CN102255129A - Planar superconductive microstrip line resonator - Google Patents
Planar superconductive microstrip line resonator Download PDFInfo
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- CN102255129A CN102255129A CN 201110124625 CN201110124625A CN102255129A CN 102255129 A CN102255129 A CN 102255129A CN 201110124625 CN201110124625 CN 201110124625 CN 201110124625 A CN201110124625 A CN 201110124625A CN 102255129 A CN102255129 A CN 102255129A
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Abstract
The invention relates to a planar superconductive microstrip line resonator, belonging to the field of microwave technologies. The resonator comprises an upper superconductive thin film, a lower superconductive thin film and a medium substrate between the upper superconductive thin film and the lower superconductive thin film, and is characterized in that the upper superconductive thin film is formed by using a continuously integral superconductive microstrip line to spirally surround for two to four circles clockwise or anticlockwise from inside to outside. The resonator can remarkably improve the undesired frequency, and pushes the secondary harmonic frequency to a position of which the frequency is about three times that of a fundamental frequency. The resonator is suitable for manufacturing a superconductive filter of which the relative bandwidth is in the range of 0.5%-20%.
Description
Technical field
The invention belongs to microwave technical field, particularly planar superconducting microstrip line resonator.
Background technology
Filter has the frequency-selecting function, i.e. signal by required frequency, and inhibition does not need the signal of frequency, is a kind of crucial microwave component of microwave engineering technical field, is widely used in fields such as mobile communication, satellite communication, radar and other microwave communication.Because superconductor is compared high two to three orders of magnitude of common metal material in the conductivity of microwave band, thereby be used to make the excellent more filter of performance.
The coupled resonance filter of being made up of mini strip line resonator is a kind of crucial way of realization of microwave filter.The section of planar superconducting microstrip line is made of upper strata superconducting thin film 11, lower floor's superconducting thin film 12 and the dielectric substrate between two-layer superconducting thin film 13 as shown in Figure 1.
Upper strata superconducting thin film 11 is made of the linear pattern strip line of a two ends open circuit usually, and length is about resonance frequency half of corresponding wavelength on the microstrip line dielectric substrate.Because the periodicity of microstrip line distributed circuit frequency response, this half-wavelength linear pattern mini strip line resonator produces secondary harmonics, three parasitic resonance frequencies such as harmonics again at the integral multiple place of fundamental frequencies such as two frequencys multiplication, frequency tripling, thereby makes the filter be made up of the half-wavelength mini strip line resonator produce parasitic passband again leaving design passband a distance.Filter is very low at the inhibition degree at parasitic passband place, causes the unwanted frequency signal by filter, thereby influences the performance of filter.When particularly being positioned at the comparatively intensive electromagnetic spectrum close quarters of various microwave communications such as mobile communication, cable TV when filter passband, requirement to the parasitic passband characteristic is strict more, needs filter to have good inhibition degree in the very wide in addition stopband range of passband.
In recent years, the researcher has proposed the parasitic passband characteristic that multiple resonator structure is used to improve filter.(the secondary harmonics is positioned at 3 times of fundamental frequency and locates to adopt 1/4 wavelength mini strip line resonator structure of a terminal shortcircuit can make parasitic frequency only appear at the odd-multiple place of fundamental frequency, three harmonics are positioned at 5 times of fundamental frequency and locate), thus the parasitic path characteristic of filter improved.Yet the grounding requirement of 1/4 wavelength microstrip line short-circuit end will increase preparation technology's complexity, at more crisp substrate (as magnesium oxide MgO, lanthanum aluminate LaAlO
3) on be grounded and also have certain difficulty (Zhou J, Lancaster M J, Huang F, IEEE Trans.Applied Supercond., 14 (2004), 28).Adopt zigzag coupling microstrip line structure (Kuo J, Hsu W, Huang W, IEEE Microw.Wireless Compon.Lett., 12 (2002), 383) and substrate mounting structure (Kuo J, Jiang M, Chang H, IEEE Trans.Microw.Theory Tech., 52 (2004), 83), thereby can reach the purpose that suppresses frequency multiplication and parasitic passband response, yet these two kinds of methods having relatively high expectations to preparation technology by the parity mode phase velocity in the balance coupled microstrip line.Adopt step electric impedance resonator structure (Jin S, Wei B, Zhang X, et al, Microwave opt.tech.lett., 49 (2007), 2097) also the parasitic passband of filter can be moved to high frequency, yet the step impedance structure is applicable to higher frequency band usually, faces the difficulty that resonator dimensions is big, be difficult to realize miniaturization when low-frequency range.
