Composite ceramic substrate for micro-fluid ejection head

A composite cermaic substrate for receiving an ejection head chip for micro-fluid ejection head comprising:

• a previously fired ceramic base having a substantially planarized first surface and at least one fluid supply slot therethrough;
• and
• a low temperature co-fired ceramic (LTCC) tape layer bundle comprising at least two LTCC tape layers, the LTCC tape layer bundle being attached to the ceramic base at an interface between the LTCC tape layer bundle and the substantially planarized first surface of the ceramic base and having at least one chip pocket thereing, the ceramic base comprising at least about 92% weight percent alumina,
• wherein at least one of the LTCC tape layers comprises a plurality of conductors for providing electical connections to the ejection head chip in the chip pocket.