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US 7,479,846 B2Granted
Duplexer
AssigneesFujitsu Media Devices Limited, Fujitsu Limited
InventorsShogo Inoue, Yasuhide Iwamoto, Takashi Matsuda, Masanori Ueda
Life of this patent
Estimating the term…
Abstract
A duplexer that includes: a transmission filter and a reception filter that are connected to a common terminal; and a reactance circuit that is connected to at least one of the transmission filter and the reception filter. The reactance circuit includes an insulating substrate, lumped-constant inductors, and at least one capacitor. The lumped-constant inductors and the capacitor are formed directly on the surface of the insulating substrate.
Claims10
A duplexer comprising:
- a transmission filter and a reception filter that are connected to a common terminal, each of the transmission filter and the reception filter being composed of acoustic wave resonators formed on single substrates, respectively, or both of the transmission filter and the reception filter being composed of acoustic wave resonators formed on a single substrate;
- and
- a reactance circuit that is connected to at least one of the transmission filter and the reception filter,
- the reactance circuit including an insulating substrate, a plurality of lumped-constant inductors, and at least one capacitor, the plurality of lumped-constant inductors and the at least one capacitor being formed directly on a surface of the insulating substrate so that patterned conductive materials of the lumped-constant inductors formed by spiral coils are directly formed on the surface of the insulating substrate, the lumped-constant inductors formed by spiral coils facing only a non-grounded opposite surface of the insulating substrate,
- a chip having the transmission filter and the reception filter or chips respectively having the transmission filter and the reception filter and the insulating substrate being provided on another substrate.
2 more elements
A duplexer comprising:
- a transmission filter and a reception filter that are connected to a common terminal, each of the transmission filter and the reception filter being composed of acoustic wave resonators formed on single substrates, respectively, or both of the transmission filter and the reception filter being composed of acoustic wave resonators formed on a single substrate;
- and
- a reactance circuit that is designed for phase matching and is connected to at least one of the transmission filter and the reception filter,
- the reactance circuit including an insulating substrate and at least one of a lumped-constant inductor formed by a spiral coil and a capacitor, the lumped-constant inductor and the capacitor being formed directly on a surface of the insulating substrate, the lumped-constant inductor formed by a spiral coil facing only a non-grounded opposite surface of the insulating substrate,
- an inductor to be connected to at least one of the transmission filter and the reception filter being formed directly on the surface of the insulating substrate,
- a chip having the transmission filter and the reception filter or chips respectively having the transmission filter and the reception filter and the insulating substrate being provided on another substrate.
3 more elements
Dependencies are inferred from the claim text.