DIELECTRIC FILTER, DIELECTRIC DUPLEXER, AND COMMUNICATION DEVICE

摘要

A dielectric filter includes electrodes formed on both principal surfaces of a dielectric substrate wherein each electrode has a plurality of openings which are formed so that the locations of the plurality of openings formed in one electrode disposed on one principal surface of the dielectric substrate correspond to the locations of the openings formed in the other electrode disposed on the other principal surface of the dielectric substrate. The dielectric substrate is disposed between upper and lower conductive cases. A non-electrode coupling part is formed between openings thereby coupling resonators with each other or coupling a resonator with input/output means. Thus, the invention provides a resonator which can be easily coupled to another resonator or input/output means and also provides a filter having a wide-band characteristic.