Aspects of this disclosure relate to a filter for a carrier aggregation system. The filter is configured to pass a first band of a carrier aggregation signal. The filter includes a surface acoustic wave device that includes a quartz substrate, an interdigital transducer electrode, and a lithium-based piezoelectric layer positioned between the quartz substrate and the interdigital transducer electrode. The surface acoustic wave device is configured to suppress a higher order spurious mode corresponding to a second band of the carrier aggregation signal.

A magnetic resonance imaging apparatus is provided. The apparatus includes a plurality of receiving antennas for receiving a plurality of reception signals. The apparatus also includes at least one first superposition device having at least one first and one second output, which in each case serve for providing a mode formed by superposition of at least two of the reception signals. The apparatus also includes at least one first frequency division multiplex device for transmitting input signal present at a first and a second input of the frequency division multiplex device via a first transmission link on different frequency bands to a receiving unit, wherein the first output of the first superposition device is connected to the first input of the first frequency division multiplex device and the second output of the first superposition device is connected directly or indirectly to a second transmission link.

An electronic component includes: a first substrate having a first surface; a second substrate having a second surface facing the first surface across an air gap; a first coil pattern that is located on the first surface so as to face the second surface across the air gap; a second coil pattern that is located in a second region on the second surface and faces the first surface across the air gap, at least a part of the second region overlapping with a first region in plan view, the first region being formed of a region in which the first coil pattern is located and a region surrounded by the first coil pattern; and a connection terminal connecting the first coil pattern and the second coil pattern.

Front-end architecture having quadplexer for carrier aggregation and MIMO support. In some embodiments, a front-end architecture can include a quadplexer configured to support uplink carrier aggregation with a first antenna. The quadplexer can include a low-band filter, a mid-band filter, a first high-band filter, and a second high-band filter, with each filter having a respective input node, and the quadplexer including a common output node associated with the first antenna. The front-end architecture can further include a triplexer configured to support uplink carrier aggregation with a second antenna. The triplexer can include a mid-band filter, a first high-band filter, and a second high-band filter, with each filter having a respective input node, and the triplexer including a common output node associated with the second antenna.

A method and system for phase correction in a receiver receives a plurality of samples and filters the samples using a polyphase FIR filter. The samples are simultaneously shifted, centered and channelized using a MUX/negate process and a fast Fourier transform (FFT).

An acoustic wave resonator includes: a piezoelectric substrate; and an interdigital transducer (IDT) located on the piezoelectric substrate, the IDT including a pair of comb-shaped electrodes having a plurality of electrode fingers and a bus bar to which the plurality of electrode fingers are coupled, the IDT having: a first region in which a pitch of electrode fingers is substantially constant; a second region in which a pitch of electrode fingers decreases at closer distances to an outer side; and a third region in which a pitch of electrode fingers increases at closer distances to an outer side, the second region being located outside the first region in an arrangement direction of the plurality of electrode fingers, and the third region being located outside the second region in the arrangement direction.

A transmitting and receiving circuit that transmits and receives signals using coaxial cables includes an input/output terminal that delivers and receives signals, a first port, a second port, a switch, and a ceramic-based electro-static discharge protector. The first port transfers a transmitted signal in a first transmission frequency band width and a received signal in a first reception frequency band width. The second port transfers a transmitted signal in a second transmission frequency band width and a received signal in a second reception frequency band width. The switch connects a common port to one of the first port and the second port. The common port is connected to the input/output terminal on one end of the common port and to the switch on the other end. The electro-static discharge protector is connected between the common port and the ground potential.

A method and apparatus provide a physical uplink channel in resource blocks. Scheduling information can be received. The scheduling information can be to transmit a first physical uplink channel within a slot. The slot can include a plurality of symbols. The slot can include the first physical uplink channel and a second physical uplink channel. The first physical uplink channel can be shorter in duration than the second physical uplink channel. One or more allocated resource blocks for the first physical uplink channel can be determined based on a sub-band group and one or more resource block groups within the sub-band group. The sub-band group can include one or more sub-bands. Each sub-band can include one or more resource block groups. Each resource block group can include one or more resource blocks. A resource block can include one or more contiguous resource elements in the frequency domain. The first physical uplink channel can be transmitted in the determined one or more allocated resource blocks in the slot.

A method and apparatus provide a physical uplink channel in resource blocks. Scheduling information can be received. The scheduling information can be to transmit a first physical uplink channel within a slot. The slot can include a plurality of symbols. The slot can include the first physical uplink channel and a second physical uplink channel. The first physical uplink channel can be shorter in duration than the second physical uplink channel. One or more allocated resource blocks for the first physical uplink channel can be determined based on a sub-band group and one or more resource block groups within the sub-band group. The sub-band group can include one or more sub-bands. Each sub-band can include one or more resource block groups. Each resource block group can include one or more resource blocks. A resource block can include one or more contiguous resource elements in the frequency domain. The first physical uplink channel can be transmitted in the determined one or more allocated resource blocks in the slot.

A method and apparatus provide for scheduling information for a downlink data channel. Scheduling information can be transmitted to a user equipment regarding a downlink data channel in a slot. The scheduling information can include information regarding at least a set of allocated subcarriers. The downlink data channel can require the user equipment to send an immediate hybrid automatic repeat request acknowledgement feedback within the slot. Downlink data can be transmitted using every x-th subcarrier among the allocated subcarriers in the last symbol of the downlink data channel.