Back to results
US 5,408,244 AGranted
Radome wall design having broadband and mm-wave characteristics
AssigneeNorton Company
InventorS. Benjamin Mackenzie
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNorton Company
InventorS. Benjamin Mackenzie
Estimating the term…
The invention describes a multi-layer radome construction which is termed a D-sandwich and allows excellent transmission efficiency over areas of the entire spectrum of DC to at least 100 GHz. The radome wall construction comprises a core layer of low dielectric constant material bounded by intermediate layers of high dielectric constant material which themselves are bounded by additional layers of low dielectric constant material. Each of the low dielectric constant layers has a substantial electrical effect upon the performance of the radome as well as being a high strength material which provides substantial structural rigidity to the radome. The radome may be further provided with one or more protective surface coatings for certain environmental conditions, without destroying the desired transmission characteristics of the radome. The dielectric constant, loss tangent and thickness of the various materials in the multi-layer construction of the invention are designed to provide excellent transmission efficiency over the frequency and angular range desired. The thicknesses of the various layers in the multi-layer construction are also designed to minimize insertion and return losses thereby minimizing loading of radar transmitters as well as being relatively insensitive to aspect angle and arbitrary wave polarization.
A radome having a multi-layer laminate construction comprising a core layer, two outermost layers, and two intermediate layers, each core, outermost, and intermediate layer providing substantial structural rigidity to the radome, and each intermediate layer being located between the core layer and one of the outermost layers, wherein the two intermediate layers have dielectric constants which are higher than the low dielectric constants of each of the core layer and the two outermost layers wherein the dielectric constant of each of the core and outermost layers is at least about 1.5, and wherein each of the low dielectric constant layers has a substantial electrical effect upon the performance of the radome.
A radome which efficiently permits electromagnetic energy over a broad frequency spectrum to be transmitted therethrough which comprises:
A radome comprising a laminate construction of multiple layers of materials having dielectric constants, wherein the dielectric constants of the sequential layers of the radome from outermost to innermost is in an order selected from the group consisting of:
A radome having an at least five layer laminate construction comprising a core layer and two outermost layers each providing substantial rigidity to the radome, and each layer being constructed of a material having a relatively low dielectric constant of at least about 1.5 and a thickness of from about 0.01 to 0.1 inch, each relatively low dielectric constant layer being separated from other relatively low dielectric constant layers by a layer of material having a higher dielectric constant than that of the relatively low dielectric constant materials, said higher dielectric constant layers each having a thickness of from about 0.005 to 0.02 inch.
Dependencies are inferred from the claim text.