CN102255123A - High temperature superconductive microstrip filter with tap structure - Google Patents
High temperature superconductive microstrip filter with tap structure Download PDFInfo
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- CN102255123A CN102255123A CN 201110120697 CN201110120697A CN102255123A CN 102255123 A CN102255123 A CN 102255123A CN 201110120697 CN201110120697 CN 201110120697 CN 201110120697 A CN201110120697 A CN 201110120697A CN 102255123 A CN102255123 A CN 102255123A
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Abstract
The invention relates to a high temperature superconductive microstrip filter with a tap structure, which belongs to the field of microwave communication technology equipment. The microwave filter comprises an input feeder, an output feeder, and a plurality of sections of U type half wavelength resonators which are arranged in parallel, and is characterized in that: at least one section of half wavelength resonator is a resonator with the tap structure and is used for introducing a transmission zero into the passband edge of the filter. In the high temperature superconductive microstrip filter, the appropriate transmission zero is introduced by using the tap structure to make a transitional zone steep. The high temperature superconductive microstrip filter has the advantages of small overall size, low insertion loss, high out-of-band rejection and the like, is used for manufacturing a high temperature superconductive filter and is suitable for a plane type common metal microstrip filter.
Description
Technical field
The invention belongs to the microwave communication equipment technical field, particularly the design of microwave filter.
Background technology
Microwave filter is crucial microwave component, desirable filter characteristic should be passband undamped and in cut-off region decay infinitely great, the saltus step of passband and cut-off region is precipitous as much as possible.At present, the target of Design of Filter is under the as far as possible little prerequisite of overall filter size, makes the in-band insertion loss of filter lower, and passband edge is more precipitous, thereby realizes good selectivity.
For the reduction of in-band insertion loss, the use of high temperature superconducting materia has key effect.Along with the development of high-temperature superconducting thin film material preparation process, promoted the practicalization of superconductive micro-strip line filter.The superconductive micro-strip line has very low microwave surface resistance, makes that superconductive micro-strip line filter in-band insertion loss is very little.Existing experimental result shows that the superconductive micro-strip line filter can have extremely low insertion loss and passband flat characteristic, more approaches ideal filter on performance.
For the raising of band edge steepness, then depend on method for designing.In traditional filter design method, adopt the method that increases joint number to improve the band edge steepness usually.But the increase of joint number will increase the overall dimensions of filter significantly, and cause pass band damping to become big, make performance of filter worsen.In recent years, in the research of Filter Design method, be applied in passband edge and introduce the mode of transmission zero and improve the band edge steepness and enjoy favor.In the research in the past, many methods all are used to produce transmission zero.People such as the Jiasheng Hong of Birmingham, GBR university introduce cross-couplings by resonator layout type straggly, realized a pair of transmission zero, see Hong J and Lancaster M J for details, " Design of Highly Selective Microstrip Bandpass Filters with a Single Pair of Attenuation Poles at Finite Frequencies ", IEEE Trans.Microwave Theory Tech., VOL.48, NO.7, JULY 2000, PP.1098-1107.Thisly realize that by special resonator layout cross-linked method is very limited its structure, and when high frequency in order to avoid the layout that the enclosure pattern must adopt sleeve configuration, this method is difficult to realize.The researcher of U.S. Conductus company is that bridge is set up cross-couplings between non-adjacent resonator by a coupled microstrip line, introduced transmission zero, see Shen Y and Sans C for details, IEEE MIT-S Digest, " Ultra Selective HTS Bandpass Filter for 3G Wireless Application ", VOL.13, NO.2, JUNE 2003, PP.261-264.When yet frequency is higher, the resonator dimensions that constitutes filter is little, the electrical length of coupled microstrip line even also longer than the electrical length of resonator self, coupled microstrip line can be introduced a series of unwanted modes of resonance near passband, be difficult to realize good performance of filter.In addition, also be used to realize the high band edge steepness response of filter by the method for on the input and output feeder line, introducing quarter-wave band resistance line or other trap wave unit, but this method can increase the length of feeder line, and influences outside input and output Q value, increases design difficulty.
