CN107887676A - One kind miniaturization balance double-passband filter - Google Patents
One kind miniaturization balance double-passband filter Download PDFInfo
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- CN107887676A CN107887676A CN201711021166.1A CN201711021166A CN107887676A CN 107887676 A CN107887676 A CN 107887676A CN 201711021166 A CN201711021166 A CN 201711021166A CN 107887676 A CN107887676 A CN 107887676A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The invention discloses a kind of topological structure of Novel balance wave filter, i.e., the miniaturization balance double-passband filter based on symmetry characteristic.The wave filter is characterised by：The filter shape is combined by two symmetrical minor matters loading resonators, on the premise of guarantee is functional, also ensures the compactedness of filter construction；The wave filter of the new structure is that Even odd mode method motivates differential mode common mode special type using strange mould Two-port netwerk and even mould Two-port netwerk, it is ensured that the pass-band performance and centre frequency of microstrip filter；Filter uses four port organization networks, shares four feeder lines, signal input and signal output are required to a pair of ports to realize, respectively positioned at the left side of structure and right side；Designed wave filter utilizes and loads resonator coupled structure suppression common mode characteristic, it is ensured that the practicality of the wave filter.The invention provides a kind of topological diagram of new balance double-passband filter, the structure realizes miniaturization, and has good performance characteristics.
Description
Technical field：
The present invention relates to field of microwave communication, is that one kind is compact-sized, it is simple to make, and available for the small of microwave circuit
Typeization balances double-passband filter.
Background technology：
In microwave communication, wave filter is most basic and most important device in communication system circuit, its performance indications
Directly affect the performance indications of communication system.Wave filter have the function that in whole communication system it is irreplaceable, as one
Kind frequency selective device, its basic function is the signal for suppressing unwanted frequency range, and passes through the frequency band signals of needs.Reason
The wave filter thought should be such a two-port network：It can be such that signal transmits completely in free transmission range, and in stopband model
He makes signal to transmit completely in enclosing.Wherein because the special construction of balancing circuitry being capable of common-mode noise fully in reduction system
Caused by influence, improve receiver signal to noise ratio, improve emitter efficiency.Therefore, need of the integrated circuit for balancing device
Asking can be huger.
At present, the design main method of balance filter be by single signal port bandpass filter and two barron structures this
Two parts are realized by cascade or parallel way connection.Although this mode can be good at realizing the property of balance filter
Can, but wave filter and balun are relatively more using electric capacity, inductance, space used is just relatively larger, that is to say, that Bu Nengyong
In integrated circuit.Therefore, the miniaturization of wave filter and the raising of performance will continue to be two big important topics.Microwave filter is small
The several method of type generally use：1st, the size of wave filter is reduced using high dielectric constant material.2nd, using multilayer technique (such as
LTCC the volume of wave filter) is reduced.3rd, wave filter etc. is designed using symmetrical structure.
The advantages of being easy to integrate with other microwave circuits due to micro-strip resonantor, turn into the heat of exploitation microwave device at present
Point.The symmetric form minor matters loading resonator used in the design is exactly one of realization rate, and its principle is：Utilize balancing filter
The symmetry characteristic of device, four port networks are reduced to two different two-port networks of boundary condition.Strange mould Two-port netwerk and even mould
Two-port netwerk acts on simultaneously when, original Electric Field Distribution can be changed, equivalent to two coupled resonatorses, with reference to the coupling knot in design
Structure, can be right by the gap changed between Two-port netwerk so as in the case where keeping resonant tank constant, reduce its structure
Stiffness of coupling is controlled, while is also beneficial to the regulation of dual-passband.By change the length of resonator structure and microstrip line come
Performance of filter is realized, it is simple in construction.Conventional micro-strip resonantor can be the forms such as circular, square, annular or broken line.
From the point of view of existing literature, the balance filter studied mainly includes:The LTCC, (filter of interdigital line coupled resonators
Ripple device) etc..
