FILTER

摘要

A filter exhibiting excellent filter characteristics and having a small number of stages. A dielectric substrate (1) has one side connected with a surface conductor (2) and the opposite side connected with a rear surface conductor (3). Two rows of via holes (4) for connecting the surface conductor (2) with the rear surface conductor (3) are made in the direction of the propagation of a signal. A slit (6) is made in the surface conductor (2) above a resonator at the center among a plurality of resonators by removing the conductor partially. The slit (6) extends in a direction orthogonal to the signal propagation direction. Slits (7, 8) are made in the surface conductor (2) above resonators at the opposite ends. A coplanar line (9) mounted on the surface conductor (2) is connected with the slit (7).