Summary of the invention
The objective of the invention is to propose a kind of microstrip filter that contains tap structure for overcoming the weak point of prior art.Adopt the method for directly on 1/2nd wave resonator, introducing tap structure, realize controllable transmission zero points at the filter passband edge, improve the band edge steepness of filter.
For realizing purpose of the present invention, by the following technical solutions:
A kind of high-temperature superconductive micro-strip filter that contains tap structure, comprise incoming feeder, output feeder, more piece U type 1/2nd wave resonator that are arranged in parallel, it is characterized in that, having described 1/2nd wave resonator of a joint at least is the resonator that has tap structure, in order to introduce transmission zero at the filter passband edge.
Described tap structure links to each other with the middle part virtual earth of this 1/2nd wave resonator.
In the described resonator effective length of tap structure be transmission zero frequency institute corresponding wavelength 1/4th.
The tap structure of described resonator can be made of the high impedance section of bending and the Low ESR section of rectangle.
Described filter can adopt the YBCO high-temperature superconducting thin film to make.
The present invention utilizes tap structure to introduce appropriate transmission zero at the filter passband edge, makes transition band precipitous, and it is little to have an overall dimensions, and it is low to insert loss, and band is outer to suppress advantage such as good.
The present invention is used to make high temperature superconduction wave filter, also is applicable to plane common metal microstrip filter.
Description of drawings
Fig. 1 is the incoming feeder that comprises of the present invention, output feeder, the structural representation of the primary filter of resonator group.
Fig. 2 is the used U type of a filter of the present invention step electric impedance resonator.
Fig. 3 is the U type step electric impedance resonator that comprises tapped structure of the present invention.
Fig. 4 is the topology layout schematic diagram that comprises the super conductive filter of a tap structure of the present invention.
Fig. 5 is the response curve of the super conductive filter that comprises a tap structure among Fig. 4.
Fig. 6 is the topology layout schematic diagram that comprises the super conductive filter of two tap structures of the present invention.
Fig. 7 is the response curve of the super conductive filter that comprises two tap structures among Fig. 6.
Fig. 8 is the response curve comparison diagram that comprises two tap structures and do not comprise the super conductive filter of tap structure.
Embodiment
The microstrip filter that contains tap structure that the present invention proposes reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
Specific embodiment is that a centre frequency is 7.42GHz, the band pass filter of relative bandwidth 2.2%.Adopt two-sided yttrium barium copper oxide (YBCO) superconducting thin film, substrate material is MgO, and thickness is 0.50mm, and relative dielectric constant is 9.7.
The primary filter structure of present embodiment can design by electromagnetic field simulation software.As shown in Figure 1,11,12,13,14 is first, second, third, fourth joint resonator of filter.15,16 are input, output feeder.The resonator that Fig. 1 median filter is selected for use is a U type step electric impedance resonator, is 1/2nd wave resonator, and size is determined according to work centre frequency 7.42GHz.As shown in Figure 2,21 is the high impedance section of U type step electric impedance resonator, the width 0.3mm of microstrip line, 2.2 millimeters of length.22 and 23 is the Low ESR section, and micro belt line width is 1.0mm, and length is 1.87 millimeters.
Then, directly on 1/2nd wave resonator, connect tap structure, as shown in Figure 3.
Described tap structure 3S, the position of its connection is in the virtual earth place, middle part of 1/2nd wave resonator.According to transmission line theory, during 1/2nd wave resonator fundamental resonances, resonator middle part voltage is zero, can be considered virtual earth, introduces tap structure herein and can ignore the influence of fundamental resonance.
Described tap structure 3S, its be of a size of transmission zero frequency institute corresponding wavelength 1/4th.Tap structure 3S is made of the high impedance section of bending and the Low ESR section of rectangle.3S1 is the hachure section of tap structure, and 3S2 is the rectangular block of tap structure.The overall dimensions compactness that high low-impedance collocation makes tap, adjustable parameter is many, and is effective flexibly to the adjusting of transmission zero location.
