A directional coupler includes a main line, a first sub-line, a second sub-line, a termination circuit, a selector switch, and a short-circuiting switch. The termination circuit terminates at least one of the first sub-line and the second sub-line. The selector switch connects the first sub-line and the termination circuit in a first mode and connects the second sub-line and the termination circuit in a second mode. The short-circuiting switch short-circuits both ends (a first end and a second end) of the second sub-line in the first mode.

Disclosed in an electronic device, which includes a housing that includes a first plate and a second plate facing a direction opposite the first plate, a conductive plate that is disposed in a first plane between the first plate and the second plate, and is parallel to the second plate, a wireless communication circuit that is disposed within the housing and is configured to transmit and/or receive a signal having a frequency ranging from 20 GHz to 100 GHz, a first electrical path having a first end electrically connected with the wireless communication circuit and a second end floated, the first electrical path including a first portion between the first end and the second end, a second electrical path having a third end electrically connected with the conductive plate and a fourth end floated, the second electrical path including a second portion between the third end and the fourth end.

An electromagnetic resonant coupler includes an input line to which a transmission signal is input; a first resonance line connected to the input line; a second resonance line opposing the first resonance line, the second resonance line undergoing resonant coupling with the first resonance line to thus wirelessly transmit the transmission signal between the first resonance line and the second resonance line; an output line connected to the second resonance line, the transmission signal being output through the output line; a coupling line that electromagnetically couples with at least one selected from the group consisting of the first resonance line and the second resonance line; and a terminator connected to one end of the coupling line.

The disclosure relates to a hybrid orthogonal signal generator, a coil transmission front-end device, an RF coil system, and an MRI system. The hybrid orthogonal signal generator has an input end for receiving an RF signal, generates a hybrid orthogonal excitation signal on the basis of the RF signal, and provides the hybrid orthogonal excitation signal by means of an output end of the hybrid orthogonal signal generator, and comprises: a first conductor, arranged in a plane and being arc-shaped; and a second conductor having mutual inductance with the first conductor, the second conductor being connected between the input end and output end, wherein the first conductor and second conductor are parallel and arranged as mirror images of each other. The hybrid orthogonal signal generator has a compact size and is suitable for providing hybrid orthogonal excitation signals for an MRI system with a low field strength.

An antenna arrangement includes an antenna element and a corresponding feeder line configured to feed a signal to and from the antenna element, and includes a portion of a couplerline spaced apart from but proximate to the antenna element, the feeder line, and a selectivity element. The portion of the couplerline is configured to receive via inductive coupling the signal from one or both of the feeder line and the antenna element, and to transmit a signal via inductive coupling to the feeder line and/or the antenna element. The antenna arrangement includes the selectivity element, which is spaced apart from but proximate to the antenna element, the feeder line, and the portion of the couplerline, and which is configured to select or not select the antenna element for coupling to the portion of the couplerline. An apparatus may include multiple antenna arrangements (with subgroups) and be configured for AAS calibration.

An electromagnetic coupler includes a first transmission line connecting an input port to an output port. A second transmission line adjacent the first transmission line connects a coupled port and an isolation port. The electromagnetic coupler provides a coupled signal at the coupled port, which is representative of an input signal at the input port. The amplitude of the coupled signal is related to the amplitude of the input signal by a coupling factor. A tuning element is provided adjacent to the first or second transmission line and is coupled to an impedance. Varying impedance values cause an adjustment to the coupling factor and reactive impedance values provide frequency filtering effects.

A coupler is presented that has high-directivity and low coupling coefficient variation. The coupler includes a first trace with a first edge substantially parallel to a second edge and substantially equal in length to the second edge. The first trace includes a third edge substantially parallel to a fourth edge. The fourth edge is divided into three segments. The outer segments are a first distance from the third edge. The middle segment is a second distance from the third edge. Further, the coupler includes a second trace, which includes a first edge substantially parallel to a second edge and substantially equal in length to the second edge. The second trace includes a third edge substantially parallel to a fourth edge. The fourth edge is divided into three segments. The outer segments are a first distance from the third edge. The middle segment is a second distance from the third edge.

An electrical component, such as an RF device or thermal bridge, for use with a printed circuit board. The component has a first dielectric layer having a top and a bottom, a first conductive trace positioned on the bottom of the dielectric layer, and a first ground layer positioned on the bottom of the dielectric layer and spaced apart from the first conductive trace. For RF applications, a second conductive trace is positioned on top of first dielectric, a second dielectric is positioned on top of the second conductive trace, and a second ground plane is positioned on top of the second dielectric. A printed circuit board having a third conductive trace may then be coupled to the first conductive trace by a first solder layer.

A marchand balun with a reduced plane size is disclosed. The marchand balun provides two coupling units each having two transmission lines coupled to each other and having a length of λ/8, where λ is a characteristic wavelength of a signal subject to the marchand balun. The marchand balun further provides an additional unit, where two coupling unit and the additional unit are connected in series to each other. The additional unit is one of a transmission line with a length of λ/16 with one open end and a capacitor with one grounded end.

Devices and methods related to directional couplers. In some implementations, a coupler can include a driver arm and a coupler arm implemented relative to the driver arm to detect power of an RF signal. Portions of the driver and coupler arms can form an overlapping region, with at least one of the driver and coupler arms having a non-straight arm shape. The overlapping region can include a non-zero lateral offset between the driver and coupler arms. In some implementations, a coupler can include a driver arm having input and output sides, and a coupler arm having input and output sides and implemented relative to the driver arm to detect power of an RF signal. The coupler can further include a phase-shifting feature implemented with respect to at least one of the driver and coupler arms to reduce phase difference of power ripples associated with the coupler.