CN104091986B - Plane lossy filter of hybrid structure - Google Patents
Plane lossy filter of hybrid structure Download PDFInfo
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- CN104091986B CN104091986B CN201410365992.8A CN201410365992A CN104091986B CN 104091986 B CN104091986 B CN 104091986B CN 201410365992 A CN201410365992 A CN 201410365992A CN 104091986 B CN104091986 B CN 104091986B
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Abstract
The invention discloses a plane lossy filter of a hybrid structure. A micro-strip resonator and a substrate integrated waveguide resonator which are in bilateral symmetry are arranged, an input-output micro-strip line is respectively connected to the micro-strip resonator and the substrate integrated waveguide resonator through a first input-output micro-strip connecting line and a second input-output micro-strip connecting line, and the micro-strip resonator and the substrate integrated waveguide resonator are connected with an output micro-strip line of the lossy filter through the first input-output micro-strip connecting line and the second input-output micro-strip connecting line; the micro-strip resonator, the first input-output micro-strip connecting line, the second input-output micro-strip connecting line and the input-output micro-strip line are all printed on a dielectric substrate; the substrate integrated waveguide resonator is composed of substrate integrated waveguide earthing holes in the dielectric substrate and copper with which the upper portion and the lower portion of the dielectric substrate are covered. The plane lossy filter is easy to machine and low in cost, is of a plane structure, free of cross resistive coupling and is easy to implement.
Description
Technical field
The invention belongs to microwave has consumption wave filter technology field, more particularly, to a kind of substrate integrated waveguide technology and microstrip line
The plane of technology phase mixing has consumption wave filter.
Background technology
With developing rapidly of Modern wireless communication cause, high performance microwave wave filter is widely used in broadband communications system
Among system, particularly in telecommunication satellite, land station, the occasion such as wireless base station is widely used.Consumption wave filter is had to make
For one kind of high performance microwave wave filter, will increasingly be taken seriously.In the design process of microwave filter, designer's meeting
Find that the realization of a high performance filter generally requires the microwave resonator of high q value.Once the material of resonator and shape are true
After fixed, the q value of this resonator is just restrained.In order to improve q value, designer must increase the size of resonator, and this also leads
Cause the increase of filter size and weight.There is consumption wave filter still can provide height while effectively reducing resonator q value
The passband response of performance.Particularly when the interfering frequency substantial increase that electromagnetic environment is increasingly complicated and spectrum congestion leads to, have
The advantage of consumption wave filter will be apparent from.Due to its flat with internal characteristic and precipitous sideband characteristic, control can be effectively played
Useful signal processed, suppression harmful interference signal, the effect of support multichannel communication.There is the loss that consumption wave filter introduces can pass through
To mend there being consumption filter front end to increase low gain low-noise amplifier (low gain lna, low noise amplifier)
Repay.
Root according to research reports, has the consumption common way of realization of wave filter can classify as three kinds: 1. nonplanar structure, for example
Consumption wave filter had based on coaxial cavity resonator, this class formation has consumption performance of filter preferably, but volume and weight all than
Larger；2. planar microstrip structure, the consumption wave filter that has of this class formation generally has crossover resistance coupling, and crossover resistance couples
Cannot fully achieve in some cases；3. the plane of mixing and nonplanar structure, such have consumption performance of filter preferably, but
Volume is still larger with weight.Therefore, planar structure has consumption wave filter to have important using value.
At present, both at home and abroad to there being consumption wave filter to carry out a series of research work, and some achievements are achieved.But, report
The road consumption wave filter that has out is generally faced with following some defects:
(1) consumption wave filter is had much to adopt cavity body structure to realize, volume big weight weight, it is not easy to system compact and collection
Become.
(2) part has consumption wave filter to adopt planar microstrip structure, and such have consumption wave filter typically all to have crossover resistance
Coupling, crossover resistance is coupling in some application occasions and is difficult to realize.And planar microstrip structure has consumption wave filter generally to utilize
Some resistance elements, to realize the change of micro-strip resonantor q value, require to introduced resistance element harsh, are unfavorable for reality
Existing.
