Patent ID: 8564380

Claim:
A central conductor assembly for use in a non-reciprocal circuit device comprising a first inductance element and a first capacitance element constituting a first parallel resonance circuit between a first input/output port and a second input/output port, and a second inductance element and a second capacitance element constituting a second parallel resonance circuit between the second input/output port and the ground, said central conductor assembly comprising said first and second inductance elements; at least a first central conductor constituting said first inductance element being formed by series-connecting ends of first lines and second lines formed on a first main surface of a first magnetic layer of a laminate, comprising pluralities of magnetic layers, to third lines formed on a second magnetic layer disposed below the first magnetic layer in said laminate through via-holes; a second central conductor constituting said second inductance element being formed on the first main surface of the first magnetic layer of said laminate, such that the second central conductor extends between said first and second lines and crosses said third lines via said first magnetic layer; and first terminal electrodes connected to the other ends of the first lines of said first central conductors through via-holes formed in the laminate, third terminal electrodes connected to the other ends of the second lines of said first central conductors through via-holes formed in the laminate, and second terminal electrodes connected to both ends of said second central conductor through via-holes formed in the laminate being formed on a second main surface of said laminate, wherein a set of the first lines is disposed separately from a set of the second lines, and the first lines and the second lines are similarly oriented.