Small low profile antennas using high impedance surfaces and high permeability, high permittivity materials

• US 6,967,621 B1
• Filed: 03/16/2004
• Issued: 11/22/2005
• Est. Priority Date: 03/16/2004
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Wilber, William D., Cadotte, Roland Jr.
• Primary Examiner(s): Ho, Tan
• Application Number:
  US10/808,035
• Time in Patent Office: 616 Days
• Field of Search: 343/700.MS, 343/846, 343/848, 343/787, 343/909
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 15/008 said selective devices having Sievenpipers' mushroom elements
• CPC Class Codes: H01Q 15/0093 having a fractal shape
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

A low profile antenna includes an antenna and a ground plane structure operatively associated with the antenna. The ground plane structure has a generally planar surface, at least one protrusion extending from the planar surface and a dielectric substrate supported by the planar surface. The dielectric substrate includes a relative permeability (μ) of greater than or equal to about one and a relative permittivity (ε) of greater than or equal to about one.

Claims

1. A low profile antenna, comprising:

A fractal pattern antenna being generally planar in configuration and extending in a first direction; and

a ground plane structure operatively associated with the antenna, the ground plane structure comprising;

a generally planar surface that extends in a direction that is generally parallel to the first direction;

at least one protrusion extending from the planar surface; and

a dielectric substrate supported by the planar surface, the dielectric substrate comprising a ferrimagnetic material that has a relative permeability (μ

) of greater than or equal to about one and a relative permittivity (ε

) of greater than or equal to about one.

2. The antenna of claim 1, wherein the at least one protrusion comprises:

a plurality of pedestals; and

a plurality of posts interconnecting each of the pedestals and the planar surface;

wherein the dielectric substrate extends between the planar surface and the pedestals.

3. The antenna of claim 2, wherein:

the plurality of pedestals are disposed about the antenna;

the antenna extends in a direction that is generally parallel to that of the planar surface; and

the dielectric substrate further extends between the antenna and the planar surface.

4. The antenna of claim 3, wherein each of the pedestals comprise a generally hexagonal outer configuration.

5. The antenna of claim 4 wherein the antenna comprises a generally triangular outer configuration.

6. The antenna of claim 1, wherein a thickness of the dielectric substrate is less than one-half wavelength of a signal input to the antenna.

7. The antenna of claim 1, wherein the dielectric substrate comprises a permeability (μ

) that is in the range of between about one and about one hundred.

8. The antenna of claim 1, wherein the dielectric substrate comprises a permittivity (ε

) that is in the range of between about one and about one hundred.

9. The antenna of claim 1, wherein the ferrimagnetic material comprises magnesium ferrite.