(3) partly there is the mixed structure that consumption wave filter is combined with planar microstrip structure using nonplanar cavity body structure,
The consumption wave filter that has of this kind of implementation has consumption wave filter compared to traditional cavity body structure, volume and weight has and necessarily changes
Kind, but also it is unable to reach optimum.
For there being tradition consumption wave filter volume and weight problem bigger than normal, have some documents at present and propose using non-homogeneous
Q value resonator has consumption wave filter to realize high-performance low weight.According to " a.c.guyette；i.c.hunter；and
r.d.pollard；the design of microwave bandpass filters using resonators with
nonuniform q,ieee trans.microw.theory & tech.,pp.3914-3922.november2006,54,
(11) analysis in ", constituted using micro-strip resonantor has consumption wave filter completely.This method is by embedding resistive element
To reduce resonator q value to inside micro-strip resonantor, to be simultaneously introduced crossover resistance coupling.The shortcoming of this method is to constitute
The maximum q value having consumption filter resonator is mainly controlled by micro-strip dielectric-slab, leads to the maximum q value of resonator low, has consumption filter
The insertion loss of ripple device increases further.And crossover resistance to be coupling in some occasions relatively difficult to achieve.Another utilizes non-
The method that uniformly q value resonator is realized having consumption wave filter is according to " m.meng；i.c.hunter；and j.d.rhodes；the
design of parallel connected filter networks with nonuniform resonators,ieee
Trans.microw.theory ＆ tech., pp.372-381.january2013,61, (1), " structure that proposed, there is consumption
The realization of wave filter is to be realized based on the mixed structure that coaxial cavity resonator and micro-strip resonantor combine, and two of which is same
Axocoel body sub-network in series 1, two micro-strip resonantors sub-network 2 in series, sub-network 1 and sub-network 2 is in parallel is formed
Non-homogeneous q value has consumption wave filter.Regulation during this method is realized is very loaded down with trivial details, and have the weight of consumption wave filter also than
Larger.
Either commercial Application or integrated needs, the especially demand of mobile terminal and satellite communication system, all
It is badly in need of that a kind of design is simple, high-performance, planar structure have consumption wave filter.
Content of the invention
The purpose of the embodiment of the present invention is to provide a kind of plane of mixed structure to have consumption wave filter it is intended to solve existing
With the presence of the complex structure of consumption wave filter, the larger problem of relatively costly, relative bandwidth.
The embodiment of the present invention is achieved in that a kind of plane of mixed structure has consumption wave filter, comprising: metal floor,
Medium substrate, the first input and output micro-strip connecting line, input and output microstrip line, the second input and output micro-strip connecting line, resonator；
Two symmetrical micro-strip resonantors of setting and substrate integration wave-guide resonator, it is defeated that input and output microstrip line passes through the first input
Go out micro-strip connecting line, the second input and output micro-strip connecting line is connected respectively to micro-strip resonantor and substrate integration wave-guide resonator
On, micro-strip resonantor and substrate integration wave-guide resonator pass through the first input and output micro-strip connecting line, the second input and output respectively
Micro-strip connecting line is connected with the output microstrip line having consumption wave filter；Micro-strip resonantor, the first input and output micro-strip connecting line, second
Input and output micro-strip connecting line, input and output microstrip line are all printed on medium substrate, and substrate integration wave-guide resonator is by being situated between
Substrate integration wave-guide ground hole on matter substrate and medium substrate upper and lower cover copper constitute.
Further, micro-strip resonantor q value is 278, and the q value of substrate integration wave-guide resonator is 515；Substrate integration wave-guide is humorous
Shake device and micro-strip resonantor constitutes non-homogeneous q value and has to consume wave filter and belong to plane and have consumption filter construction.
Further, the dielectric board material of micro-strip resonantor is rt/duroid5880, and relative dielectric constant is 2.2, dielectric-slab
Thickness is 0.787mm, and covering copper thickness is 0.018mm, and loss angle tangent is 0.0009.
Further, micro-strip resonantor adopts half-wave resonator.
Further, two symmetrical micro-strip resonantors form low q value sub-network, two substrate collection by slot-coupled
Become waveguide resonator to couple by opening and form high q value sub-network.
Further, high q value sub-network and low q value sub-network are placed in parallel composition and have consumption FL-network.
