Epcos Ag

Nokia Corporation

Nokia Mobile Phones Limited

Infineon Technologies Ag

Qualcomm Incorporated

Snaptrack Incorporated

Qualcomm Technologies, Inc.

Pasi Tikka

Edgar Schmidhammer

Juha Ell&auml;

Juha Ellä

Jyrki Kaitila

Habbo Heinze

Ralph Stömmer

Pekka Ikonen

Gerhard Zeller

Pasi Lehtonen

Robert Aigner

Juha Sakari Ella

Reiner Welzer

Christian Block

Thomas Metzger

Andreas Bergmann

Markus Mayer

Peter Hagn

Kurt Wiesbauer

Andreas Przadka

Ansgar Schäufele

Marko Alanen

Jürgen Kiwitt

Günter Kovacs

Michael Unterberger

Hans-Jörg Timme

Katri Helena Pohjonen

Lüder Elbrecht

Manfred Stadler

Jarmo Valtonen

Harri Pellikka

Sami Kalajo

Herbert Zidek

Juha EllÄ

Ansgar Schaufele

Jörg Schuler

A circuit arrangement includes a transceiver unit, a switching device coupled to the transceiver unit with a terminal and a control device coupled to the switching device. The control device is configured to operate in a first and in a second mode of operation. In the first mode of operation, the switching device is configured by the control device such that a first signal is routed from the transceiver unit via the switching device back to the transceiver unit in a feedback loop. In the second mode of operation, the switching device is configured by the control device such that a second signal is routed from the transceiver unit via the switching device to the terminal or the second signal is routed from the terminal via the switching device to the transceiver unit.

Circuit arrangement for RF loopback

A front-end circuit for a wireless communication unit includes at least two antenna feeds. At least one of the antennas is coupled to an antenna switch. The circuit comprises filters and duplexers and is prepared to operate a number of FDD frequency bands. Each FDD band comprises an Rx band for receive signals and a Tx band for transmit signals. The circuit provides a single band operation mode for each frequency band and aggregated band operation modes. In an aggregated band operation mode Rx signals can be received in two different frequency bands at the same time as well as Tx signals can be transmitted in at least one of the two different frequency bands. In addition, TDD bands as well as GSM bands are covered.

Front-end circuit for band aggregation modes

A directional coupler, comprising a first high-frequency line for feeding a first high-frequency signal, a second high-frequency line for feeding a second high-frequency signal, and a coupling line for outputting signals from the first and the second high-frequency lines, wherein the coupling line comprises resistive segments, each comprising a predetermined impedance. Coupling properties and resistive damping and adapting properties can be integrated in the coupling line. A compact and low-cost construction of the directional coupler is thus made possible.

Directional coupler

A front end module for a wireless transmission/reception device has two antennas and two signal paths connected thereto. A mismatch in the antenna is identified by monitoring the transmitted power and the reflected power in the active and passive signal paths and using the powers in a controller to generate a control signal for the antenna tuner. In this case, decreasing isolation between the first and second antennas and the first and second signal paths is identified, and is compensated for using different devices, in order to ensure faster and safer antenna matching.

Front end module comprising an antenna tuner

A broadband-operable impedance filter has capacitive elements of variable capacitance in the signal path, an inductive element in a parallel path connected in parallel to the signal path, and inductive elements in the ground path. The impedance filter allows communication in a first frequency band and the reception of HF signals in a second frequency band.

Impedance matching circuit capable of broadband operation

An apparatus for wirelessly transmitting information includes a transmitting/receiving unit and an antenna unit. An electrical signal path is between the transmitting/receiving unit and the antenna unit. A front-end module contains at least one duplexer and is electrically connected into the signal path between the transmitting/receiving unit and the antenna unit. A detector unit is used for detecting signals proportional to radio-frequency signals propagating in the signal path. The detector unit is electrically coupled to the signal path between the transmitting/receiving unit and the front-end module.