Present embodiment is formed super conductive filter by 1/2nd wave resonator with a tap structure and three 1/2nd common wave resonator, and this super conductive filter topology layout as shown in Figure 4.41,42,43,44 is first, second, third, fourth joint resonator of filter, and 41S is the tap structure that connects on the first segment resonator, and 45,46 are input, output feeder.Overall filter size 24.0 * 8.0mm.
The tap structure 41S of present embodiment is made of the high impedance section of bending and the Low ESR section of rectangle.High impedance section width 0.1mm, length 2.2mm can equivalence be an inductance.The rectangular block of Low ESR section is of a size of 0.6mm * 1.5mm, can equivalence be electric capacity.The effective dimensions of tap need meet the demands, and is 90 degree in the corresponding electrical length in the frequency place of transmission zero.
Present embodiment comprise a tap structure super conductive filter response curve as shown in Figure 5.51 is transmission curve S21, and two transmission zeros are arranged in the transmission curve, and wherein 511 is the transmission zero that the non-adjacent coupling of resonator produces, 512 transmission zeros for the tap structure introducing, and frequency is 7.6GHz.52 is reflectivity curve S11.
According to performance need, present embodiment 2 is formed super conductive filter by 1/2nd wave resonator with two tap structures and two 1/2nd common wave resonator, promptly increases a tap structure on the basis of the foregoing description 1 again.This super conductive filter topology layout as shown in Figure 6.61,62,63,64 is first, second, third, fourth joint resonator of filter, and 61S is the tap structure that connects on the first segment resonator, and 64S is the tap structure that connects on the 4th joint resonator, and 65,66 are input, output feeder.The overall filter size remains 24.0 * 8.0mm.
Tap structure need be finely tuned the whole filter layout after introducing, and optimization Simulation is to obtain good response curve.Present embodiment 2 comprise two tap structures super conductive filter response curve as shown in Figure 7.71 is transmission curve S21, as seen three transmission zeros are arranged in the transmission curve, wherein 711 is the transmission zero that the non-adjacent coupling of resonator produces, 712 transmission zeros for the tap structure introducing, frequency is 7.58GHz, 713 another transmission zeros for the tapped-resonator introducing, frequency is 7.64GHz.72 is reflectivity curve S11.
Microstrip filter of the present invention, by the introducing of tap structure, the transmission zero of generation has been improved the band edge steepness of filter effectively.Comprise two tap structures and do not comprise tap structure super conductive filter response curve contrast as shown in Figure 8.81 is the frequency response chart that does not contain the super conductive filter of tapped-resonator, and 82 contain the frequency response chart of the super conductive filter of two tapped-resonator.The high temperature superconduction wave filter band edge steepness that comprises tap structure of the present invention obviously improves, and has realized purpose of the present invention.
Though describe the present invention on the basis of the foregoing description, the present invention is not limited thereto, the people with association area background knowledge can carry out various deformation on this basis.
Claims (5)
1. high-temperature superconductive micro-strip filter that contains tap structure, comprise incoming feeder, output feeder, more piece U type 1/2nd wave resonator that are arranged in parallel, it is characterized in that, having described 1/2nd wave resonator of a joint at least is the resonator that has tap structure, in order to introduce transmission zero at the filter passband edge.
2. high-temperature superconductive micro-strip filter as claimed in claim 1 is characterized in that, described tap structure links to each other with the middle part virtual earth of this 1/2nd wave resonator.
3. high-temperature superconductive micro-strip filter as claimed in claim 1 is characterized in that, in the described resonator effective length of tap structure be transmission zero frequency institute corresponding wavelength 1/4th.
4. high-temperature superconductive micro-strip filter as claimed in claim 1 is characterized in that, the tap structure of described resonator is made of the high impedance section of bending and the Low ESR section of rectangle.
