Buoyant helical twin-axial wire antenna

Patent metadata

Field	Value
Publication number	US-9882273-B2
Application number	US-201615351927-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	May 19, 2014
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

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.

First claim

What is claimed is:

1. 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.

2. The apparatus of claim 1 wherein each said reactive loads comprises a capacitor.

3. The apparatus of claim 2 wherein a portion of said reactive loads further comprise an inductor positioned in parallel with said capacitor.

4. The apparatus of claim 1 wherein each said reactive load further comprises an inductor positioned in parallel with said capacitor.

Assignees

• Tonn David A
• Us Navy

Inventors

• Tonn David A

Classifications

• H01Q5/321

  within a radiating element or between connected radiating elements · CPC title

• H01Q1/362

  for broadside radiating helical antennas · CPC title

• H01Q1/34 Primary

  Adaptation for use in or on ships, submarines, buoys or torpedoes (for subaqueous use H01Q1/04) · CPC title

• H01Q1/04

  Adaptation for subterranean or subaqueous use · CPC title

• H01Q1/48

  Earthing means; Earth screens; Counterpoises · CPC title