Patent ID: 7245195
Filing Date: 2007-07-17
Classification: H01P

Abstract:
1. A coplanar waveguide filter comprising: a dielectric substrate, at least one coplanar waveguide resonator formed on one surface of said dielectric substrate by a first center conductor line and first and second ground conductors which are formed on the dielectric substrate on opposite sides of the first center conductor line, respectively, said first and second ground conductors defining therebetween a first ground conductor spacing, and a coplanar input/output terminal section which is formed on said one surface of the dielectric substrate by a second center conductor and third and fourth ground conductors formed integrally with said first and second ground conductors, respectively, and disposed on opposite sides of the second center conductor, respectively, said third and fourth ground conductors defining therebetween a second ground conductor spacing; and a capacitive coupler formed by end portions of said first and second center conductor lines expanded in width direction thereof and opposed with each other, for making capacitive coupling between the coplanar input/output terminal section and the coplanar waveguide resonator; wherein one of the first ground conductor spacing and a width of the first center conductor line of the coplanar waveguide resonator is greater than a corresponding one of the second ground conductor spacing and a width of the second center conductor line of the input/output terminal section.