Patent ID: 6881895

Claim:
An apparatus including a radio frequency (RF) filter within a multilayered low temperature co-fired ceramic (LTCC) substrate, comprising: a first ceramic tape layer with a first electrode pattern forming a first RF ground plane; a second ceramic tape layer with a second electrode pattern forming a second RF ground plane; a third ceramic tape layer positioned between said first and second ceramic tape layers with a third electrode pattern of which at least a first portion is generally geometrically serpentine and forms a portion of a first reactance including a first inductance; a fourth ceramic tape layer positioned between said first and second ceramic tape layers with a fourth electrode pattern of which at least a first portion is generally geometrically serpentine and forms a portion of a second reactance including a second inductance; and a plurality of conductive vias coupling selected respective portions of said first, second, third and fourth electrode patterns; wherein said third and fourth electrode patterns together form at least a portion of a RF bandpass filter circuit, corresponding sub-portions of said first portions of said third and fourth electrode patterns are mutually superimposed, and said first and second inductances together produce a mutual inductance which remains substantially constant substantially independently of selected variations in said mutual superimposition.