Radio frequency filter including high aspect ratio bulk acoustic wave resonators

An electronic device module comprising a radio frequency filter including a plurality of series arm bulk acoustic wave resonators connected in series between an input and an output of the filter, and a plurality of shunt bulk acoustic wave resonators connected between nodes between adjacent series arm bulk acoustic wave resonators and ground, at least one of the plurality of series arm bulk acoustic wave resonators having a greater aspect ratio than at least one of the plurality of shunt bulk acoustic wave resonators.

A multiplexer including a plurality of radio frequency filters, at least one of the plurality of radio frequency filters comprising:

• a plurality of series arm bulk acoustic wave resonators connected in series between an input and an output of the filter;
• and
• a plurality of shunt bulk acoustic wave resonators connected between nodes between adjacent series arm bulk acoustic wave resonators and ground, at least one of the plurality of series arm bulk acoustic wave resonators having a greater aspect ratio than at least one of the plurality of shunt bulk acoustic wave resonators.