According to one embodiment, a coupler includes first to fourth capacitors, first and second inductors, and a first Josephson junction. The first capacitor includes a first capacitor end portion and a first capacitor other-end portion. The first inductor includes a first inductor end portion, and a first inductor other-end portion. The second inductor includes a second inductor end portion, and a second inductor other-end portion. The first Josephson junction includes a first Josephson junction end portion, and a first Josephson junction other-end portion. A space is surrounded with the first inductor, the second inductor, and the first Josephson junction. The third capacitor includes a third capacitor end portion, and a third capacitor other-end portion. The fourth capacitor includes a fourth capacitor end portion, and a fourth capacitor other-end portion.

According to one embodiment, a coupler includes first to fourth capacitors, first and second inductors, and a first Josephson junction. The first capacitor includes a first capacitor end portion and a first capacitor other-end portion. The first inductor includes a first inductor end portion, and a first inductor other-end portion. The second inductor includes a second inductor end portion, and a second inductor other-end portion. The first Josephson junction includes a first Josephson junction end portion, and a first Josephson junction other-end portion. A space is surrounded with the first inductor, the second inductor, and the first Josephson junction. The third capacitor includes a third capacitor end portion, and a third capacitor other-end portion. The fourth capacitor includes a fourth capacitor end portion, and a fourth capacitor other-end portion.

An electronic circuit configured to present a high-impedance load between a load point and a reference point includes a capacitive element (C) provided between a first node (Node A) and the reference point, a first element (D.sub.1) connected in parallel with the capacitive element (C), a first switching element (S.sub.1) provided in series between the first node (A) and a voltage source point, a second switching element (S.sub.2) provided between the first node (A) and a second node (Node B), a second element (D.sub.2) connected between the second switching element (S.sub.2), the load point, and the reference point, and timing control logic configured to implement three stages. In a charging stage, the first switching element (S.sub.1) is closed and the second switching element (S.sub.2) to charge a nodal voltage v.sub.D(t) at the first node (A). In discharge stage, the first switching element (S.sub.1) is open and the second switching element (S.sub.2) is open to enable discharging of the capacitive element (C) through the first element (D.sub.1). In a transfer stage, the second switching element (S.sub.2) is closed to connect the first node (A) and the second node (B), after which the second switching element (S.sub.2) is opened and the second element (D.sub.2) is biased to present the high-impedance load.

An electronic circuit configured to present a high-impedance load between a load point and a reference point includes a capacitive element (C) provided between a first node (Node A) and the reference point, a first element (D.sub.1) connected in parallel with the capacitive element (C), a first switching element (S.sub.1) provided in series between the first node (A) and a voltage source point, a second switching element (S.sub.2) provided between the first node (A) and a second node (Node B), a second element (D.sub.2) connected between the second switching element (S.sub.2), the load point, and the reference point, and timing control logic configured to implement three stages. In a charging stage, the first switching element (S.sub.1) is closed and the second switching element (S.sub.2) to charge a nodal voltage v.sub.D(t) at the first node (A). In discharge stage, the first switching element (S.sub.1) is open and the second switching element (S.sub.2) is open to enable discharging of the capacitive element (C) through the first element (D.sub.1). In a transfer stage, the second switching element (S.sub.2) is closed to connect the first node (A) and the second node (B), after which the second switching element (S.sub.2) is opened and the second element (D.sub.2) is biased to present the high-impedance load.

A radio receiver comprises a matched filter bank and a decision unit. The matched filter bank has a plurality of filter modules for generating correlation-strength data from a sampled radio signal, each filter module being configured to cross-correlate the sampled signal with data representing a respective filter sequence. The decision unit is configured to use the correlation-strength data to generate a sequence of decoded symbols from the sampled signal. The matched filter bank and/or decision unit are configured to determine the value of each symbol in the sequence in part based on the value of a respective earlier decoded symbol from the sequence of decoded symbols.

A class of design topologies in the field of nonlinear networks (NLN) or nonlinear transmission lines (NLTL) that re-utilize direct current (DC) and low-frequency (LF) signal content reflected from a load or an output filter to yield increased pulse to radio frequency conversion efficiency and increased overall system efficiency. A nonlinear transmission line topology comprises a plurality of series inductive elements and a plurality of nonlinear capacitive elements. The inductive elements and the capacitive elements are arranged in a periodic structure forming a nonlinear network. An output coupling circuit connected across an output of the nonlinear network is configured to transmit high-frequency content to a load and to reflect back direct current and low-frequency content into the nonlinear network.

A class of design topologies in the field of nonlinear networks (NLN) or nonlinear transmission lines (NLTL) that re-utilize direct current (DC) and low-frequency (LF) signal content reflected from a load or an output filter to yield increased pulse to radio frequency conversion efficiency and increased overall system efficiency. A nonlinear transmission line topology comprises a plurality of series inductive elements and a plurality of nonlinear capacitive elements. The inductive elements and the capacitive elements are arranged in a periodic structure forming a nonlinear network. An output coupling circuit connected across an output of the nonlinear network is configured to transmit high-frequency content to a load and to reflect back direct current and low-frequency content into the nonlinear network.

Some embodiments include a nonlinear transmission line system comprising: a power supply providing voltages greater than 100 V; a high frequency switch electrically coupled with the power supply; a nonlinear transmission line electrically coupled with the switch; an antenna electrically coupled with the nonlinear transmission line; and an energy recovery circuit comprising a diode and an inductor electrically coupled with the power supply and the antenna.

Some embodiments include a nonlinear transmission line system comprising: a power supply providing voltages greater than 100 V; a high frequency switch electrically coupled with the power supply; a nonlinear transmission line electrically coupled with the switch; an antenna electrically coupled with the nonlinear transmission line; and an energy recovery circuit comprising a diode and an inductor electrically coupled with the power supply and the antenna.

A joining device includes: a first circuit in which a primary-side winding of a first transformer and a first capacitor are connected; a second circuit in which a primary-side winding of a second transformer and a second capacitor are connected; an electrode connected to secondary-side winding of the first transformer and secondary-side winding of the second transformer; and a charge switch configured to switch between energization/de-energization of the first and second capacitors from a power supply without the transformers being interposed. The first circuit has a first discharge switch and the second circuit has a second discharge switch. A method for manufacturing a joined object includes, by using the joining device, supplying an object to be joined to be sandwiched by the electrode; causing a current to flow through the electrode that sandwiches the object to be joined to join the object to be joined.