Patent ID: 7432786

Claim:
A high frequency filter comprising: a layered substrate including dielectric layers and conductor layers that are alternately stacked; and a first resonator, a second resonator and a third resonator each of which is formed using at least one of the conductor layers inside the layered substrate, wherein: the third resonator is disposed between the first and second resonators; and the first and third resonators are inductively coupled to each other while the second and third resonators are inductively coupled to each other, the high frequency filter further comprising at least one conductor layer for capacitive coupling that is made of at least one of the conductor layers inside the layered substrate and provided for capacitively coupling the first and second resonators to each other, wherein: the at least one conductor layer for capacitive coupling incorporates: a first portion for forming a first capacitor between itself and the first resonator; a second portion for forming a second capacitor between itself and the second resonator; and a third portion having an end connected to the first portion and the other end connected to the second portion, the ends being opposed to each other in a longitudinal direction; and a width of at least part of the third portion is smaller than a width of each of the first portion and the second portion.