An elastic wave device includes an unbalanced first bandpass filter and a second bandpass filter. The first bandpass filter includes first and second longitudinally coupled resonator elastic wave filters that are connected in parallel between an output terminal and an antenna terminal, and first and second elastic wave resonators respectively connected between the first and second longitudinally coupled resonator elastic wave filters and the antenna terminal. The second bandpass filter is connected to the antenna terminal and has a passband different from a passband of the first bandpass filter. An elastic wave wavelength specified by an electrode finger pitch of an IDT electrode included in the first elastic wave resonator and an elastic wave wavelength specified by an electrode finger pitch of an IDT electrode included in the second elastic wave resonator are different from each other.

An integrated isolator circuit for isolating receiver and transmitter in a Time-Division Duplex transceiver is disclosed. The integrated isolator circuit comprises a first node, a second node and a third node. The integrated isolator circuit further comprises a fist capacitor connected in series with a first switch and connected between the first and second nodes. The integrated isolator circuit further comprises a first inductor connected between the first and second nodes and a second capacitor connected between the second node and the third node. The first switch has an on state and an off state, and the integrated isolator circuit is configured to have a different impedance at a certain operating frequency by controlling the state of the first switch.

A CATV & MoCA splitter has an input and at least one output that is CATV & MoCA and at least one output that is MoCA only. The splitter functions as a building block to provide a customizable installation that supplies the needed number of CATV & MoCA outputs and the needed number of MoCA only outputs. The splitter includes a housing with first, second and third coaxial ports attached to the housing. In one embodiment, the second coaxial port is connected to the first coaxial port via a power divider so that all frequencies presented to the first coaxial port can pass to the second coaxial port, and vice versa. A high pass filter, which passes only MoCA signals, connects the power divider and third coaxial port.

A diplexer circuit is provided. The diplexer circuit, which includes a pair of hybrid couplers and a filter circuit, can be configured to support dual-connect (DC) communications on a pair of signal bands separated by a narrower transition band (e.g., 200 MHz). In examples discussed herein, one of the signal bands is associated with a narrower fractional bandwidth (e.g., <13%) than the other signal band. In this regard, the filter circuit can be opportunistically configured to operate based on the narrower fractional bandwidth. By configuring the filter circuit to operate based on the narrower fractional bandwidth, it is possible to eliminate the need for supporting the wider fractional bandwidth in the diplexer circuit. As a result, it may be possible to implement the diplexer circuit using conventional filters to support DC communications on signal bands associated with a wider fractional bandwidth(s) and separated by a narrower transition band.

A multiplexer includes a first filter disposed on a first signal path, a second filter disposed on a second signal path different from the first signal path, the second filter having a passband different from that of the first filter, a common connection point at which the first signal path and the second signal path are connected to each other, and an inductor disposed in series on a path connecting the common connection point and the first filter, the path being a portion of the first signal path. On the first signal path, a distance connecting the common connection point and the inductor is shorter than a distance connecting the inductor and the first filter.

A first attenuation circuit is connected between a node and ground, and the node is located between a ladder resonance circuit and a transmitter-side terminal. A second attenuation circuit is connected between a first parallel arm resonator of the ladder resonance circuit and ground and is connected in series to the first parallel arm resonator. The first attenuation circuit includes a second parallel arm resonator and a first switch that switches between a first state in which the second parallel arm resonator is connected to the node and a second state in which the first switch is open. The second attenuation circuit includes a capacitor and a second switch that switches between a first state in which the capacitor is connected to the first parallel arm resonator and a second state in which the first parallel arm resonator is connected to ground.

Broadband power splitter. In some embodiments, a power splitter can include an input port, a first output port and a second output port. The power splitter can further include a first signal path implemented between the input port and the first output port, and a second signal path implemented between the input port and the second output port. Each of the first and second signal paths can include a variable capacitance configured to provide a plurality of capacitance values that result in different frequency responses of the respective signal path.

An elastic wave device includes an unbalanced first bandpass filter and a second bandpass filter. The first bandpass filter includes first and second longitudinally coupled resonator elastic wave filters that are connected in parallel between an output terminal and an antenna terminal, and first and second elastic wave resonators respectively connected between the first and second longitudinally coupled resonator elastic wave filters and the antenna terminal. The second bandpass filter is connected to the antenna terminal and has a passband different from a passband of the first bandpass filter. An elastic wave wavelength specified by an electrode finger pitch of an IDT electrode included in the first elastic wave resonator and an elastic wave wavelength specified by an electrode finger pitch of an IDT electrode included in the second elastic wave resonator are different from each other.

A filter device includes a filter (22A) connected to a common terminal (110) and having a first characteristic, a variable filter (22B) connected to the common terminal (110) and capable of changing a characteristic to one of a second characteristic and a third characteristic, and a switch (23). In the second characteristic, a second pass band including an overlapping band in which the second pass band and an attenuation band of the filter (22A) partially overlap in frequency is defined. Insertion loss within the overlapping band for the third characteristic is greater than insertion loss within the overlapping band for the second characteristic. When the filter (22A) is selected by the switch (23), the characteristic of the variable filter (22B) is set to the third characteristic.

A power combiner/splitter for multiple input multiple output (MIMO) applications and a method of making the same. A metallisation stack has a plurality of layers including patterned metal features forming first and second branched arrangements of the power combiner/splitter. Each branched arrangement includes a port located at one end of that branched arrangement, and a plurality of further ports. Each branched arrangement also includes a plurality of bifurcated branches extending between each end of that branched arrangement for dividing/combining a signal passing through that branched arrangement between the port and the plurality of further ports. The metallisation stack further includes a common ground plane that is shared by the first and second branched arrangements. At least some of the patterned metal features forming the first branched arrangement overlie at least some of the patterned metal features forming the second branched arrangement.