Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

H - Electricity

03

H

H03H 9/64 (2006.01) H03H 9/02 (2006.01)

Patent

CA 2325434

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.

L'invention concerne un filtre acoustique à ondes de surface, à diaphonie capacitive et inductive compensée entre des transformateurs d'entrée et de sortie intergidités adjacents. Ces transformateurs (20 ; 23) sont divisés en transformateurs partiels (d, d' ; e, e') et le guidage de leurs contacts (24, 25 ; 26, 27) est modifié de sorte que les directions de flux (H, H') des couplages magnétiques entre les transformateurs partiels adjacents soient opposées, de sorte que le flux magnétique total induit soit égal à zéro. Les transformateurs partiels sont montés en série ou en parallèle de sorte que, lors d'un fonctionnement symétrique, les capacités de diaphonie entre des contacts et des surfaces de transformateurs adjacents soient compensées au niveau de la porte correspondante.

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