CN106953146A - Based on four mould defects formula resonator three-passband filter - Google Patents
Based on four mould defects formula resonator three-passband filter Download PDFInfo
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- CN106953146A CN106953146A CN201710162720.1A CN201710162720A CN106953146A CN 106953146 A CN106953146 A CN 106953146A CN 201710162720 A CN201710162720 A CN 201710162720A CN 106953146 A CN106953146 A CN 106953146A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
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Abstract
The present invention disclose it is a kind of based on four mould defects formula resonator three-passband filter, including PCB dielectric-slabs, four mould defects ground formula resonator, two microstrip feed lines and micro-strip step electric impedance resonator.Four mould defects formula resonator include the first resonant element and four the second resonant elements；One end of four the second resonant elements connects four ends of the first resonant element respectively.The front end of two microstrip feed lines extends respectively into edge two ports of formation of PCB dielectric-slabs, and two microstrip feed lines are symmetrical on the first central axis, and the spacing between two microstrip feed line ends carries the feed structure of coupling close to formation source.Micro-strip step electric impedance resonator includes two the 3rd resonant elements and the 4th resonant element, and openend of two the 3rd resonant elements close to two ends of the first central axis respectively with the 4th resonant element is connected.Three-passband filter of the present invention can produce six transmission zeros, with higher passband selectivity and belt resistance inhibitor system.
Description
Technical field
The present invention relates to frequency microwave communication technical field, more particularly to it is a kind of based on four mould defects formula resonator three
Pass filter.
Background technology
In modern microwave communication system, bandpass filter (BPF) need to have good selectivity, and Out-of-band rejection degree is wide
Stopband and miniaturization structure.Although traditional multimode BPF based on loaded type resonator has preferable selectivity, deposit
In many parasitic passbands.Multimode resonator can produce multiple modes of resonance by single resonant body, therefore, humorous with multimode
The device that shakes design microwave device can effectively reduce device size.Although multimode resonator has been suggested, simply apply to width
The design of band filter.The passband selectivity and belt resistance inhibitor system of bandpass filter of the prior art be not high, it is impossible to meets existing
For the demand of microwave telecommunication system.
The content of the invention
The main object of the present invention provide it is a kind of based on four mould defects formula resonator three-passband filter, pass through four moulds
Defect formula resonator and micro-strip step electric impedance resonator combine, six transmission zeros can be produced, with higher logical
Band selectivity, it may have higher belt resistance inhibitor system.
To achieve the above object, the invention provides it is a kind of based on four mould defects formula resonator three-passband filter,
Including PCB dielectric-slabs, four mould defects ground formula resonator, two microstrip feed lines and micro-strip step electric impedance resonator, four mould lacks
Ground formula resonator etching is fallen on a surface of PCB dielectric-slabs, two microstrip feed lines and micro-strip step electric impedance resonator are etched respectively
On another surface of PCB dielectric-slabs, wherein：
The four moulds defect formula resonator shape on the four moulds defect formula resonator the first central axis pair
Claim, and on the four moulds defect formula resonator the second central axis it is symmetrical, the first central axis and the second central axis
It is mutually perpendicular to；
The four moulds defect formula resonator include the first resonant element and four the second resonant elements, the first resonant element
It is made up of first line of rabbet joint, second line of rabbet joint and third slot line, the second resonant element is by the 4th line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint structure
Into；One end of four the second resonant elements connects four ends of the first resonant element respectively, and each second resonant element is to first
Central axis extend and to four mould defects formula resonator center bend；Positioned at the first central axis or the second central axis
Interval is separated between two the second resonant elements of homonymy；
The front end of two microstrip feed lines extends respectively into edge two ports of formation of PCB dielectric-slabs, two microstrip feed lines
End extend respectively from two article of the 4th line of rabbet joint positioned at the first line of rabbet joint homonymy to the first central axis and terminate close to second humorous
Shake the place of remaining silent of unit, and two microstrip feed lines are symmetrical on the first central axis, and the spacing between two microstrip feed line ends is leaned on
Closely, two microstrip feed line formation sources carry the feed structure of coupling；
The shape of the micro-strip step electric impedance resonator is symmetrical on the first central axis, and the micro-strip stepped impedance is humorous
Device shake close to two microstrip feed lines, the micro-strip step electric impedance resonator includes two the 3rd resonant elements and one the 4th humorous
Shake unit, and the end spacing of two the 3rd resonant elements is equal to the spacing between two microstrip feed line ends, two the 3rd resonance
Openend of the unit close to two ends of the first central axis respectively with the 4th resonant element is connected.
