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.

公开(公告)号：DE50114246D1

公开(公告)日：2008-10-02

申请号：DE50114246

申请日：2001-02-02

Applicant: EPCOS AG

Inventor： DR BECKERING CLAUDIA ,  BERGMANN ANDREAS ,  JOHANNES THOMAS

IPC: H03H9/64 ,  H03H9/145

Abstract: The invention relates to a TMR filter that requires less space and still has filter characteristics suitable for mobile radio telecommunications applications. At least two TMR individual channels are connected to one another in parallel. According to the invention, selection is improved by means of resonators. Appropriately mounted excitation cells are distributed over the converter according to a distribution function and involving a maximum that is situated in the centre of the inter-digital converter. Inactive finger groups are provided between individual or groups of excitation cells without overlapping.

公开(公告)号：DE10009511A1

公开(公告)日：2001-08-30

申请号：DE10009511

申请日：2000-02-29

Applicant: EPCOS AG

Inventor： EDER CLAUDIA ,  BERGMANN ANDREAS ,  JOHANNES THOMAS

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

Abstract: The transversal mode resonance (TMR) filter has two electrically parallel connected TMR single tracks, each with at least two acoustically coupled half-tracks with a resonator containing an interdigital converter with stimulation cells and inactive finger groups. The stimulation cells are distributed in a single track so that the maximum density occurs in the center and the minima at the edge. The stimulation cells are weighted.