CN1252859C - Microstrip line resonator and its microwave filter - Google Patents
Microstrip line resonator and its microwave filter Download PDFInfo
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- CN1252859C CN1252859C CN 02155606 CN02155606A CN1252859C CN 1252859 C CN1252859 C CN 1252859C CN 02155606 CN02155606 CN 02155606 CN 02155606 A CN02155606 A CN 02155606A CN 1252859 C CN1252859 C CN 1252859C
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Abstract
The present invention belongs to the technical field of a microwave narrow band filter, which relates to a microstrip line resonator and a microwave filter thereof. The resonator of the present invention can form a single folding annular band structure by two annular bands of which the ends are communicated, wherein one annular band comprises a gap, one end communicated with the two annular bands is a closed end, and the other end is an open end. The resonator of the present invention can also form a double-folding annular band structure by three annular bands of which the ends are orderly communicated, wherein the first annular band comprises a gap; the second annular band is connected with the first annular band; the third annular band is connected with the second annular band; one end communicated with the first annular band and the second annular band is a closed end, and the other end is an open end. The present invention also comprises a filter which is formed on the basis of a microstrip line resonator structure. The filter comprises a resonator array which is composed of a plurality of single folding annular band resonators and double-folding annular band resonators which are orderly and parallelly arranged. The present invention has the advantages of small insertion loss, large out-of-band inhibition, steep transition band, simple and direct constructed filter structure, small integration dimension, etc.
Description
Technical field
The invention belongs to the technical field of microwave narrow-band, particularly the microwave filter structural design.
Background technology
Filter is a kind of crucial microwave component, and its major function is to be used for crossover frequency, promptly blocks the signal of other frequencies by the signal of certain frequency.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.Reach the precipitous characteristic of band edge, generally can be improved by the joint number that increases filter.The increase of the joint number loss that will induce one significantly makes pass band damping become big, and performance of filter worsens.This makes that the loss of common microstripline filter is generally bigger, and to the field of having relatively high expectations, for example satellite application does not just reach desired index, generally at this moment just can only realize with waveguide device.
In recent years,, comprised the development of single crystal samples and film etc., and made the practicability of super conductive filter become possibility along with the preparation technology of high temperature superconducting materia.The super conductive filter loss is little, and anti-adjacent frequency interference performance is strong, resonator Q value high (in several thousand MHz scopes, its Q value can reach 40000-100000).Utilize these characteristics of superconductive micro-strip line, can replace waveguide filter with the superconductive micro-strip line filter.From existing experimental result, the superconductive micro-strip line filter can have precipitous band edge, and the extremely low smooth pass-band performance of insertion loss more approaches ideal filter on performance.Therefore the high-temperature superconductive micro-strip line filter not only have can with the performance of waveguide device ratio, and it is little to have the microstrip line volume simultaneously concurrently, lightweight advantage.
Filter Structures has played decisive role to the characteristic of filter.At present, the target of design is to make under the as far as possible little prerequisite of overall filter, makes the in-band insertion loss of filter lower, and band edge is steeper.
Fig. 1 has shown one the 8 joint Open-loop shape super conductive filter that Britain delivered in 2000, and substrate material is LaAlO
3, be of a size of 39*23.5mm.Its resonator is 8 ring-band shapes that a breach is arranged (marking with digital 1-8 respectively among the figure) that distribute with axial symmetry, and the width of breach is Wg.Analyze its electromagnetic field as can be known, the opening that electric field mainly is distributed in ring goes out, and therefore is equivalent to an electric capacity herein; Magnetic field mainly is distributed in the opposite side of ring, so the microstrip line of ring-type approaches inductance.Input and output feeder line 11 and 12 width W O correspondence 50 ohm of input and output impedances, and the length of feeder line is got several millimeters according to technological requirement and got final product not influence of performance of filter.Feeder line 11 and 12 and separately adjacent resonators 1 and 8 position contacting determine by the input and output impedance matching.8 resonator shape sizes are close or identical, and its ring-band shape microstrip line total length is about at this LaAlO
3Half of on-chip filter center frequency corresponding wavelength.Distance between each resonator has determined the performance of filter.Distance in the design between each resonator of need adjustment is till filter response meets the demands.
