The present invention relates to a tunable resonating arrangement comprising a resonator apparatus (10), input/output coupling (4) means for coupling electromagnetic energy into/out of the resonator apparatus, and a tuning device (3) for application of a biasing voltage/electric field to the resonat
The present invention relates to a tunable resonating arrangement comprising a resonator apparatus (10), input/output coupling (4) means for coupling electromagnetic energy into/out of the resonator apparatus, and a tuning device (3) for application of a biasing voltage/electric field to the resonator apparatus. The resonator apparatus comprises a first resonator (1) and a second resonator (2). Said first resonator is non-tunable and said second resonator is tunable and comprises a ferroelectric substrate (21). Said first and second resonators are separated by a ground plane ( 13) which is common for said first and second resonators, and coupling means (5) are provided for providing coupling between said first and second resonators. For tuning of the resonator apparatus, the biasing voltage/electric field is applied to the second resonator ( 2).
대표청구항▼
The invention claimed is: 1. A tunable resonating arrangement comprising: a resonator apparatus, input/output coupling means for coupling electromagnetic energy into/out of the resonator apparatus, a tuning device for application of a biasing voltage/electric field to the resonator apparatus, where
The invention claimed is: 1. A tunable resonating arrangement comprising: a resonator apparatus, input/output coupling means for coupling electromagnetic energy into/out of the resonator apparatus, a tuning device for application of a biasing voltage/electric field to the resonator apparatus, wherein the resonator apparatus comprises: a first resonator, a second resonator, wherein said first resonator is non-tunable, wherein said second resonator is tunable and comprises a ferroelectric substrate, wherein the first resonator and the second resonator work as a single resonator, a ground plane for separating said first and second resonators, the ground plane being common for said first and second resonators, coupling means for coupling said first and second resonators, wherein for tuning of the resonator apparatus, the biasing voltage/electric field is applied to the second resonator. 2. A tunable resonating arrangement according to claim 1, wherein the first resonator is a disk resonator or a parallel plate resonator. 3. A tunable resonating arrangement according to claim 1, wherein the second resonator is a disk resonator or a parallel plate resonator. 4. A tunable resonating arrangement according to claim 2, wherein the first resonator comprises a dielectric substrate, the electric permittivity of which substantially does not vary with biasing voltage applied to the second resonator, which is disposed between a first resonator first electrode and a first resonator second electrode, and in that the first resonator second electrode forms the ground plane. 5. A tunable resonating arrangement according to claim 4, wherein the dielectric substrate of the first resonator comprises LaAlO3, MgO, NdGaO3, Al2O3, or sapphire. 6. A tunable resonating arrangement according to claim 4, wherein the first resonator has a high quality factor (Q) which is approximately 105 to 5쨌105. 7. A tunable resonating arrangement according to claim 4, wherein the second resonator comprises a tunable ferroelectric substrate, a second resonator first electrode, and a second resonator second electrode, and in that the second resonator second electrode also forms the common ground plane, and thus the second resonator second electrode also is the first resonator second electrode. 8. A tunable resonating arrangement according to claim 7, wherein the ferroelectric substrate of the second resonator comprises SrTiO3, KTaO3, or BaSTO3. 9. A tunable resonating arrangement according to claim 4, wherein the first and second electrodes comprise a non-superconducting metal. 10. A tunable resonating arrangement according to claim 4, wherein the first and second electrodes comprise a superconducting material. 11. A tunable resonating arrangement according to claim 4, wherein the first and second electrodes comprise a high temperature superconducting material. 12. A tunable resonating arrangement according to claim 1, wherein upon application of a biasing voltage to said second resonator, electromagnetic energy is redistributed between the second and first resonators via the coupling means. 13. A tunable resonating arrangement according to claim 12, wherein the redistribution of electromagnetic energy is a function of the biasing voltage. 14. A tunable resonating arrangement according to claim 13, wherein the redistribution of electromagnetic energy from the second resonator to the first resonator increases with an increasing biasing voltage. 