Buoyant helical twin-axial wire antenna
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorDavid A Tonn
Life of this patent
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Abstract
An antenna includes a polymer coating having a VLF/LF element and an HF/VHF element embedded therein. A blocking choke is interposed between the VLF/LF element and the antenna feed t block HF/VHF signals. Small chokes are regularly positioned on the VLF/LF element to eliminate resonances caused by mutual capacitance between the elements. Reactive loads are positioned in said HF/VHF element at regular intervals for optimizing performance of the antenna in the HF/VHF radio bands. In further embodiments the antenna is provided as a floating antenna with the elements helically arranged therein.
Claims4
A buoyant antenna comprising:
- a polymer foam coating;
- a VLF/LF element embedded in said polymer foam coating having a first end being capable of joining to the antenna feed and a second end;
- a grounding ring in contact with the environment and joined to said VLF/LF element second end for grounding said VLF/LF element;
- an HF/VHF element embedded in said polymer foam coating and insulated from electrical contact with said VLF/LF element having a first end being capable of joining to the antenna feed and a second end isolated from said grounding ring and said VLF/LF element wherein said HF/VHF element and said VLF/LF element are helically positioned within said polymer foam coating about a center of said polymer foam coating with a constant pitch angle between said elements;
- a blocking choke interposed between said VLF/LF element first end and the antenna feed for blocking HF and VHF radio signals from the VLF/LF element;
- a plurality of small chokes regularly positioned on said VLF/LF element;
- and
- a plurality of reactive loads positioned in said HF/VHF element at regular intervals for optimizing performance of the antenna in the HF/VHF radio bands.
Dependencies are inferred from the claim text.