The plane of the mixed structure that the present invention provides has consumption wave filter, using substrate integrated wave guide structure and micro-strip resonantor
The mixed structure that structure combines, be a whole plane have consumption wave filter；There is consumption filter based on what non-homogeneous q value resonator was constituted
Ripple device, wherein high q value resonator is substrate integration wave-guide resonator, and processing is simple, with low cost；Because substrate integration wave-guide is humorous
Shake device q value between micro-strip resonantor and cavity resonator, enables the q that micro-strip resonantor and cavity resonator are not realized
Value；The consumption wave filter that has of the present invention belongs to planar structure, no crossover resistance coupling, it is easy to accomplish；Consumption wave filter is had to have very
Narrow bandwidth, in a particular embodiment of the present invention, operating center frequency is 1.984ghz, carries a width of 25mhz, and relative bandwidth is only
Have 1.26%, have consumption wave filter relative bandwidth much smaller than the overwhelming majority of report.The present invention can be carried out certainly according to the actual requirements
Adapt to improve, consumption wave filter work frequency has been adjusted by change micro-strip resonantor length, substrate integration wave-guide resonator size
Section；By changing the link position of input and output and resonator, change outside q value, by changing the seam between micro-strip resonantor
Gap, and change openings of sizes between substrate integration wave-guide resonator, change the coupling between resonator；Thus meeting different
Application demand, designs simple and flexible.
Brief description
Fig. 1 is that the plane of mixed structure provided in an embodiment of the present invention has consumption filter construction schematic diagram；
In figure: 1, metal floor；2nd, medium substrate；3rd, micro-strip half-wave resonator；4th, the first input and output micro-strip connects
Line；5th, input and output microstrip line；6th, the second input and output micro-strip connecting line；7th, substrate integration wave-guide resonator；8th, substrate is integrated
Waveguide ground hole；
Fig. 2 is that the plane of mixed structure provided in an embodiment of the present invention has the side view consuming wave filter；
Fig. 3 is insertion loss provided in an embodiment of the present invention and return loss simulation result figure；
In figure: s21It is insertion loss simulation result；s11It is return loss simulation result；
Fig. 4 is insertion loss provided in an embodiment of the present invention and return loss measured result figure；
In figure: s21It is insertion loss measured result；s11It is return loss measured result；
Fig. 5 is band external characteristics emulation provided in an embodiment of the present invention and measured result figure；
In figure: dotted line is band external characteristics simulation result；Solid line is band external characteristics measured result；
Fig. 6 is that the plane of mixed structure provided in an embodiment of the present invention has the scale diagrams consuming filter embodiment；
Fig. 7 be high q value sub-network in the embodiment of the present invention, low q value sub-network, be integrated with consume wave filter transmission characteristic imitate
True result figure；
In figure: dotted line is high q value sub-network transmission characteristic；Chain-dotted line is low q value sub-network transmission characteristic；Solid line is overall
There is consumption filter transfer characteristic；
Fig. 8 is that the embodiment of the present invention is corresponding consumption wave filter coupling matrix.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to
Limit the present invention.
Below in conjunction with the accompanying drawings and specific embodiment is further described to the application principle of the present invention.
As depicted in figs. 1 and 2, the plane of the mixed structure of the embodiment of the present invention has consumption wave filter mainly by metal floor
1st, medium substrate 2, micro-strip half-wave resonator 3, the first input and output micro-strip connecting line 4, input and output microstrip line 5, second are defeated
Enter to export micro-strip connecting line 6, substrate integration wave-guide resonator 7, substrate integration wave-guide ground hole 8 form；
Metal floor 1 is arranged on the bottom surface of medium substrate 2, and the input and output microstrip line 5 having consumption band filter passes through the
One input and output micro-strip connecting line 4, the second input and output micro-strip connecting line 6 is connected respectively to micro-strip resonantor 3 and substrate is integrated
On waveguide resonator 7, micro-strip resonantor 3 and substrate integration wave-guide resonator 7 pass through the first input and output micro-strip connecting line respectively
4th, the second input and output micro-strip connecting line 6 is connected with the input and output microstrip line 5 having consumption wave filter；Micro-strip resonantor 3, first is defeated
Enter to export micro-strip connecting line 4, the second input and output micro-strip connecting line 6, input and output microstrip line 5 are all printed on medium substrate 2,
Substrate integration wave-guide resonator 7 is to cover copper by the substrate integration wave-guide ground hole 8 on medium substrate 2 and medium substrate about 2
Constitute, therefore the present invention's has consumption wave filter generally planar structure, and symmetrical.