Fig. 2 is the frequency response chart of filter under 55K and low noise amplifier combination condition for this reason.Among the figure, 21 is the loss S21 characteristic curve of filter, and 22 is the reflection loss S11 characteristic curve of filter.Its passband reflection coefficient is about-15.5dB, and band edge steepness low side is 20dB/MHz, and high-end is 15dB/MHz.Though the resonator Q value of this filter is very high, have in the good band and steepness, but because its resonator shape is too huge, and can not very effectively utilize the substrate space, so having limited it can not increase joint number very high, can fundamentally improve its steepness and increase the filter joint number, so this kind structure is not very good yet.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, proposed to organize the filter of structure based on the resonator of novel microstrip line construction and with it, its resonator adopts single lap or the twofold zonary structure that comprises a breach, make it have that to insert loss little, band is outer to suppress big, advantages such as transition band is precipitous, and the filter construction of organizing structure simultaneously is simple and direct, and overall dimensions is little.
The present invention proposes a kind of mini strip line resonator, it is characterized in that, by two endless belt, its end is connected and constitutes the single lap zonary structure, and one of them endless belt comprises a breach, and the end that two endless belt are connected is a blind end, and the other end is an openend.
Open end two endless belt can be equal height.
The present invention proposes another kind of mini strip line resonator, it is characterized in that, by three endless belt, its end is communicated with formation twofold zonary structure successively, wherein first endless belt comprises a breach, and second endless belt links to each other with first endless belt, and the 3rd endless belt links to each other with second endless belt, the end that first endless belt and second endless belt are connected is a blind end, and the other end is an openend.
Said three endless belt length can be identical in twos.
The present invention proposes a kind of filter of forming based on above-mentioned resonator structure, it is characterized in that, comprise a plurality of single lap endless belt resonators and the twofold endless belt resonator composition resonator battle array that are arranged in parallel successively, said first adopts twofold endless belt resonator with last resonator, and the input and output feeder line is connected with first end with the 3rd endless belt of last twofold endless belt resonator respectively.
The openend of adjacent resonators is towards can be identical, and the position of the breach that first endless belt of each resonator is comprised can be identical.
Effect of the present invention:
The present invention is under equal joint number condition, and at in-band insertion loss, attenuation outside a channel reach the performance index of external similar super conductive filter on the performances such as band edge steepness, and size is less than Open-loop shape super conductive filter.The present invention can make of superconductor, also can use other material.The present invention forms the resonator number of filter and can determine as required, each resonator parallel but up and down not necessarily the alignment.Therefore as long as adopt the filter of single lap or the design of twofold ring-band shape resonator structure all to belong to protection scope of the present invention.
Description of drawings
Fig. 1 is the topology layout schematic diagram of existing a kind of 8 joint Open-loop shape super conductive filters.
Fig. 2 is the response curve of existing 8 joint Open-loop shape super conductive filters.
Fig. 3 is the topology layout schematic diagram of a kind of single lap zonary structure resonator embodiment of the present invention.
Fig. 4 is the topology layout schematic diagram of a kind of twofold zonary structure resonator embodiment of the present invention.
Fig. 5 is the topology layout schematic diagram of a kind of super conductive filter embodiment of the present invention.
Fig. 6 is the response curve of this super conductive filter embodiment.
Fig. 7 is the topology layout schematic diagram of another kind of super conductive filter embodiment of the present invention.
Fig. 8 is the response curve of another super conductive filter embodiment.
Fig. 9 is the response curve of a kind of 14 joint super conductive filters of the present invention.
Embodiment
The mini strip line resonator of the present invention's design and microwave filter thereof reach accompanying drawing in conjunction with the embodiments and are described in detail as follows:
The topology layout of a kind of mini strip line resonator embodiment of the present invention's design as shown in Figure 3.Constitute the single lap endless belt by two long annulus connections.Among the figure, 31 is first endless belt, and it is made of two sections microstrip lines 311,312 in addition, forms a breach 313, and these two sections length with 311,312 can equate or not wait; Band is 314 in it; 32 is second endless belt, its in addition an end of 321 be connected with an end of the tyre 312 of first endless belt, in 322 with first endless belt in be connected with an end of 314.Distance in distance in the length of each endless belt and the endless belt between the tyre and two endless belt between the band can require according to the specific design of filter to determine.The microstrip line total length of whole single lap endless belt resonator is about half of filter center frequency corresponding wavelength.
