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.

A power amplification circuit can include an input impedance matching circuit associated with one or more frequency bands of a plurality of frequency bands. The power amplification circuit can include a transistor with respective input coupled to an output of the input impedance matching circuit. The power amplification circuit can include a plurality of output impedance matching circuits. Each output impedance matching circuit can be associated with a respective frequency band of the plurality of frequency bands. The power amplification circuit can include a single pole multi-throw (SPMT) switch having an input terminal connected to an output of the transistor and a plurality of output terminals. Each output terminal of the SPMT switch can be connected to a corresponding output impedance matching circuit of the plurality of output impedance matching circuits.

A switchable reactance unit includes an RF terminal configured to connect to a transmission line for transmitting a signal at a frequency in a range of 1 - 200 MHz, and a switching arrangement comprising a plurality of switching elements used in parallel. Each switching element has a control terminal, and is connected to the RF terminal via at least one individual reactance assigned to the switching element and connected in series with the switching element. The switching elements are controllable or controlled via their control terminals in such a way that they switch simultaneously.

The present invention is directed to communication systems and electrical circuits. According to an embodiment, the present invention provides a termination circuit that includes an inductor network. The inductor network is coupled to a termination resistor and a capacitor network, which includes a first capacitor and a second capacitor. The termination resistor, the first capacitor, and the second capacitor are adjustable, and they affect attenuation of the termination circuit. There are other embodiments as well.

The disclosure provides a controller for a device having near field RF communications capabilities. The controller is configured to: tune the impedance of at least one component of an impedance matching circuit to vary an impedance transformation provided by the impedance matching circuit; determine at least one indication of power output from the circuit, each at least one indication corresponding to an impedance transformation; and identify one of a plurality of modes of the circuit as an operating mode, based on the at least one indication, wherein the impedance matching circuit provides a different impedance transformation in each mode.

A frequency equalizer is provided. The frequency equalizer includes a coupler including a main segment extending between a first port and a second port and a coupled segment disposed in a coupling relationship with the main segment and extending between a third port and a fourth port. The frequency equalizer further includes a first thermistor electrically coupled in series between the first port and an input line, a second thermistor electrically coupled in series between the second port and an output line, and a first shunt resistor coupled across the third port. The frequency equalizer simultaneously provides frequency equalization and temperature compensation for signals transmitted through the frequency equalizer.

A method of manufacturing an RF switch includes adding a first mutual inductance portion to a first self-inductance portion of a first transmission line; and adding a second mutual inductance portion to a second self-inductance portion of a second transmission line, wherein values of the first and second mutual inductance portions and values of the first and second self-inductance portions equalize an impedance difference between the first transmission line and the second transmission line.

This invention relates to an antenna system comprising two identical mutually radiation coupled antennas arranged symmetrically with respect to one another, said antennas having a respective antenna connection gate and a network, which is connected at the input side to the antenna connection gates and which is formed from dummy elements, and having a respective antenna path to a network connection gate, said antenna paths being identical to one another and being separately associated with an antenna.

Methods and apparatus for processing a substrate are provided herein. For example, a matching network for use with a plasma processing chamber comprises an input configured to connect to a power source, an output configured to connect to the plasma processing chamber, a V/I sensor connected between the input of the matching network and an output of the power source, a load capacitor connected in parallel with at least one capacitor connected in series with a load switch, a tuning capacitor connected in series with at least one capacitor connected in parallel with a tuning switch, and a multiple level pulsing phase/magnitude module connected to the V/I sensor and to a multiple level pulsing synchronization switch driver connected to each of the load switch and the tuning switch for activating at least one of the load switch and the tuning switch in response to a control signal, which is based on a V/I sensor measurement, received from the power source.

The present disclosure facilitates impedance matching between a power amplifier and filters. A radio-frequency circuit includes a power amplifier, a plurality of transmit filters, a switch, a plurality of first matching networks, and a second matching network. The switch switches the plurality of transmit filters to be coupled to the power amplifier. The plurality of first matching networks are coupled between the plurality of transmit filters and the switch. The second matching network is coupled between the power amplifier and the switch. The second matching network includes a transmission line transformer.