15. A tunable resonating arrangement according to claim 14, wherein the resonating frequency and the loss tangent of the second resonator increase with application of an increasing biasing voltage, and wherein the redistribution of electromagnetic energy from the second to the first resonator is increased, automatically compensating for the increased loss tangent of the second resonator by reducing influence thereof on the coupled resonator apparatus. 16. A tunable resonating arrangement according to claim 1, wherein the first and second resonators comprise respective thin film substrates. 17. A tunable resonating arrangement according to claim 1, further comprising at least two resonator apparatuses, and in that the common ground plane is common for the at least two resonator apparatuses which form a tunable filter. 18. A tunable resonating arrangement according to claim 1, wherein the coupling means comprises, for the resonator apparatus, a slot or an aperture in the common ground plane. 19. A tunable resonating arrangement according to claim 1, wherein the resonator is circular, square shaped, rectangular or ellipsoidal. 20. A tunable resonating arrangement according to claim 19, wherein the arrangement comprises a dual mode resonator apparatus, and wherein the resonator comprises a protrusion, a cut-out, or a pertubation to provide for dual mode operation. 21. A tunable resonating arrangement according to claim 1, wherein the resonator apparatus provides a two pole filter. 22. A tunable resonator apparatus comprising: a first resonator; a second resonator; said first resonator being non-tunable; said second resonator being a tunable ferroelectric resonator; wherein the first resonator and the second resonator work as a single resonator; a ground plane for separating said first and second resonators, the ground plane being common for said first and second resonators; coupling means for providing coupling between said first resonator and said second resonator; and wherein for tuning of the resonator apparatus, a biasing voltage is applied to the second resonator. 23. A tunable resonator apparatus according to claim 22, wherein the first resonator and the second resonator comprise respective parallel plate resonators, that the common ground plane is formed by a second electrode plate of the first resonator and of a second electrode plate of the second resonator, and wherein the coupling means comprises a slot or an aperture in the common ground plane. 24. A tunable resonator apparatus according to claim 23, wherein the first resonator comprises a substrate comprised of LaAlO3, MgO, NdGaO3, Al2O3, or sapphire, wherein the second resonator comprises a substrate comprised of SrTiO3, or KTaO3, wherein the second electrode plate of the first resonator and the second electrode plate of the second resonator comprise normal metal, or high temperature superconductors. 25. A method of tuning a resonator apparatus, comprising: providing a first, non-tunable, resonator, providing a second tunable resonator, separating the first and second resonators by a common ground plane, providing coupling means in said common ground plane such that the first and second resonators becomes a coupled resonator apparatus, thereby allowing transfer of electromagnetic energy between the first and second resonators, applying a biasing/tuning voltage to said second resonator for changing the resonating frequency, and the loss tangent of the second resonator, and the transfer of electromagnetic energy to the first resonator, optimizing application of the biasing voltage such that influence of the increased loss tangent in the first resonator, on the coupled resonator apparatus, will be compensated for, by an increased transfer of electromagnetic energy to the first resonator. 26. The method of claim 25, wherein the first resonator and the second resonator comprise disk or parallel plate resonators, wherein the common ground plane is formed by a second electrode plate of the first resonator and of a second electrode of the second resonator, and wherein the coupling means comprises a slot or an aperture in the common ground plane. 27. The method of claim 25, wherein the first resonator comprises a substrate comprised of LaAlO3, MgO, NdGaO3, Al2O3, or sapphire, wherein the second resonator comprises a substrate comprised of SrTiO3, or KTaO3, wherein electrode plates of the first and second resonators comprise normal metal, or high temperature superconductors. 28. The method of claim 27, further comprising: coupling two or more resonator apparatuses such that a filter is provided, optimizing the coupling between the respective first and second resonator such that the increasing loss factor produced by an increased biasing voltage is reduced. 29. A tunable resonating arrangement according to claim 22, wherein the resonator apparatus provides a two pole filter.
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