The simplest half-wavelength mini strip line resonator of existing structure is a linear pattern resonator 21, shown in Fig. 2 (a).This resonator substrate for use material is magnesium oxide MgO, and thickness is 0.5mm, DIELECTRIC CONSTANT
rBe 9.71.The microstrip line live width is 0.08mm, and length is 96.04mm.Use Electromagnetic Simulation software Sonnet that this linear pattern resonator is carried out basic as can be known time resonance frequency (fundamental frequency) 22 of emulation and be 640.85MHz, secondary resonance frequency (secondary frequently) 23 is 1282.1MHz frequently, three resonance frequencys (three frequencies) 24 are 1924MHz, shown in Fig. 2 (b).Secondary resonance frequency and three resonance frequencys are about 2 times and 3 times of base time resonance frequency respectively.When this resonator during at fundamental frequency place resonance, shown in Fig. 2 (c), the sense of current unanimity on the linear pattern resonator microstrip line flows to microstrip line one end to electric current simultaneously with linear pattern resonator length distribution schematic diagram, perhaps flows to an other end of microstrip line simultaneously.Linear pattern resonator middle part electric current is big, and the two ends electric current is little, and port current is zero, is half sinusoidal period and distributes; When linear pattern resonator during at secondary harmonics place resonance, electric current with linear pattern resonator length distribution schematic diagram shown in Fig. 2 (d), linear pattern resonator left and right sides two halves current opposite in direction, two-port and intermediate current are zero, 1/4 total microstrip line length place electric current maximum apart from two ends is a sinusoidal period and distributes.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art, proposed a kind of planar superconducting microstrip line resonator, can significantly raise parasitic frequency, the secondary harmonics is raised the position that is three times in fundamental frequency approximately.This planar superconducting microstrip line resonator another one advantage is to be applicable to make the very super conductive filter of wide region of relative bandwidth from 0.5% to 20%.
In order to reach the foregoing invention purpose, the present invention proposes a kind of planar superconducting microstrip line resonator, comprise upper strata superconducting thin film, lower floor's superconducting thin film and the dielectric substrate between two-layer superconducting thin film, it is characterized in that described upper strata superconducting thin film is made of clockwise or counterclockwise spiral surrounding two to four circles in interior past outer for the superconductive tape line with a continuous whole.
Above-mentioned strip line can be to be connected to form by linear pattern band section, also can be connected and composed by arc line type band section.
The live width of above-mentioned strip line is 0.01mm to 0.50mm preferably.
The wire spacing of above-mentioned strip line is from preferred 0.01mm to 0.10mm.
Characteristics of the present invention and effect
The present invention utilizes the characteristics of half-wavelength mini strip line resonator CURRENT DISTRIBUTION, has proposed a kind of planar superconducting microstrip line resonator, can significantly raise parasitic frequency, the secondary harmonics is raised the position that is three times in fundamental frequency approximately.
This planar superconducting microstrip line resonator another one advantage is the single coil configuration owing to this resonator, and its electromagnetic field at the fundamental frequency place is relatively dispersed, thereby can produce bigger coupling with adjacent resonators, thereby realizes the design of broadband filter.Change coupling coefficient by the distance of adjusting adjacent resonators, make the very super conductive filter of wide region of relative bandwidth from 0.5% to 20%.
Description of drawings
Fig. 1 is the sectional view of planar superconducting microstrip line.
Fig. 2 a is a half-wavelength linear pattern mini strip line resonator circuit diagram.
Fig. 2 b is the stimulation frequency resonse characteristic of half-wavelength linear pattern mini strip line resonator.
Fig. 2 c is the CURRENT DISTRIBUTION schematic diagram of half-wavelength linear pattern mini strip line resonator at the fundamental frequency place.
Fig. 2 d is the CURRENT DISTRIBUTION schematic diagram of half-wavelength linear pattern mini strip line resonator at secondary harmonics place.
First kind of embodiment of a kind of planar superconducting microstrip line resonator that Fig. 3 a proposes for the present invention be superconducting thin film structure schematic diagram at the middle and upper levels.
Fig. 3 b is the stimulation frequency resonse characteristic of first kind of example structure of a kind of planar superconducting microstrip line resonator of the present invention's proposition.
Second kind of embodiment of a kind of planar superconducting microstrip line resonator that Fig. 4 a proposes for the present invention be superconducting thin film structure schematic diagram at the middle and upper levels.
Fig. 4 b is the stimulation frequency resonse characteristic of second kind of example structure of a kind of planar superconducting microstrip line resonator of the present invention's proposition.
The third embodiment of a kind of planar superconducting microstrip line resonator that Fig. 5 a proposes for the present invention is superconducting thin film structure schematic diagram at the middle and upper levels.
