Epcos Ag

Snaptrack Incorporated

Jürgen Kiwitt

Maximilian Pitschi

Robert Koch

Edgar Schmidhammer

Pasi Tikka

Habbo Heinze

Tilo Gärtner

Reiner Welzer

Guillermo Moreno Granado

A circuit arrangement can be used for adapting the electroacoustic properties of an electroacoustic component. The circuit arrangement includes a first conductor loop and a further element. The first conductor loop includes a main loop and a negative feedback loop. The negative feedback loop has a sense of curvature that is opposite to a sense of curvature of the main loop. The negative feedback loop compensates for a coupling between the main loop and the further element.

Circuit arrangement

An RF component can have a reduced electromagnetic internal coupling and may be suitable for miniaturization as a result. The component includes a micro acoustic filter of ladder-type design in a housing and a double coil having a first coil segment and a second coil segment. The two coil segments are oriented in opposite directions. The two coil segments are arranged without crossover in one layer and the double coil is arranged in proximity to a parallel branch resonator of the ladder-type filter structure.

RF component with reduced coupling and suitable for miniaturization

The invention relates to a micro-acoustic filter having a first and a second converter, in which the electromagnetic and capacitive cross-talk between the first and second converters is compensated for by providing additional coupling capacitors and additional current loops. Additional coupling capacitors and current loops are arranged in such a manner that they can counteract the sign of the natural coupling specified by the design and thus completely compensate for said coupling.

Micro-acoustic filter having compensated cross-talk and method for compensation

A duplexer is proposed with a substrate which has at least one patterned metallization plane and on which, at least to some extent, a transmission path (TX) and a reception path (RX) are arranged, both of which are connected to an antenna connection (ANT). The duplexer comprises a transmission filter (TXF) which is arranged in the transmission path (TX) and which has a first acoustic wave filter (BAW) with one or more resonators. Furthermore, the duplexer (DPL) comprises a reception filter (RXF) which is arranged in the reception path (RX) on the antenna side and which has a second acoustic wave filter (BAW) with one or more resonators and also a single-ended output. In addition, the duplexer comprises, in the reception path (RX), a balun (BL) which is connected downstream of the reception filter (RXF) and the output of which delivers a balanced signal and which is in the form of an LC circuit, wherein at least one inductance and/or at least one capacitance of the balun (BL) are implemented in the patterned metallization plane of the substrate.

Duplexer with balun

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.

Growing community of inventors

Munich, Germany

Jürgen Kiwitt