Abstract: A microelectromechanical device having a mobile structure including mobile arms formed from a composite material and having a fixed structure including fixed arms capacitively coupled to the mobile arms. The composite material includes core regions of insulating material and a silicon coating.

Abstract: A high input impedance magnetic balun/transformer having a phase balancing network (PBN) and method of operating. The balun is fully configurable and trimmable post fabrication using independently adjustable resistive and reactive parts by changing the resistance of a programmed transistor, e.g., NMOS. Parallel connected legs each having a field effect transistors (FETs) that make up NMOS device alter the impedance at the balun output terminals. The ground terminal of a secondary winding or coil at an unbalanced, single-ended side is connected to a phase balancing network. The phase balancing network includes at least two parallel legs, each leg having a resistive element in the form of a transistor device and at least one leg including a capacitive element. The transistor device at a leg can be operated in a linear region to trim the resistance and capacitances at the unbalanced side in order to achieve proper phase balancing and amplitude matching.

Abstract: A directional coupler having coupling variability at separate portions of an operational frequency band. A frequency selective coupler comprises an input port, an output port, a coupled port, a termination port, a first RF filter coupled to the coupled port, and a second RF filter coupled to the termination port. The first and second RF filters yield a first coupling value at a first portion of the operational frequency band of the coupler and a second coupling value at a second portion of the operational frequency band. The first portion of the band corresponds to a range of frequencies at which higher coupling for the coupler is desired and greater loss in the signal is tolerable. The second portion of the band corresponds to a range of frequencies at which lower coupling for the coupler is tolerable and lower loss in the signal is desirable.

Abstract: A first filter of a multiplexer has a ladder filter structure including a plurality of series resonators and a plurality of parallel resonators. Each resonator is an acoustic wave resonator that includes an IDT electrode including a pair of comb-shaped electrodes. A portion having a unit area, in a plan view of a substrate on which the resonators are provided, has a larger weight in at least one of the IDT electrode of the series resonator that is closest to the common terminal, among the series resonator, and the IDT electrode of the parallel resonator that is closest to the common terminal than in the IDT electrode of each of the remainder of the plurality of acoustic wave resonators.

Abstract: A filter circuit has a first frequency band as a pass band and a second frequency band as an attenuation band. The filter circuit includes a 90-degree hybrid coupler, a first filter that is connected to the 90-degree hybrid coupler and has the first frequency band as a pass band, and a second filter that is connected to the 90-degree hybrid coupler and has the second frequency band as a pass band. The second filter includes a first inductor, a resonant circuit, and a second inductor connected in series in this order, a first capacitive element connected between a node on a signal path connecting the first inductor and the resonant circuit and a ground electrode, and a second capacitive element connected between a node on a signal path connecting the second inductor and the resonant circuit and a ground electrode.

Abstract: A high-frequency device includes: a circuit substrate including dielectric layers that are stacked, wiring patterns located on at least one of the dielectric layers, and a passive element formed of at least one of the wiring patterns, the circuit substrate having a first surface that is a surface of an outermost dielectric layer in a stacking direction of the dielectric layers; a terminal for connecting the high-frequency device to an external circuit, the terminal being located on the first surface and electrically connected to the passive element through a first path in the circuit substrate; and an acoustic wave element located on the first surface and electrically connected to the passive element through a second path in the circuit substrate.

Abstract: In an acoustic wave device, in a rotated Y-cut crystal substrate to which a rotational angle based on a particular Euler angle is added, a vibration mode located farther in a low phase velocity area than the principal vibration has an electromechanical coupling coefficient K2 lower than that of the principal vibration, and the primary and secondary temperature coefficients of the principal vibration are approximately zero. The acoustic wave device includes a crystal substrate cut from a quartz crystal boule cut by a rotational angle specified by a right-handed Euler angle (?, ?, ?), and at least one comb-shape excitation electrode to excite the crystal substrate to make a plate waves. The crystal substrate is made by cutting the quartz crystal boule such that the rotational angle is within ranges of ?=0±2°, ?=17.5° to 19.5°, and ?=0±2°.

Abstract: A non-reciprocal microwave network is provided that includes an in-line ferromagnetic element [1010] with adjoining polarizing adapters [1002, 1004, 1006, 1008] to achieve directivity via a multi-mode interaction at or near the ferrite to act as new class of 4-port circulator or 2-port isolator, with standard waveguide inputs for assembly in larger networks.

Abstract: An extractor includes a band pass filter and a band elimination filter. One filter of the band pass filter and the band elimination filter includes at least one serial arm resonator and at least one parallel arm resonator that are each defined by an acoustic wave resonator. Any one of the at least one serial arm resonator and the at least one parallel arm resonator includes, among a divided resonator group divided resonator including a plurality of divided resonators coupled in series to each other, a first divided resonator group that is a largest in number of the divided resonators coupled in series and a smallest in capacitance.

