公开(公告)号：DE10012129A1

公开(公告)日：2001-10-11

申请号：DE10012129

申请日：2000-03-13

Applicant: EPCOS AG

Inventor： MUELLER PETER ,  OSTNER HELMUT ,  KREMS TOBIAS

IPC: H03H9/64 ,  H03H9/72 ,  H03H9/145 ,  H04B1/44

Abstract: The duplexer is based on surface wave filters elements with first and second Dual Mode SAW filters (F1,F2) as input and transmission filters and a first surface wave resonator (Res) in series between the first filter and the antenna. The resonator blocks in the transmission region of the second filter and is optimally conducting in that of the first filter. Connections (1,2,5,7) of the first and second filters are inductively coupled.

公开(公告)号：DE59704141D1

公开(公告)日：2001-08-30

申请号：DE59704141

申请日：1997-08-28

Applicant: EPCOS AG

Inventor： MUELLER PETER ,  PITSCHI MAXIMILIAN

IPC: H03H9/145 ,  H03H9/25 ,  H03H9/64 ,  H03H9/72

Abstract: A reactance filter, particularly in a branching circuit (ladder type),with surface wave resonators wherein omission weighted normal finger transducers are employed between reflectors such that the arrangement and plurality of the active fingers of the interdigital transducer are particularly formed for changing the capacitance relationship (static to dynamic capacitance) such that a narrow filter bandwidth is achieved.