It is preferred that, one end of first line of rabbet joint connects the middle part of second line of rabbet joint, the other end connection the 3rd of first line of rabbet joint
The middle part of the line of rabbet joint, second line of rabbet joint and third slot line are parallel and vertical with first line of rabbet joint；One end of 4th line of rabbet joint connects the second groove
The other end of line or third slot line, and extend to the first central axis, the other end of the 4th line of rabbet joint connects the one of the 5th line of rabbet joint
End, the other end of the 5th line of rabbet joint connects one end of the 6th line of rabbet joint, and extends to the second central axis, the 4th line of rabbet joint and the 6th line of rabbet joint
It is parallel and vertical with the 5th line of rabbet joint.
It is preferred that, part first line of rabbet joint, second line of rabbet joint or third slot line positioned at the first line of rabbet joint side, positioned at
The PCB medium plate shapes that the 4th line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint in same second resonant element of one line of rabbet joint side are surrounded
Into the first pole plate, first pole plate is shaped as L-shaped, and the quantity of the first pole plate is two, and two the first pole plates are in first
Heart axis for axis symmetry.
It is preferred that, part first line of rabbet joint, second line of rabbet joint or third slot line positioned at the first line of rabbet joint opposite side, it is located at
The PCB media that the 4th line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint in same second resonant element of first line of rabbet joint opposite side are surrounded
Plate shape is into the second pole plate, and the second pole plate is shaped as L-shaped, and the quantity of the second pole plate is two, and two the second pole plates are on first
Central axis axial symmetry.
It is preferred that, the length of first line of rabbet joint is L1=23.5mm, width are W1=0.68mm；Second line of rabbet joint and the 3rd
The length of the line of rabbet joint is L2=12mm；Second line of rabbet joint and the width of third slot line are W2=0.3mm；The length of 4th line of rabbet joint is
L3=11.05mm, width are W3=0.3mm；The length of 5th line of rabbet joint is L4=2.8mm, width are W3=0.3mm；6th line of rabbet joint
Length be L5=7.3mm, width are W3=0.3mm；The distance between two article of the 5th line of rabbet joint positioned at the first line of rabbet joint homonymy is S1
=0.8mm, the distance between first line of rabbet joint and the 6th line of rabbet joint are S2=2.27mm.
It is preferred that, the 3rd resonant element includes the first microstrip line and the second microstrip line, and one end of the first microstrip line connects
It is connected to one end of the second microstrip line, the length of the first microstrip line is more than the length of the second microstrip line, the first microstrip line and second micro-
Width with line is identical；4th resonant element include the 3rd microstrip line, two the 4th microstrip lines, two the 5th microstrip lines with
And two the 6th microstrip lines, the two ends of the 3rd microstrip line connect one end of two the 4th microstrip lines, two the 4th microstrip lines respectively
The other end connect one end of two the 5th microstrip lines respectively, the other ends of two the 5th microstrip lines connect respectively two it is the 6th micro-
One end with line, one end of two the 6th microstrip lines as the 4th resonant element openend.
It is preferred that, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line and the 6th microstrip line of the 4th resonant element
Width all same, and less than the 3rd resonant element the first microstrip line and the second microstrip line width, wherein：
The length L of first microstrip line6=11.4mm, the length L of the second microstrip line7=6.4mm, the first microstrip line and second
The width W of microstrip line6=1.0mm, the spacing between the second microstrip line and two microstrip feed lines is g=0.3mm；
3rd microstrip line, the 4th microstrip line, the width of the 5th microstrip line and the 6th microstrip line are W8=0.4mm, the 3rd
The length L of microstrip line11=7.6mm, the length L of the 4th microstrip line10=2.58mm, the length of the 5th microstrip line is L9=6.5mm,
The length of 6th microstrip line is L8=1.5mm.
It is preferred that, first resonant element is shaped as H-shaped or the H-shaped that is defined, and the second resonant element is shaped as L
Shape, quasi- L-shaped, U-shaped or the U-shaped that is defined, the 3rd resonant element are shaped as L-shaped or quasi- L-shaped, the shape of the 4th resonant element
Shape is the convex of opening.