Apparatus for wirelessly transmitting information, communication terminal for wirelessly transmitting information and impedance matching method

The present invention concerns a front-end circuit (FEC) that is connectable to at least two radiators (RADM, RADD), wherein the front-end circuit (FEC) comprises sub-circuits (SC) and each sub-circuit (SC) is associated to one radiator (RADM, RADD). Further, each sub-circuit (SC) comprises a signal path (SP), an antenna port (AP) that is electrically coupled to the signal path (SP) and connectable to the radiator (RADM, RADD), a grounding port (GP) that is connectable to the radiator (RADM, RADD), a ground termination circuit (GTC), and a grounding switch (GS) that is electrically coupled to the grounding port (GP) and to the grounding termination circuit (GTC).

Front-end circuit

Mobile communication devices with improved antenna performance are provided. A mobile communication device includes a first antenna, a ground plane, and a diversity antenna. In a mode of operation which is not a multi-antenna transmission mode, the diversity antenna is electrically coupled to the ground plane. The diversity antenna increases the electrical length of the ground plane and enhances the antenna performance of the radiating assembly of the first antenna in combination with the ground antenna and the diversity antenna.

Mobile communication device with improved antenna performance

A circuit arrangement for a mobile radio device includes a first transmission path for a first communication system with TDD duplex operation and a second transmission path for a second communication system with FDD duplex operation. The first transmission path contains a first transmission filter and the second transmission path contains a first duplexer. The first and second communication systems use transmission frequency bands that are arranged within the same octave. A transmitted signal from the first communication system can be routed switchably and thus either via the first or the second transmission path.

Circuit configuration for a mobile radio device and method for operating the same

An antenna arrangement has a first signal path connected to a first antenna. A second signal path is connected to a second antenna. A third signal path includes a device that measures the signal strength. Directional couplers couple the first and second signal paths to the third signal path. Filters filter out signal components that are coupled by one antenna into the other antenna.

Antenna arrangement

A front-end circuit includes a signal path and a first antenna port. A first antenna switch is electrically connected to the first antenna port. A second antenna port is electrically connectable or connected to the signal path. An antenna termination circuit is electrically connected to the first antenna switch. The antenna termination includes an impedance element. The first antenna switch electrically connects the first antenna port to the antenna termination circuit when the signal path is electrically connected to the second antenna port.

Front-end circuit for improved antenna performance

The invention relates to a filter operating with bulk acoustic waves, comprising at least one first resonator and at least one second resonator. In the at least one first and second resonator, a longitudinal acoustic mode is capable of propagation, for which normal dispersion is adjusted in the first resonator and abnormal dispersion in the second resonator by selection of the material and the relative layer thicknesses. In particular, the power compatibility of the filter at the higher frequency edge of its passband can be improved.

Bulk acoustic wave resonator filter

An arrangement includes a substrate, a filter, a first bulk acoustic wave resonator, a second bulk acoustic wave resonator, and a large surface covering. The first bulk acoustic wave resonator includes a first electrode and a second electrode and is arranged flatly on the substrate. The second bulk acoustic wave resonator includes a first electrode and a second electrode and is arranged flatly on the substrate. The large-surface covering includes a metal layer over the substrate. The metal layer is connected to a ground terminal.

Filter assembly comprising two bulk wave resonators

An electrical circuit that includes an electric four-terminal network is disclosed. The electric four-terminal network includes a first electrical port with a first terminal and a second terminal and a second electrical port with a first terminal and a second terminal. The electrical circuit also includes a first shunt branch between the second terminal of first electrical port and ground.

Electrical circuit and component with said circuit

The invention relates to a resonator operating with bulk acoustic waves (BAW resonator, BAW=Bulk Acoustic Wave) and band-pass filters constructed of such resonators. To increase the edge steepness of the transmission band of a BAW band-pass filter, the invention proposes reducing the effective coupling of a BAW resonator by using the connection in parallel of a BAW resonator and a capacitor instead of only one resonator. In addition, to increase the edge steepness of the transmission band, the use of a connection of coupled BAW resonators in the serial branch of a filter circuit with another resonator or resonator stack in the parallel branch of the filter circuit is proposed, the additional resonator or resonator stack being connected to the center electrode of the resonator stack specified initially.

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Munich, Germany

Pasi Tikka