CN100505415C - A planar high-temperature superconducting microstrip resonator with low electromagnetic radiation - Google Patents
A planar high-temperature superconducting microstrip resonator with low electromagnetic radiation Download PDFInfo
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Abstract
本发明涉及一种平面高温超导微带谐振器，包括一条由上、下两层高温超导薄膜和位于两层高温超导薄膜间的人造单晶介质组成的微带线；其特征在于，所述微带线是一条连续完整的带状体，形成一个具有不封闭上环和不封闭下环的几何图形。本发明的优点是寄生耦合大大减弱，结构更加紧凑。当本发明提供的这种谐振器组合在一起时它们之间的耦合相对较弱，为了满足一定的耦合关系，它们必须靠得更近，这样就使整体结构更紧密；更重要的是当三个或三个以上的谐振器组合在一起形成滤波器时，远场较弱的耦合就意味着寄生耦合的影响大大减小，基于这一点利用本发明提供的谐振器设计并制作出高性能的窄带高温超导带通滤波器。
The invention relates to a planar high-temperature superconducting microstrip resonator, which comprises a microstrip line composed of upper and lower layers of high-temperature superconducting thin films and an artificial single crystal medium between the two layers of high-temperature superconducting thin films; it is characterized in that, The microstrip line is a continuous and complete strip, forming a geometric figure with an unclosed upper loop and an unclosed lower loop. The invention has the advantages that the parasitic coupling is greatly weakened and the structure is more compact. When the resonators provided by the present invention are combined together, the coupling between them is relatively weak. In order to satisfy a certain coupling relationship, they must be closer together, so that the overall structure is tighter; more importantly, when the three When three or more resonators are combined to form a filter, the far-field weaker coupling means that the influence of parasitic coupling is greatly reduced. Based on this, the resonator provided by the present invention is used to design and produce a high-performance Narrowband high temperature superconducting bandpass filter.
Description
Technical field
The invention belongs to the microwave engineering field, specifically, the present invention relates to a kind of plane high temperature super conductive microstrip resonator.
Background technology
In the microwave engineering, superconducting microstrip resonator can be formed the flat superconducting filter (a kind of passive device) of different rank, use is used for selecting the signal of certain frequency in various microwave devices (as radar, mobile telephone base station, microwave communication device, radio astronomical telescope etc.).At the front end of various microwave receiving systems, often use filter to suppress signal frequency not, the signal frequency that needs is passed through smoothly.High temperature superconduction wave filter is a kind of planar device made from high temperature superconducting materia, it by several planar resonator by certain regularly arranged forming.For the band pass filter of manufacturing with common metal, relative bandwidth just is being narrow band filter below 5% usually.The relative bandwidth of high temperature superconduction wave filter can be worth little a lot than this, also compares difficulty but relative bandwidth is less than 0.5%, and reason is the interference of parasitic couplings.Relevant theory is pointed out: the coupling coefficient between the resonator should satisfy following relationship
M in the formula (1)
IjIt is the coupling coefficient between i resonator and j the resonator; FBW is a relative bandwidth, defines its ratio for passband width and centre frequency; G is a normalization electric capacity; J is a characteristic admittance.This formula shows that coupling coefficient M depends on relative bandwidth, also depends on the character of resonator self.Obviously, be that normalization electric capacity g or characteristic admittance J should be closely related with the geometry of planar resonator self.The coupling of two adjacent resonators generations is called adjacent coupled in filter, and this coupling is necessary.But also have coupling between non-conterminous two resonators, this class coupling might cause adverse effect to Filter Design, and this harmful non-adjacent coupling is exactly parasitic couplings (parasitical coupling).When carrying out the design of broadband flat superconducting filter, the parasitic couplings between the resonant element can be ignored.But the situation of arrowband flat superconducting filter is then different fully, and parasitic couplings has often caused destructive interference, and this contradiction is particularly outstanding when bandwidth is near 0.5%, and desirable solution is seen at the end so far.
Traditional planar resonator mainly contains two kinds of versions, i.e. form of straight lines and hair fastener form.The research of flat superconducting filter has in recent years obtained significant progress, and corresponding planar resonator also develops and a series of other forms.General designer is many from the area that reduces resonator or change purpose such as coupled modes and go out to send the topological structure of determining resonant element, and for example the folding line planar superconducting microstrip resonator (168 pages in 2000 International Conference on Microwave and Millimeter Wave TechnologyProceedings collected works) of Birmingham, GBR university design is exactly an example.
Summary of the invention
The objective of the invention is to, in order to solve the structure of above-mentioned existing arrowband flat superconducting filter, the parasitic couplings that can produce is often to the interference of damaging property of device, near this contradiction distinct issues particularly when bandwidth is 0.5%; A kind of have high Q value, low electromagnetic, the plane high temperature super conductive microstrip resonator that nearest coupled is less are provided.
