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US 2018/0123556 A1Published application
Multiplexer, high-frequency front end circuit, and communication apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorYuichi TAKAMINE
Life of this patent
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Abstract
A multiplexer is provided on a mounting substrate and includes a duplexer with first and second bandpass filters, and at least one bandpass filter other than the duplexer. The first and second bandpass filters respectively include first and second multilayer bodies that are different components. Configurations of the first and second multilayer bodies are different from each other such that a frequency range of high-order mode spurious radiation generated in the duplexer and a pass band of the bandpass filter other than the duplexer is different from each other.
Claims20
A multiplexer which is provided on a mounting substrate,
- the multiplexer comprising:
- an antenna terminal;
- and
- a plurality of bandpass filters that are commonly connected to the antenna terminal and have different pass bands;
- wherein
- the plurality of bandpass filters include first and second bandpass filters including first and second piezoelectric substrates and at least one bandpass filter other than the first and second bandpass filters, and the first and second bandpass filters define a duplexer;
- the first bandpass filter includes a first multilayer body in which the first piezoelectric substrate is laminated on a first support substrate including a first high acoustic velocity member having an acoustic velocity of propagating bulk waves, which is higher than an acoustic velocity of elastic waves propagating in the first piezoelectric substrate, and a first IDT electrode is laminated on the first piezoelectric substrate;
- the second bandpass filter includes a second multilayer body in which the second piezoelectric substrate is laminated on a second support substrate including a second high acoustic velocity member having an acoustic velocity of propagating bulk waves, which is higher than an acoustic velocity of elastic waves propagating in the second piezoelectric substrate, and a second IDT electrode is laminated on the second piezoelectric substrate;
- the first bandpass filter and the second bandpass filter are different components on the mounting substrate;
- and
- a configuration of the first multilayer body and a configuration of the second multilayer body are different from each other such that frequency ranges of high-order mode spurious radiation which is generated in the first and second bandpass filters and a pass band of the band pass filter other than the first and second bandpass filters among the plurality of bandpass filters are different from each other.
8 more elements
A multiplexer, comprising:
- an antenna terminal;
- and
- a plurality of bandpass filters that are commonly connected to the antenna terminal and have different pass bands;
- wherein
- the plurality of bandpass filters include first and second bandpass filters including first and second piezoelectric substrates and at least one bandpass filter other than the first and second bandpass filters, and the first and second bandpass filters define a duplexer;
- the first bandpass filter includes a first multilayer body in which a first low acoustic velocity film having an acoustic velocity of propagating bulk waves, which is lower than an acoustic velocity of elastic waves propagating in the first piezoelectric substrate, is laminated on a first high acoustic velocity substrate having an acoustic velocity of propagating bulk waves, which is higher than the acoustic velocity of the elastic waves propagating in the first piezoelectric substrate, the first piezoelectric substrate is laminated on the first low acoustic velocity film, and a first IDT electrode is laminated on the first piezoelectric substrate, and the first bandpass filter is a reception filter having a pass band of equal to or higher than about 1930 MHz and equal to or lower than about 1995 MHz;
- the second bandpass filter includes a second multilayer body in which a second low acoustic velocity film having an acoustic velocity of propagating bulk waves, which is lower than an acoustic velocity of elastic waves propagating in the second piezoelectric substrate, is laminated on a second high acoustic velocity substrate having an acoustic velocity of propagating bulk waves, which is higher than the acoustic velocity of the elastic waves propagating in the second piezoelectric substrate, the second piezoelectric substrate is laminated on the second low acoustic velocity film, and a second IDT electrode is laminated on the second piezoelectric substrate, and the second bandpass filter is a transmission filter having a pass band of equal to or higher than about 1850 MHz and equal to or lower than about 1915 MHz;
- and
- a thickness of the first piezoelectric substrate is larger than a thickness of the second piezoelectric substrate.
6 more elements
Dependencies are inferred from the claim text.