The micro-strip resonantor 3 of the present invention is half-wave resonator, and left and right two micro-strip resonantor is symmetrical；The present invention's
The location interval of metallized substrate integrated waveguide ground hole 8 is not had to be referred to as in two substrate integration wave-guide resonator 7 joining parts
Opening.
Two symmetrical micro-strip resonantors 3 form low q value sub-network by slot-coupled.
Two substrate integration wave-guide resonators 7 are coupled by opening and form high q value sub-network.
High q value sub-network and low q value sub-network are placed in parallel composition and have consumption FL-network.
It is defeated that the input and output microstrip line having consumption wave filter passes through first input and output micro-strip connecting line the 4, second input respectively
Go out micro-strip connecting line 6 to be connected in height q value sub-network, be formed with two paths of consumption wave filter.
Adjust the first input and output micro-strip connecting line 4, the second input and output micro-strip connecting line 6 and two height q value subnets
The link position of network, can adjust input and output coupling so that the present invention is functional.
To there is suitable opening between substrate integration wave-guide resonator 7, form suitable coupling.
Gap between micro-strip resonantor 3 suitably will form suitable coupling.
Two are placed in parallel sub-network and will have suitable connection, and two network paths are collectively forming high-performance consumption wave filter
Compound path.
As shown in figure 1, the substrate integration wave-guide resonator 7 having in consumption wave filter of the present invention is with respect to micro-strip resonantor 3
Speech belongs to high q value resonator, and constituting non-homogeneous q value using substrate integration wave-guide resonator 7 and micro-strip resonantor 3 has consumption wave filter
Belonging to plane has consumption filter construction, because different q values are realized by different structure, so compare microstrip structure plane having
Consumption wave filter, it is advantageous that: 1. couple without crossover resistance；2. the resistive unit of the q value of micro-strip resonantor need not be changed
Part.
The q value of micro-band resonance depends mainly on the size of the dielectric board material constituting micro-strip resonantor and micro-strip resonantor itself
Shape, when dielectric board material and micro-strip resonantor shape determine, the q value of micro-strip resonantor is also restrained therewith.The present invention
Middle dielectric board material is rt/duroid5880, and relative dielectric constant is 2.2, and medium plate thickness is 0.787mm, covers copper thick
Spend for 0.018mm, loss angle tangent is 0.0009.Micro-strip resonantor q value in the present invention is 278, substrate integration wave-guide resonance
The q value of device is 515.
In a particular embodiment of the present invention, as Fig. 6, wherein l1=65.7mm, l2=70.8mm, l3=20.4mm, l4=
30.4mm, l5=30.4mm, l6=16mm, l7=10.7mm, l8=24.7mm, l9=10mm, w0=2.3mm, w1=2.3mm, w2
=2mm, r=1mm, d=1.35mm.
As Fig. 6, input microstrip line 5 therein is by the second input and output micro-strip connecting line 6 and substrate integration wave-guide resonance
Device 7 is connected, and after the opening coupling between substrate integration wave-guide resonance 7, more logical second input and output microstrip line 6 is micro- with output
Band wire 5 is connected, and is formed with a path of consumption wave filter with this.Because substrate integration wave-guide resonator 7 is with respect to micro-band resonance
There is for device 3 higher q value, therefore this path is referred to as high q value path, as have consumption wave filter high q value sub-network.Individually
The response that high q value sub-network is formed is as shown by a dashed line in fig 7.Input microstrip line 5 passes through the first input and output micro-strip connecting line 4
It is connected with micro-strip resonantor 3, two symmetrical micro-strip resonantor 3 warps after slot-coupled transmission energy are inputted by first
Output microstrip line 4 is connected with output microstrip line 5, is formed with an other path of consumption wave filter.This path is referred to as low q value and leads to
, as there is consumption wave filter low q value sub-network on road.The response that individually low q value sub-network is formed is as shown in Fig. 7 chain lines.High q
Value sub-network and low q value sub-network share input and output microstrip line 5 it is possible to be formed with consumption wave filter Whole Response, overall
Shown in solid in response such as Fig. 7.
