EP0901692A1 - Procede pour syntoniser des filtres supraconducteurs planaires - Google Patents

Procede pour syntoniser des filtres supraconducteurs planaires

Info

Publication number
EP0901692A1
EP0901692A1 EP97922897A EP97922897A EP0901692A1 EP 0901692 A1 EP0901692 A1 EP 0901692A1 EP 97922897 A EP97922897 A EP 97922897A EP 97922897 A EP97922897 A EP 97922897A EP 0901692 A1 EP0901692 A1 EP 0901692A1
Authority
EP
European Patent Office
Prior art keywords
filter
housing
cover
resonators
filters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97922897A
Other languages
German (de)
English (en)
Other versions
EP0901692B1 (fr
Inventor
Werner GRÜENWALD
Christian Neumann
Matthias Klauda
Claus Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0901692A1 publication Critical patent/EP0901692A1/fr
Application granted granted Critical
Publication of EP0901692B1 publication Critical patent/EP0901692B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20363—Linear resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2135—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using strip line filters

Definitions

  • the invention is based on a method for tuning planar superconducting filters according to the type of the independent claim.
  • planar filter to be tuned consists of a substrate with a superconductor layer on the underside, which serves as a ground line.
  • a micro structure also made of superconducting material, which has a conductor for capacitive coupling of the
  • High-frequency signal, a resonator, and a line for capacitive coupling of the signal comprises.
  • the resonator is an approximately circular planar microstructure, the lateral dimensions of which determine its resonance properties.
  • the effective dielectric function of the surroundings of the resonator determines its resonance properties.
  • the imaginary part of the effective dielectric function causes the filter losses, its real part influences the position of the resonance frequency.
  • the filter is located in a housing, in the lid of which at least one with a thread provided through hole is provided. This rotates a screw such that the screw head is outside the housing and the threaded end of the screw is immersed in the electric field of the microwave or millimeter wave propagating in the filter.
  • the attachment of a superconducting plate with approximately the same diameter as the thread of the screw on the screw tip is proposed.
  • a screw located above a resonator influences its resonance frequency in a first approximation.
  • a screw that dips into the space between two adjacent resonators primarily affects the coupling between these two resonators.
  • the tuning method proposed in EP 05 22 515 AI for a single resonator is suitable for the production of filters with very low losses, but the tuning of more complex filters with a larger number of resonators is extremely time-consuming due to the large number of degrees of freedom. This is known to the person skilled in the art.
  • WO 94/28592 in particular FIG. 12, shows a planar bandpass filter
  • High-temperature superconductor base known in microstrip technology.
  • a superconductor layer on the underside of a carrier substrate, which serves as a ground line.
  • a microstructure also made of superconducting material, which comprises a conductor for the capacitive coupling of the high-frequency signal, several resonators, and a line for the capacitive coupling out of the signal.
  • the resonator is a strip conductor of approximately rectangular shape, the lateral dimensions of which resonate determine.
  • the carrier substrate consists of a layer structure which contains at least one ferroelectric or antiferroelectric layer.
  • this ferroelectric or antiferroelectric layer By applying a voltage to this ferroelectric or antiferroelectric layer, its dielectric function can be changed significantly, and thus also the dielectric function of the environment of the planar filter.
  • the resonance characteristic of the filter can thus also be changed, but only integrally, that is to say in an approximately identical manner for all
  • the method according to the invention with the characterizing features of the independent claim has the advantage that the coordination is significantly less complex and still allows to produce filters with low losses. Another advantage is that, due to the shorter time required for the tuning, the manufacturing costs of a fully tuned filter turn out to be significantly lower, since the time required for tuning represents a significant proportion of the manufacturing costs.
  • FIG. 1 shows the perspective view of a filter in a cut-open housing which is provided with a height-adjustable cover
  • FIG. 2 shows a transmission curve of a filter according to the invention
  • FIG. 3 shows a filter installed in a housing, which has an inner cover that can be lowered from the cover,
  • FIG. 4 shows a filter which is built into a housing and which has an inner cover which can be lowered relative to the cover by means of piezotranslators,
  • Figure 5 shows a filter installed in a housing which is provided with plates on the inside of the lid and
  • Figure 6 is a filter bank, on the housing cover a stepped plate is attached.
  • Figure 1 shows a planar filter
  • the planar filter consists of a dielectric substrate (1), which has a superconductor, preferably a high temperature superconductor is coated. This layer forms the ground line (2).
  • This planar superconducting filter is installed in a housing consisting of a base plate (10), a housing wall (11) and a cover (12).
  • the cover (12) is fastened to the housing wall (11) by means of two screws (13, 14).
  • the terms housing wall or wall are also used as a collective term for cover, base plate and wall.
  • the cover (12) perpendicular to the line (30), there is a coupling screw (20), the threaded end of which protrudes from the inside of the housing.
  • the line (30) runs between the resonators (5,6); Sectional drawings in the following figures show sections along a plane which contains this line and runs perpendicular to the surface of the substrate (1).
  • the planar filter shown in FIG. 1 is a bandpass filter, in which only microwaves or millimeter waves (hereinafter also referred to collectively as high-frequency waves) with a frequency that corresponds to the natural frequency of the resonators (4, 5, 6) between the input conductors (3) and output conductor (7) are transmitted.
  • Suitable filtering can also be used to implement other types of filters, in particular band-stop filters, low-pass filters or high-pass filters, to which the method according to the invention can also be applied.
  • the cover (12) is by means of the screws (13,14) attached to the housing wall (11).
  • these screws (13, 14) are used to adjust the height of the cover. This is done by loosening the screws (13, 14) and holding up the cover (12) by a lock nut (15) placed on the screws (13, 14).
  • the lock nut placed on the screw (14) is covered by the cover (12) in FIG. 1.
  • the coupling between the individual resonators determines the spectral fine structure within the transmission band.
  • An example of this very weak spectral fine structure is marked with an arrow in FIG.
  • This coupling is influenced by the coupling screw (20).
