CA2527911A1 - Superconducting quantum antenna - Google Patents

Superconducting quantum antenna Download PDF

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Publication number
CA2527911A1
CA2527911A1 CA002527911A CA2527911A CA2527911A1 CA 2527911 A1 CA2527911 A1 CA 2527911A1 CA 002527911 A CA002527911 A CA 002527911A CA 2527911 A CA2527911 A CA 2527911A CA 2527911 A1 CA2527911 A1 CA 2527911A1
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CA
Canada
Prior art keywords
primary antenna
interference filter
quantum interference
antenna structure
superconducting
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Granted
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CA002527911A
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French (fr)
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CA2527911C (en
Inventor
Joerg Oppenlaender
Christoph Haeussler
Nils Schopohl
Alexander Friesch
Joerg Tomes
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QEST Quantenelektronische Systeme GmbH
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Individual
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Publication of CA2527911A1 publication Critical patent/CA2527911A1/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/02Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/035Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
    • G01R33/0354SQUIDS
    • G01R33/0358SQUIDS coupling the flux to the SQUID
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/364Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor

Abstract

An antenna for electromagnetic waves is proposed that comprises a quantum interference filter (51), at least one low-temperature transistor (51) and primary antenna structures (54, 55, 59, 60), means (51, 52, 53a, 53b) for deriving an electromagnetic wave from the circuit, cooling elements and insulating means (57), wherein the superconducting quantum interference filter (51) and the transistor (52) act as active components, the primary antenna structure is connected up to at least one of the active components (51, 52) in such a way that upon incidence of an electromagnetic wave on the primary antenna structure (54, 55, 59, 60) there is present at the output of the at least one active component (51, 52) a conducted electromagnetic wave, and wherein at least one part of the circuit and at least one part of the primary antenna structure (54, 55, 59, 60) are thermally insulated, the thermal insulation (57) is frequency transparent to electromagnetic waves, and the cooling elements are designed to cool down at least one part of the circuit below the transition temperature of at least one of the superconducting materials.

Claims (33)

