Patent ID: 7576965

Claim:
A surge absorption element, comprising: an inductor section that comprises a first coil one end of which is connected to a first input terminal; a second coil one end of which is connected to a first output terminal and the other end of which is connected to the other end of the first coil; a third coil one end of which is connected to a second input terminal; and a fourth coil one end of which is connected to a second output terminal and the other end of which is connected to the other end of the third coil; a first surge absorption section that comprises a first internal electrode that is connected to a first interconnect between the first coil and the second coil of the inductor section; a second internal electrode that faces the first internal electrode and is connected to a reference terminal; and a first surge absorption layer that is interposed between the first internal electrode and the second internal electrode; and a second surge absorption section that comprises a third internal electrode that is connected to a second interconnect between the third coil and the fourth coil of the inductor section; a fourth internal electrode that faces the third internal electrode and is connected to the reference terminal; and a second surge absorption layer that is interposed between the third internal electrode and the fourth internal electrode, wherein the surge absorption element is constituted such that, when opposite-phase signals are applied to the first and second input terminals, the first, second, third, and fourth coils are in a positive magnetically coupled state with respect to one another, so as to mutually strengthen magnetic fields thereof, and wherein coupling coefficients induced by the first, second, third and fourth coils are established so that image impedance of the surge absorption element is independent of a frequency of the applied opposite-phase signals.