Bandpass filter within a multilayered low temperature co-fired ceramic substrate

A bandpass filter, comprising:

• an input node;
• an output node;
• a first substrate with a first conductive plate forming a first RF ground plane;
• a second substrate, comprising:
• a first serpentine conductive trace forming a first inductor and coupled to the input node;
• a second conductive plate coupled to the first serpentine conductive trace and substantially overlapping the first conductive plate;
• a second serpentine conductive trace forming a second inductor and coupled to the second conductive plate;
• a third serpentine conductive trace forming a third inductor;
• a third conductive plate, substantially overlapping the first conductive plate;
• a fourth serpentine conductive trace forming a fourth inductor and coupled to the third conductive plate;
• and
• a fifth serpentine conductive trace forming a fifth inductor and coupled to the third conductive plate and the output node;
• a third substrate, comprising:
• a fourth conductive plate, substantially overlapping the second conductive plate and coupled to the second inductor;
• and
• a fifth conductive plate, substantially overlapping the third conductive plate and coupled to the fourth conductive plate and the fourth inductor;
• and
• a fourth substrate with a sixth conductive plate to form a second RF ground plane, the fourth and fifth conductive plates substantially overlapping the sixth conductive plate;
• wherein the first, third and fifth inductors are coupled to one of the first and second RF ground planes.