| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a miniaturized dielectric filter, a radio communication module using the same and a radio communication device. <P>SOLUTION: The dielectric filter includes a dielectric block 10 and a shield conductor 20 forming a cavity by surrounding the dielectric block 10. The dielectric block 10 includes a recess 11 formed at the center in a longitudinal direction and a protrusion protruding to a first direction perpendicular to the longitudinal direction. The dielectric filter forms a pass band by use of: a first resonance mode in which the whole of electric field directions inside the dielectric block 10 are parallel to a second direction perpendicular to both the longitudinal direction and the first direction; a second resonance mode in which the electric field directions inside the dielectric block 10 are parallel to the second direction, with opposite directions between one side and the other side of the dielectric block 10 in the longitudinal direction; and a third resonance mode in which the electric field directions inside the dielectric block 10 are parallel to the first direction. <P>COPYRIGHT: (C)2013,JPO&INPIT |
