Broadband electromagnetic band-gap (EBG) structure

Patent metadata

Field	Value
Publication number	US-9407011-B2
Application number	US-201213713030-A
Country	US
Kind code	B2
Filing date	Dec 13, 2012
Priority date	Feb 22, 2012
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

An electromagnetic bandgap structure comprising a progressive cascade of a plurality of patterns of cells. The cells of each pattern are dimensioned so that each pattern has a reflection phase response centered at a different, but closely-spaced, frequency compared with the reflection phase response of an adjacently positioned pattern, so that the combined reflection phase response of the plurality of patterns provides a continuous wideband operational range.

First claim

The invention claimed is:

1. An electromagnetic bandgap structure comprising:
a progressive cascade of a plurality of patterns of electromagnetic bandgap cells, adjacently positioned in a parallel manner about a center pattern, the cells of each pattern being dimensioned so that each pattern has a reflection phase response centered at a different, but closely-spaced, frequency compared with the reflection phase response of an adjacently positioned pattern, and each pattern is formed on a dielectric substrate so that the combined reflection phase response of the plurality of patterns provides a continuous wideband operational range.

2. The electromagnetic bandgap structure of claim 1 , wherein each pattern comprises a plurality of unit cells patterned on a dielectric substrate.

3. The electromagnetic bandgap structure of claim 2 , wherein the cells of each pattern have one or more characteristics that cause each pattern to have a respective predetermined resonance and reflection phase response which is different from, but closely spaced to, the resonance and reflection phase response of an adjacent pattern.

4. The electromagnetic bandgap structure of claim 3 , wherein each cell comprises a conductive surface element having a given shape and spacing to an adjacent surface element so as to form a capacitive element on the dielectric substrate and coupled with a metalized via that passes underneath the surface element and through the dielectric substrate so as to form an inductive element.

5. The electromagnetic bandgap structure of claim 3 , wherein each cell comprises a conductive surface element having a given shape and spacing to an adjacent surface element so as to form both a capacitive element and an inductive element on the dielectric substrate.

6. The electromagnetic bandgap structure of claim 1 , further including an antenna positioned above the electromagnetic bandgap structure.

7. The electromagnetic bandgap structure of claim 6 , wherein the antenna is positioned above the electromagnetic bandgap structure in a space substantially less than one quarter of the wavelength of a frequency in the operational range.

8. The electromagnetic bandgap structure of claim 6 , wherein the antenna is positioned above the electromagnetic bandgap structure at a level approximately one tenth or less of the wavelength of a frequency in the operational range.

9. The electromagnetic bandgap structure of claim 6 , wherein the antenna is a dipole and the patterns of the electromagnetic bandgap structure are adjacently positioned in a symmetric parallel manner about a center pattern.

Assignees

• Us Army Res Lab
• Us Army

Inventors

• Zaghloul Amir I
• Weiss Steven J

Classifications

• H01Q15/14

  Reflecting surfaces; Equivalent structures {(electromagnetic shields H01Q1/526)} · CPC title

• H01Q19/108

  Combination of a dipole with a plane reflecting surface (H01Q19/106 takes precedence; strip line H01Q9/065) · CPC title

• H01Q15/008 Primary

  said selective devices having Sievenpipers' mushroom elements · CPC title

• H01Q19/10 Primary

  using reflecting surfaces · CPC title