Patent ID: 6872962

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 including a first sub-pattern forming a portion of a first shunt reactance including a first inductance, and a second sub-pattern forming a first portion of a second shunt reactance including a first portion of a second inductance; a fourth ceramic tape layer positioned between said first and second ceramic tape layers with a fourth electrode pattern including a third sub-pattern forming a portion of a third shunt reactance including a third inductance, and a fourth sub-pattern forming a second portion of said second shunt reactance including a second portion of said 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 multiple-pole RF bandpass filter circuit with said second shunt reactance coupled intermediately to said first and third shunt reactance portions, and corresponding portions of said first and third sub-patterns are mutually superimposed.