The content of the invention
In order to meet the needs of microwave circuit technology development, it is a primary object of the present invention to provide a kind of New Topological knot
The miniaturization balance double-passband filter of structure.
To achieve these goals, technical scheme used in the present invention is as follows：
Miniaturization balance double-passband filter, the wave filter have a pair of input signals port and a pair of output signal ends
Mouthful, it is characterised in that the filter shape is combined by two symmetrical minor matters loading resonators, functional in guarantee
On the premise of, also ensure filter construction compactedness.
The balance filter is that Even odd mode method motivates differential mode common mode spy using strange mould Two-port netwerk and even mould Two-port netwerk
Type, it is ensured that the pass-band performance and centre frequency of microstrip filter.
The miniaturization balance double-passband filter uses four port organization networks, four feeder lines is shared, such as Fig. 1 shadow parts
Shown in point, signal input and signal output are required to a pair of ports to realize, respectively positioned at the left side of structure and right side.And use
The mode of direct feed is connected with resonator inside, can reduce insertion loss compared with coupling feed way, improve making precision.
And utilize and load resonator coupled structure suppression common mode characteristic, it is ensured that the practicality of the wave filter.
In the specific embodiment of the present invention, the minor matters loaded microstrip line and feeder line are copper foil.
The positive effect of the present invention is：The invention provides a kind of new balance filter topological structure, i.e.,
Miniaturization balance double-passband filter based on symmetry characteristic.Designed topological structure is processed into material object and it is surveyed
Amount, test show：The balance double-passband filter of the structure, possesses good performance characteristics.
Brief description of the drawings
Fig. 1 is the geometry schematic diagram that miniaturization provided by the invention balances double-passband filter.
Fig. 2 is the microstrip line scale-up version schematic diagram that miniaturization provided by the invention balances double-passband filter.
Fig. 3 is the differential-mode response figure of the present invention.
Fig. 4 is the common-mode response figure of the present invention.
Fig. 5 is the S21 response diagrams under the different coupling interval Ss 1 between two resonators of the present invention.
Fig. 6 is under the coupling line different in width W2 being connected in parity mode Two-port netwerk of the present invention with input/output port feeder line
S21 response diagrams.
Fig. 7 be the present invention lose for adjust performance of filter loading resonance portion under common-mode response figure.
Fig. 8 is the present invention for adjusting the loading resonance portion of performance of filter whether there is common-mode response under coupling line
Figure.
Embodiment
In order that the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further：
Fig. 1 is the geometry schematic diagram that novel miniaturization provided by the invention balances double-passband filter.The wave filter
Including：The strange coupled structure of mould Two-port netwerk 1；The even coupled structure of mould Two-port netwerk 2；For adjusting the loading resonance portion of performance of filter
3；1 is connected with 3,2 with 3 by microstrip line, and 1 is connected with 2 by resonator 3, beneficial to the regulation of dual-passband；Using four ends
Mouth structure network, four feeder lines 4 are shared, as shown in Fig. 1 dash areas, signal input and signal output are required to a pair of ports and come
Realize, respectively positioned at the left side of structure and right side.And it is connected by the way of direct feed with resonator inside.And utilize and add
Carry resonator coupled structure suppression common mode characteristic, it is ensured that the practicality of the wave filter.
The present invention proposes a kind of brand-new balance filter topological structure, proves that this topology is tied using Maxwell equation
Structure, for actual conditions, due to being difficult or can not theoretically being proved with Maxwell equation, can only using numerical method come
Prove, in academic and engineering frequently with method be using the high-frequency electromagnetic simulation software of commercialization carry out Electromagnetic Simulation to prove,
Optimization.
Commercial high-frequency electromagnetic simulation software has a variety of, and I optimizes using HFSS to the topological structure of proposition.
Sample is made in the structure of optimization again, to sample test, experimentally confirms the filter topology.
