Patent ID: 6166612
Filing Date: 2000-12-26
Classification: H01P

Abstract:
A coplanar line filter, comprising:a dielectric substrate comprising a substantially flat surface;a plurality of .lambda./4 coplanar resonators provided entirely on said flat surface of said dielectric substrate, each of said plurality of .lambda./4 coplanar resonators comprising: a first center conductor having electrical length corresponding to a quarter wavelength; and a ground conductor provided entirely on said flat surface with a gap from said first center conductor;a capacitive coupling portion comprising a gap provided between said first center conductors of a pair of said .lambda./4 coplanar resonators; andan inductive coupling portion, comprising a guide conductor which electrically connects said first center conductor and ground, provided at a joint portion of a pair of said .lambda./4 coplanar resonators;said plurality of .lambda./4 coplanar resonators being connected in series with said capacitive coupling portion and said inductive coupling portion provided alternately.