As Fig. 7, the response that high q value sub-network is formed has peak value at two, the response of low q value sub-network formation in passband edge
There is at bandpass center minimum, the feature that Out-of-band rejection is slowly increased that is lost, high q value sub-network each idiomorphism with low q value sub-network
The response becoming is just complementary, has defined consumption wave filter Whole Response, and Whole Response has two transmission zeros, two outside band
Transmission zero has enhanced consumption wave filter Out-of-band rejection, and the passband of Whole Response is very flat, no ripple in band, Whole Response
Squareness factor is preferable；
The all resonators constituting a wave filter all have identical q value, then the band internal loss that this wave filter increases
Formula (1) approximate representation can be used.
Wherein δ il represents the band internal loss of increase, tg(ω) it is group delay, quFor constituting the no-load of the resonator of wave filter
Q value.When group delay than larger when, insertion loss will substantially increase, this can lead to filter passband edge rounder and more smooth,
The outer maximum suppression of band reduces.Particularly when the wave filter of design is narrow band filter, this impact more highlights, because narrow
In band filter, group delay is inversely proportional to bandwidth, and narrower bandwidth will correspond to higher group delay.When non-using the present invention
Uniformly during q value structure, the q value due to constituting the resonator having consumption wave filter is no longer equal, then formula (1) will no longer be set up,
The loss increasing in band greatly reduces to the dependence of group delay, the embodiment of the present invention have consumption filter bandwidht very narrow, but insert
Enter loss and still only have 2.5db, and flat in carrying, and Out-of-band rejection is good, that is, have the squareness factor of consumption wave filter preferable.
The insertion loss and return loss of the embodiment of the present invention is emulated and is measured, emulation tool is adopted 3 D electromagnetic
The hfss15.0 of simulation software, test instrunment is n5230a vector network analyzer, and Fig. 3 is insertion loss and return loss emulation
As a result, Fig. 4 is the measured result of insertion loss and return loss；From measured result Fig. 4, the work frequency of the embodiment of the present invention
Rate is 1.984ghz, carries a width of 25mhz, and relative bandwidth only has 1.26%, and insertion loss is 2.5db.
The band external characteristics of the embodiment of the present invention is emulated and is measured, Fig. 5 is given a simulation result and measured result
Correlation curve.Wherein dotted line is field simulation curve, and solid line is measured curve.s11For return loss plot, s21Bent for transmission coefficient
Line.There is figure visible, the Out-of-band rejection that this has consumption wave filter within 4.3ghz is more than 19.5db.And emulate and measured result kiss
It is very good to close, and has absolutely proved the feasibility of present invention design.
Compared with prior art, the present invention has the advantage that
1. the mixed structure that the present invention is combined with micro-strip resonantor structure using substrate integrated wave guide structure, is a complete
Plane have consumption wave filter.
2. the present invention is that have consumption wave filter based on what non-homogeneous q value resonator was constituted, and wherein high q value resonator is substrate collection
Become waveguide resonator, processing is simple, with low cost.
3. the present invention adopt substrate integration wave-guide resonator q value between micro-strip resonantor and cavity resonator, energy
Realize the q value that micro-strip resonantor and cavity resonator are not realized.
4. the consumption wave filter that has of the present invention belongs to planar structure, no crossover resistance coupling, it is easy to accomplish.
5. the consumption wave filter that has of the present invention has very narrow bandwidth, in a particular embodiment of the present invention, work centre frequency
Rate is 1.984ghz, carries a width of 25mhz, and relative bandwidth only has 1.26%, has consumption filtering much smaller than the overwhelming majority of prior art
Device relative bandwidth.