The another kind of mini strip line resonator example structure layout of the present invention design is communicated with successively by three long annulus and constitutes the twofold endless belt as shown in Figure 4.Among the figure, 41 is first endless belt, and it is made of two sections microstrip lines 411,412 in addition, forms a breach 413, and band is 414 in it; 42 is second endless belt, and 43 is the 3rd endless belt, and wherein, the tyre 412 of first endless belt and the tyre 431 of the 3rd endless belt tyre 421 two ends by second endless belt are connected and to be two-fold stacked; In first endless belt with 414 with the 3rd endless belt in 432 by being with 422 two ends to be connected in second endless belt and to be two-fold stacked.Distance in the length of each endless belt and the endless belt between the tyre and the gap width between per two endless belt can require according to the specific design of filter to determine.The microstrip line total length of whole twofold endless belt resonator is about half of filter center frequency corresponding wavelength.
A kind of high temperature superconduction wave filter example structure layout of the present invention's design as shown in Figure 5.The centre frequency of filter is 830MHz, and relative bandwidth is 1.2%.White portion is the MgO substrate among the figure, is of a size of 17*28mm, and drawing oblique line partly is the superconductive micro-strip line, is placed between two parties on the MgO substrate.Input and output feeder line 50 and 55 width are 0.5mm, and corresponding to 50 ohm of input and output impedances, feeder line 50,55 length are 4.32mm, are 8.5mm apart from the distance at substrate top, separately and resonator contacted with it 51 and 54 couplings.51 to 54 is 4 the identical single lap zonary structure of dimensional structure resonators, and first endless belt is interior in twos, and gap position is relative, and the resonator openend is arranged in parallel up, is 4.3mm apart from the substrate distance from top.With the 2nd resonator 52 is the size that example illustrates resonator, whole single lap zonary structure resonator 52 micro belt line width everywhere is all 0.2mm, first endless belt 521, two sections microstrip lines 5211 in addition, 5212 length respectively are 7.1mm and 14.2mm, in to be with 5213 length be 21.05mm, distance is 0.2mm between its interior band and the tyre, the tyre 5221 long 21.5mm of second endless belt 522, in be with 5222 long 21.05mm, should in band and in addition between distance be 0.2mm, with being 0.3mm with the distance between 5222 in 5213 and second endless belt, the total length of whole microstrip line is about filter center frequency half of corresponding wavelength on this MgO substrate in first endless belt.Distance L 1 between each mini strip line resonator, L2, L3 are followed successively by 0.6mm, 0.82mm, 0.6mm.The present invention can also be easy to go out the higher filter of joint number with this structural design.The present invention can also use LaAlO
3, other material such as Sapphire substrate.
Fig. 6 is the frequency response curve of this filter embodiment, and solid line 61 is a loss S21 curve among the figure, and dotted line 62 is a reflection loss S11 curve, and the passband reflection coefficient has reached-18dB, and band edge steepness both sides have all reached about 2dB/MHz.Increase filter more more piece count under the situation of resonator, band edge can be more precipitous, band is outer to suppress better.
