Method for producing a batch of acoustic wave filters

A method for a batch production of a set of N filters Fi, where 1≤i≤N each acoustic wave filter comprising Mi actual acoustic wave resonators Rij, where 1≤j≤Mi, and comprising center frequencies fi and bandwidths li, which are different for at least two of them, comprising the following steps:

• synthesizing N theoretical filters, each filter being defined on the basis of a set of Mi theoretical resonator(s), where 1≤i≤N, such that said theoretical filters have said center frequencies fi and said bandwidths li, the theoretical resonators of each filter respectively having a triplet of parameters:
• a theoretical static capacitance C0ij,eq where 1≤j≤Mj, a theoretical resonant frequency ωrij,eq and a theoretical antiresonant frequency ωaij,eq, these parameters being grouped into one or more subsets;
• determining a reference resonator structure for each subset such that said reference resonator naturally has a resonant frequency ωr,ref that is lower than the lowest of the theoretical resonant frequencies ωrij,eq of said subset and an antiresonant frequency ωa,ref that is higher than the highest of the theoretical antiresonant frequencies ωaij,eq of said subset;
• determining, subsequent to the preceding step for each theoretical resonator of each subset, an elementary building block comprising an intermediate resonator R′ij, at least one of a parallel reactance Xpij associated with the actual acoustic wave resonators Rij to form the elementary building blocks and a series reactance Xsij associated with the actual acoustic wave resonators Rij to form the elementary building blocks, the intermediate resonator R′ij having a static capacitance C0ij, the resonant frequency ωr,ref and the antiresonant frequency ωa,ref, parameters of at least one of the static capacitance C0ij, the parallel reactance Xpij and the series reactance Xsij being defined such that the elementary building block has the static capacitance that is equal to the theoretical static capacitance C0ij,eq, the resonant frequency that is equal to the theoretical resonant frequency ωrij,eq and the antiresonant frequency that is equal to the theoretical antiresonant frequency ωaij,eq;
• determining geometrical dimensions of the actual acoustic wave resonators of the filters base on geometrical dimensions of said reference resonator structure such that they respectively have the static capacitance C0ij of the intermediate resonator R′ij;
• producing each of said actual acoustic wave resonators.