Dynamically reconfigurable wire antennas

• US 6,967,628 B2
• Filed: 06/13/2003
• Issued: 11/22/2005
• Est. Priority Date: 06/13/2003
• Status: Expired due to Fees

• Current Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Rawnick, James J., Brown, Stephen B.
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US10/460,947
• Publication Number:
  US 20040252069A1
• Time in Patent Office: 893 Days
• Field of Search: 343/700.MS, 343/702, 343/793, 343/795, 343/872, 343/789, 451/36, 451/41
• US Class Current: 343/793
• CPC Class Codes: H01Q 1/364 using a particular conducting material, e.g. superconductor
• CPC Class Codes: H01Q 9/14 Length of element or elements adjustable telescopic elements H01Q1/10
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

An antenna (100) includes an antenna radiating element (108) that is at least partially comprised of a conductive fluid (104). A dielectric structure (102) defines at least one cavity (110A, 110B) for constraining the conductive fluid. The antenna also includes a fluid control system (116A, 116B, 118A, 118B, 120A, 120B, 122) for selectively adding and removing the conductive fluid from the cavity for controlling a dimension of the antenna radiating element (108). The antenna radiating element (108) can be comprised of a plurality of cavities (110A, 110B), with each cavity defining a segment of the antenna radiating element (108).

Claims

1. An antenna comprising:

a conductive fluid;

a dielectric structure defining a plurality of cavities for constraining said conductive fluid, said cavities defining a plurality segments of an antenna radiating element; and

a permanent electrical connection provided between adjacent cavities by a conductor; and

a fluid control system automatically electrically connecting and disconnecting adjacent segments of said radiating element to one another by controlling a presence or removal of conductive fluid to and from said adjacent cavities.

2. The antenna according to claim 1, wherein at least two of said cavities are electrically coupled to one another through said conductor.

3. The method according to claim 1, wherein said conductor is a conductive wall disposed between adjacent cavities.

4. The method according to claim 3, wherein at least one portion of said conductive wall is exposed to an interior of each of said adjacent cavities.

5. An antenna, comprising:

a conductive fluid;

a dielectric structure comprising a plurality of cavities for constraining said conductive fluid, each of said cavities defining a segment of an antenna radiating element;

a fluid control system for selectively adding and removing said conductive fluid from said plurality of cavities; and

a permanent electrical connection provided between adjacent cavities by a conductor extending between a respective interior of each of said adjacent cavities, wherein the controlled presence or absence of said conductive fluid from each of said cavities automatically electrically connects or disconnects adjacent cavities to determine at least one physical dimension of said antenna radiating element.

6. The antenna according to claim 5 wherein said fluid control system is comprised of a fluid reservoir and at least one pump.

7. An antenna, comprising:

a conductive fluid;

a dielectric structure comprising a plurality of cavities for constraining said conductive fluid, each of said cavities defining a segment of an antenna radiating element;

a fluid control system for selectively adding and removing said conductive fluid from said plurality of cavities; and

a permanent electrical connection provided between adjacent cavities by a conductor extending between a respective interior of each of said adjacent cavities, wherein the presence or absence of said conductive fluid from each of said cavities, determines at least one physical dimension of said antenna radiating element, and wherein said fluid control system comprises a fluid reservoir, at least one pump, and a controller responsive to an antenna control signal for selectively controlling an operation of said pump.

8. The antenna according to claim 7 wherein said controller is responsive to an antenna control signal for selectively controlling an operation of at least one valve.

9. An antenna, comprising:

a conductive fluid;

a dielectric structure comprising a plurality of cavities for constraining said conductive fluid, each of said cavities defining a segment of an antenna radiating element;

a permanent electrical connection provided between adjacent ones of said cavities by a conductor extending between a respective interior of each of said cavities, said conductor automatically forming an electrical connection with said conductive fluid when said conductive fluid is constrained within a respective one of said cavities;

wherein said antenna radiating elements are arranged to form a dipole.

10. An antenna, comprising:

at least one antenna radiating element;

a conductive fluid;

a dielectric structure defining at least one cavity for constraining said conductive fluid, wherein at least a portion of said radiating element is comprised of said conductive fluid;

wherein said conductive fluid is comprised of gallium and indium alloyed with a material selected from the group consisting of tin, copper, zinc and bismuth.