It is preferred that, two microstrip feed lines are corresponding with the position of two article of the 4th line of rabbet joint of the first line of rabbet joint homonymy respectively and close
Symmetrical in the first central axis, the width of microstrip feed line is wider than the width of the 4th line of rabbet joint, and the end of the microstrip feed line is terminated at
At the 5th line of rabbet joint, the edge close to the second central axis to remote second center of the 4th line of rabbet joint of each microstrip feed line
The distance at the edge of axis is d1=1.35mm.
It is preferred that, the spacing d between two microstrip feed line ends2=1.6mm, the width of each microstrip feed line is
W0=2.34mm, the impedance of each microstrip feed line is 50 Ω.
Compared to prior art, it is of the present invention based on four mould defects formula resonator three-passband filter, based on four
Mould defect formula resonator and micro-strip step electric impedance resonator combine, not only process simple with low cost, and can produce
Raw three basic transmission passbands, form three passband filter structures, therefore are widely used in broadband and multi-frequency band radio-frequency microwave is logical
In letter.Due to four mould defects formula resonator be to slot to obtain on feeding plane, therefore extra resonance body need not be increased, had
There is the function of reducing three-passband filter size.Due to two microstrip feed lines and four mould defects formula resonator and micro-strip ladder resistance
Stiffness of coupling difference between antiresonance device, therefore the three-passband filter has altogether six transmission zeros, with high
Passband selectivity, and also there is higher belt resistance inhibitor system.
Brief description of the drawings
Fig. 1 be the present invention based on four mould defects formula resonator three-passband filter overall structure diagram；
Fig. 2 be four mould defects in three-passband filter of the present invention formula resonator etch in PCB dielectric-slab bottom surfaces
Structural representation；
Fig. 3 be four mould defects the first resonant element in formula resonator structure chart；
Fig. 4 be four mould defects the second resonant element in formula resonator structure chart；
Fig. 5 is that two microstrip feed lines and micro-strip step electric impedance resonator in three-passband filter of the present invention are etched in PCB
The structural representation of dielectric-slab upper surface；
Fig. 6 be micro-strip step electric impedance resonator in the 3rd resonant element structure chart；
Fig. 7 be micro-strip step electric impedance resonator in the 4th resonant element structure chart；
Fig. 8 be the present invention based on four mould defects formula resonator three-passband filter PCB emulation with circuit simulation knot
Fruit schematic diagram；
Fig. 8 is the S parameter schematic diagram with narrower bandwidth first, the three-passband filter of the 3rd passband；
Fig. 9 is the S parameter schematic diagram with wider bandwidth first, the three-passband filter of the 3rd passband；
Figure 10 is the measurement result and simulation result schematic diagram of the S parameter of three-passband filter of the present invention.
The object of the invention is realized, functional characteristics and advantage will will in the lump join in embodiment part in conjunction with the embodiments
It is described further according to accompanying drawing.
Embodiment
Further to illustrate the present invention to reach the technological means and effect that above-mentioned purpose is taken, below in conjunction with accompanying drawing
And preferred embodiment, embodiment, structure, feature and its effect to the present invention are described in detail.It should be appreciated that this
The specific embodiment of place description is not intended to limit the present invention only to explain the present invention.
Shown in reference picture 1, Fig. 1 be the present invention based on four mould defects formula resonator three-passband filter overall structure
Schematic diagram.In the present embodiment, three-passband filter proposed by the present invention include four mould defects formula resonator (QMDGSR) 1,
Radio frequency ground level 2, two microstrip feed lines 3 and micro-strip step electric impedance resonator (MSIR) 4.Four moulds defect ground formula resonator
1 etching is on a surface (such as lower surface, with reference to shown in Fig. 2) for PCB dielectric-slabs 10, the surface with not etching four mould defects formula
The remainder of resonator 1 is referred to as radio frequency ground level 2, and two microstrip feed lines 3 and micro-strip step electric impedance resonator 4 are etched respectively
On another surface (such as upper surface, with reference to shown in Fig. 5) of PCB dielectric-slabs 10.The PCB dielectric-slabs 10 are a kind of metal medium
Plate, the thickness of the PCB dielectric-slabs 10 is 0.79mm, and dielectric constant is 2.34.