To achieve the above object of the invention, planar superconducting microstrip resonator provided by the invention comprises: a microstrip line of being made up of upper and lower two-layer high-temperature superconducting thin film and the artificial single crystal's medium between two-layer high-temperature superconducting thin film; It is characterized in that, described microstrip line is the shoestring of a continuous whole, form one and have the geometric figure structure of not sealing the ring and not sealing down the ring, described go up ring and encircle down have a horizontal common edge, this horizontal common edge is positioned at the stage casing of whole piece microstrip line.
The described mid point of going up ring and encircling with horizontal common edge down is that symmetrical centre is centrosymmetric.
Described have a geometric figure structure of not sealing the ring and not sealing down the ring, wherein an end of microstrip line from the opening part of last ring along under encircle profile and extend downwards, the other end of microstrip line extends upward along last ring profile from the opening part that encircles down.
Described have a geometric figure structure of not sealing the ring and not sealing down the ring, wherein an end of microstrip line from the opening part of last ring along under encircle profile and detour, the other end of microstrip line detours along last ring profile from the opening part that encircles down.
In above-mentioned technical scheme, described upper and lower ring is the not closed ring structure that is made of straight line (shown in Fig. 2,3a or Fig. 3 b), broken line or curve (shown in Fig. 3 b or Fig. 3 c).
The upper and lower ring of described resonator is made of straight line (shown in Fig. 2,3a).
The upper and lower ring of described resonator is made of straight line and curve (shown in Fig. 3 b, 3c).
Compared with prior art, the advantage of plane high temperature super conductive microstrip resonator provided by the invention is that electromagnetic radiation is less.This is because in resonator provided by the invention, and electric current mainly concentrates on the middle part of resonator, i.e. the horizontal line section part of resonator, and the magnetic field that their produce vertically distributes, and magnetic field radiation in the horizontal direction is very little.When two above resonator combinations formed filter, less radiation just meaned that they can lean on very closely in order to satisfy certain coupling relation, and the influence of parasitic couplings simultaneously reduces greatly.Can and make compact conformation with resonator design provided by the invention like this, the high-performance arrowband high-temperature superconductor band pass filter that volume is less.
Coupling coefficient between two resonators is measured by following method.Distance between coupled structure and the far field coupling frequency response curve thereof that Fig. 6 is made up of two resonators, two resonators is at least greater than resonator width, and the curve among the figure is the transmission characteristic of this coupled structure, and the frequency that its two peak values are corresponding respectively is f
1, f
2, correlation theory points out that the coupling coefficient k of this coupled structure can calculate with following formula (2),
Δ f=f in the formula
2-f
1, f
0It is the resonator centre frequency.Coupling coefficient k is directly proportional with Δ f as can be seen.
Description of drawings
Fig. 1 is the sectional view of microstrip line
Fig. 2 is a kind of geometry schematic diagram of plane high temperature super conductive microstrip resonator of the present invention
Fig. 3 a is the another kind of geometry schematic diagram of plane high temperature super conductive microstrip resonator of the present invention
Fig. 3 b is another geometry schematic diagram of plane high temperature super conductive microstrip resonator of the present invention
Fig. 3 c is another geometry schematic diagram of plane high temperature super conductive microstrip resonator of the present invention
Fig. 4 is according to given frequency f
0=1584MHz, crystal medium Al
2O
3DIELECTRIC CONSTANT
r=10.05, a high temperature super conductive microstrip resonator figure of design
Fig. 5 is the frequency response curve through the resonator that obtains after the Computer Simulation; Its result shows that the resonance frequency that computer provides is 1584.5MHz, no-load Q 〉=100000 under the simulated conditions of setting
Fig. 6 is coupled structure and the coupling frequency response curve thereof that a kind of superconducting resonator of the present invention is formed
Fig. 7 is coupled structure and the coupling frequency response curve thereof that a kind of folding line superconducting resonator is formed
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done description further.
Embodiment 1
With reference to Fig. 1,2, make a complete microstrip line, this microstrip line is the superconductive micro-strip line, and its upper strata micro belt conductor 3 and lower floor's ground plane conductor 1 are high-temperature superconducting thin film, and the centre is that dielectric constant is ε
r=10.05 Al
2O
3The monocrystalline dieelctric sheet.Form a geometric figure with upper and lower ring, its upper and lower ring does not all seal and the rectangle that is connected, last ring and down ring have a horizontal common edge, and go up ring and down ring be that symmetrical centre is centrosymmetric with the mid point of horizontal common edge, horizontal common edge is positioned at the stage casing of whole piece microstrip line.One end of microstrip line from the opening part of last ring along under encircle profile and extend downwards, the other end of microstrip line extends upward along last ring profile from the opening part of ring down.In this structure, resonance current mainly concentrates on the middle part of resonator, i.e. the horizontal common edge part of resonator, and therefore magnetic field radiation in the horizontal direction is very little.
