Patent ID: 9240768
Filing Date: 2016-01-19
CPC Classification: H03H

Claim Text:
1. A duplexer including a transmission filter and a reception filter, a passband of one filter of the transmission filter and the reception filter being lower than a passband of the other of the transmission filter and the reception filter, wherein: each of the transmission filter and the reception filter includes a series resonator and a parallel resonator connected in a ladder shape, first resonators that are the series resonator of the one filter and the parallel resonator of the other filter and are formed on a first chip, second resonators that are the series resonator of the other filter and the parallel resonator of the one filter and are formed on a second chip that is different from the first chip, and wherein a temperature coefficient of frequency of the first resonators is smaller than a temperature coefficient of frequency of the second resonators.