Passive filters, line replaceable units and a modular power supply are provided. In one example the modular power supply has a DC bus link having a positive line and a negative line with at least one passive filter and an inductor having a first end and a second end, the first end coupleable to a phase output. A diode bridge having at least a first diode and a second diode, with an anode of the first diode coupleable to the second end of the inductor and a cathode of the first diode coupleable to the positive line, wherein a cathode of the second diode is coupleable to the second end of the inductor and an anode of the second diode is coupleable to the negative line, and wherein the first diode and the second diode are each configured to produce a combined reverse recovery charge that achieves a target DV/DT for an output voltage of the at least one passive filter.

Aspects of this disclosure relate to a hybrid acoustic LC filter cascaded with a non-acoustic LC filter. The hybrid acoustic filter can filter a radio frequency signal. The hybrid acoustic LC filter can include acoustic resonators, an inductor, and a capacitor. The inductor and capacitor can be external to an acoustic resonator die. The non-acoustic LC filter includes an LC circuit. Related multiplexers, wireless communication devices, and methods are disclosed.

A technique relates to a lossless microwave switch discussed herein. Multiple ports are included in the lossless microwave switch. Tunable filters are included in the lossless microwave switch. Each of the ports is operatively coupled a corresponding one of the tunable filters.

The fault location of a fault on a line of an electrical energy supply network is determined. First and second current and/or voltage values are measured and provided with a timestamp at the line ends of the line. Following the occurrence of a fault, the timestamped first and second values are used to determine the fault location. Profiles of travelling waves propagating along the line towards the line ends when the fault occurs are determined from the timestamped first and second values at both line ends. The fault location is defined from the profiles of the travelling waves from a time difference with which the travelling waves arrive at the two line ends. The time difference is derived from a pattern comparison of the profiles of the travelling waves determined for the line ends.

Passive device assembly for accurate ground plane control is disclosed. A passive device assembly includes a device substrate conductively coupled to a ground plane separation control substrate. A passive device disposed on a lower surface of the device substrate is separated from an embedded ground plane mounted on a lower surface of the ground plane separation control substrate by a separation distance. The separation distance is accurately controlled to minimize undesirable interference that may occur to the passive device. The separation distance is provided inside the passive device assembly. Conductive mounting pads are disposed on the lower surface of the ground plane separation control substrate to support accurate alignment of the passive device assembly on a circuit board. By providing sufficient separation distance inside the passive device assembly, the passive device assembly can be precisely mounted onto any circuit board regardless of specific design and layout of the circuit board.

Integrated filter and electromagnetic coupler assemblies. In certain examples, an integrated filter and electromagnetic coupler assembly includes a filter having a capacitance and a series inductance, the series inductance being connected between an input port and an output port of the integrated filter and electromagnetic coupler assembly, and combination of the capacitance and the series inductance being selected to provide the filter with a passband and a stopband. The integrated filter and electromagnetic coupler assembly further includes a coupling element positioned physically proximate the series inductance and extending between a coupled port and an isolation port of the integrated filter and electromagnetic coupler assembly, the integrated filter and electromagnetic coupler assembly being configured to provide at the coupled port a coupled signal via inductive coupling between the series inductance and the coupling element responsive to receiving an input signal at the input port.

The present subject matter relates to systems, devices, and methods for adaptively tuning antenna elements and/or associated filter elements to support multiple frequency bands. For example, a tunable filter having an input node and an output node can be selectively tunable to define one or more pass bands associated with one or more first signal bands and one or more reject bands associated with one or more second signal bands. The tunable filter can be configured to pass signals having frequencies within the first signal bands between the input node and the output node and to block signals having frequencies within the second signal bands. Furthermore, the tunable filter can be configured to selectively tune the pass bands to have a minimum pass band insertion loss at any of a variety of frequencies, including frequencies that are greater than and less than frequencies within the reject bands.

There is provided a variable RF filter receiving an input differential radio frequency signal from a differential input terminals (501, 502) and allowing a radio frequency signal around a desired frequency to pass therethrough, wherein first passive mixers (901, . . . , 904) driven by a rectangular wave clock signal having an arbitrarily determined frequency are connected in parallel to a signal line across the differential input terminals (501, 502) and differential output terminals (918, 919), and wherein a load of each of the first passive mixers (901, . . . , 904) is configured by inductors (903, . . . , 906). Further, as a clock signal driving each of the first passive mixers (901, . . . , 904), an odd-multiple-wave Lo signal (for example, a triple-wave Lo signal) is used, the signal having a frequency odd-multiple times (for example, three times) as high as that of the Lo signal which is the fundamental wave of the passing radio frequency signal.

A diplexer module includes substrates, an external connection terminal, a first diplexer including a first transmission filter and a first reception filter, a second diplexer including a second transmission filter and a second reception filter, and a switch. The external connection terminal is connected to the switch, the switch is connected to the first diplexer and the second diplexer, and the first transmission filter, the second transmission filter, the second reception filter, and the first reception filter are aligned in this order when the substrates are seen in plan view from above.

An RFID reader, tuning method and computer readable medium. A carrier signal is transmitted. A plurality of feedback signals produced in the RFID reader are measured when transmitting the carrier signal with a variable matching network set at a plurality of impedance values that are different from one another. It is determined which impedance value of the plurality of impedance values produced a feedback signal having a highest level of the plurality of feedback signals. The variable matching network is set to the determined impedance value.