1. An antenna for electromagnetic waves composed of at least one superconducting quantum interference filter (51) (SQIF) that comprises closed superconducting cells which form a current loop and in each case include a plurality of, preferably two, Josephson junctions, wherein at least three of these cells are connected in a superconducting and/or non-superconducting fashion, the junctions of the at least three cells can be energized in such a way that a time-variant voltage drops in each case across at least two junctions of a cell, the time average of which voltage does not vanish, the at least three cells are configured differently geometrically in such a way that the magnetic fluxes enclosed by the cells in the case of an existing magnetic field differ from one another in such a way that the frequency spectrum of the voltage response function has no significant .PHI.0-periodic component with reference to the magnetic flux, or in that if a discrete frequency spectrum exists, the contribution of the .PHI.0-periodic component of the discrete frequency spectrum is not dominant compared to the non-~~-periodic components of the discrete frequency spectrum, of primary antenna structures made from normally conducting and/or superconducting materials in which an antenna current is induced upon incidence of an electromagnetic wave, of means for generating an adjustable magnetic field for controlling the superconducting quantum interference filter, of means for supplying the superconducting quantum interference filter with an operating current and of means (51, 52, 53a, 53b) that are designed to be able to lead off as electromagnetic wave a voltage oscillation dropping across the superconducting quantum interference filter (51), wherein the primary antenna structure is electrically connected to the superconducting quantum interference filter (51) and/or is magnetically coupled thereto, and the superconducting quantum interference filter (51) is supplied with an operating current in such a way, and the magnetic field for controlling the superconducting quantum interference filter (51) can be adjusted in such a way that the antenna current flowing in the antenna structure upon incidence of electromagnetic waves excites the superconducting quantum interference filter (51) such that an electric voltage dependent on the antenna current drops across the superconducting quantum interference filter (51).
2. The apparatus as claimed in claim 1, characterized in that the magnetic control field of the superconducting quantum interference filter is adjusted in such a way that a time-variant antenna current excites the superconducting quantum interference filter in such a way that the frequency of the antenna current is included in the frequency spectrum of the electrical voltage dropping across the superconducting quantum interference filter.
3. An antenna for electromagnetic waves of high frequency, composed of a normally conducting and/or superconducting electrical circuit of at least one superconducting quantum interference filter (51) that comprises closed superconducting cells which form a current loop and in each case include a plurality of, preferably two, Josephson junctions, wherein at least three of these cells are connected in a superconducting and/or non-superconducting fashion, the junctions of the at least three cells can be energized in such a way that a time-variant voltage drops in each case across at least two junctions of a cell, the time average of which voltage does not vanish, the at least three cells are configured differently geometrically in such a way that the magnetic fluxes enclosed by the cells in the case of an existing magnetic field differ from one another in such a way that the frequency spectrum of the voltage response function has no significant .PHI.0-periodic component with reference to the magnetic flux, or in that if a discrete frequency spectrum exists, the contribution of the .PHI.0-periodic component of the discrete frequency spectrum is not dominant compared to the non-.PHI.0-periodic components of the discrete frequency spectrum, of at least one low-temperature transistor (52) and primary antenna structures, of means for supplying the circuit with electric energy, of means for supplying the circuit with a control current and/or a control voltage, of means (51, 52, 53a, 53b) for leading off an electromagnetic wave from the circuit, of cooling elements that can extract heat from at least a part of the circuit during operation, and of insulating means (57) for thermally insulating at least a part of the circuit and of the primary antenna structure, wherein the superconducting quantum interference filter (51) and the transistor (52) act as active components, an antenna current is induced in the primary antenna structures upon incidence of an electromagnetic wave, the primary antenna structure is connected up to at least one of the active components (51, 52) in such a way that upon incidence of an electromagnetic wave on the primary antenna structure there is present at the output of the at least one active component (51, 52) a conducted electromagnetic wave that can be passed on to a consumer, and wherein at least one part of the circuit and at least one part of the primary antenna structure are thermally insulated, the thermal insulation (57) of the part of the primary antenna structure is transparent to electromagnetic waves of high frequency at at least one location, and the cooling elements can withdraw heat from the at least one part of the circuit and the at least one part of the primary antenna structure and are designed to cool down at least one part of the circuit below the transition temperature of at least one of the superconducting materials.
4. An antenna for electromagnetic waves of high frequency, composed of a normally conducting and/or superconducting electrical circuit of at least one low-temperature transistor and primary antenna structures, of means for supplying the circuit with electric energy, of means for supplying the circuit with a control current and/or a control voltage, of means for leading off an electromagnetic wave from the circuit, of cooling elements that can extract heat from at least a part of the circuit during operation, and of insulating means for thermally insulating at least a part of the circuit and of the primary antenna structure, wherein the transistor acts as an active component, an antenna current is induced in the primary antenna structures upon incidence of an electromagnetic wave, the primary antenna structure is connected up to the active component in such a way that upon incidence of an electromagnetic wave on the primary antenna structure there is present at the output of the at least one active component a conducted electromagnetic wave that can be passed on to a consumer, and wherein at least one part of the circuit and at least one part of the primary antenna structure are thermally insulated, the thermal insulation of the part of the primary antenna structure is transparent to electromagnetic waves of high frequency at at least one location, and the cooling elements can withdraw heat from the at least one part of the circuit and the at least one part of the primary antenna structure and are designed to cool down at least one part of the circuit below a comparatively low temperature of, for example, 150 kelvins.
5. The apparatus as claimed in claim 3 or 4, characterized in that the thermal insulation is designed as a vacuum chamber.
6. The apparatus as claimed in one of claims 3 to 5, characterized in that the thermal insulation is part of the primary antenna structure.
7. The apparatus as claimed in one of claims 3 to 6, characterized in that the entire circuit is thermally insulated, and the, for example active and/or passive, cooling elements can extract heat from the entire circuit.