6. the present invention can carry out adaptive impovement according to the actual requirements, and a kind of adaptive impovement method is described as follows: Fig. 8 to
Go out that the embodiment of the present invention is corresponding consumption electric-wave filter matrix.It is assumed that the to be designed consumption filter centre frequency that has is f0, bandwidth
For bw.This matrix is 6 × 6 matrixes, the imaginary part j δ of diagonal entryiiCharacterize each resonator respective no-load q value, by δii=
f0/(bw×qu), the q value constituting each resonator having consumption wave filter can be calculated.By changing the length of micro-strip resonantor 3
Degree, the size of substrate integration wave-guide resonator 7 consume wave filter to make its operating frequency to be f to have adjusted0.M in matrixij、msi、
mliIt is all real number, wherein mijRepresent the coupling between resonator, msi、mliRepresent the coupling between input, output and resonator respectively
Close.According to " j.s.hong；m.j.lancaster；microstrip filters for rf/microwave
Applications, john wiley ＆ sons, 2004, " by adjusting the first input and output connecting line 4 and micro-strip resonantor 3
Link position, the second input and output micro-strip connecting line and substrate integration wave-guide resonator 7 link position so that input and output
Coupling meets the m in coupling matrix in Fig. 8si、mli.By adjusting the gap between micro-strip resonantor, adjustment substrate integration wave-guide
Openings of sizes between resonator is so that the coupling between resonator meets the m in coupling matrix in Fig. 8ij.Having shown in as Fig. 8
Consumption electric-wave filter matrix in element respectively with recited above coupling equal when, a operating frequency be f0, having with a width of bw
Consumption wave filter is just devised.This design simple and flexible.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (1)
1. a kind of plane of mixed structure has consumption wave filter, comprising: metal floor, medium substrate, the first input and output micro-strip are even
Wiring, input and output microstrip line, the second input and output micro-strip connecting line, resonator；It is characterized in that, setting two is symmetrical
Micro-strip resonantor and substrate integration wave-guide resonator, input and output microstrip line pass through the first input and output micro-strip connecting line, the
Two input and output micro-strip connecting lines are connected respectively on micro-strip resonantor and substrate integration wave-guide resonator, micro-strip resonantor and base
Piece integrated wave guide resonance device passes through the first input and output micro-strip connecting line, the second input and output micro-strip connecting line respectively and has consumption filter
The output microstrip line of ripple device is connected；Micro-strip resonantor, the first input and output micro-strip connecting line, the second input and output micro-strip connect
Line, input and output microstrip line are printed on medium substrate, and substrate integration wave-guide resonator is integrated by the substrate on medium substrate
Waveguide ground hole and medium substrate upper and lower cover copper constitute；
Micro-strip resonantor q value is 278, and the q value of substrate integration wave-guide resonator is 515；Substrate integration wave-guide resonator and micro-strip
The resonator non-homogeneous q value of composition has consumption wave filter to belong to plane and has consumption filter construction；
The dielectric board material of micro-strip resonantor is rt/duroid5880, and relative dielectric constant is 2.2, and medium plate thickness is
0.787mm, covering copper thickness is 0.018mm, and loss angle tangent is 0.0009；
Micro-strip resonantor adopts half-wave resonator；
Input and output microstrip line is connected with micro-band resonance by the first input and output micro-strip connecting line, and two micro-strip resonantors pass through
Slot-coupled, forms low q value path, i.e. low q value sub-network, input and output microstrip line passes through the second input and output micro-strip connecting line
It is connected with substrate integration wave-guide resonator, two substrate integration wave-guide resonators are coupled by opening, form high q value path, that is,
High q value sub-network；
Low q value sub-network shares input and output microstrip line with high q value sub-network, and that is, high q value sub-network is parallel with low q value sub-network
Connect formation to be integrated with consuming wave filter.
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| CN106785271B (en) * | 2016-12-29 | 2019-05-07 | 南京理工大学 | Single layer plane double-passband filter based on 1/8th mould substrate integration wave-guides |
| CN107611540B (en) * | 2017-09-07 | 2019-04-23 | 西安电子科技大学 | One kind being mixed with consumption duplexer |
| CN109301412B (en) * | 2018-10-24 | 2024-04-09 | 江南大学 | Three-passband filter based on hybrid substrate integrated waveguide structure |
| CN115020952B (en) * | 2022-08-08 | 2023-01-17 | 电子科技大学 | Miniaturized plane matching load |
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