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D. Schwanke, A. Bittner, U. Schmid, M. Harnack:
"Ceramic Substrate Material, Method For The Production And Use Thereof, And Antenna Or Antenna Array";
Patent: U.S.A., No. Us 8,586,178 B2; submitted: 01-18-2011, granted: 11-19-2013.

A method for producing a ceramic substrate material having
a first layer and possibly a further layer is specified. The first
layer comprises at least one first component made of a crystalline
ceramic material and/or a glass material as a matrix
and a second component made of a further crystalline ceramic
material, which is provided in the matrix. An etching step is
performed, mantle areas of the crystals and/or crystal
agglomerates of the second component being etched selectively
in the first layer to generate a cavity structure in the first
layer. The present invention also relates to a corresponding
ceramic substrate material, an antenna or an antenna array,
and the use ofthe ceramic substrate material for an antenna or
an antenna array.