초록 ▼

An electromagnetic energy absorber provides a base having an electrically conductive ground plane positioned thereover. At least one dielectric and one impedance layer are positioned over the ground plane or surface on a side thereof opposite the base. An external most dielectric skin seals the stru

An electromagnetic energy absorber provides a base having an electrically conductive ground plane positioned thereover. At least one dielectric and one impedance layer are positioned over the ground plane or surface on a side thereof opposite the base. An external most dielectric skin seals the structure. Additional alternating dielectric and impedance layers can be positioned over the first dielectric and impedance layers. The impedance layer, can be formed from a resistive sheet formed into a broken pattern that can comprise a series of geometric shapes spaced from each other. The broken pattern is sized to vary the specific impedance of the sheet. The resistive sheet can be combined with a series of composite dielectric layers to form an integral composite structure. Three resistive sheet layers can be provided with predetermined spacings from the ground surface and predetermined impedance to effect broadband absorption characteristics.

대표청구항 ▼

A broadband electromagnetic energy absorber comprising: a conductive ground surface; a first dielectric layer positioned over the ground surface; a first resistive layer defining a first predetermined broken pattern thereon positioned over the first dielectric layer; a second dielectric layer positi

A broadband electromagnetic energy absorber comprising: a conductive ground surface; a first dielectric layer positioned over the ground surface; a first resistive layer defining a first predetermined broken pattern thereon positioned over the first dielectric layer; a second dielectric layer positioned over the first resistive layer; a second resistive layer defining a second predetermined broken pattern thereon positioned over the second dielectric layer; a third dielectric layer positioned over the second resistive layer; a third resistive layer defining a third predetermined broken pattern thereon positioned over the third resistive layer; and a dielectric skin layer, comprising an outermost layer, positioned over the third resistive layer, wherein each of the first resistive layer, the second resistive layer and the third resistive layer are spaced from the ground surface so that the absorber absorbs electromagnetic energy over a broad frequency range.