Radio-frequency splitter circuits, devices and methods. 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.

Tunable, broadband directional coupler circuits employing one or more additional, switchable coupling circuits for controlling frequency response, and related methods. In exemplary aspects, the directional coupler includes one or more additional coupling circuits that each include an additional coupling line located adjacent to the primary coupling line and that can be selectively activated to change a frequency response of the directional coupler. When an additional coupling circuit is activated, its additional coupling line has the effect of extending the length of the primary coupling line through mutual inductance, thus changing the coupling frequency response of the directional coupler. The additional coupling circuit includes one or more switch(es) to allow for the selective coupling of its additional coupling line to the coupling and/or isolation ports of the directional coupler to selectively change and control the frequency response of the primary coupling line.

Tunable, broadband directional coupler circuits employing one or more additional, switchable coupling circuits for controlling frequency response, and related methods. In exemplary aspects, the directional coupler includes one or more additional coupling circuits that each include an additional coupling line located adjacent to the primary coupling line and that can be selectively activated to change a frequency response of the directional coupler. When an additional coupling circuit is activated, its additional coupling line has the effect of extending the length of the primary coupling line through mutual inductance, thus changing the coupling frequency response of the directional coupler. The additional coupling circuit includes one or more switch(es) to allow for the selective coupling of its additional coupling line to the coupling and/or isolation ports of the directional coupler to selectively change and control the frequency response of the primary coupling line.

A power divider and an electronic device are provided. The power divider includes: a main port having an input characteristic admittance; a first output port having a first characteristic admittance; a second output port having a second characteristic admittance, where the second and the first characteristic admittances have a predetermined ratio relationship; a first adjustment branch coupled between the main port and the first output port; and a second adjustment branch coupled between the main port and the second output port. The input characteristic admittance is a sum of admittances presented by the first and second adjustment branches at the main port. The admittance presented by the first adjustment branch at the main port and the admittance presented by the second adjustment branch at the main port are adjustable and the input characteristic admittance is enabled to be equal to a sum of the first and the second characteristic admittances.

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.

A phase shifter circuit and a power divider are disclosed. The phase shifter circuit provides a (90/N)-degree phase shift for a signal with two or more frequencies, where N is an integer. The phase shifter circuit includes a first inductor, a first capacitor, a second inductor and a second capacitor. The first inductor is grounded, and is coupled to the first capacitor in series. The second inductor is grounded, and is coupled to the second capacitor in series. A first node between the first capacitor and the first inductor is coupled to a node between a second node between the second capacitor and the second inductor. The power divider includes plural circuit blocks cascaded in series. Each circuit block provides a (90/N)-degree phase shift for a signal with two or more operating frequencies.

A phase shifter circuit and a power divider are disclosed. The phase shifter circuit provides a (90/N)-degree phase shift for a signal with two or more frequencies, where N is an integer. The phase shifter circuit includes a first inductor, a first capacitor, a second inductor and a second capacitor. The first inductor is grounded, and is coupled to the first capacitor in series. The second inductor is grounded, and is coupled to the second capacitor in series. A first node between the first capacitor and the first inductor is coupled to a node between a second node between the second capacitor and the second inductor. The power divider includes plural circuit blocks cascaded in series. Each circuit block provides a (90/N)-degree phase shift for a signal with two or more operating frequencies.

The embodiments relate to a directional coupler including, in each case, one connection for a first, a second, a third, and a fourth port. The coupler includes a first coupling network for providing the connection for the first port and a second coupling network for providing the connection for the second port. The first and second coupling networks are both connected to the connections for the third and fourth ports, wherein the second coupling network has a first inductance connected between the third port and an electrical reference potential, a first capacitance connected between the fourth port and the electrical reference potential, a second capacitance connected between the third port and the second port, and a second inductance connected between the fourth port and the second port.

The embodiments relate to a directional coupler including, in each case, one connection for a first, a second, a third, and a fourth port. The coupler includes a first coupling network for providing the connection for the first port and a second coupling network for providing the connection for the second port. The first and second coupling networks are both connected to the connections for the third and fourth ports, wherein the second coupling network has a first inductance connected between the third port and an electrical reference potential, a first capacitance connected between the fourth port and the electrical reference potential, a second capacitance connected between the third port and the second port, and a second inductance connected between the fourth port and the second port.