DC inductive shorted patch antenna

• US 20030137457A1
• Filed: 09/12/2002
• Published: 07/24/2003
• Est. Priority Date: 01/23/2002
• Status: Active Grant

• Current Assignee: OAE Technology Incorporated
• Original Assignee: E-Tenna Corporation
• Inventors: McKinzie, William E. III, Dutton, John, Mendolia, Greg S.
• Granted Patent: US 6,882,316 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 15/0013 said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

A direct current (DC) inductive shorted patch antenna includes a direct current inductive (DCL) frequency selective surface (FSS) forming the radiating element, a ground plane, a feed, and a radio frequency (RF) short to the ground plane positioned between the feed and the radiating element.

Claims

1. A patch antenna comprising:

a direct current inductive (DCL) frequency selective surface (FSS) including a radiating element;

a ground plane;

a feed; and

a radio frequency (RF) short to the ground plane.

2. The patch antenna of claim 1 where the feed is located near a corner of the patch antenna.

3. The patch antenna of claim 1 wherein the feed is located at an end of a transmission line which models the radiating element.

4. The patch antenna of claim 1 wherein the RF short is located such that a distance from the RF short to a center of the patch antenna is less than a distance from the feed to the center of the patch antenna.

5. The patch antenna of claim 1 wherein the patch antenna is fabricated as a pair of coupled transmission lines.

6. The antenna of claim 1 wherein the DCL FSS comprises metallization disposed on a dielectric layer separating the metallization from the ground plane.

7. The antenna of claim 1 wherein the metallization is patterned to define capacitance and inductance of the DCL FSS.

8. The antenna of claim 7 wherein the metallization is patterned to define one or more interdigitated portions.

9. The antenna of claim 7 wherein the metallization is patterned to define one or more meandered portions.

10. The antenna of claim 7 wherein the metallization is patterned to define a combination of one or more interdigitated portions and one or more meandered portions.

11. The antenna of claim 7 wherein the metallization comprises:

surrounding metal lines having a first width; and

pattern metal lines at least partly within the surrounding metal lines and having a second width.

12. An antenna modeled by an equivalent circuit comprising at least one pair of coupled transmission line sections, wherein each coupled line section is defined by even mode and odd mode characteristic impedances and even mode and odd mode effective dielectric constants, wherein the effective dielectric constants exceed unity by virtue of using printed inductors and printed capacitors instead of using medium to high dielectric constant substrate materials.

13. The antenna of claim 12 wherein the feed is located proximate the end of one of the coupled transmission line sections.

14. The antenna of claim 12 wherein an RF short to ground is located at a circuit node between sections of coupled transmission lines.

15. An antenna comprising:

a ground plane;

a foam substrate;

a flexible dielectric layer disposed on the foam substrate; and

metallization disposed on the flexible dielectric layer to define capacitance and inductance to produce a resonance at one or more frequencies of interest.

16. The antenna of claim 15 wherein the metallization is patterned to define a radiating element including a feed end and a radiating portion.

17. The antenna of claim 16 further comprising:

a feed electrically engaging the feed end of the radiating element; and

an RF short configured to electrically ground a ground point of the radiating element, the ground point positioned between the feed end and the radiating portion.

18. The antenna of claim 15 wherein the metallization comprises:

one or more meanderlines.

19. The antenna of claim 15 wherein the metallization comprises:

one or more interdigitated structures. 20. The antenna of claim 15 wherein the metallization comprises;

one or more interdigitated structures combined with one or more meanderlines to produce the resonance at the one or more frequencies of interest.