Abstract:
The invention relates to a front-end circuit, suitable for a plurality of mobile wireless systems, for separating different frequency bands. According to the invention, separation of the frequency bands occurs by means of band-pass filters connected in parallel signal paths and executed on the basis of thin-layer resonators, which, as a result of their high quality, allow for a high degree of selection between the frequency bands.
Abstract:
Overlapped electrodes of an electrical component are dimensioned in such a way that when there is translational displacement of one electrode in relation to the electrode situated opposite, their area of overlap remains within a manufacturing tolerance β/2, and also remains constant within the tolerance limits when there is a simultaneous rotation of the electrodes with respect to one another. This is achieved in that the intersecting edge pairs of the overlapping electrodes are designed parallel to one another, whereby the length, measured in the direction parallel to the respective edge pair, of the corresponding electrode everywhere exceeds by β the corresponding length of the area of overlap.
Abstract:
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.
Abstract:
An electroacoustic transducer has reduced loss due to acoustic waves emitted in the transverse direction. For this purpose, a transducer comprises a central excitation area, inner edge areas flanking the central excitation area, outer edge areas flanking the inner edge areas, and areas of the busbar flanking the outer edge areas. The longitudinal speed of the areas can be set so that the excitation profile of a piston mode is obtained.
Abstract:
The invention relates to an amplifier module, comprising at least one amplifier (PA), an antenna port (ANT), a transmission port (TX), a reception port (RX), and a circuit arrangement having at least three 90 DEG hybrids (HYB1, HYB2, HBY3), which each divide a respective input signal into two output signals, wherein the two output signals have a relative phase shift of 90 DEG from each other, wherein the antenna port (ANT), the transmission port (TX), and the reception port (RX) are each connected to at least one 90 DEG hybrid (HYB1, HYB2, HBY3).
Abstract:
A circuit arrangement includes an antenna port, a transmission port, and a reception port, each of which is connected to one respective 90° hybrid that splits an input signal into two output signals that are in quadrature. The circuit arrangement also includes two duplexers which are connected in such a way that the two output signals emitted by the 90° hybrid that is connected to the transmission port constructively interfere on the antenna port, while spurious signals caused by the two output signals destructively interfere on the reception port.
Abstract:
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.
Abstract:
The invention concerns a component (B) operating with acoustic waves, in which the reflection and excitation are largely decoupled. For this purpose, a component comprises a dielectric (DL) which is arranged between an electrode finger (EF) and a piezoelectric substrate (PSU) and at least partially overlaps the electrode finger.
Abstract:
The invention relates to a directional coupler (1), comprising a first high-frequency line (2) for feeding a first high-frequency signal, a second high-frequency line (3) for feeding a second high-frequency signal, and a coupling line (4) for outputting signals from the first and the second high-frequency lines (2, 3), wherein the coupling line (4) comprises resistive segments (5a-5c, 15a-15c, 25a-25c, 35a-35c, 45a), each comprising a predetermined impedance. Coupling properties and resistive damping and adapting properties can be integrated in the coupling line (4). A compact and low-cost construction of the directional coupler (1) is thus made possible.
Abstract:
An acoustic wave filter having reduced non-linearities as well as a production method are disclosed. A filter comprises a first electroacoustic transducer having a first metallization ratio and a second electroacoustic transducer having a second metallization ratio. The metallization ratios range from 0.2 to 0.8, and the metallization ratio of the first transducer is no more than 0.8 times the metallization ratio of the second transducer.