Referring to Fig. 4, be that present embodiment one is according to given frequency f
0=1584MHz, crystal medium Al
2O
3, its DIELECTRIC CONSTANT
r=10.05, a superconducting microstrip resonator figure of design, its rectangle length of side is 10mm, and hem width is 5mm, and the live width of microstrip line is 0.5mm, and the vertical curve spacing is 0.5mm, the height 4.25mm of upper and lower ring.
Fig. 5 shows the resonance curve that present embodiment obtains through the Computer Simulation measuring and calculating, and the resonance frequency of its peak value correspondence is 1584.5MHz, and nonloaded Q is greater than 10000 as calculated.
Coupling coefficient between two resonators is measured by following method.Coupled structure and coupling frequency response curve thereof that Fig. 6 is made up of two resonators of the present invention, the curve among the figure is the transmission characteristic of this coupled structure, the frequency that its two peak values are corresponding respectively is f
1, f
2, correlation theory points out that the coupling coefficient k of this coupled structure can use formula (2) to calculate Δ f=f in the formula
2-f
1, f
0It is the resonator centre frequency.Coupling coefficient k is directly proportional with Δ f as can be seen.
Fig. 7 is coupled structure and the far field coupling frequency response curve thereof that a kind of folding line resonator is formed.Folding line resonator a kind of design form that to be Birmingham, GBR university announced in 2000, in order to guarantee the reliability of comparing result, the frequency of folding line resonator should be adjusted to 1584MHz, and the interval between two resonators is consistent with Fig. 6.The coupling coefficient of calculating this structure by formula (2), as can be seen, the difference on the frequency Δ f of the coupled structure among Fig. 7 is 4 times of resonator coupled structure difference on the frequency among Fig. 6, thus proof resonator of the present invention has more weak coupled characteristic.
The above-mentioned relatively method of coupling coefficient also can be used for other different designs scheme of resonator of the present invention, thereby can select the more excellent design of coupled characteristic.
Utilize a complete high-temperature superconductive micro-strip line, form one have on, the geometric figure of following ring, its upper and lower ring does not all seal and is connected.On, following ring is made of straight line (shown in Fig. 3 a).Last ring and down ring have a horizontal common edge, and go up ring and down ring be that symmetrical centre is centrosymmetric with the mid point of horizontal common edge, horizontal common edge is positioned at the stage casing of whole piece microstrip line.One end of microstrip line from the opening part of last ring along under encircle profile and detour, form one " L shaped ", the other end of microstrip line detours along last ring profile from the opening part of ring down, also forms one " L shaped ".In this structure, resonance current mainly concentrates on the middle part of resonator, i.e. the horizontal common edge part of resonator, and therefore magnetic field radiation in the horizontal direction is very little.Because the length of microstrip line is corresponding with certain resonance frequency, under the certain situation of microstrip line length, the structure in the employing present embodiment can be dwindled the area of resonator.
The present embodiment rectangle length of side is 11mm, and hem width is 5mm, and the live width of microstrip line is 0.5mm, and the spacing that detours between line and upper and lower ring outline line is 0.5mm, the height 3.75mm of upper and lower ring.
Utilize the relatively weak radiation characteristic of resonator of computer simulation technique, judge whether present embodiment meets the requirements.Its principle, method are identical with embodiment 1, repeat no more.
With a complete high-temperature superconductive micro-strip line, form one have on, the geometric figure of following ring, its upper and lower ring does not all seal and is connected.On, following ring is made of straight line and curve common (shown in Fig. 3 b).Last ring and down ring have a horizontal common edge, and go up ring and down ring be that symmetrical centre is centrosymmetric with the mid point of horizontal common edge, horizontal common edge is positioned at the stage casing of whole piece microstrip line.One end of microstrip line from the opening part of last ring along under encircle profile and detour, the other end of microstrip line detours along last ring profile from the opening part of ring down.In this structure, resonance current mainly concentrates on the middle part of resonator, i.e. the horizontal common edge part of resonator, and therefore magnetic field radiation in the horizontal direction is very little.
The upper and lower ring inside radius of present embodiment is 1.5mm, and the live width of microstrip line is 0.5mm, and the straight horizontal line length is 2.5mm.
Utilize the relatively weak radiation characteristic of resonator of computer simulation technique, judge whether present embodiment meets the requirements.Its principle, method are identical with embodiment 1, repeat no more.
