations to achieve selected operating modes. - View Dependent Claims (17, 18, 19)
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Specification