Dielectric material

Claim 1

A LIGHTWEIGHT SANDWICH CONSTRUCTION CAPABLE OF TRANSMITTING HIGH FREQUENCY RADAR SIGNALS COMPRISING: A PLURALITY OF LAYERS OF FIBROUS DIELECTRIC MATERIALS ADHESIVELY UNITED OVER THEIR ENTIRE CONTACTING SURFACE AREAS INTO A THIN SANDWICH UNIT OF SUBSTANTIALLY UNIFORM THICKNESS, AT LEAST ONE OF SAID LAYERS FORMING A LOW DENSITY CORE OF LOW DIELECTRIC CONSTANT AND SUBSTANTIALLY UNIFROM THICKNESS, AND CERTAIN OF SAID LAYERS FORMING OPPOSITELY DISPOSED SKINS FOR SAID CORE SUBSTANTIALLY UNIFORMLY SPACED THEREBY FROM EACH OTHER OVER SUBSTANTIALLY THEIR ENTIRE OPPOSING SURFACE AREAS, SAID CORE LAYER COMPRISING A PLURALITY OF SUBSTANTIALLY NON-HYGROSCOPIC NETTINGS OF SAID DIELECTRIC MATERIALS LAID UP UPON EACH OTHER IN PLANES SUBSTANTIALLY PARALLEL TO THOSE OF SAID SKINS AND BONDED TOGETHER AT THEIR CONTACTING SURFACES BY A SET RESIN WHICH DOES NOT SUBSTANTIALLY EXTEND INTO THE MESH OPENINGS IN EACH OF SAID NETTINGS TO PROVIDE A MULTIPLICITY OF UNFILLED SPACES AND SAID OTHER LAYERS COMPRISING A SUBSTANTIALLY NON-HYGROSCOPIC DIELECTRIC MATERIAL WHICH PROVIDES A PAIR OF CONTINUOUSLY SURFACED OUTER COVERINGS FOR SAID CORE.