Abstract: Disclosed are various embodiments for exciting a guided surface waveguide probe to create a plurality of resultant fields that are substantially mode-matched to a Zenneck surface wave mode of a surface of a lossy conducting medium and embodiments for receiving energy from a Zenneck surface wave launched on the lossy conducting medium.

Abstract: According to one embodiment, there is provided a magnetic coupling device including a first coil, a second coil, a third coil, a fourth coil, a first constant-potential node and a second constant-potential node. The second coil is electrically connected with one end of the first coil and wound in a direction opposite to a direction in which the first coil is wound. The third coil faces the first coil. The fourth coil faces the second coil. The first constant-potential node is electrically connected with one end of the third coil. The second constant-potential node is electrically connected with one end of the fourth coil.

Abstract: A microfabricated RF filter uses a resonant cavity weakly coupled to a transmission line, to attenuate noise sources emitting interference into the RF radiation at the resonant frequency. Radiation at the resonant frequency is leaked into the resonant cavity and build up there, until it is dumped to ground by a switch.

Abstract: Acoustic wave devices are disclosed. An acoustic wave device can include a first filter and a second filter coupled to a common node. The second filter includes acoustic wave resonators of a first type (e.g., bulk acoustic wave resonators) and a series acoustic wave resonator of the second type (e.g., a surface acoustic wave resonator) that is coupled between the acoustic wave resonators of the first type and the common node. The acoustic wave device can further include a loop circuit coupled to the first filter, in which the loop circuit is configured to generate an anti-phase signal to a target signal at a particular frequency. In certain embodiments, the first filter is a receive filter and the second filter is a transmit filter.

Abstract: A filter device utilizing surface acoustic waves includes one or more series arm resonators connected to each other along a path between a first input/output terminal and a second input/output terminal, and three or more parallel arm resonators each connected between a connection node provided on the path and ground and defining the pass band of the filter device. Parallel arm resonators having different anti-resonant frequencies from each other are included. Parallel arm resonators among the three or more parallel arm resonators are connected to the same connection node provided along the path. Remaining parallel arm resonators are connected to different connection nodes from the same connection node. The anti-resonant frequencies of the parallel arm resonators connected to the same connection node are identical and are the lowest anti-resonant frequencies among the anti-resonant frequencies of the three or more parallel arm resonators.

Abstract: A duplexer included in a radio frequency module is used in a communication band in which the transmit band in a single communication band includes a first transmit band and a second transmit band overlapping each other and in which the receive band in the single communication band includes a first receive band and a second receive band overlapping each other. A transmit filter unit in the duplexer uses, as a pass band, a fixed frequency band including the first transmit band and the second transmit band. A receive filter unit of the duplexer uses, as a pass band, a fixed frequency band including the first receive band and the second receive band.

Abstract: Embodiments of the invention include waveguide switch rotors, stators, waveguide switch housings and meander clamping mechanisms. In particular, the waveguide switch rotor design employs isolation posts surrounding waveguide ports disposed on the external face of the rotor to achieve an artificial magnetic boundary condition to achieve high isolation with improved gap from rotor to stator.

Abstract: 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.

Abstract: Disclosed is a capacitive non-directional coupler having a non-directional coupler printed circuit board (PCB) and a capacitive attenuator. The non-directional coupler PCB includes a coupler section configured to carry energy travelling on a main transmission line. The non-directional coupler PCB and the capacitive attenuator are configured as a capacitive voltage divider, and provide a sample of the energy on the main transmission line. Also disclosed is a method for measuring for measuring RF power using an RF power sensor having the capacitive non-directional coupler that includes with the non-directional coupler printed circuit board and the capacitive attenuator. Also disclosed is an RF power metering system that includes an RF power sensor having the capacitive non-directional coupler.

Abstract: A multi-resonator filter has a signal input terminal, a signal output terminal, and a plurality of resonator components. The plurality of resonator components include an input resonator component coupled to the signal input terminal, an output resonator component coupled to the signal output terminal, and at least one intermediate resonator component coupled between the input resonator component and the output resonator component. The input resonator component, output resonator component and the at least one intermediate resonator component are arranged in a sequence to define a signal path between the signal input terminal and the signal output terminal. The at least one intermediate resonator component includes at least one multiple resonator component, where each multiple resonator component includes a pair of individual resonators coupled in parallel where each individual resonator in a given pair of individual resonators has the same resonant frequency.

Abstract: An acoustic wave filter includes: a series-arm resonator disposed on a path that connects input/output terminals; and a parallel-arm circuit connected to a node on the path and a ground. The parallel-arm circuit includes a parallel-arm resonator and a capacitor connected in parallel to each other. The capacitor includes a comb-shaped electrode that includes electrode fingers. A frequency at which impedance of the capacitor has a local maximum value is located outside a passband of the acoustic wave filter. The comb-shaped electrode has at least two different electrode finger pitches or at least two different electrode finger duty ratios.