Abstract: A radio frequency module includes a radio frequency filter (10), and the radio frequency filter (10) includes a terminal (11), a terminal (12), an impedance element (Z) disposed in series on a path (13) connecting the terminal (11) and the terminal (12), and a parallel arm resonator (P) connected between a node (N) on the path (13) and a ground. The impedance element (Z) is a capacitor or an inductor, and a wiring length A1 between the node (N) and the parallel arm resonator (P) is shorter than a wiring length B1 between the impedance element (Z) and a terminal (terminal (11), for example) out of the terminal (11) and the terminal (12) having a shorter wiring length to the impedance element (Z).

Abstract: 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.

Abstract: A radio frequency module includes: a first filter circuit disposed on a first path that connects an antenna terminal and a first input/output terminal, and having a passband that is a first frequency band; a second filter circuit disposed on a second path that connects the antenna terminal and a second input/output terminal, and having a passband that is a second frequency band higher than the first frequency band; and a band-elimination filter circuit disposed on the second path and having an attenuation band that is a partial band of a third frequency band that belongs to an unlicensed band ranging from 5 GHz or higher, and is higher than the second frequency band. The second filter circuit is an LC filter circuit that includes an inductor and a capacitor.

Abstract: A plurality of multi-band antenna elements operable at a plurality of frequencies constitutes an array antenna. An antenna drive unit selects at least some of the multi-band antenna elements from the plurality of multi-band antenna elements in accordance with one operation frequency selected from the plurality of operation frequencies, and causes the selected multi-band antenna elements to operate.

Abstract: 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.

Abstract: A multiplexer includes first and second filters connected to an antenna connecting terminal. The first filter includes a first series arm resonator and a first parallel arm resonator. Each of the first series arm resonator and the first parallel arm resonator includes a bottom electrode, a top electrode, and a piezoelectric layer. At least one of resonators forming the first series arm resonator and the first parallel arm resonator is constituted by plural series-divided resonators. The second filter includes plural second series arm resonators and a second parallel arm resonator. Each of the plural second series arm resonators and the second parallel arm resonator includes a bottom electrode, a top electrode, and a piezoelectric layer. Among the plural second series arm resonators, the top electrodes or the bottom electrodes of two adjacent second series arm resonators are formed by one electrode.

Abstract: An RF module includes first and second filters having pass bands corresponding to a TDD band. One low-noise amplifier's input is connected to the first filter and output is connected to a first RF output to provide a TDD band downlink signal. Another low-noise amplifier's input is connected to the second filter and output is connected to a second RF output to provide a TDD band downlink signal. A first switch includes terminals respectively connected to a first antenna connection, the first filter, and an RF input to receive a TDD band uplink signal. A second switch includes terminals respectively connected to a second antenna connection terminal, the second filter, and the RF input. The switches are formed on different dies. The second switch is also connected to the first switch via wiring outside the dies, and the first switch is connected to the RF input via the second switch.

Abstract: A multiplexer includes first, second, and third filters. The first filter has a first pass band including a first band to send a signal. The second filter has a second pass band including a second band to send a signal. The third filter has a third pass band including a third band. An unwanted frequency of a second-order or fourth-order distortion mode, generated when a first transmitted signal of the first band and a second transmitted signal of the second band are simultaneously transmitted, is included in at least one of the first, second, and third pass bands. An unwanted frequency of a third-order distortion mode, generated when the first transmitted signal and the second transmitted signal are simultaneously transmitted, is included in at least one of the first, second, and third pass bands. The first filter is a BAW filter. The second filter is a SAW filter.

Abstract: A radio frequency module includes: a first antenna connection terminal; a second antenna connection terminal different from the first antenna connection terminal; a first filter having a passband of a first frequency range including a first communication band allocated as a TDD communication band; a second filter having a passband of a second frequency range including a second communication band allocated as a TDD communication band; a third filter having a passband of a third frequency range including a third communication band allocated as a TDD communication band; and a fourth filter having a passband of a fourth frequency range including a fourth communication band allocated as a TDD communication band.

