Electroacoustic bandpass filter having smoothed insertion loss

摘要

A bandpass filter operates with electroacoustically active components. The bandpass filter includes a first transducer segment having a spike in the insertion loss at a first frequency f1 and a second transducer segment having a spike in the insertion loss at a second frequency f2≠f1. The frequencies f1 and f2 are chosen such that the insertion loss is smoothed.

主权项

1. An electroacoustic bandpass filter comprising:
a piezoelectric layer having an acoustic track; and a metallization layer arranged on the piezoelectric layer and in the acoustic track; wherein the acoustic track comprises a first section and a second section; wherein in the first section, a first transducer segment is formed in the metallization layer, the first transducer segment forming a resonance at a first frequency f1 and generating a spike in insertion loss; wherein in the second section, a second transducer segment is formed in the metallization layer, the second transducer segment forming a resonance at a second frequency f2 and generating a spike in insertion loss, where f2≠fl; and wherein the frequencies f1 and f2 are chosen such that the manifestation of the spikes in insertion loss of the filter is reduced compared with the manifestation of the spikes of the individual transducer segments.