The actual size 30mm*20.9mm of new structure of the present invention；Feeder line width W3=2.8mm.Selection is emulated herein
The dielectric constant of medium substrate is 2.65, thickness 1mm.Fig. 2 illustrates for topological structure microstrip line.Each parameter size is (single
Position/mm) be：L1=19.4, L2=11.7, L3=2.25, L4=2.4, L5=10, L6=5.8, L7=3.45, L8=4.1,
L9=3.5, L10=3.5, L11=1, L12=2.35, L13=3.8, t=1.9, S1=0.6, S2=0.2, S3=0.5, S4
=0.3, LP=0.7, WP=1.2, W1=1.4, W2=0.2, W3=2.8, W4=0.6.Wherein, L2, L4 are the end of parity mode two
The length of mouth minor matters loading, W1 are the width of parity mode Two-port netwerk minor matters loading, and L3 is saved for brachyplast in parity mode Two-port netwerk and length
The distance between minor matters, L5, (t+W3+L6), L7 are that resonator is connected the length of part microstrip line with feeder line, and W2 is resonator
Be connected the width of part microstrip line with feeder line, and L8, L9, L10 are loading resonance portion micro-strip line length, and W4 is loading resonant structure
Point micro belt line width, LP, WP are respectively the length and width of the non-central loading minor matters of wave filter, L11 be parity mode Two-port netwerk with
The distance between resonance portion is loaded, and L12 is that the distance between non-central loading minor matters of wave filter, L13 are loaded inside resonance
It is respectively the length and width of feeder line 4 with W3, coupling distances of the S1 between symmetrical resonator, S2, S3 are parity mode Two-port netwerk
Coupling distance between long minor matters and resonator and feeder line connected component microstrip line, S4 are the coupling distance of loading resonance portion.
Each size of wave filter is described as follows：
1. two minor matters loading resonator structures are symmetrical, one of them size for being loaded directly into resonator is 19.4*
13.8mm, wherein the parity mode Two-port netwerk minor matters that one is long and the other is short loading width are 1.4mm, and length is respectively 11.7mm, 1mm.
2. two pairs of symmetrical input/output ports, i.e. feeder line width are 2.8mm, length 3.8mm, it is connected with feeder line
For feeder line loading structure by a width of 0.2mm, length is respectively 3.45mm, 10.7mm, 2.2mm, and 10mm minor matters loading is formed.
3. intermediate coupling structure resonator by it is a width of be 1.4mm, long is respectively 1.4mm, 3.5mm and a length of 3.5mm, a width of
0.6mm folding minor matters are formed.It is 7.3mm, a width of 0.6mm with the Coupled Line Length of Band that it is coupled.
4. being loaded in resonator by the minor matters protruded, its length is 0.7mm, width 1.2mm.
Due to using symmetrical structure, therefore using plane of symmetry above resonator structure in Fig. 2 as explanation object.With Fig. 2
Middle pore 5 is basic point (note：Pore 5 is only used as mark and used not in this structure design), there is an a length of L1 to the right,
A width of W1 rectangular microstrip line is as substrate；There is an a length of L4 upwards, a width of W1 rectangular microstrip line, be strange mould Two-port netwerk 1
In short loading minor matters；Apart from the short loading minor matters of strange mould Two-port netwerk to the right at L3 length, there is a upward a length of L2, it is a width of
W1 rectangular microstrip line, it is loading minor matters long in strange mould Two-port netwerk；Coupling distance on the right side of loading minor matters is grown in strange mould Two-port netwerk
To have a length of L5 of an above-below direction, a width of W2 rectangular microstrip line at S2；Grow in strange mould Two-port netwerk and coupled on the left of loading minor matters
Distance is has a length of (t+W3+L6) of an above-below direction, a width of W2 rectangular microstrip line at S2；Loading branch is grown in strange mould Two-port netwerk