  • the threaded end of the coupling screw is immersed both in the electrical field of the resonator (5) and in the electrical field of the resonator (6) and thus serves as a double capacitive coupling between the resonators (5) and (6).
  • a more developed coupling, which in the embodiment chosen here is a further screwed in
  • FIG. 3 shows a section through a filter in a housing along a section line (30) (see FIG. 1). Components that are the same or function the same as in FIG. 1 have been provided with the same reference number.
  • a superconducting layer (2) which functions as a ground conductor.
  • the resonators of the filter lie outside the section plane and are therefore not visible in FIG. 3.
  • the filter is installed in a housing with a base plate (10) and housing wall (11), the structural design of which ensures that the filter element is securely fixed.
  • the housing also has a cover (12) which is provided with holes (50, 52, 53).
  • the inner cover (40) Inside the housing, parallel to the cover (12), is the inner cover (40), which has a bore (51) aligned with the bore (50), which is provided with a thread.
  • two threaded bolts (41, 42) are attached to the cover (40), such that they protrude outwards through the holes (52, 53) in the cover (12), and a seal (45) which seals the inner cover (40). seals against the housing wall.
  • Nuts (44.45) are screwed onto the threaded bolt (41.42).
  • Springs (16) are glued to the outside of the cover in such a way that their resilient end touches the end of the threaded bolts (41, 42) and exerts an axial force on them in the direction of the filter.
  • Securing lugs (15) are provided on the housing walls (11).
  • the nuts (44,45) located on the threaded bolts (41,42) serve together with those on the threaded bolts pressing springs (16) for setting and fixing a distance between the inner cover (40) and the cover (12).
  • the securing lugs (15) protect the superconducting microstructure on the top of the substrate against damage by an erroneously detached inner cover (40).
  • the coupling screw (20) makes it possible to influence the coupling between the individual resonators, and thus the spectral fine structure within the transmission band.
  • the seal (45) and the fact that the hole (51) is threaded results in a relatively tight housing.
  • FIG. 4 An electrically controllable method of lowering the inner cover in order to tune the filter is shown in the further exemplary embodiment in FIG. 4.
  • a planar filter applied to a dielectric substrate (1), of which only the superconducting ground conductor (2) is visible in the sectional drawing shown, in a housing which consists of a base plate (10), a housing wall (11) and a Cover (12) exists.
  • the filter and housing are cut along the same cutting line as the device in Fig. 3.
  • the same or functionally identical components as in the previous figures have been given the same reference numerals.
  • two piezotranslators (60) are attached, which in turn are connected to the inside cover (40).
  • Inner cover (40) and cover (12) have two coaxial bores (51, 50), of which the bore (51) is threaded and the bore (50) is provided with an electrically insulating guide bush (61).
  • a coupling screw (20) is located in the bore (51).
  • the raising and lowering of the inner cover which influences the filter characteristics in the same way as in the previous example, is done in this example by applying a voltage to the piezo transformer (s) (60).
  • the piezo transformer (s) 60
  • Coupling screw (20) attached to the inner cover and not to the outer cover.
  • An obvious solution for applying a voltage to the piezo translator (60) is therefore to apply a voltage between the cover (12) and coupling screw (20).
  • One possible application of this exemplary embodiment of the invention disclosed here is to combine the electrically controlled tuning of the filter with a control and regulating circuit in order to compensate for drift phenomena, for example.
  • FIG. 5 shows a further preferred exemplary embodiment.
  • the section is carried out along the section line shown in FIG. 1; same or functionally identical components as in the previous figures are provided with the same reference numerals.
  • a filter consisting of a ground conductor (2), applied to a dielectric substrate (1), and a resonator (not visible in FIG. 5) in a housing, consisting of a base plate (10), housing wall (11) and cover (12 ) , built-in.
  • a coupling screw (20) is screwed into a threaded hole (50).
  • a conductive plate (70) is attached to the inside of the cover (12).
  • the spectral position of the filter band is selected by selecting a plate (70) with the appropriate thickness and attaching it to the inside of the cover (12). Again, the coupling screw (20) can be used to influence the spectral
  • Fine structure of the filter belt can be used.
  • the change in the spectral position of the transmission band is no longer possible after the assembly of the housing without opening the housing again, however, a pretuning can be made in this way with very simple means, which then only with the aid of the coupling screws (20) Detail needs to be corrected.
  • FIG. 6 shows the cross section through a filter bank in which there are four identical planar filters (80), produced with identical masks on identical ones
  • the housing consists of a base plate (10), a housing wall (11) and a cover (12).
  • a step plate (72) is attached to the inside of the cover (12). Due to the different distances between the planar filters (80) and the surface of the step plate (72) facing them, the spectral position of the transmission frequencies of the channels realized by the individual planar filters is slightly detuned from one another without changing the spectral fine structure. In this way, a multi-channel filter bank can be built with very simple means and bypassing the production of several masks. If necessary and / or desired, additional screws for fine tuning can also be provided in this implementation example.
  • the housing cover was used to represent other housing components which are sufficiently close to the planar filter so that they interact with the electrical field of the high-frequency wave propagating through the filter structure.
  • Possible modifications of the invention consist in making one or more side walls and / or the floor slidable in the sense mentioned above. It also seems conceivable to implement the coupling screws (20) and the sliding cover on different surfaces, for example to attach the coupling screws (20) to a side wall coaxially to the line (30) shown in FIG. 1, and which are parallel to the substrate (1) running housing surface facing (that is, the surface with the resonators) as a sliding cover in the sense mentioned above.
  • coupling screws (20), which protrude into the half-space between two resonators, were used if, in addition to the displacement of the transmission band, the fine structure of the transmission band is changed by the displaceable housing wall should. It is also conceivable, in addition to the lowerable housing cover, to provide one or more tuning screws in the field space above a single resonator. It is then possible to move the entire transmission band integrally by moving the housing wall, and in addition, for example by moving the resonance of a single resonator, to design the filter to be narrowband or broadband.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

