FILTER DEVICE, RADIO-FREQUENCY MODULE, AND COMMUNICATION DEVICE: abstract simplified (18210136)

• This abstract for appeared for patent application number 18210136 Titled 'FILTER DEVICE, RADIO-FREQUENCY MODULE, AND COMMUNICATION DEVICE'

Simplified Explanation

The abstract describes a filter device that consists of a filter substrate and a ladder filter. The ladder filter includes components such as inductors and acoustic wave resonators, specifically a series arm resonator and a parallel arm resonator. The inductors are connected to the acoustic wave resonators. The ladder filter has a wider range of frequencies that it allows to pass through compared to the resonance range of the acoustic wave resonators. The series arm resonator is made of a certain type of piezoelectric substrate, while the parallel arm resonator is made of a different type of piezoelectric substrate.

Original Abstract Submitted

A filter device includes a filter substrate and a ladder filter at the filter substrate. The ladder filter includes at least one inductor and acoustic wave resonators including a series arm resonator and a parallel arm resonator. The at least one inductor is coupled to the acoustic wave resonators. A pass bandwidth of the ladder filter is larger than a resonance bandwidth of at least one of the acoustic wave resonators. The series arm resonator includes a first piezoelectric substrate. The parallel arm resonator includes a second piezoelectric substrate that is different from the first piezoelectric substrate.