Patent ID: 6344705
Filing Date: 2002-02-05
Classification: H03H

Abstract:
Surface-acoustic-wave filter with N poles, N being a number greater than or equal to 3 and comprising a set of resonators, characterized in that:the resonators are electrically coupled to form a four-arm electrical bridge; two arms comprising, two identical sub-assemblies E1 and E3 of N1 parallel-connected resonators; two arms comprising two identical sub-assemblies E2 and E4 of N2 parallel-connected resonators; with N1+N2=N; the product of the total static capacitance of the sub-assembly E1 multiplied by the total static capacitance of the sub-assembly E3 bring substantially equal to the product of the total static capacitance of the sub-assembly E2 multiplied by the total static capacitance of the sub-assembly E4, so as to balance the electrical bridge.