Fig. 5 b is the stimulation frequency resonse characteristic of the third example structure of a kind of planar superconducting microstrip line resonator of the present invention's proposition.
Fig. 6 is the implementation structure of upper strata other several distortion of superconducting thin film of a kind of planar superconducting microstrip line resonator of the present invention's proposition.
Fig. 6 a is three circle rectangle endless belt upper strata superconducting thin film structures.
Fig. 6 b is two circle rectangle endless belt upper strata superconducting thin film structures.
Fig. 6 c is the square endless belt of three a circles upper strata superconducting thin film structure.
Fig. 6 d is the square endless belt of four a circles upper strata superconducting thin film structure.
Fig. 6 e is the fat cross endless belt of three a circles upper strata superconducting thin film structure.
Fig. 6 f is three circle arch rectangle endless belt upper strata superconducting thin film structures.
Fig. 6 g is the semicircle endless belt of three a circles upper strata superconducting thin film structure.
Fig. 6 h is the circular endless belt of three a circles upper strata superconducting thin film structure.
Embodiment
Below in conjunction with specific embodiment the present invention is described in further detail.
First embodiment
With reference to Fig. 1, utilize a complete microstrip line, this microstrip line is the planar superconducting microstrip line, comprises upper strata superconducting thin film 11, lower floor's superconducting thin film 12 and the dielectric substrate between two-layer superconducting thin film 13.Upper strata superconducting thin film 11 structures of present embodiment are the superconductive tape lines of a two ends open circuit shown in Fig. 3 (a), and strip line constitutes around three circles 31 outward in the counterclockwise direction from interior.In the present embodiment, upper and lower layer superconducting thin film adopts high-temperature superconducting thin film, and dielectric substrate 13 adopts magnesium oxide MgO material, and thickness is 0.50mm, and dielectric constant is 9.71.
Fig. 3 (a) is that the given fundamental frequency of present embodiment is 427.1MHz, a planar superconducting microstrip line resonator structure of design.Bung flange in this structure is rectangle bung flange 31, and the outline of outermost layer bung flange is long to be 2.32mm, and wide is 14.4mm.The strip line total length is 96.04mm, and live width is 0.08mm, adjacent bung flange equidistantly and spacing be 0.04mm.
The frequency response characteristic that Fig. 3 (b) obtains through Electromagnetic Simulation software Sonnet emulation for present embodiment, its fundamental resonance frequency 32 is 427.1MHz, secondary harmonics frequency 33 is 1220.65MHz, three times harmonics frequency 34 is 2016.5MHz, this resonator secondary harmonics frequency is 2.87 times of fundamental frequency, be about 2 times of fundamental frequency with linear pattern mini strip line resonator secondary harmonics frequency and compare, significantly improved the parasitic frequency response characteristic.
From the foregoing description as can be seen, the reason that resonator structure of the present invention improves resonator parasitic frequency characteristic is: when resonator during at fundamental frequency place resonance, the sense of current on the adjacent microstrip line is identical, can produce bigger self-inductance, thereby cause the fundamental resonance frequency of resonator to reduce, make the fundamental frequency of resonator shown in Fig. 3 (a) only be 427.1MHz, far below the fundamental frequency 640.85MHz of Fig. 2 (a) linear pattern resonator.When resonator during at secondary harmonics place resonance, the sense of current on the adjacent microstrip line is incomplete same, self-inductance is little, influence to the secondary harmonics of resonator is little, the secondary harmonics simulation result of resonator shown in Fig. 3 (a) is 1220.65MHz, is more or less the same with the secondary harmonics 1282.1MHz of Fig. 2 (a) linear pattern resonator.Comprehensive above reason makes the ratio of resonator secondary harmonics frequency of the present invention and fundamental frequency much larger than the linear pattern resonator, thereby has improved the parasitic frequency response characteristic of resonator.
Second embodiment
With reference to Fig. 1, utilize a complete microstrip line, this microstrip line is the planar superconducting microstrip line, comprises upper strata superconducting thin film 11, lower floor's superconducting thin film 12 and the dielectric substrate between two-layer superconducting thin film 13.Upper strata superconducting thin film 11 structures of present embodiment are the superconductive tape lines of a two ends open circuit shown in Fig. 4 (a), and strip line constitutes around two circles 41 outward along clockwise direction from interior.In the present embodiment, upper and lower layer superconducting thin film adopts high-temperature superconducting thin film, and dielectric substrate 13 adopts magnesium oxide MgO material, and thickness is 0.50mm, and dielectric constant is 9.71.
