First ends of a plurality of sub-networks of an exemplary transmission-line network are connected together electrically in series. First ends of a plurality of transmission lines of one subnetwork are connected together in parallel and second ends are connected together in series. The one sub-network has a first-end impedance value that is different than a second-end impedance value. The second-end impedance value of the one sub-network is different than a second-end impedance value of another sub-network. A respective transmission line connects each sub-network to a common circuit node and a respective resistor interconnects each adjacent pair of the second ends of the sub-networks.

A multicomponent network may be added to a transmission line in a high-frequency circuit to transform a first impedance of a downstream circuit element to second impedance that better matches the impedance of an upstream circuit element. The multicomponent network may be added at a distance more than one-quarter wavelength from the downstream circuit element, and can tighten a frequency response of the impedance-transforming circuit to maintain low Q values and low VSWR values over a broad range of frequencies.

The present disclosure provides a microwave transmission apparatus. The microwave transmission apparatus includes a waveguide, configured to transmit microwaves emitted from a microwave source to a load; and an impedance matching structure, disposed in the waveguide the waveguide. The waveguide includes a microstrip interdigital capacitor. The impedance before the input end of the impedance matching structure is matched with the impedance after the input end of the impedance matching structure by adjusting an equivalent capacitance formed by the microstrip interdigital capacitor and/or a position of the microstrip interdigital capacitor along the extending direction of the waveguide.

A capless impedance tuner can include first node and second nodes, a first series path, a second series path, and an inductance path, each between the first node and the second node and including a switch to allow the path to couple or uncouple the first and second nodes. Each series path can be configured to allow a substantially continuous flow of a direct current between the first node and the second node when coupled. The tuner can further include a shunt path with a switch to allow coupling or uncoupling of the second node and ground. The tuner can further include a switchable grounding path implemented along the inductance path and configured to allow the inductance path to function as a series inductance path between the first and second nodes, or as a shunt inductance path between the ground and a node along the inductance path.

Embodiments may relate to a radio frequency (RF) front-end module (FEM) with a first filter and a second filter. The RF FEM may include a termination inductor coupled to ground, and a switch that is to selectively couple the first filter and the second filter to the termination inductor. Other embodiments may be described or claimed.

Embodiments of this application disclose an optoelectronic component and a fabrication method thereof. The optoelectronic component includes a capacitor, an inductor, a carrier component, and an optoelectronic element, where the capacitor, the inductor, and the optoelectronic element are all disposed on the carrier component. The inductor and the capacitor are configured to form a resonant circuit, where a resonance frequency of the resonant circuit is correlated with a signal output frequency of the optoelectronic element. A first electrode of the optoelectronic element is connected to a first electrode of the carrier component through the inductor, and a second electrode of the optoelectronic element is connected to a second electrode of the carrier component. A first electrode of the capacitor is connected to the first electrode of the carrier component, and a second electrode of the capacitor is connected to the second electrode of the carrier component.

An integrated circuit for use in a differential network bus node comprising: a transceiver having a first transceiver input-output terminal and a second transceiver input-output terminal; a physical layer high terminal connected to the first transceiver input-output-terminal; a physical layer low terminal connected to the second transceiver input-output terminal; and a physical layer interface circuit comprising: a first low frequency RC matching circuit and a first high frequency RC matching circuit each connected between the first transceiver input-output-terminal and a first reference terminal; and a second low frequency RC matching circuit and a second high frequency RC matching circuit each connected between the second transceiver input-output terminal and a second reference terminal.

Disclosed is an impedance matcher for use in a communication system, operable to match a transmitter or receiver, respectively, to an associated antenna, comprising a stub matching circuit and a phase shifter, whereby, in use, energy flows from a source to the phase shifter, to the stub matching circuit and to a load.

A Doherty power amplifier circuit having a main power amplification device, an auxiliary power amplification device arranged in parallel with the main power amplification device, and a load modulation circuit comprising a harmonic injection circuit connected with respective outputs of the main power amplification device and the auxiliary power amplification device. The harmonic injection circuit is arranged to transfer harmonic components generated at the main power amplification device to the auxiliary power amplification device and harmonic components generated at the auxiliary power amplification device to the main power amplification device, when both o the main and auxiliary power amplification devices are operating, for modulating the respective outputs of the main power amplification device and the auxiliary power amplification device.

A superconducting circuit may include a transmission line having at least one transmission line inductance, a superconducting resonator, and a coupling capacitance that communicatively couples the superconducting resonator to the transmission line. The transmission line inductance may have a value selected to at least partially compensate for a variation in a characteristic impedance of the transmission line, the variation caused at least in part by the coupling capacitance. The coupling capacitance may be distributed along the length of the transmission line. A superconducting circuit may include a transmission line having at least one transmission line capacitance, a superconducting resonator, and a coupling inductance that communicatively couples the superconducting resonator to the transmission line. The transmission line capacitance may be selected to at least partially compensate for a variation in coupling strength between the superconducting resonator and the transmission line.