Qualcomm Incorporated

Rf360 Singapore Pte. Ltd.

Epcos Ag

Snaptrack Incorporated

Stefan Freisleben

Patric Heide

Georgiy Sevskiy

Wai San Wong

Steve Andre Beaudin

Mykola Shevelov

David J Maldonado

Alexander Chernyakov

Petro Komakha

Francis Ming-Meng Ngai

Christian Block

Thomas Bauer

Michael Kohlmann

Markus Mayer

Christoph Eggs

Ryan Scott Castro Spring

Peter Hagn

Marc Esquius Morote

Marcel Giesen

Matthias Jungkunz

Eyal Hochdorf

Manuel Sabbagh

Thomas Baier

Stefan Ammann

Ilya Lukashov

Oleksandr Gavryliuk

Peter Stoehr

Ulrich Bauernschmitt

Ulrike R&ouml;sler

Markus Ali-Hackl

Thomas Telgmann

Volodymyr Novgorodov

Kostyantyn Markov

Igor Ielegechev

Bohdan Bravichev

Oleksandr Ruban

Thomas Forster

Vikrant Chauhan

Thomas Johannes

Andreas Waldherr

Michael Schmachtl

An apparatus is disclosed for a surface-acoustic-wave filter with an electrical conductor having a floating potential. In an example aspect, the apparatus includes a surface-acoustic-wave filter with a piezoelectric layer and an electrode structure disposed on a surface of the piezoelectric layer. The electrode structure includes a first comb-shaped structure and a second comb-shaped structure. The electrode structure also includes at least one electrical conductor positioned between the first comb-shaped structure and the second comb-shaped structure such that a gap separates the at least one electrical conductor from the first comb-shaped structure and the second comb-shaped structure.

Surface-acoustic-wave (SAW) filter with an electrical conductor having a floating potential

In an example, an apparatus includes first and second antennas and a switched extractor coupled to the first antenna. The switched extractor includes an extractor configured to extract an extraction frequency band, a bypass line, and switching circuitry. The switching circuitry is configured to selectively establish a bypass signal path including the bypass line or a concurrent signal path including the extractor. The apparatus also includes first and second transceiver units (TRXUs) and a processor. The first TRXU is coupled to the first antenna via the switched extractor. The second TRXU is coupled to the first antenna via the switched extractor and coupled to the second antenna. The processor is configured to cause the switching circuitry to selectively connect the first TRXU to the first antenna via the bypass or the concurrent signal path based on the extraction frequency band and an operational frequency band associated with the first TRXU.

Enhanced antenna utilization

A filter device having a reduced sensitivity to production tolerances comprises a multilayer panel with integrated wiring, a piezoelectric substrate mounted to the panel. A first filter circuit (FC) and a signal path (SP) comprising a second filter circuit are realized on the substrate and connected to a common antenna terminal (AT) as well as to a common node (CN) located on top of the piezoelectric substrate. A first matching circuit (MC) and further matching circuits (MC) are realized by the wiring in the multilayer panel.

Filter device comprising two connected filter circuits

Electroacoustic devices with a capacitive element and methods for fabricating such electroacoustic devices. An example method includes forming an acoustic device above a first region of a substrate, and forming a capacitive element above a second region of the substrate and adjacent to the acoustic device. The forming of the capacitive element may include forming a protective layer above the substrate where a first portion of the protective layer is above the second region of the substrate and a second portion of the protective layer is above the first region of the substrate, forming a dielectric region above the protective layer, and forming an electrode above the dielectric region. The dielectric region may include a different material than the protective layer.

Etch stop and protection layer for capacitor processing in electroacoustic devices

Certain aspects of the present disclosure provide a filter circuit and techniques for filtering using the filter circuit. The filter circuit generally includes a first filter stage having a first acoustic wave resonator coupled in a series path between a first port of the filter circuit and a second port of the filter circuit, a first inductor-capacitor (LC) tank circuit, a first capacitor coupled between a first terminal of the first acoustic wave resonator and the first LC tank circuit, the first LC tank circuit being coupled between the first capacitor and a reference potential node, and a second capacitor coupled between a second terminal of the first acoustic wave resonator and the first LC tank circuit. In some aspects, the filter circuit includes one or more other filter stages coupled to the first filter stage.

Acoustic-wave-based filter for wideband applications

An apparatus is disclosed with an absorptive filter. In an example aspect, an apparatus has a filter including a first filter port and a second filter port. The filter also includes a hybrid coupler, a signal combiner, a first filter unit, and a second filter unit. The hybrid coupler includes a first hybrid port, a second hybrid port, and a third hybrid port, with the first hybrid port coupled to the first filter port. The signal combiner is coupled to the second filter port. The first filter unit is coupled between the second hybrid port and the signal combiner. The second filter unit is coupled between the third hybrid port and the signal combiner.

Absorptive filter

Certain aspects of the disclosure related to communications apparatus provides isolation between wireless protocols when operating currently while incurring the additional insertion loss based on providing the isolation only when needed. In an aspect, an apparatus include a switched filter coupled to an antenna where the switched filter includes a filter and a bypass line along with switching circuitry configured to selectively establish a bypass signal path including the bypass line or a filtered signal path including the filter. The apparatus further includes a switched filter controller configured to cause the switching circuitry to selectively connect a transceiver unit to the antenna via the bypass signal path or via the filtered signal path based at least on a frequency band of a carrier signal and a bandwidth of the carrier signal.

Apparatus and method for controlling a switchable filter for coexistence between wireless protocols

For a reactance filter constructed from serial and parallel resonators, in order to improve the linearity, it is proposed to connect a capacitor in series or in parallel either with a parallel resonator or a cascade of parallel resonators or with a series resonator or a cascade of series resonators.

Filter with improved linearity

A front end module has two signal paths for operation in two different frequency ranges which can be operated both with one antenna in the multiplex operating mode and with two antennas in a second operating mode. The respective operating mode is actuated via corresponding contact being made with the module substrate, and therefore by the user.

Front end module and method of operation in different circuit environments

For improving the matching of a DMS track that is connected in series with a reactance element, it is proposed to connect a shunt branch to ground between the DMS track and reactance element parallel to the signal-carrying conductor section, where a capacitive element is arranged in this shunt branch.

DMS filter with improved matching

A surface acoustic wave filter having compensated capacitive and inductive crosstalk between adjacent IDT input and output transducers includes electromagnetically coupled transducers split into partial transducers. The routing of the partial transducer pads is modified such that the flux directions of the magnetic couplings between the adjacent partial transducers are oppositely directed so that the total induced magnetic flux is zero. The partial transducers are connected in series or in parallel such that, in the case of symmetric operation, the crosstalk capacitances between adjacent pads and transducer surfaces are balanced at the corresponding port.

Surface acoustic wave filter having balanced crosstalk capacitances in symmetric operation

Growing community of inventors

Neubiberg, Germany

Stefan Freisleben