A semiconductor chip includes a first wireless communication circuit, a local oscillator (LO) buffer, and an auxiliary path. The first wireless communication circuit has a signal path, wherein the signal path has a mixer input port and a signal node distinct from the mixer input port. The auxiliary path is used to electrically connect the LO buffer to the signal node of the signal path. The LO buffer is reused for a loop-back test function through the auxiliary path.

A feeding device is disclosed. The feeding device includes a body and at least one first port, the body includes at least one first contour port, and each of the at least one first contour port corresponds to one of the at least one first port; and the first contour port includes at least two sub-ports, and the at least two sub-ports of the first contour port are connected, by using at least one power splitter, to the first port corresponding to the first contour port. In the foregoing implementation solution, the first contour port is divided into several sub-ports, and the first port and the several sub-ports are connected by using the at least one power splitter.

A balun is disclosed and includes a dielectric substrate defining a first surface and a second surface. The balun includes a first output port including a first output ground portion and first output power portion; a second output port including a second output ground portion and a second output power portion; and an input port including an input ground portion and input power portion. The first output ground portion, the second output ground portion, and the input ground portion are coupled at a ground junction portion. The first output power portion, the second output power portion, and the input power portion are coupled at a power junction portion. The first output power portion, the second output power portion, and the input power portion are positioned on the first surface. The first output ground portion, the second output ground portion, and the input ground portion are positioned on the second surface.

An illustrative example transmission device, which is useful for an automated vehicle, includes a substrate having a metal layer near one surface of the substrate and a waveguide area. The metal layer includes a slot that at least partially overlaps the waveguide area. A source of radiation includes a first radiation output situated on a first side of the slot and a second radiation output situated on a second, opposite side of the slot.

The present invention provides a circularly polarised, CP, antenna device for multiband GNSS. It comprises a spiral antenna and a high impedance surface, HIS, comprising a conductive layer comprising a first region and a separate second region, and a ground plane. The first region of the conductive layer is provided with at least one resonant element of a first resonant frequency and the second region of the conductive layer is provided with at least one resonant element of a second resonant frequency.

The present invention provides a circularly polarised, CP, antenna device for multiband GNSS. It comprises a spiral antenna and a high impedance surface, HIS, comprising a conductive layer comprising a first region and a separate second region, and a ground plane. The first region of the conductive layer is provided with at least one resonant element of a first resonant frequency and the second region of the conductive layer is provided with at least one resonant element of a second resonant frequency.

A balun includes a substrate, a balanced port, and an unbalanced port. The balanced port disposed on a first configuration surface of the substrate includes a first metal configuration section, a second metal configuration section, and two balanced terminals respectively disposed at one end of the first metal configuration section and one end of the second metal configuration section. The unbalanced port is disposed on a second configuration surface of the substrate corresponding to an arrangement of the balanced port to form an overlapping coupling with the balanced port. The unbalanced port includes a third metal configuration section and an unbalanced terminal disposed at one end of the third metal configuration section. A first orthographic projection on the substrate formed by the first metal configuration section and the second metal configuration section jointly is overlapped with a second orthographic projection on the substrate formed by the third metal configuration section.

A balun includes a substrate, a balanced port, and an unbalanced port. The balanced port disposed on a first configuration surface of the substrate includes a first metal configuration section, a second metal configuration section, and two balanced terminals respectively disposed at one end of the first metal configuration section and one end of the second metal configuration section. The unbalanced port is disposed on a second configuration surface of the substrate corresponding to an arrangement of the balanced port to form an overlapping coupling with the balanced port. The unbalanced port includes a third metal configuration section and an unbalanced terminal disposed at one end of the third metal configuration section. A first orthographic projection on the substrate formed by the first metal configuration section and the second metal configuration section jointly is overlapped with a second orthographic projection on the substrate formed by the third metal configuration section.

A microwave system has a solid-state generator which generates microwave energy and includes at least one control input for receiving a control signal to vary electrically a parameter of the microwave energy. A microwave load receives the microwave energy and produces an effect in response to the microwave energy. A microwave conducting element couples the microwave energy to the microwave load. An impedance match adjusting device is coupled to the microwave conducting element to vary at least one of the parameters of the microwave energy. The effect produced in response to the microwave energy is altered by both electrical variation of the parameter of the microwave energy via the control signal and adjustment of the impedance match adjusting device to vary the parameter of the microwave energy.

A feeding structure, a microwave radio frequency device and an antenna are provided. The feeding structure includes a first substrate and a second substrate opposite to each other, a reference electrode, and a dielectric layer between the first substrate and the second substrate. The first substrate includes a first base plate, and a coupling branch and a delay branch on a side of the first base plate proximal to the dielectric layer, the coupling branch and the delay branch are configured to be connected to two output terminals of a power divider, respectively, and both form a current loop with the reference electrode. The second substrate includes a second base plate and a receiving electrode on a side of the second base plate proximal to the dielectric layer, the receiving electrode and the coupling branch form a coupling structure, and orthographic projections of the receiving electrode and the coupling branch on the first base plate at least partially overlap each other. A length of an orthographic projection of both the coupling branch and the receiving electrode on the first base plate is different from a length of the delay branch, such that a phase of a microwave signal transmitted on the coupling structure is different from a phase of a microwave signal transmitted on the delay branch.