Embodiment 4
With a complete high-temperature superconductive micro-strip line, form one have on, the geometric figure of following ring, its upper and lower ring does not all seal and is connected.On, following ring is made of straight line and curve common (shown in Fig. 3 c), last ring and down ring have a horizontal common edge, and go up ring and the following mid point that encircles with horizontal common edge is that symmetrical centre is centrosymmetric, horizontal common edge is positioned at the stage casing of whole piece microstrip line.One end of microstrip line from the opening part of last ring along under encircle profile and detour, the other end of microstrip line is from the opening part of ring detours this structure along last ring profile down, resonance current mainly concentrates on the middle part of resonator, be the horizontal common edge part of resonator, therefore magnetic field radiation in the horizontal direction is very little.
The ring inside radius was 1.5mm in present embodiment was upper and lower, and the outer shroud inside radius is 2.5mm, and the live width of microstrip line is 0.5mm, and the straight horizontal line length is 2.5mm.
Utilize the relatively weak radiation characteristic of resonator of computer simulation technique, judge whether present embodiment meets the requirements.Its principle, method are identical with embodiment 1, repeat no more.
The technology of the making microstrip line that relates among the present invention is a kind of prior art.Fig. 1 is the sectional view of microstrip line.Figure is micro belt conductor 3 at the middle and upper levels, and the centre is a medium 2, and lower floor is a ground plane conductor 1.Microstrip line among the present invention is the superconductive micro-strip line, and its upper strata micro belt conductor 3 and lower floor's ground plane conductor 1 are high-temperature superconducting thin film, and the centre is that dielectric constant is ε
rThe monocrystalline dieelctric sheet.The microstrip line geometry of mentioning among the present invention refers to the geometry that upper strata micro belt conductor 3 constitutes.When the design micro-strip resonantor, dielectric thickness h, DIELECTRIC CONSTANT
rBe known, resonance frequency f
0Be set-point.
Design work utilizes microwave simulation software (as sonnet) to carry out on computers among the present invention.
High temperature super conductive microstrip resonator among the present invention is made by conventional process, promptly makes by processing steps such as photoetching, dry method (or wet) etching, cutting, assemblings, belongs to those skilled in the art's known technology.
Claims (5)
1, a kind of plane high temperature super conductive microstrip resonator with low electromagnetic comprises a microstrip line of being made up of upper and lower two-layer high-temperature superconducting thin film and the artificial single crystal's medium between two-layer high-temperature superconducting thin film; It is characterized in that, described microstrip line is the shoestring of a continuous whole, form one and have the geometric figure structure of not sealing the ring and not sealing down the ring, described go up ring and encircle down have a horizontal common edge, this horizontal common edge is positioned at the stage casing of whole piece microstrip line; The described mid point of going up ring and encircling with horizontal common edge down is that symmetrical centre is centrosymmetric; One end of described microstrip line from the opening part of last ring along under encircle profile and extend downwards, the other end of microstrip line extends upward along last ring profile from the opening part of ring down.
2, by the described plane high temperature super conductive microstrip resonator with low electromagnetic of claim 1, described upper and lower ring is the not closed ring structure that is made of straight line, broken line or curve.
By the described plane high temperature super conductive microstrip resonator of claim 1, it is characterized in that 3, the upper and lower ring of described resonator is made of straight line with low electromagnetic.
By the described plane high temperature super conductive microstrip resonator with low electromagnetic of claim 1, it is characterized in that 4, ring is made of straight line and curve on the described resonator, described resonator ring down is made of straight line and curve.
By the described plane high temperature super conductive microstrip resonator of claim 1, it is characterized in that 5, the rectangle length of side of described resonator is 10mm with low electromagnetic, hem width is 5mm, the live width of microstrip line is 0.5mm, and the vertical curve spacing is 0.5mm, the height 4.25mm of upper and lower ring.
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| CN101546856B (en) * | 2008-03-27 | 2012-07-04 | 中国科学院物理研究所 | Planar superconducting microstrip resonator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1433582A (en) * | 1999-12-01 | 2003-07-30 | 纳幕尔杜邦公司 | Tunable high temperature superconducting filter |
| CN1160827C (en) * | 1998-05-15 | 2004-08-04 | 纳幕尔杜邦公司 | HTS filters with self-resonant spiral resonators |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1160827C (en) * | 1998-05-15 | 2004-08-04 | 纳幕尔杜邦公司 | HTS filters with self-resonant spiral resonators |
| CN1433582A (en) * | 1999-12-01 | 2003-07-30 | 纳幕尔杜邦公司 | Tunable high temperature superconducting filter |
Non-Patent Citations (1)
| Title |
|---|
| 高温超导小型化多曲折线滤波器研制. 羊凯，补世荣，张其劭，李宏福.科学通报，第47卷第18期. 2002 * |
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