THREE-TERMINALS TYPE FILTER AND MANUFACTURING METHOD THEREOF

摘要

A three-terminals type filter and a manufacturing method thereof are provided to control a cut-off frequency by freely setting a capacitance element of a varistor. A three-terminals type filter includes a first bead(11), a second bead(12), and a varistor(VT). The first bead(11) is arranged to be connected to a first terminal in series between the first terminal and a node. The second bead(12) is arranged to be connected to a second terminal in series between the node and the second terminal. The varistor(VT) is arranged to be connected to a ground in series between the node and the ground. The varistor(VT) is arranged to be connected to the first and second beads(11,12) in parallel. A resistor is applied to the first and second beads(11,12).