Patent ID: 7116188
Filing Date: 2006-10-03
Classification: H01P

Abstract:
1. An antenna duplexer, comprising a filter including a plurality of resonators, the resonators being coupled to one another by electromagnetic-field coupling, wherein non-adjacent resonators of said plurality of resonators are electrically coupled to each other with a bypass circuit formed of a bypass capacitor and a non-grounded transmission line, the bypass circuit functioning as a capacitive coupling parallel to a magnetic-field bypass coupling between non-adjacent resonators; wherein adjacent resonators of said plurality of resonators are electrically coupled to each other with a series circuit formed of an inter-stage capacitor and a transmission line, each series circuit functioning as a capacitive coupling parallel to a magnetic-field coupling between the adjacent resonators; wherein the plurality of resonators and the transmission line are formed inside a dielectric body; and wherein the filter is used as one of or both of filters on transmission and reception sides.