| US 7,498,899 B2 | ||
| Duplexer with filters including film bulk acoustic resonators | ||
| Masafumi Iwaki, Kawasaki (Japan); Tokihiro Nishihara, Kawasaki (Japan); Jun Tsutsumi, Kawasaki (Japan); Shinji Taniguchi, Kawasaki (Japan); Takeshi Sakashita, Kawasaki (Japan); Tsuyoshi Yokoyama, Kawasaki (Japan); Masanori Ueda, Yokohama (Japan); and Tsutomu Miyashita, Yokohama (Japan) | ||
| Assigned to Fujitsu Media Devices Limited, Yokohama (Japan); and Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Sep. 28, 2005, as Appl. No. 11/236,861. | ||
| Claims priority of application No. 2004-282848 (JP), filed on Sep. 28, 2004. | ||
| Prior Publication US 2006/0066419 A1, Mar. 30, 2006 | ||
| Int. Cl. H03H 9/70 (2006.01); H03H 9/54 (2006.01) | ||
| U.S. Cl. 333—133 [333/189] | 6 Claims |
| 1. A duplexer, comprising:
first and second filters including film bulk acoustic resonators (FBARs) arranged in a ladder form;
first and second integrated-passive device chips (IPDs) provided between a common terminal and the first and second filters;
and
a substrate on which the first and second filters and the first and second IPDs are mounted,
the substrate including conductive patterns that realize inductances connected between the first and second filters and ground,
and
the first and second IPDs including respective inductors connected to the first and second filters,
wherein the first and second IPDs include an inductor common to the first and second filters.
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