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Patent 7969370 Click For Printable Version of This Patent
Patent Information:  USPTO Site Listing

Patent Number: 7969370
Case ID: 0
Patent Title: Liquid antennas
Status: ACTIVE
Status Date: 11/29/2011 10:02:07 AM
Issue Date: 6/28/2011
Filed Date: 2/23/2009
Serial #: 2/390,868
Assignee Name: The United States of America as repesented by the Secretary of the Navy (Washington, DC)
Inventor(s): Dinh, Vincent V. , Hendricks, Eric W.
Lab Information:  View Lab Profile

Lab Name: SPAWAR Systems Center, Pacific
Location: 53560 Hull Street
San Diego, CA 92152-5001
Contact: Contact Lab About This Patent
   
Description:
FIELD OF THE INVENTION

This disclosure relates to communication systems. More particularly, this disclosure relates to an antenna system utilizing a charge carrying fluid as the radiating medium.

BACKGOUND OF THE INVENTION

In a shipboard environment, real estate is a precious commodity, especially at the top-side of the ship. A mid-sized ship will have somewhere in the range of 50 or more antennas to provide the necessary communication and tactical capabilities. Thus, there has been an on-going tradeoff between the available real estate on the ship versus the number of antennas desired for deployment on the ship. Another issue is that all of the antennas have fixed metal as the primary radiating surface and, therefore, even in the non-active mode, the surface of the antenna will reflect energy. The reflected energy (sourced from another vessel) renders the ship "visible" to the other vessel''s radar.

Therefore, there is a need for an antenna syst . . . . More
Abstract:
A fluidic antenna is described, using an electromagnetic energy coupler, a non-metallic container coupled to the electromagnetic energy coupler, a fluid having charged particles moving through the non-metallic container at a predetermined rate, and a charge focuser disposed about the non-metallic container, wherein the electromagnetic energy coupler is configured to couple energy between the fluid and at least one of a transmitter and receiver, and the charge focuser is configured to adjust a cross sectional area of charged particles in the fluid to result in a fluid characteristic impedance that approaches that of a surrounding medium, thereby enabling at least one of launching and receiving electromagnetic energy.
Claims:
What is claimed is:

1. A fluidic antenna, comprising: an electromagnetic energy coupler; a non-metallic container coupled to the electromagnetic energy coupler; fluid having charged particles moving through the non-metallic container at a predetermined rate; and a charge focuser disposed about the non-metallic container, wherein the electromagnetic energy coupler is configured to couple energy between the fluid and at least one of a transmitter and receiver, and the charge focuser is configured to adjust a cross sectional area of charged particles in the fluid to result in a fluid characteristic impedance that approaches that of a surrounding medium, thereby enabling at least one of launching and receiving electromagnetic energy.

2. The fluidic antenna of claim 1, wherein the non-metallic container forms a ring.

3. The fluidic antenna of claim 1, wherein the electromagnetic energy coupler utilizes magnetic flux linkage to couple into the fluid.

 . . . . More