Section left side coupling distance is to have an a length of L7 to the left, a width of W2 rectangular microstrip line at S2；Grow and load in strange mould Two-port netwerk
Coupling distance is a length of (2*S2+2*W2+W1) for having at S3 a left and right directions above minor matters, a width of W2 rectangular microstrip line；
Above substrate rectangular microstrip line (L2+S3+W2-t) place have an a length of L13, a width of W3 rectangular microstrip line is as defeated
Enter output feeder 4；There is structure 3 (coupling loading resonator) at the right side distance L11 of the long minor matters loading of strange mould Two-port netwerk, entirely
Structure 3 is a length of (2*L9+S4), a width of (L8+S4+W4).It is basic point (note with pore in Fig. 26：Pore 6 is not set in this structure
In meter, it is only used as mark and uses), there are an a length of L8, a width of W1 rectangular microstrip line upwards；In basic point 6 upwards at distance L8
There are an a length of L9 to the right, a width of W1 rectangular microstrip line；Grown apart from 6 upward L8 of basic point, to the right L9 strong points have one it is downward
A length of L10, a width of W4 rectangular microstrip line；Apart from basic point 6, distance is to have an a length of LP at L12 to the right, a width of WP's adds
Carry minor matters；There are a upward a length of L8, a width of W1 square in distance (2*L9+W4-L12-WP-2*W1) place on the right side of loading minor matters
Shaped microstrip line；In distance loading minor matters upward L8 length, (2*L9+W4-L12-WP-W1) strong point has to the left a length of to the right
L9, a width of W1 rectangular microstrip line；There is a downward a length of L10 at lateral extent (L8-LP) place in loading minor matters, a width of W4's
Rectangular microstrip line；In basic point 6, distance has a length of (2*L9+W4) to the right for (L8+S4) place upwards, and a width of W4 rectangle is micro-
Band line；There is the even mould Two-port netwerk of structure 2 at distance L11 to the right in structure 3, it is mirrored effect with strange mould Two-port netwerk 1, therefore no longer
Repeat.
It is starting point with origin (0,0), i.e. stain 5 ,+(or without) represent along X, Y-axis positive direction ,-represent and born along X, Y
Direction.At coordinate (0,0) place, there is the rectangular microstrip line of one (- W1, L1)；
At coordinate (0,0) place, there is the rectangular microstrip line of one (- L4, L1)；
At coordinate (0, W1+L3) place, there is the rectangular microstrip line of one (- W1-L2, W1)；
At coordinate (0,2*W1+L3+L11) place, there is the rectangular microstrip line of one (- W1-L8, W1)；
At coordinate (- W1-L8,2*W1+L3+L11) place, there is the rectangular microstrip line of one (- W1, L9)；
At coordinate (- W1-L8,2*W1+L3+L11+L9) place, there is the rectangle of one (L10 ,-W2) micro-
Band line；
At coordinate (- W1-L8,2*W1+L3+L11+2L9+S4) place, there is the rectangular microstrip line of one (L8+W1 ,-W1)；
At coordinate (- W1-L8,2*W1+L3+L11+L9+S4) place, there is the rectangular microstrip line of one (W1, L9)；
At coordinate (- W1-L8,2*W1+L3+L11+L9+S4) place, there is the rectangular microstrip line of one (L10, W2)；
At coordinate (0,3*W1+L3+L11+L12) place, there is the rectangular microstrip line of one (- W1-Lp, Wp)；
At coordinate (0,2*W1+L3+2*L11+2*L9+S4) place, there is the rectangular microstrip line of one (- W1-L2, W1)；
At coordinate (0, L1) place, there is the rectangular microstrip line of one (- L4 ,-W1)；
At coordinate (- W1-L2-S3-W2,2*W1+L3+S2+W2) place, there is the rectangular microstrip line of one (L5 ,-W2)；
At coordinate (- W1-L2-S3-W2, W1+L3-S2-W2) place, there is the rectangular microstrip of one (W2,2*W2+W1+2*S2)
Line；
At coordinate (t+L6-L2-S3, W1+L3-S2) place, there is the rectangular microstrip line of one (- W2-L6-W1-t ,-W2)；
At coordinate (t+L6-L2-S3, W1+L3-S2) place, there is the rectangular microstrip line of one (- W2 ,-L7)；
At coordinate (t+L6-L2-S3,3*W1+L3+2*L11+2*L9+S2+S4) place, there is the rectangle of one (- W2, L7) micro-
