Adjustable capacitor and circuit provided therewith
AssigneeEpcos AG
InventorsAnton Leidl, Wolfgang Sauer, Stefan Seitz
Life of this patent
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Abstract
A capacitor includes a multi layer structure on a ceramic or crystalline substrate. The multilayer structure includes a lower electrode, an upper electrode, and a dielectric that is tunable by a voltage applied to the electrodes. The multilayer structure is configured such that resonant oscillation modes of bulk acoustic waves can be propagated in the multilayer structure and such that the resonant frequencies of the oscillation modes are outside a first band range of between 810 and 1000 MHz, second band range of between 1700 and 2205 MHz and third band range of between 2400 and 2483.5 MHz.
Claims22
A capacitor with a tunable dielectric constant, the capacitor comprising:
- a multilayer structure on a ceramic or crystalline substrate, the multilayer structure comprising:
- a lower electrode;
- an upper electrode;
- and
- a dielectric between the lower electrode and the upper electrode, the dielectric being tunable by a voltage applied to the electrodes,
- wherein the multilayer structure is configured such that resonant oscillation modes of bulk acoustic waves can be propagated in the multilayer structure and a number of layers, material of the layers, and thicknesses of the layers in the multilayer structure are configured such that the resonant frequencies of the oscillation modes are outside a first hand range used in mobile telephones of between 810 and 1000 MHz, second band range used in mobile telephones of between 1700 and 2205 MHz and third band range used in mobile telephones of between 2400 and 2483.5 MHz.
An electrical circuit comprising:
- a capacitor comprising:
- a multilayer structure on a ceramic or crystalline substrate, the multilayer structure comprising:
- a lower electrode;
- an upper electrode;
- and
- a dielectric between the lower electrode and upper electrode, the dielectric being tunable by a voltage applied to the electrodes,
- wherein the multilayer structure is configured such that resonant oscillation modes of bulk acoustic waves can be propagated in the multilayer structure and a number of layers, material and thicknesses of the layers in the multilayer structure are configured such that the resonant frequencies of the oscillation modes are outside a first band range used in mobile telephones of between 810 and 1000 MHz, second band range used in mobile telephones of between 1700 and 2205 MHz and third band range used in mobile telephones of between 2400 and 2483.5 MHz;
- one or more passive circuit components connected to the capacitor, the passive circuit components being selected from the group consisting of capacitors, inductors, and resistors,
- wherein the circuit is configured to process signals in at least one of the first, second, or third band ranges.
Dependencies are inferred from the claim text.