With reference to shown in Fig. 2, Fig. 2 be four mould defects in three-passband filter of the present invention formula resonator etching be situated between in PCB
The structural representation of scutum bottom surface.The four moulds defect formula resonator 1 have up and down and left and right be symmetrical structure, make
Formula resonator 1 has four modes of resonance simultaneously with obtaining the four moulds defect, and the resonant frequency of each mode of resonance has well
Adjustability.The four moulds defect formula resonator 1 shape and structure be described in detail below：Four moulds defect ground formula resonator
1 shape on the four moulds defect formula resonator 1 the first central axis ab it is symmetrical, and on the four moulds defect formula it is humorous
Shake device 1 the second central axis cd it is symmetrical, the first central axis ab is mutually perpendicular to the second central axis cd.In the present embodiment
In, the four moulds defect formula resonator 1 include the first resonant element 11 and four the second resonant elements 12.Wherein, first is humorous
That shakes unit 11 is shaped as H-shaped or the H-shaped that is defined, and the quasi- H-shaped defined in the present embodiment is the shape for being similar to H-shaped on the whole.
Second resonant element 12 is shaped as L-shaped, quasi- L-shaped, U-shaped or the U-shaped that is defined, and the quasi- L-shaped defined in the present embodiment is on the whole
It is similar to L-shaped, bent less one section an of free end (one end not being connected with the first resonant element 11) for such as L-shaped,
Very small one section of the length is shorter for the length on side where the free end.Quasi- U-shaped defined in this implementation is
Be similar on the whole a free end (one end not being connected with the first resonant element 11) for U-shaped can bend again at least one times,
The length of bending end after each bending is shorter for the length on side where the free end, so that on the whole still
So it is similar to U-shaped, is not significantly affected by the performance of the second resonant element 12.One end of four the second resonant elements 12 is connected respectively
Four ends of the first resonant element 11.Each second resonant element 12 extends to the first central axis ab and to four mould defects ground formula
The center bending of resonator 1, the number of times of the bending is twice.L-shaped, quasi- L-shaped, U-shaped or the quasi- U of four the second resonant elements 12
The surrounding of with being open four mould defects of the equal direction formula resonator 1 of shape.Positioned at two the second resonance of the first central axis ab homonymies
Interval is separated between unit 12.
With reference to as shown in figure 3, Fig. 3 be four mould defects the first resonant element in formula resonator structure chart.In this reality
Apply in example, first resonant element 11 is made up of first line of rabbet joint 111, second line of rabbet joint 112 and third slot line 113.First groove
One end of line 111 connects the middle part of second line of rabbet joint 112, and the other end of first line of rabbet joint 111 connects the middle part of third slot line 113.The
Two line of rabbet joint 112 and third slot line 113 are parallel and vertical with first line of rabbet joint 111, therefore, first line of rabbet joint 111, second line of rabbet joint 112
H-shaped or quasi- H-shaped are constituted with third slot line 113.
With reference to as shown in figure 4, Fig. 4 be four mould defects the second resonant element in formula resonator structure chart.In this reality
Apply in example, when the second resonant element 12 is U-shaped or quasi- U-shaped, second resonant element 12 is by the 4th line of rabbet joint 124, the 5th line of rabbet joint
125 and the 6th the line of rabbet joint 126 constitute.One end of 4th line of rabbet joint 124 connects second line of rabbet joint 112 or the other end of third slot line 113,
And extend to the first central axis ab, the other end of the 4th line of rabbet joint 124 connects one end of the 5th line of rabbet joint 125, the 5th line of rabbet joint 125
The other end connects one end of the 6th line of rabbet joint 126, and extends to the second central axis cd.4th line of rabbet joint 124 and the 6th line of rabbet joint 126 are flat
Row is simultaneously vertical with the 5th line of rabbet joint 125.Wherein, the length of the 6th line of rabbet joint 126 is shorter than the length of the 4th line of rabbet joint 224.Therefore, the 4th groove
Line 124, the 5th line of rabbet joint 125 and the 6th line of rabbet joint 126 constitute U-shaped or quasi- U-shaped.When the second resonant element 12 be L-shaped, quasi- L-shaped,
Second resonant element 12 can also pass through corresponding line of rabbet joint formation L-shaped or quasi- L-shaped structure.
