Decoupled concentric helix antenna
AssigneeThe MITRE Corporation
InventorsIan T. McMichael, Erik T. Lundberg, Mohamed Wajih Elsallal
Life of this patent
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Abstract
A multi-band helix antenna including one or more first arms extending helically about an axis at a first distance from the axis; and one or more second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, wherein each of the one or more second arms comprises at least one trap circuit configured to have a first impedance at a resonant frequency of the one or more first arms and a second impedance at a resonant frequency of the one or more second arms, and the first impedance is greater than the second impedance.
Claims20
A multi-band helix antenna comprising:
- one or more first arms extending helically about an axis at a first distance from the axis;
- and
- one or more second arms extending helically about the axis at a second distance from the axis that is greater than the first distance,
- wherein each of the one or more second arms comprises at least one trap circuit configured to have a first impedance at a resonant frequency of the one or more first arms that breaks each of the one or more second arms into multiple sections at the resonant frequency of the one or more first arms so that the one or more second arms are decoupled from the one or more first arms at the resonant frequency of the one or more first arms and a second impedance at a resonant frequency of the one or more second arms, and the first impedance is greater than the second impedance.
A multi-band quadrifilar helix antenna comprising:
- four first arms extending helically about an axis at a first distance from the axis;
- four second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, wherein each second arm comprises at least one trap circuit configured to have an impedance at a resonant frequency of the first arms that breaks the respective second arm into multiple sections at the resonant frequency of the first arms so that the second arms are decoupled from the first arms at the resonant frequency of the first arms;
- a ground plane at the first end of the antenna that is electrically isolated from the first and second arms;
- and
- a feed network electrically connected to the first and second arms for feeding circularly polarized signals.
A multi-band helix antenna comprising:
- one or more first arms extending helically about an axis at a first distance from the axis;
- one or more second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, each of the one or more second arms comprising at least one trap circuit,
- wherein the at least one trap circuit is configured to have a first impedance at a resonant frequency of the one or more first arms that breaks each of the one or more second arms into multiple sections at the resonant frequency of the one or more first arms so that the one or more second arms are decoupled from the one or more first arms at the resonant frequency of the one or more first arms.
Dependencies are inferred from the claim text.