Superconducting arrangement with non-orthogonal degenerate resonator modes

• US 6,114,931 A
• Filed: 06/18/1998
• Issued: 09/05/2000
• Est. Priority Date: 12/19/1995
• Status: Expired due to Fees

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Gevorgian, Spartak, Wikborg, Erland
• Primary Examiner(s): Bettendorf, Justin P.
• Application Number:
  US09/099,273
• Time in Patent Office: 810 Days
• Field of Search: 333/995, 333/205, 333/219, 333/235, 333/134, 505/210, 505/700, 505/701, 505/866
• US Class Current: 333/99.00S
• CPC Class Codes: H01P 1/213 combining or separating two or more different frequencies H01P1/215 takes precedence
• CPC Class Codes: H01P 7/105 Multimode resonators
• CPC Class Codes: Y10S 505/701 Coated or thin film device, i.e. active or passive

Abstract

Superconducting multiplexing/demultiplexing arrangements include a number of signal input devices and a number of signal output devices. A number of resonators provides a number of filters. Each filter represents a channel. The resonator(s) operate(s) devices at lest in dual mode, and tuning devices are provided so that at least some of the resonators is/are tuneable. A method is provided of multiplexing signals incoming to a multiplexing arrangement with a number of resonators, each of the resonators having a number of input ports which are so arranged that a number of mulitpole filters are created. Input signals having different frequencies are supplied to the different input ports of the resonators, each of which is operated in three modes. Coupling devices are arranged which at least comprise the angle between the input ports and a symmetry plane. The angles are non-perpendicularly azimuth. Tuning devices are further provided for tuning the resonant frequencies of the degenerate modes, and the coupling angles and tuning devices are controlled so that for a number of input signals, only input signal is transmitted to the output devices.

Claims

1. Superconducting switching arrangement comprising a number of signal input means, a number of signal output means, a number of resonators providing a number of filters, each filter representing a channel, the resonators at least operating in dual mode, and tuning means, wherein asymmetries are produced in the resonators to provide an electric field redistribution so that degenerate resonator modes are created, and the tuning means tune at least some of the resonators, further comprising first coupling means to provide mutual coupling between degenerate modes in the resonators, wherein an input means and an output means are arranged such that at lest one angle is formed for which the degenerate modes become coupled, said angle forming first coupling means, and wherein the coupling angle is an azimuthal angle between the signal input and a resonator symmetry axis, and the degenerate modes are non-orthogonal in relation to each other.

2. Arrangement according to claim 1, further comprising second coupling means for controlling the strength of the coupling between the degenerate modes or for controlling resonant frequencies of the coupled degenerate modes for a given coupling angle, wherein the resonant frequencies are determined by dielectric substrate and plates.

3. Arrangement according to claim 2, wherein the second coupling means comprise a number of notches arranged on the resonators.

4. Arrangement according to claim 1, wherein lowest order of degenerate (TM) modes are coupled.

5. Arrangement according to claim 1, wherein some of the resonators are electrically tunable.

6. Arrangement according to claim 1, wherein a number of the resonators are optically or mechanically tunable or temperature tuning is applied.

7. Arrangement according to claim 1, wherein a number of the resonators are triple mode resonators.

8. Arrangement according to claim 7, wherein some of the resonators comprise three azimuthal degenerate modes.

9. Arrangement according to claim 1, wherein the number of resonators needed to provide a given number of filters does not exceed the number of filters.

10. Arrangement according to claim 1, wherein the arrangement comprises a switch which comprises one resonator, wherein an input port forms an azimuth coupling angle with a symmetry axis for which coupling is provided between degenerate modes so that, depending on biasing conditions, an input signal is transmitted to an output port or prevented from being transmitted to the output port.

11. Arrangement according to claim 1, said arrangement forming a two-channel multiplexer comprising a resonator, wherein each channel comprises a two-pole filter, and coupling is given by a first and second azimuthal coupling angles between a resonator symmetry axis and first and second signal input means, respectively, said first and second signal input means having a common signal output means.

12. Arrangement according to claim 11, wherein for a first tuning or biasing condition, only the first input signal is output via the signal output means, whereas for a second biasing condition, only the second input signal is transmitted to the signal output means.

13. Arrangement according to claim 1, said arrangement forming a four-channel multiplexer with four input ports, a common output port and three tunable resonators.

14. Arrangement according to claim 13, wherein said arrangement is a branching filter multiplexer, and each branching filter multiplexer comprises a four-pole filter.

15. Arrangement according to claim 13, wherein a first resonator and a second resonator comprise two four-pole tunable branching filters, and a third resonator forms two further four-pole tunable filters with the first resonator.

16. Arrangement according to claim 13, wherein first and second coupling means and biasing conditions are such that only one of four input signals is output at a time.

17. Arrangement according to claim 1, said arrangement forming an eight-channel multiplexer comprising seven resonators, each with six-pole tunable filters in each branch channel.

18. Arrangement according to claim 1, said arrangement forming a multichannel multiplexer having more than eight channels.

19. Arrangement according to claim 1, wherein the resonators are made from a non-linear bulk material with a high dielectric constant at least partly covered by high temperature superconducting (HTS) films.

20. Arrangement according claim 1, wherein the resonators are parallel plate resonators.

21. Arrangement according to claim 1, wherein the resonators are disk, ring, or rectangular resonators or resonators of an arbitrary shape.

22. Arrangement according to claim 1, wherein the filters are bandpass filters.

23. Tuneable filter for electromagnetic signals comprising a number of input ports, a number of output ports, a number of resonators, and tuning means, wherein asymmetries are produced in the resonator(s) to provide a current or an electric field redistribution so that degenerate resonator modes are created, each resonator being a multimode resonator, and the tuning means tune resonant frequencies of the degenerate modes, wherein each resonator comprises at least tow azimuthally degenerate modes which are not perpendicular to each other, and coupling between the degenerate modes is given by an azimuthal angle between the respective input port and a resonator symmetry plane, and the degenerate modes are non-orthogonal in relation to each other.

24. Tuneable filter according to claim 23, wherein three azimuthal degenerate modes are used.

25. Tuneable filter according to claim 23, wherein the tuning means comprise electrical connections for the application of a biasing voltage.

26. Method for multiplexing electromagnetic signals incoming to a multiplexing arrangement comprising a number of resonators, each with a number of input ports so arranged that a number of mulitpole filters are created, the method comprising the steps of:

supplying a number of input signals having different frequencies to the different input ports of resonators, each of which comprises at least two input ports,

operating each resonator in three modes,

arranging coupling means for the resonator, wherein said coupling means comprises the introduction of asymmetries to provide a current or an electric field redistribution so that degenerate modes are formed, and the degenerate modes are non-orthogonal in relation to each other,

providing tuning means for tuning resonant frequencies of the degenerate modes, and

controlling coupling angles and tuning means in such a way that for a number of input signals, only one input signal can be transmitted to output means, wherein the coupling means comprises angles between the input ports and a symmetry axis, which angles are nonperpendicularly azimuth.

27. Method according to claim 26, wherein the tuning is electrical.