Fig. 4 (a) is that the given fundamental frequency of present embodiment is 1180MHz, a planar superconducting microstrip line resonator structure of design.Bung flange in this structure is square bung flange 41, and the outline of outermost layer bung flange is long to be 5mm, and wide is 5mm.The strip line total length is 36.6mm, and live width is 0.2mm, adjacent bung flange equidistantly and spacing be 0.04mm.
The frequency response characteristic that Fig. 4 (b) obtains through Electromagnetic Simulation software Sonnet emulation for present embodiment, its fundamental resonance frequency 42 is 1180MHz, secondary harmonics frequency 43 is 3553MHz, is 3.01 times of fundamental frequency.
The 3rd embodiment
With reference to Fig. 1, utilize a complete microstrip line, this microstrip line is the planar superconducting microstrip line, comprises upper strata superconducting thin film 11, lower floor's superconducting thin film 12 and the dielectric substrate between two-layer superconducting thin film 13.Upper strata superconducting thin film 11 structures of present embodiment are the superconductive tape lines of a two ends open circuit shown in Fig. 5 (a), and strip line constitutes around four circles 51 outward along clockwise direction from interior.In the present embodiment, upper and lower layer superconducting thin film adopts high-temperature superconducting thin film, and dielectric substrate 13 adopts magnesium oxide MgO material, and thickness is 0.50mm, and dielectric constant is 9.71.
Fig. 5 (a) is that the given fundamental frequency of present embodiment is 488.4MHz, a planar superconducting microstrip line resonator structure of design.Bung flange in this structure is square bung flange 51, and the outline of outermost layer bung flange is long to be 5mm, and wide is 5mm.The strip line total length is 76.56mm, and live width is 0.04mm, adjacent bung flange equidistantly and spacing be 0.02mm.
The frequency response characteristic that Fig. 5 (b) obtains through Electromagnetic Simulation software Sonnet emulation for present embodiment, its fundamental resonance frequency 52 is 488.4MHz, secondary harmonics frequency 53 is 1465.7MHz, is 3.0 times of fundamental frequency.
Just the present invention will be described for example for the foregoing description, but the present invention is not limited thereto, can carry out the various deformation and the different number of turns on this basis, be the distortion such as rectangle, semicircle and circle of arch such as but not limited to the rectangle among Fig. 6 (a)-(h), square, cross, an end.In addition, though selected magnesium oxide MgO substrate in the foregoing description for use, can use lanthanum aluminate LaAlO fully as required
3The substrate of other material such as substrate, sapphire.These distortion also should belong to same design concept of the present invention, all should be within protection scope of the present invention.
Claims (4)
1. planar superconducting microstrip line resonator, comprise upper strata superconducting thin film, lower floor's superconducting thin film and the dielectric substrate between two-layer superconducting thin film, it is characterized in that described upper strata superconducting thin film is made of clockwise or counterclockwise spiral surrounding two to four circles in interior past outer for the superconductive tape line with a continuous whole.
2. resonator according to claim 1 is characterized in that described strip line is to be connected to form or to be connected and composed by arc line type band section by linear pattern band section.
3. resonator according to claim 1 is characterized in that the live width of described strip line is 0.01mm to 0.50mm.
4. resonator according to claim 1 is characterized in that the wire spacing of described strip line is 0.01mm to 0.10mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106450612A (en) * | 2016-11-23 | 2017-02-22 | 广西大学 | High-Q-value low-loss ultrahigh-frequency high-temperature superconducting filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301411A (en) * | 1998-05-15 | 2001-06-27 | 纳幕尔杜邦公司 | HTS filters with self-resonant spiral resonators |
| CN1925212A (en) * | 2005-08-31 | 2007-03-07 | 中国科学院物理研究所 | Plane superconductive micro-strip resonator |
| CN101369680A (en) * | 2005-03-21 | 2009-02-18 | 中国科学院物理研究所 | Method for detecting and optimizing plane superconducting microstrip resonator |
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2011
- 2011-05-13 CN CN 201110124625 patent/CN102255129A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301411A (en) * | 1998-05-15 | 2001-06-27 | 纳幕尔杜邦公司 | HTS filters with self-resonant spiral resonators |
| CN101369680A (en) * | 2005-03-21 | 2009-02-18 | 中国科学院物理研究所 | Method for detecting and optimizing plane superconducting microstrip resonator |
| CN1925212A (en) * | 2005-08-31 | 2007-03-07 | 中国科学院物理研究所 | Plane superconductive micro-strip resonator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106450612A (en) * | 2016-11-23 | 2017-02-22 | 广西大学 | High-Q-value low-loss ultrahigh-frequency high-temperature superconducting filter |
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Application publication date: 20111123 |