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公开(公告)号：US20220116021A1
公开(公告)日：2022-04-14
申请号：US17556233
申请日：2021-12-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Jin YOKOYAMA
Abstract: A filter device includes a piezoelectric substrate including a high acoustic velocity material layer and a piezoelectric layer, and series and parallel arm resonators on the piezoelectric substrate. The parallel arm resonator includes a first IDT electrode on the piezoelectric substrate, and the series arm resonator includes a second IDT electrode on the piezoelectric substrate. First and second busbars of the first IDT electrode include opening formation regions, and an occupancy ratio of areas of openings in the first and second busbars of the first IDT electrode is greater than an occupancy ratio of areas of openings in first and second busbars of the second IDT electrode. In the first and second IDT electrodes, low acoustic velocity regions sandwich a central region. A high acoustic velocity region is provided in the opening formation region of each of the first and second busbars in the first IDT electrode.
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Patent Agency Ranking
公开(公告)号：US20210083642A1
公开(公告)日：2021-03-18
申请号：US17108042
申请日：2020-12-01
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Jin YOKOYAMA
Abstract: A multiplexer includes an antenna terminal, first to third filters with different passbands, and first and second phase circuits that adjust the phase of a passing signal. The first filter is connected to the antenna terminal. The second filter is connected to the antenna terminal with the first phase circuit provided between the second filter and the antenna terminal. The third filter is connected to a connection node between the first phase circuit and the second filter with the second phase circuit provided between the third filter and the connection node. In the second filter, an unwanted wave is generated in the first passband of the first filter. The first phase circuit adjusts the phase to provide an impedance in an open state in the first passband at the antenna terminal. The second phase circuit adjusts the phase to provide the impedance in a short-circuited state in the first passband at the connection node.
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公开(公告)号：US20210336639A1
公开(公告)日：2021-10-28
申请号：US17368958
申请日：2021-07-07
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Motoji TSUDA , Yusuke NANIWA , Morio TAKEUCHI , Atsushi HORITA , Jin YOKOYAMA , Sho MATSUMOTO , Syunsuke KIDO , Yukiya YAMAGUCHI , Hiroyuki KANI
Abstract: A radio-frequency module includes a transmission path which has one end connected to a transmission terminal and on which a transmission signal in Band A is transmitted; a reception path (62) which has one end connected to a reception terminal (120B) and on which a reception signal in Band B is transmitted; a reception path (63) which has one end connected to a reception terminal (120C) and on which a reception signal in Band C is transmitted; a switch (11) having a common terminal (11a) and selection terminals (11b and 11c); and a switch (12) having a common terminal (12a) and selection terminals (12b and 12c).
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公开(公告)号：US20210314010A1
公开(公告)日：2021-10-07
申请号：US17351867
申请日：2021-06-18
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Motoji TSUDA , Yukiya YAMAGUCHI , Sho MATSUMOTO , Hiroyuki KANI , Atsushi HORITA , Morio TAKEUCHI , Yusuke NANIWA , Jin YOKOYAMA
Abstract: A radio-frequency module includes a switch performing switching of the connection between a common terminal and a selection terminal, a reception filter having a reception band in a band A as a passband, a transmission filter that has a transmission band in a band B as a passband and has an output terminal connected to the selection terminal, a filter that has the transmission band in a band B as an attenuation band and has an input terminal connected to the selection terminal, a reception path which connects the selection terminal and an input terminal of the reception filter and on which the filter is disposed, a bypass path which connects the selection terminal and the input terminal of the reception filter and on which no filter is disposed, and a transmission path which connects the selection terminal and a transmission terminal and on which the transmission filter is disposed.
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公开(公告)号：US20170093372A1
公开(公告)日：2017-03-30
申请号：US15378289
申请日：2016-12-14
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Jin YOKOYAMA
CPC classification number: H03H9/6483 , H03H9/25 , H03H9/64 , H03H9/6423 , H03H9/6489 , H03H9/725
Abstract: A ladder filter includes a series arm resonator and parallel arm resonators including a first parallel arm resonator defining a pass band together with the series arm resonator, and a second parallel arm resonator. Each of dimensions, in an overlap width direction, of gap regions between the overlap width region and first and second busbars in the second parallel arm resonator is larger than a dimension, in the overlap width direction, of a gap region in the first parallel arm resonator. A resonant frequency of the second parallel arm resonator is in a frequency range of not lower than a resonant frequency of the series arm resonator.
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公开(公告)号：US20200044681A1
公开(公告)日：2020-02-06
申请号：US16055649
申请日：2018-08-06
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Jin YOKOYAMA , Shiro Masumoto , Syunji Yoshimi
Abstract: A transmit-and-receive module includes a multiplexer, a power amplifier, and a low-noise amplifier. The multiplexer includes a transmit filter and a receive filter. The power amplifier and the low-noise amplifier are integrated with each other. In a Smith chart, impedance in a receive band of the receive filter seen from a receive terminal intersects a line connecting a center point of noise figure circles and a center point of gain circles. The center point of the noise figure circles represents the impedance at which the noise figure of the low-noise amplifier is minimized. The center point of the gain circles represents the impedance at which the gain of the low-noise amplifier is maximized.
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