Murata Manufacturing Co., Ltd.

Ishida Co. Limited

Murata Manufacturingco., Ltd.

Hirotsugu Mori

Kengo Onaka

Kaoru Sudo

Hidenori Obiya

Yoshiki Yamada

Shinya Hitomi

Satoshi Tanaka

Atsushi Ono

Keisei Takayama

Motoharu Hiroshima

Yoshio Iwasaki

Tadashi Sugahara

Hideki Tsukamoto

Takaki Murata

Tomohiro Sano

Yuichi Tannan

Koji Nosaka

Yukio Kobayashi

Atsushi Horita

Ryo Komura

Keiichi Hirose

Taizo Hisano

Akira Morita

Yoshiaki Hasegawa

Kuniaki Yosui

Hideyuki Kato

Shigeru Tago

Morio Takeuchi

Syunsuke Kido

Masakazu Tani

Hideki Ueda

Reiji Nakajima

Soichi Nakamura

Hisao Hayafuji

Kazushige Sato

Yasunori Takei

Kota Arai

Hiroshi Izumitani

Junichi Yoshioka

Hiroshi Kojima

Satoshi Uozumi

Yusuke Kusumoto

An acoustic wave filter includes a first ladder circuit including a first series arm resonator and a first parallel arm resonator, a second ladder circuit including a second series arm resonator and a second parallel arm resonator, and a third ladder circuit including a third series arm resonator and a third parallel arm resonator. The first, second and third ladder circuits are cascade-connected in order. A condition of fas1>fas2>fas3>frp1>frp2>frp3 is satisfied, where fas1 represents an anti-resonant frequency of the first series arm resonator, fas2 represents an anti-resonant frequency of the second series arm resonator, fas3 represents an anti-resonant frequency of the third series arm resonator, frp1 represents a resonant frequency of the first parallel arm resonator, frp2 represents a resonant frequency of the second parallel arm resonator, and frp3 represents a resonant frequency of the third parallel arm resonator.

Acoustic wave filter

A radio frequency circuit includes a first radio frequency circuit, a second radio frequency circuit, and a first switch circuit. The first switch circuit includes a first terminal connected to an antenna connection terminal, a second terminal connected to the first radio frequency circuit, and a third terminal connected to the second radio frequency circuit. The first radio frequency circuit includes a first power amplifier circuit supporting a first power class, and a first filter circuit connected to the first power amplifier circuit and having a passband that includes a first band. The second radio frequency circuit includes a second power amplifier circuit supporting a second power class having a maximum output power greater than a maximum output power of the first power class. The second radio frequency circuit includes a second filter circuit connected to the second power amplifier circuit and having a passband that includes the first band.

Radio frequency circuit and radio frequency module

A frequency division duplex (FDD) first band includes a first downlink operating band and a first uplink operating band. An FDD second band includes a second downlink operating band and a second uplink operating band. In the FDD first band and the FDD second band, (1) the first downlink operating band, second downlink operating band, first uplink operating band, and second uplink operating band are positioned in order from lowest to highest frequency. The frequency range of the first uplink operating band and that of the second uplink operating band do not overlap each other. A filter is formed in or on a first substrate having piezoelectric properties and has a pass band including the first and second uplink operating bands.

Acoustic wave filter circuit, multiplexer, front-end circuit, and communication apparatus

A radio frequency circuit includes a power amplifier configured to selectively amplify one of a first radio frequency signal and a second radio frequency signal that have different bandwidths, and when the first radio frequency signal is input to the power amplifier, a first bias signal is applied to the power amplifier, and when the second radio frequency signal is input to the power amplifier, a second bias signal different from the first bias signal is applied to the power amplifier.

Radio frequency circuit, communication device, and antenna module

An antenna module including a dielectric substrate having a long side and a short side, a ground electrode, a radiating element, a peripheral electrode, and a parasitic element. The radiating element is disposed to face the ground electrode. The peripheral electrode is disposed along the long side of the dielectric substrate and is electrically connected to the ground electrode. The parasitic element is disposed along the short side of the dielectric substrate and is disposed away from the radiating element. The radiating element is configured to emit radio waves in two polarization directions along the long side and the short side of the dielectric substrate. The shortest distance between the radiating element and the parasitic element is greater than the shortest distance between the radiating element and the peripheral electrode.

Antenna module and communication device including the same

A radio-frequency circuit is used in simultaneous transfer of a radio-frequency signal of 4G and a radio-frequency signal of 5G, and includes a first transfer circuit that selectively receives the 4G radio-frequency signal or the 5G radio-frequency signal, and transfers a radio-frequency signal of a first communication band including a first transmission band and a first reception band and a radio-frequency signal of a second communication band including a second transmission band and a second reception band. The first and second transmission bands at least partially overlap. The first transfer circuit includes a first power amplifier that amplifies transmission signals of the first and second communication bands, and a first transmission filter that has a first passband including the first and second transmission bands, and passes the transmission signals of the first and second communication bands output from the first power amplifier.

