Patent ID: 9673498
Date: 2017-06-06
CPC Classifications: H01P,H03H

Claim:
1. A high frequency filter comprising: a multilayer structure including a plurality of insulator layers; a first transmission line configured to transmit an input signal; a second transmission line provided on a same first insulator layer of the plurality of insulator layers that the first transmission line is provided on and configured to be electromagnetically coupled with the first transmission line and transmit an output signal; and a conductor layer configured to define capacitors with the first transmission line and the second transmission line with the first insulator layer in between; wherein a dielectric constant of the first insulator layer that comes in contact with the first transmission line and the second transmission line is higher than a dielectric constant of an insulator layer of the plurality of insulator layers other than the first insulator layer; the second transmission line is provided with an impedance adjuster portion; and the impedance adjuster portion is configured so that, in the first insulator layer, a dielectric constant of a contact portion that comes in contact with a portion of the second transmission line is higher than a dielectric constant of a portion other than the contact portion.