8. The apparatus as claimed in one of claims 3 to 7, characterized in that a part of the primary antenna structure is composed of a hollow conductor termination into which there projects at least one elongated antenna element, for example an antenna pin, that is electrically insulated from the hollow conductor, and the at least one antenna element is electrically connected to the input of at least one active component, and the circuit includes a plurality of active components that are connected in series, and the hollow conductor termination and the part of the circuit that includes the active components are located in an evacuatable vessel, and heat can be extracted from the hollow conductor termination and the part of the circuit that includes the active components.
9. The apparatus as claimed in claim 8, characterized in that projecting into the hollow conductor termination are two antenna elements that are fitted offset from one another and that in each case are individually electrically connected to the input of an active component such that two independent polarizations can be led off from the hollow conductor termination.
10. The apparatus as claimed in one of the preceding claims, characterized in that a part of the primary antenna structures is composed of at least one of the following structures:
- an array of normally conducting and/or superconducting aperture antennas, - an array of normally conducting and/or superconducting patch antennas, - one or more electromagnetic lenses, - one or more horn antennas, or - one or more parabolic antennas, whose output signal is assembled via a hollow conductor structure and/or a normally conducting and/or superconducting lead structure and is coupled to at least one of the active components.
11. The apparatus as claimed in one of the preceding claims, characterized in that the electrodes of the superconducting quantum interference filter itself are designed as the primary antenna structures.
12. The apparatus as claimed in one of the preceding claims, characterized in that the superconducting quantum interference filter is equipped with an impedance transformer that transforms the impedance of the superconducting quantum interference filter to the impedance of a connected waveguide or a connected consumer.
13. The apparatus as claimed in one of the preceding claims, characterized in that the superconducting quantum interference filter is operated in such a way that the part of the electric voltage dropping across the superconducting quantum interference filter which oscillates rapidly with the Josephson relation locks onto the carrier frequency of the incident electromagnetic wave such that the voltage dropping across the superconducting quantum interference filter includes the frequency-modulated signal of the incident electromagnetic wave.
14. The apparatus as claimed in one of the preceding claims, characterized in that the superconducting quantum interference filter and the primary antenna structure are applied to a common carrier.
15. The apparatus as claimed in one of the preceding claims, characterized in that the superconducting quantum interference filter and the primary antenna structure are applied to separate carriers.
16. The apparatus as claimed in one of the preceding claims, characterized in that the superconducting quantum interference filter is applied to one carrier, and the primary antenna structure is applied to another carrier, and the two carriers lie above an other.
17. The apparatus as claimed in one of the preceding claims, characterized in that the superconducting quantum interference filter is constructed from grain boundary Josephson junctions, and the electrodes are composed of high-temperature superconductors.
18. The apparatus as claimed in one of the preceding claims, characterized in that the primary antenna structure is composed of high-temperature superconductors.
19. The apparatus as claimed in one of the preceding claims, characterized in that the antenna is operated in an active cooler.
20. The apparatus as claimed in claim 19, characterized in that the antenna is located on a chip that is fitted on the cooling finger of the active cooler, and in that the antenna signal is derived from said antenna chip with the aid of a poorly thermally conducting waveguide.
21. The apparatus as claimed in claim 20, characterized in that the operating current of the superconducting quantum interference filter is fed and led off by the waveguide.
22. The apparatus as claimed in one of the preceding claims, characterized in that the primary antenna structure is composed of one or an array of antenna rods or other electric conductors whose length or dimensions is/are in the range of half the wavelength of the incident electromagnetic wave.
23. The apparatus as claimed in one of the preceding claims, characterized in that the primary antenna structure is composed of one or an array of closed or open loop antennas.
24. The apparatus as claimed in one of the preceding claims, characterized in that the primary antenna structure is composed of one or more electrically small antennas.
25. The apparatus as claimed in one of the preceding claims, characterized in that the primary antenna structure is also or exclusively composed of dielectric materials.
26. The apparatus as claimed in one of the preceding claims, characterized in that the antenna is operated in a resonant cavity that has at a suitable location an opening for the electromagnetic wave incident indirectly or directly.
27. The apparatus as claimed in one of the preceding claims, characterized in that the primary antenna structure is equipped with additional filter elements in such a way that one or more frequency bands are selected.
28. The apparatus as claimed in one of the preceding claims, characterized in that the antenna includes additional electronic components, in particular electric resistors, capacitors, coils, filter components, transistors or electronic amplifiers.
29. The apparatus as claimed in one of the preceding claims, characterized in that the antenna is applied to a substrate by means of microstripline technology such that an electrically conducting base plate forms the counter-electrode.
30. The apparatus as claimed in one of the preceding claims, characterized in that the antenna is equipped with an electronic feedback control with the aid of which the output signal of the superconducting quantum interference filter is fed back to the latter.
31. The apparatus as claimed in one of the preceding claims, characterized in that the superconducting quantum interference filter impresses a time-variant voltage on the primary antenna structure such that a time-variant antenna current flows in the primary antenna structure and the primary antenna structure emits an electromagnetic wave.
32. An antenna field having two or more antennas as claimed in one of the preceding claims.
33. The antenna field as claimed in claim 32, characterized in that means are provided with the aid of which the signals of the antennas arranged in the antenna array can be superposed in a phase-sensitive fashion to form an aggregate signal.
CA2527911A 2003-06-13 2004-06-14 Superconducting quantum antenna Active CA2527911C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10327061 2003-06-13
DE10327061.2 2003-06-13
PCT/DE2004/001209 WO2004114463A1 (en) 2003-06-13 2004-06-14 Superconductive quantum antenna

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CA2527911A1 true CA2527911A1 (en) 2004-12-29
CA2527911C CA2527911C (en) 2010-09-14

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US (1) US7369093B2 (en)
EP (1) EP1634351B1 (en)
JP (1) JP4303286B2 (en)
AT (1) ATE393970T1 (en)
CA (1) CA2527911C (en)
DE (2) DE102004028432A1 (en)
DK (1) DK1634351T3 (en)
ES (1) ES2305780T3 (en)
PT (1) PT1634351E (en)
WO (1) WO2004114463A1 (en)

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Also Published As

Publication number Publication date
DE102004028432A1 (en) 2004-12-30
DK1634351T3 (en) 2008-08-18
JP4303286B2 (en) 2009-07-29
EP1634351B1 (en) 2008-04-30
ES2305780T3 (en) 2008-11-01
PT1634351E (en) 2008-08-08
US20060145694A1 (en) 2006-07-06
JP2006527548A (en) 2006-11-30
EP1634351A1 (en) 2006-03-15
ATE393970T1 (en) 2008-05-15
CA2527911C (en) 2010-09-14
WO2004114463A1 (en) 2004-12-29
DE502004007007D1 (en) 2008-06-12
US7369093B2 (en) 2008-05-06

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