Dielectric duplexer, and communication apparatus

摘要

A dielectric duplexer contains a substantially-rectangular-parallelepiped-shaped dielectric block (1). The dielectric block (1) includes plated through holes (2a - 2f) having inner conductors (3a - 3f) formed thereon. An outer conductor (4) is formed on an exterior surface of the dielectric block (1). An input/output terminal (5) is formed by an outer-conductorless portion (6) separating the input/output terminal (5) from the outer conductor (4). An antenna terminal (7) is formed between the plated through holes (2a -2f) and is defined by an outer-conductorless portion (6) extending from a short circuit face of the dielectric block (I) to a mounting surface thereof. An antenna excitation hole (9) is formed as a through-hole in the same axial direction as that of the plated through holes (2a-2f) in the dielectric block (1). The antenna excitation hole (9) contains an electrode which is coupled to the antenna terminal (7). Two electrodeless portions (12a, 12b), each having a predetermined shape, are formed between open edges of two plated through holes (2c, 2d) and a top face of the dielectric block (1).