L'invention concerne un procédé permettant de syntoniser des filtres supraconducteurs planaires. A cet effet, il est prévu un couvercle de boîtier réglable en hauteur qui permet d'ajuster la fréquence centrale du filtre de bande. Les filtres peuvent ainsi être syntonisés de manière simplifiée. L'invention concerne également la réalisation d'un banc de filtres pour applications de multiplexage, fondé sur ce procédé.
EP97922897A 1996-05-28 1997-05-09 Procede pour syntoniser des filtres supraconducteurs planaires Expired - Lifetime EP0901692B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19621335A DE19621335A1 (de) 1996-05-28 1996-05-28 Verfahren zur Abstimmung von planaren supraleitenden Filtern
DE19621335 1996-05-28
PCT/DE1997/000934 WO1997045888A1 (fr) 1996-05-28 1997-05-09 Procede pour syntoniser des filtres supraconducteurs planaires

Publications (2)

Publication Number Publication Date
EP0901692A1 true EP0901692A1 (fr) 1999-03-17
EP0901692B1 EP0901692B1 (fr) 2001-10-17

Family

ID=7795469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97922897A Expired - Lifetime EP0901692B1 (fr) 1996-05-28 1997-05-09 Procede pour syntoniser des filtres supraconducteurs planaires

Country Status (3)

Country Link
EP (1) EP0901692B1 (fr)
DE (2) DE19621335A1 (fr)
WO (1) WO1997045888A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003338701A (ja) * 2002-05-20 2003-11-28 Seiko Epson Corp 高周波スイッチの製造方法及び高周波スイッチ並びに電子機器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281302A (en) * 1979-12-27 1981-07-28 Communications Satellite Corporation Quasi-elliptic function microstrip interdigital filter
JPS6328103A (ja) * 1986-07-22 1988-02-05 Murata Mfg Co Ltd ストリツプラインフイルタ
FR2605146B1 (fr) * 1986-09-25 1988-12-02 Alcatel Thomson Faisceaux Filtre a bande ajustable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9745888A1 *

Also Published As

Publication number Publication date
DE59704975D1 (de) 2001-11-22
DE19621335A1 (de) 1997-12-04
WO1997045888A1 (fr) 1997-12-04
EP0901692B1 (fr) 2001-10-17

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