Band line；
At coordinate (- W1-L2-S3-W2,3*W1+L3+2*L11+2*L9+W2+S2+S4) place, there is (a W2+L6+W1+
T ,-W2) rectangular microstrip line；
At coordinate (- W1-L2-S3-W2,2*W1+L3+2*L11+2*L9-W2-S2+S4) place, there are (W2, a 2*W2+W1+
Rectangular microstrip line 2*S2)；
At coordinate (- W1-L2-S3-W2+L5,2*W1+L3+2*L11+2*L9-W2-S2+S4) place, have one (- L5, W2)
Rectangular microstrip line；
At coordinate (t+W1-L2-S3-W2, W1+L3-S2) place, there is the rectangular microstrip line of one (- W3 ,-W2-L13)；
At coordinate (t+W1-L2-S3-W2,3*W1+L3+2*L11+2L9+S2+S4) place, have one (- W3, W2+L13)
Rectangular microstrip line；Now, the figure to draw, around origin dextrorotation turnback, is obtained one newly as an entirety 1
Overall 2, then overall 2 are translated along X positive directions S1 distance.It now can be obtained by this wave filter overall structure figure
.
Fig. 3, Fig. 4 sets forth the differential-mode response figure and common-mode response figure of wave filter emulation and test.There is figure can
Know invention wave filter overall performance it is preferable：Simulation result is that the first passband central frequency is 2.5GHz, three dB bandwidth 380M,
Logical in-band insertion loss is 1.82dB；Second passband central frequency is 6GHz, three dB bandwidth 410M, and logical in-band insertion loss is
2.2dB；Common mode inhibition is more than 35dB.Test result is that the first passband central frequency is 2.5GHz, three dB bandwidth 350M, passband
Interior insertion loss is 3.21dB；Second passband central frequency is 5.9GHz, three dB bandwidth 390M, and logical in-band insertion loss is
3.9dB；Common mode inhibition is more than 40dB.
Fig. 5 is that novel miniaturization double-passband filter is humorous in two of symmetrical structure in the case where other parameters are constant
S21 response diagrams under the different coupling interval Ss 1 shaken between device.It can be seen that when coupling spacing is 0.6mm, S21 curves are more good
Good, passband is 380M or 410M；When coupling spacing is 0.2mm, the position of S21 curve transmission zero points is basically unchanged, but characteristic
Value has reduced, broadband increase；When coupling spacing is 1mm, the position of S21 curve transmission zero points is basically unchanged, but characteristic value
It increased, broadband reduces.Therefore, S1 mainly influences wave filter broadband.
Fig. 6 is that novel miniaturization pass filter is defeated with input in parity mode Two-port netwerk in the case that other specification is constant
S21 response diagrams under the coupling line different in width W2 that exit port feeder line is connected.As can be seen that when width is 0.2mm, S21 is bent
Line is more good, has obvious dual-passband, and passband is 380M or 410M；When width is 0.05mm, the transmission zero in left side is right
Move, right side transmission zero is basically unchanged, the increase of the first pass band width, and unstable, and the performance of the second passband is good, but bandwidth is same
Increase；When width is 0.35mm, the transmission zero on left side and right side moves to left.First pass band width increases, and unstable, and second
Pass band width reduces.Therefore, parity mode Two-port netwerk structure influences the passband filtering characteristic of wave filter.
Fig. 7 is that novel miniaturization balances double-passband filter in the case where other structures are constant, loses being total under structure 3
Mould response diagram.As can be seen that when having structure 3, common mode inhibition is more than 35dB, there is good common-mode rejection properties, can be effectively
Resist extraneous noise；When not having structure 3, common mode inhibition is too small, there is very poor common-mode rejection properties, is unsatisfactory for wave filter basic nature
It can require.Therefore, structure 3 can effective suppression common mode noise.
