公开(公告)号：DE59913935D1

公开(公告)日：2006-11-30

申请号：DE59913935

申请日：1999-03-22

Applicant: EPCOS AG

Inventor： ALI-HACKL MARKUS ,  FREISLEBEN STEFAN ,  JOHANNES THOMAS ,  BAIER THOMAS ,  BAUERNSCHMITT ULRICH ,  ROESLER ULRIKE

IPC: H03H9/145 ,  H03H9/64 ,  H03H9/00 ,  H03H9/02

Abstract: A surface acoustic wave filter having compensated capacitive and inductive crosstalk between adjacent IDT input and output transducers includes electromagnetically coupled transducers split into partial transducers. The routing of the partial transducer pads is modified such that the flux directions of the magnetic couplings between the adjacent partial transducers are oppositely directed so that the total induced magnetic flux is zero. The partial transducers are connected in series or in parallel such that, in the case of symmetric operation, the crosstalk capacitances between adjacent pads and transducer surfaces are balanced at the corresponding port.

公开(公告)号：CA2325434A1

公开(公告)日：1999-09-30

申请号：CA2325434

申请日：1999-03-22

Applicant: EPCOS AG

Inventor： JOHANNES THOMAS ,  BAIER THOMAS ,  BAUERNSCHMITT ULRICH ,  ROSLER ULRIKE ,  ALI-HACKL MARKUS ,  FREISLEBEN STEFAN

IPC: H03H9/145 ,  H03H9/00 ,  H03H9/02 ,  H03H9/64

Abstract: The present invention relates to a surface-wave acoustic filter having a capacitive and inductive cross-talk which is compensated between adjacent and interdigitated input and output transformers. These transformers (20; 23) are divided into partial transformers (d, d'; e, e') and the guidance of their pads (24, 25; 26, 27) is modified so that the magnetic couplings between adjacent partial transformers have opposite flow directions (H, H') and so that the total magnetic flow induced is equal to zero. The partial transformers are mounted in series or in parallel so that during a symmetrical operation, the cross-talk capacities between adjacent pads and transformer surfaces are compensated at the corresponding gate.