Patent ID: 6696904
Filing Date: 2004-02-24
Classification: H01P

Abstract:
A duplexer/diplexer, comprising:at least two filters for a transmission branch and a reception branch; each of said at least two filters comprising a ceramic body in which respective through-bores are arranged, said through bores leading from one side of the ceramic body to the opposite side thereof; and terminal surfaces insulated from a metalization of the ceramic body are provided on the ceramic body for three ports for the capacitative infeed/outfeed of RF signals, wherein: said filters are modularly constructed and connected by a shielding of metal that is applied onto the metalization and the two branches are matched to an identical value of resistance in their passband and offer broadband high-impedance in the stopband of the band neighboring the passband, so that all three ports of the duplexer/diplexer are matched to the value of resistance when in parallel connection of the two branches; and the high impedance of the branches in the stopband is achieved by structuring of the ports and by a metal side structure arranged on a side surface of only one filter, the metal side structure being configured as a line structure of a length necessary to achieve high-impedance in the stopband.