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AssigneeKoninklijke Philips Electronics N.V.
InventorsMareike Katharine Klee, Robert Frederick Milsom, Hans Peter Löbl, Rainer Kiewitt, Uwe Mackens, Martinus Hermanus Wilhemus Maria Van Delden, Wilhelm Georg Hermann, Olaf Wunnicke
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The invention describes a tunable filter arrangement with a plurality of resonators which are coupled to one another and of which there is at least one which comprises a piezoelectric component made of a ferroelectric material and to which a DC voltage source is connected. The application of a DC voltage to the resonator renders it possible to change its electrical properties and thus the overall filter characteristic. Furthermore, a transmitter, a receiver device, and a mobile telephone device with such a filter arrangement are disclosed, aswell as a tunable bulk acoustic wave resonator.
A tunable filter arrangement which comprises a substrate and provided thereon an arrangement of at least two resonators coupled to one another, of which resonators there is at least one which contains a piezoelectric component of a ferroelectric material and to which a DC voltage source is connected, the arrangement further comprising lower and upper electrodes, a reflection element said lower electrode and a second reflection element above said upper electrode.
A mobile telephone device provided with a tunable filter arrangement which comprises a substrate and provided thereon an arrangement of at least two resonators which are coupled to one another, of which resonators there is at least one which has a piezoelectric component made of a ferroelectric material and to which a DC voltage source is connected, the arrangement further comprising lower and upper electrodes, a reflection element below said lower electrode and a second reflection element above said upper electrode.
A transmitter provided with a tunable filter arrangement which comprises a substrate and provided thereon an arrangement of at least two resonators which are coupled to one another, of which resonators there is at least one which has a piezo electric component made of a ferroelectric material and to which a DC voltage source is connected, said transmitter comprising at least two reflection layers separated by at least one electrode.
A receiver provided with a tunable filter arrangement which comprises a substrate and provided thereon an arrangement of at least two resonators which are coupled to one another, of which resonators there is at least one which has a piezoelectric component made of a ferroelectric material and to which a DC voltage source is connected, and wherein a layer of said resonator separates two reflective layers.
Dependencies are inferred from the claim text.