An object is to provide a stepped impedance resonator capable of efficiently reducing a footprint. A resonator includes a coplanar waveguide and a section. The coplanar waveguide has a first impedance. The section has a second impedance different from the first impedance and includes a fishbone waveguide. The resonator is configured as a stepped impedance resonator in which the coplanar waveguide and the section including the fishbone waveguide are connected in series.

The present invention provides filter assemblies, tuning elements and a method of tuning a filter. A filter assembly includes a housing having a top cover, a bottom cover and at least one sidewall, the top cover, the bottom cover and the at least one sidewall defining an internal cavity, the housing configured to receive first through third radio frequency (RF) transmission lines; a top metal sheet mounted within the internal cavity that has a plurality of openings that form a first hole pattern; and a bottom metal sheet mounted within the internal cavity that has a plurality of openings that form a second hole pattern. The top and bottom metal sheets are vertically spaced-apart from each other in a vertically stacked relationship within the internal cavity. The top metal sheet and the bottom metal sheet each include at least one resonator.

In described examples, a radio frequency (RF) resonator including a cavity and a tuning component, where the cavity includes a resonance property that can be changed in response to the tuning component. A transmitter generates an RF signal at each of a set of determined frequencies for transmitting individually within the cavity. A receiver receives the RF signal transmitted individually at each of the determined frequencies and determines a respective amplitude for each of the determined frequencies.

Techniques and mechanisms for changing a permittivity of a liquid crystal (LC) cell that is to facilitate a radiating or guiding of a radio frequency electromagnetic wave. In an embodiment, a device includes electrodes coupled to variously apply different electrical fields to the LC cell at different times. At one time, a first electrical field is applied to increase an average alignment of polar LC molecules with a first axis. At another time, a second electrical field is applied to decrease the average alignment of such polar LC molecules with the first axis. The first electrical field and the second electrical field have different respective directions at a first location of the LC cell. In another embodiment, the first electrical field is applied with a first plurality of electrodes and the second electrical field is applied with a second plurality of electrodes that is different than the first plurality of electrodes.

An apparatus includes a lower plate, an upper plate above the lower plate, and a plurality of vias extending from the lower plate to the upper plate. The lower plate, the upper plate, and the plurality of vias include conductive material. A post including conductive material extends from the lower plate and towards the upper plate. An inner plate including conductive material is above and in contact with the post, where the post and the inner plate are separated from the upper plate by dielectric material. The plurality of vias are arranged to at least in part wrap around the post. A signal line extends between the lower and upper plates and at least in part wraps around the post, where the signal line extends through an opening between a first via and a second via of the plurality of vias. In an example, the apparatus is a resonator structure.

A tunable dual-band resonator and a tunable dual-band band-pass filter using the tunable dual-band resonator. The dual-band resonator is structured such that a stub is added to each half-wavelength resonator provided with half-wavelength resonator protrusions (capacity-component adjust parts). The dual-band resonator is made up of an odd-number mode resonator in a shape including a ground conductor disposed on the back surface of a dielectric body, and a strip conductor disposed on the top surface thereof, and an even-number mode resonator in such a shape as to be formed when the stub is connected to an end face on the opposite side of the open-end of the strip, characterized in that a dielectric rod having a circular cross section is provided in the space above the respective stubs and another dielectric rod having a circular cross section is provided in the space above the half-wavelength resonator protrusions.

The present invention provides filter assemblies, tuning elements and a method of tuning a filter. A filter assembly includes a housing having a top cover, a bottom cover and at least one sidewall, the top cover, the bottom cover and the at least one sidewall defining an internal cavity, the housing configured to receive first through third radio frequency (RF) transmission lines; a top metal sheet mounted within the internal cavity that has a plurality of openings that form a first hole pattern; and a bottom metal sheet mounted within the internal cavity that has a plurality of openings that form a second hole pattern. The top and bottom metal sheets are vertically spaced-apart from each other in a vertically stacked relationship within the internal cavity. The top metal sheet and the bottom metal sheet each include at least one resonator.

An acoustic-wave device with active calibration mechanism is provided. The acoustic-wave device with active calibration mechanism includes at least one adjustable acoustic-wave duplexer, a frequency discriminator and a control circuit. The adjustable acoustic-wave duplexer has a first terminal point, a second terminal point and a third terminal point. The adjustable acoustic-wave duplexer includes a TX filter, an RX filter, a first loop switch and a second loop switch. The first loop switch is used for conducting a first loop. The second loop switch is used for conducting a second loop. The control circuit adjusts the operating frequency of the TX filter according to a first loop calibration signal. The control circuit adjusts the operating frequency of the operating frequency of the RX filter according to the second loop calibration signal.

A tunable coupler for making a controllable coupling to at least a first qubit is disclosed. The tunable coupler includes a first constant coupling element and a tunable coupling element. The first constant coupling element forms a non-galvanic coupling interface to at least the first qubit at a first extremity that is distant from the tunable coupling element. The tunable coupling element is located adjacent to a non-galvanic coupling interface formed as an interface to a circuit element at a second extremity thereof.

A tunable dual-band resonator and a tunable dual-band band-pass filter using the tunable dual-band resonator. The dual-band resonator is structured such that a stub is added to each half-wavelength resonator provided with half-wavelength resonator protrusions (capacity-component adjust parts). The dual-band resonator is made up of an odd-number mode resonator in a shape including a ground conductor disposed on the back surface of a dielectric body, and a strip conductor disposed on the top surface thereof, and an even-number mode resonator in such a shape as to be formed when the stub is connected to an end face on the opposite side of the open-end of the strip, characterized in that a dielectric rod having a circular cross section is provided in the space above the respective stubs and another dielectric rod having a circular cross section is provided in the space above the half-wavelength resonator protrusions.