Radio-frequency circuit and communication device

A common line is connected between a common terminal and a common connection node. A first filter has a first pass band. A second filter has a second pass band. At least one of a first condition and a second condition is satisfied. The first condition is that in the first pass band any one of a first impedance of the common line alone viewed from the common terminal (P) and a second impedance of the first filter viewed from the common connection node includes an inductive property and the other includes a capacitive property. The second condition is that in the second pass band one of the first impedance and a third impedance of the second filter viewed from the common connection node includes an inductive property and the other includes a capacitive property.

Multiplexer and antenna module

A communication device includes a dielectric substrate, a radiating element that has a flat shape and that is formed on the dielectric substrate, a housing that covers the dielectric substrate, and a rib. The rib is disposed in contact with the housing and the dielectric substrate. Feed points to which a radio frequency signal from an RFIC is supplied are formed in the radiating element. The rib and the dielectric substrate are in contact with each other in a center side region of the radiating element relative to the feed points, in a plan view from a normal direction of the dielectric substrate.

Communication device including a pressing member in contact with a cover member and a dielectric substrate

An antenna module includes a dielectric substrate, in or on which a feed element is formed, a dielectric substrate, in which a ground electrode (GND) is formed, and conductive members. The dielectric substrate is disposed opposite the dielectric substrate. When viewed in plan in the direction normal to the feed element, the conductive members are disposed around the feed element. An air layer is formed between the dielectric substrate and the dielectric substrate. The conductive members are formed in the air layer.

An antenna module includes feeding elements arranged adjacent to each other and filters connected to the respective feeding elements. Each of the filters includes a plurality of resonant lines that is not connected to each other. The filters are arranged between the feeding elements so as to cross a virtual line equidistant from the feeding elements when the antenna module is viewed in plan from the normal direction.

Antenna module, communication apparatus including the same, and circuit substrate

A radio-frequency circuit includes a switch and three filters. The switch is connected to an antenna connecting terminal. One filter has a pass band corresponding to a first sub-band and is configured to connect to the antenna connecting terminal via the switch. The first sub-band is included in a first band used for TDD communication. Another filter has a pass band corresponding to a second sub-band included in the first band and is configured to connect to the antenna connecting terminal via the switch. There is a gap between the first sub-band and the second sub-band. The remaining filter has a pass band corresponding to a third sub-band and is configured to connect to the antenna connecting terminal via the switch. The third sub-band includes the first sub-band, the second sub-band, and the gap.

Radio-frequency circuit

An antenna module includes a dielectric substrate having a multilayer structure, a power supply element and a ground electrode (GND) disposed in or on the dielectric substrate, a parasitic element, a power supply wiring line, and first and second stubs to be connected to the power supply wiring line. The parasitic element is disposed in a layer between the power supply element and the ground electrode (GND). The power supply wiring line passes through the parasitic element and supplies radio frequency power to the power supply element. The first stub is connected to a position different from a connection position of the second stub in the power supply wiring line.

Antenna module and communication apparatus equipped with the same

A radio frequency module includes: a first terminal to which a signal of a first frequency band is inputted, the first frequency band being at least a portion of an unlicensed band higher than or equal to 5 GHz; a second terminal to which a signal of a second frequency band is inputted, the second frequency band being at least a portion of a licensed band lower than 5 GHz; a first amplifier configured to amplify a signal of the first frequency band inputted to the first terminal; and a second amplifier configured to amplify a signal of the second frequency band inputted to the second terminal. In the radio frequency module, the first amplifier and the second amplifier are disposed in one package.

Radio frequency module and communication device

An antenna module includes radiating elements that radiate radio waves in a first polarization direction, and a feed conductor that supplies a common radio-frequency signal to the radiating elements. A first radiating element and a second radiating element are disposed adjacent to each other. The feed conductor includes a common conductor, and conductors branching off from the common conductor. The conductors are respectively coupled to the radiating elements. Frequency characteristics of an impedance of the radiating element are different from frequency characteristics of an impedance of the radiating element. Under another condition of a frequency band in which a return loss is less than or equal to a predetermined value is defined as an operable band width in each of the radiating elements, the operable band width of the radiating element partially overlaps the operable band width of the radiating element.

Antenna module and communication device equipped with the same

An antenna module includes a radiation element having feeding points, feeding wiring lines, and directional couplers. The feeding wiring line transmits a radio frequency signal from the RFIC to the feeding point. The feeding wiring line transmits a radio frequency signal from the RFIC to the feeding point. The directional coupler detects a radio frequency signal to be supplied to the radiation element through the feeding wiring line. The directional coupler detects a radio frequency signal to be supplied to the radiation element through the feeding wiring line. A polarization direction of a radio wave to be radiated with the radio frequency signal supplied to the feeding point is different from a polarization direction of a radio wave to be radiated with the radio frequency signal supplied to the feeding point.

Growing community of inventors

Kyoto, Japan

Hirotsugu Mori