The another kind of high temperature superconduction wave filter example structure layout of the present invention's design as shown in Figure 7.The centre frequency of filter is 830MHz, and relative bandwidth is 1.2%.White portion is the MgO substrate among the figure, is of a size of 20*30mm, and drawing oblique line partly is the superconductive micro-strip line, is placed between two parties on the MgO substrate.Input and output feeder line 70 and 77 width are 0.5mm, and corresponding to 50 ohm of input and output impedances, feeder line length is 2.7mm, separately and resonator 7l contacted with it and 76 couplings.71 to 76 is 6 mini strip line resonators, and first endless belt is interior in twos, and gap position is relative, and the resonator openend is arranged in parallel up, is 2.4mm apart from the substrate distance from top.Wherein 72 to 75 4 resonators are single lap zonary structure resonator, its dimensional structure is identical, with the 4th resonator 74 is the size that example illustrates single lap zonary structure resonator, whole single lap zonary structure resonator 74 micro belt line width everywhere is all 0.2mm, first endless belt 741, two sections microstrip lines 7411 in addition, 7412 length respectively are 7.1mm and 14.2mm, in to be with 7413 length be 21.1mm, should in band and in addition between distance be 0.2mm, the tyre 7421 long 21.5mm of second endless belt 742, in be with 7422 long 21.1mm, should in band and in addition between distance be 0.2mm, with being 0.3mm with the distance between 7422 in 7413 and second endless belt, the total length of whole microstrip line is about filter center frequency half of corresponding wavelength on this MgO substrate in first endless belt.Resonator 71 and 76 is a twofold zonary structure resonator, and its dimensional structure is identical, is that example illustrates its size with 71.Whole twofold zonary structure resonator 7l micro belt line width everywhere is all 0.2mm, the first endless belt 7ll, two sections microstrip lines 7111 in addition, 7112 length respectively are 7.1mm and 14.2mm, in to be with 7113 length be 21.1mm, should in band and in addition between distance be 0.2mm, the tyre 7131 long 12.7mm of the 3rd endless belt 713, in be with 7132 long 12.3mm, should in band and in addition between distance be 0.2mm, be 0.3mm with the distance between the tyre 7121 of 7113 and second endless belt in first endless belt, with also being 0.3mm with the distance between 7122 in 7132 and second endless belt, be 0.2mm with the distance between 7122 and in addition 7121 in second endless belt 712 in the 3rd endless belt.The total length of whole microstrip line is about filter center frequency half of corresponding wavelength on this MgO substrate.Distance L 1 between each mini strip line resonator, L2, L3, L4, L5 are followed successively by 0.525mm, 0.675mm, 1.0mm, 0.675mm, 0.525mm.The present invention can be easy to design the higher filter of joint number with this structure.The present invention can also use LaAlO
3, other material such as Sapphire substrate.
Fig. 8 is the frequency response curve of this filter embodiment, and solid line 81 is a loss S21 curve among the figure, and dotted line 82 is a reflection loss S11 curve, and the passband reflection coefficient has reached-20dB, and band edge steepness both sides have all reached about 4dB/MHz.Increase filter more more piece count under the situation of resonator, band edge can be more precipitous, band is outer to suppress better.
The present invention is 830MHz according to the centre frequency of Fig. 7 example structure design, and relative bandwidth is that 1.2% filter can be accomplished 14 joints, and its size has only 40*30mm.The frequency response curve of this filter as shown in Figure 9, solid line 91 is a loss S21 curve among the figure, dotted line 92 is a reflection loss S11 curve, the passband reflection coefficient has reached-18dB, the both sides steepness has all reached 35dB/MHz, attenuation outside a channel is greater than 70dB.
Claims (7)
1, a kind of mini strip line resonator is characterized in that, by two endless belt, its end is connected and constitutes the single lap zonary structure, and one of them endless belt comprises a breach, and the end that two endless belt are connected is a blind end, and the other end is an openend.
2, mini strip line resonator as claimed in claim 1 is characterized in that, said open end two endless belt are equal height.
3, a kind of mini strip line resonator, it is characterized in that, by three endless belt, its end is communicated with formation twofold zonary structure successively, wherein first endless belt comprises a breach, and second endless belt links to each other with first endless belt, and the 3rd endless belt links to each other with second endless belt, the end that first endless belt and second endless belt are connected is a blind end, and the other end is an openend.
4, mini strip line resonator as claimed in claim 3 is characterized in that, said three endless belt length are identical in twos.
5, a kind of filter of forming based on the mini strip line resonator structure, it is characterized in that, comprise a plurality of single lap endless belt resonators and the twofold endless belt resonator composition resonator battle array that are arranged in parallel successively, said first adopts twofold endless belt resonator with last resonator, and the input and output feeder line is connected with first end with the 3rd endless belt of last twofold endless belt resonator respectively.
6, the filter of forming based on the mini strip line resonator structure as claimed in claim 5 is characterized in that the openend of adjacent mini strip line resonator is towards identical.
7, the filter of forming based on the mini strip line resonator structure as claimed in claim 5 is characterized in that the position of the breach that first endless belt of each resonator is comprised is identical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02155606 CN1252859C (en) | 2002-12-13 | 2002-12-13 | Microstrip line resonator and its microwave filter |
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| CN 02155606 CN1252859C (en) | 2002-12-13 | 2002-12-13 | Microstrip line resonator and its microwave filter |
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| CN1507107A CN1507107A (en) | 2004-06-23 |
| CN1252859C true CN1252859C (en) | 2006-04-19 |
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Granted publication date: 20060419 Termination date: 20211213 |