Abstract: An antenna module includes a multilayer substrate having a first main surface and a second main surface opposing to each other, a patch antenna formed on a side of the first main surface of the multilayer substrate and configured with a radiation electrode and a ground electrode, an RFIC formed on a side of the second main surface of the multilayer substrate, a first filter, and a second filter different from the first filter, wherein the patch antenna has a first feed point and a second feed point provided at different positions in the radiation electrode, the first feed point is electrically connected to the RFIC via the first filter, the second feed point is electrically connected to the RFIC via the second filter, and the first filter and the second filter are formed in the multilayer substrate.

Abstract: A radio frequency module includes: a first filter circuit disposed on a first path that connects an antenna terminal and a first input/output terminal, and having a passband that is a first frequency band; a second filter circuit disposed on a second path that connects the antenna terminal and a second input/output terminal, and having a passband that is a second frequency band higher than the first frequency band; and a band-elimination filter circuit disposed on the second path and having an attenuation band that is a partial band of a third frequency band that belongs to an unlicensed band ranging from 5 GHz or higher, and is higher than the second frequency band. The second filter circuit is an LC filter circuit that includes an inductor and a capacitor.

Abstract: 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.

Abstract: A radio-frequency circuit includes a first filter having a first passband including a first band; a second filter having a second passband including the first band; a power amplifier that amplifies a radio-frequency signal in the first band; and a switch that switches between connection between the first filter and the power amplifier and a connection between the second filter and the power amplifier. Under a condition that a transmission of the radio-frequency signal in the first band is not V2X communication, the first filter is connected to the power amplifier via the switch. Under a condition that the transmission of the radio-frequency signal in the first band is the V2X communication, the second filter is connected to the power amplifier via the switch.

Abstract: A radio-frequency circuit includes a filter circuit and a power amplifier circuit. The filter circuit includes a first pass band corresponding to a band of a cellular communication system and a second pass band corresponding to a band of a satellite communication system. The power amplifier is connected to the filter circuit. The second pass band is positioned between the first pass band and a third pass band corresponding to a band of a satellite navigation system, or the second pass band at least partially matches the first pass band.

Abstract: 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.

Abstract: 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.

Abstract: A multilayer substrate in which dielectric layers are laminated, the multilayer substrate including: a first electrode formed on the dielectric layers; and a first ground electrode disposed so as to be opposite to the first electrode in a multilayer direction. In the multilayer substrate, a plurality of dielectric layers include a first layer and a second layer that are disposed between a layer in which the first electrode is formed and a layer in which the first ground electrode is formed. In the first layer, a filler having permittivity lower than permittivity of a base material forming the dielectric layer is not disposed. In the second layer, the filler is disposed in at least a part of a region where the first electrode and the first ground electrode overlap each other in planar view of the multilayer substrate from the multilayer direction.

Abstract: A radio-frequency module is provided that includes a structure, a filtering element disposed on the structure, a switching element embedded in the structure, and an impedance element connected to the switching element and the filtering element. In a plan view of the structure, the switching element and the filtering element overlap each other in at least part thereof. The structure has a plurality of vias including a via , a via and a via. The via connects the input-output terminal and the filtering element. The via connects the ground terminal and an impedance adjustment circuit including the switching element and the impedance element. In a plan view, the via is located in a smallest rectangular region encompassing the vias.

Abstract: A radio frequency module includes: a first antenna connection terminal; a second antenna connection terminal different from the first antenna connection terminal; a first filter having a passband of a first frequency range including a first communication band allocated as a TDD communication band; a second filter having a passband of a second frequency range including a second communication band allocated as a TDD communication band; and a third filter having a passband of a third frequency range including a third communication band allocated as a TDD communication band. The third frequency range is located between the first frequency range and the second frequency range. The first and second filters are both connected to one of the first antenna connection terminal and the second antenna connection terminal. The third filter is connected to the other of the first antenna connection terminal and the second antenna connection terminal.

Abstract: 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.