Fig. 8 is that novel miniaturization balances double-passband filter in the case of other structures are immutable, and structure 3 whether there is coupling
Common-mode response figure under line.As can be seen that when having coupling line, common mode inhibition is more than 35dB, there is good common-mode rejection properties；Not yet
When having coupling line, common mode inhibition is more than 25dB, and performance is apparently without good when having a coupling line.Therefore the coupling line energy added herein
Enough improve common mode rejection performance.
The main innovation point of the present invention is will must to load resonator structure with coupling line to apply to symmetry balancing filter
In the design of device, a kind of balance double-passband filter of good performance is designed.
2007, balance coupling line and Stepped Impedance conversion resonator is applied to the design of balance filter.Using flat
Four port networks are reduced to two different two-port networks of boundary condition by the symmetry characteristic of weighing apparatus wave filter.Strange mould Two-port netwerk
When being acted on even mould Two-port netwerk simultaneously, original Electric Field Distribution can be changed, equivalent to two coupled resonatorses, with reference in design
Coupled structure, so as in the case where keeping resonant tank constant, reduce its structure, by changing the gap between Two-port netwerk
Stiffness of coupling can be controlled, while be also beneficial to the regulation of dual-passband.By changing resonator structure and microstrip line
Length realizes performance of filter, simple in construction.Conventional micro-strip resonantor can be the forms such as circular, square, annular or broken line.
From the point of view of existing literature, the balance filter studied mainly includes:The LTCC, (filter of interdigital line coupled resonators
Ripple device) etc..
The present invention is a kind of new miniaturization balance double-passband filter, compact-sized, functional.
What is be shown and described above is general principle, principal character and the advantages of the present invention of the present invention.The skill of the industry
For art personnel it should be appreciated that the present invention is not limited to the above embodiments, described in above-described embodiment and specification is explanation
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent defines.
Claims (2)
1. one kind miniaturization balance double-passband filter, the wave filter have a pair of input signals port and a pair of output signal ends
Mouthful, it is characterised in that the filter shape is combined by two symmetrical minor matters loading resonators；Using strange mould Two-port netwerk
It is that Even odd mode method motivates differential mode common mode special type with even mould Two-port netwerk, it is ensured that the pass-band performance of microstrip filter and center
Frequency；Using four port organization networks, four feeder lines are shared；Signal is inputted and signal output is realized by a pair of ports, point
Not Wei Yu structure left side and right side；And be connected by the way of direct feed with resonator inside, while utilize and load resonance
Device coupled structure suppression common mode characteristic.
2. miniaturization balance double-passband filter according to claim 1, it is characterised in that：The minor matters loaded microstrip line
It is copper foil with feeder line material.
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| CN114665244A (en) * | 2022-04-24 | 2022-06-24 | 成都大学 | Microstrip filtering balun based on meander line type ring resonator |
| CN115425377A (en) * | 2022-09-29 | 2022-12-02 | 河南科技大学 | Double-passband balance filter based on square ring loading |
| CN116598738A (en) * | 2023-07-17 | 2023-08-15 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114665244A (en) * | 2022-04-24 | 2022-06-24 | 成都大学 | Microstrip filtering balun based on meander line type ring resonator |
| CN114665244B (en) * | 2022-04-24 | 2023-09-15 | 成都大学 | Microstrip filter balun based on serpentine type ring resonator |
| CN115425377A (en) * | 2022-09-29 | 2022-12-02 | 河南科技大学 | Double-passband balance filter based on square ring loading |
| CN115425377B (en) * | 2022-09-29 | 2023-09-08 | 河南科技大学 | Double-passband balance filter based on loading of ring resonator |
| CN116598738A (en) * | 2023-07-17 | 2023-08-15 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
| CN116598738B (en) * | 2023-07-17 | 2023-10-13 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
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