Samsung Electronics Co., Ltd.

Sang-chul Sul

In-sang Song

Yun-kwon Park

Joo-ho Lee

Chul-soo Kim

Hae-seok Park

Duck-hwan Kim

Kuang-woo Nam

Seok-chul Yun

Sang-hun Lee

A resonator including a substrate, and a resonating unit having an active region that causes resonances and a non-active region that does not cause resonances, and having a first electrode, a piezoelectric film, and a second electrode layered in turn on the substrate. At least one of the first and the second electrodes is formed, so that at least a portion of a non-active region portion thereof has a thickness different from that of an active region portion thereof.

Resonator and fabrication method thereof

A duplexer is provided. The duplexer includes a first band pass filter (BPF) coupled to a first signal port and a second signal port; and a second BPF coupled to the first signal port and a third signal port, each of the first BPF and the second BPF including a first resonance circuit which comprises a plurality of first resonators coupled in series; a second resonance circuit which comprises a plurality of second resonators coupled in series; and a third resonance circuit which comprises a plurality of third resonators coupled in parallel and formed in divided lines coupling the first and second resonance circuits.

Duplexer

Growing community of inventors

Yongin-si, South Korea

Sang-chul Sul