5. each described high-temperature superconductive micro-strip filter among the claim 1-4 is characterized in that, described filter adopts the YBCO high-temperature superconducting thin film to make.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187602A (en) * | 2013-03-11 | 2013-07-03 | 华南理工大学 | Miniaturized controllable three-frequency filter based on open-circuit step impedance line loading |
| CN104409816A (en) * | 2014-11-26 | 2015-03-11 | 华南理工大学 | Plane band-pass filter capable of realizing ultra-wide stop-band suppression |
| CN105024122A (en) * | 2015-07-21 | 2015-11-04 | 天津大学 | Three-passband microstrip filter based on SIR structure |
| CN110311196A (en) * | 2019-06-18 | 2019-10-08 | 天津大学 | The 5G double-passband filter of suspended substrate stripline is integrated based on medium |
| CN110931926A (en) * | 2019-11-12 | 2020-03-27 | 郴州世通科技有限公司 | Microstrip line filter |
| CN113270701A (en) * | 2021-05-20 | 2021-08-17 | 南通大学 | Miniaturized filtering phase shifter |
| CN114678669A (en) * | 2020-12-24 | 2022-06-28 | Tdk株式会社 | Band-pass filter |
| CN115275544A (en) * | 2022-08-15 | 2022-11-01 | 南通大学 | Zero-point controllable dielectric waveguide filter based on heterogeneous dual-mode resonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201590466U (en) * | 2010-01-06 | 2010-09-22 | 天津工程师范学院 | High image reject band-pass filter |
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2011
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| CN201590466U (en) * | 2010-01-06 | 2010-09-22 | 天津工程师范学院 | High image reject band-pass filter |
Non-Patent Citations (2)
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| 《IEEE MICROWAVE AND GUIDED WAVE LETTERS》 20001231 Jae-Ryong Lee et al. New Compact Bandpass Filter Using Microstrip lambda/4 Resonators with Open Stub Inverter 第10卷, 第12期 * |
| 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 20030131 Lei Zhu et al. Compact Microstrip Bandpass Filter With Two Transmission Zeros Using a Stub-Tapped Half-Wavelength Line Resonator 第13卷, 第1期 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187602A (en) * | 2013-03-11 | 2013-07-03 | 华南理工大学 | Miniaturized controllable three-frequency filter based on open-circuit step impedance line loading |
| CN103187602B (en) * | 2013-03-11 | 2015-07-01 | 华南理工大学 | Miniaturized controllable three-frequency filter based on open-circuit step impedance line loading |
| CN104409816A (en) * | 2014-11-26 | 2015-03-11 | 华南理工大学 | Plane band-pass filter capable of realizing ultra-wide stop-band suppression |
| CN105024122A (en) * | 2015-07-21 | 2015-11-04 | 天津大学 | Three-passband microstrip filter based on SIR structure |
| CN110311196A (en) * | 2019-06-18 | 2019-10-08 | 天津大学 | The 5G double-passband filter of suspended substrate stripline is integrated based on medium |
| CN110931926A (en) * | 2019-11-12 | 2020-03-27 | 郴州世通科技有限公司 | Microstrip line filter |
| CN114678669A (en) * | 2020-12-24 | 2022-06-28 | Tdk株式会社 | Band-pass filter |
| US11955681B2 (en) | 2020-12-24 | 2024-04-09 | Tdk Corporation | Band-pass filter |
| CN113270701A (en) * | 2021-05-20 | 2021-08-17 | 南通大学 | Miniaturized filtering phase shifter |
| CN113270701B (en) * | 2021-05-20 | 2022-06-10 | 南通大学 | Miniaturized filtering phase shifter |
| CN115275544A (en) * | 2022-08-15 | 2022-11-01 | 南通大学 | Zero-point controllable dielectric waveguide filter based on heterogeneous dual-mode resonator |
| CN115275544B (en) * | 2022-08-15 | 2023-09-01 | 南通大学 | Zero-point controllable dielectric waveguide filter based on heterogeneous dual-mode resonator |
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Application publication date: 20111123 |