Referring again to shown in Fig. 2, first line of rabbet joint of part 111, second line of rabbet joint 112 positioned at the side of first line of rabbet joint 111 or
Third slot line 113, the 4th line of rabbet joint 124 in same second resonant element 12 of the side of first line of rabbet joint 111, the 5th line of rabbet joint 125
PCB dielectric-slabs the first pole plate 31 of formation surrounded with the 6th line of rabbet joint 126, first pole plate 31 is shaped as L-shaped.First pole plate 31
Quantity for two (be respectively the PCB dielectric-slabs surrounded with second line of rabbet joint 112 and the PCB media surrounded with third slot line 113
Plate), two the first pole plates 31 are on the first central axis ab axial symmetry.It is first line of rabbet joint of part 111, another positioned at first line of rabbet joint 111
Second line of rabbet joint 112 or third slot line 113 of side, in same second resonant element 12 of the opposite side of first line of rabbet joint 111
The 4th line of rabbet joint 124, PCB dielectric-slabs the second pole plate 32 of formation for surrounding of the 5th line of rabbet joint 125 and the 6th line of rabbet joint 126, the second pole plate
32 are shaped as L-shaped.It (is respectively the PCB dielectric-slabs that are surrounded with second line of rabbet joint 112 and with that the quantity of second pole plate 32, which is two,
The PCB dielectric-slabs that third slot line 113 is surrounded), two the second pole plates 32 are on the first central axis ab axial symmetry.
Referring again to shown in Fig. 1, the length of first line of rabbet joint 111 is L1=23.5mm, width are W1=0.68mm；Second line of rabbet joint
112 and the equal length of third slot line 113, it is L2=12mm；Second line of rabbet joint 112 and the width of third slot line 113 are equal,
For W2=0.3mm；The length of 4th line of rabbet joint 124 is L3=11.05mm, width are W3=0.3mm；The length of 5th line of rabbet joint 125 is
L4=2.8mm, width are W3=0.3mm；The length of 6th line of rabbet joint is L5=7.3mm, width are W3=0.3mm；Positioned at the first groove
The distance between two article of the 5th line of rabbet joint 125 of the homonymy of line 111 is S1=0.8mm, between first line of rabbet joint 111 and the 6th line of rabbet joint 126
Distance be S2=2.27mm；
In the present embodiment, because two microstrip feed lines 3 are separately positioned on relative to four mould defects ground formula resonator 1
Be arranged on another surface of PCB dielectric-slabs 10, thus two microstrip feed lines 3 on another surface of PCB dielectric-slabs 10 to four moulds
Defect formula resonator 1 fed.In the present embodiment, the front end of two microstrip feed lines 3 extends respectively into PCB dielectric-slabs 10
Edge formation two port (first port P1With second port P2), the end of microstrip feed line 3 is respectively from positioned at first line of rabbet joint
Two article of the 4th line of rabbet joint 124 of 111 homonymies extends to the first central axis ab and terminates the L-shaped of close second resonant element 12, quasi- L
The place of remaining silent of shape, U-shaped or quasi- U-shaped, two microstrip feed lines 3 are symmetrical on the first central axis ab.It is emphasized that two
Microstrip feed line 3 is simultaneously on two article of the 4th line of rabbet joint 124 of the same upside of first line of rabbet joint 111, or be located at first line of rabbet joint simultaneously
On two article of the 4th line of rabbet joint 124 of 111 same downsides, rather than positioned at four mould defects formula resonator 1 diagonal on two
On 4th line of rabbet joint 124.
It is preferred that, two microstrip feed lines 3 are corresponding with the position of two article of the 4th line of rabbet joint 124 of the homonymy of first line of rabbet joint 111, and close
It is symmetrical in the first central axis ab.The width of microstrip feed line 3 is wider than the width of the 4th line of rabbet joint 124 so that the covering part of microstrip feed line 3
The 4th line of rabbet joint 124 divided.The width W of every microstrip feed line 30Preferably 2.34mm, the other end of microstrip feed line 3 is ended close to
At 5th line of rabbet joint 125, the 5th line of rabbet joint 125 is not touched.It is preferred that, the impedance of each microstrip feed line 3 is 50 Ω, each
The edge close to the second central axis cd of root microstrip feed line 3 to the edge away from the second central axis cd of the 4th line of rabbet joint 124
Distance be d1, the spacing between two microstrip feed lines 3 is close, and it is d to define the spacing between two ends of microstrip feed line 32, should
Spacing is d2To be preferably d less than 5mm (i.e. arbitrary value between 0-5mm), in the present embodiment2=1.6mm；Due to two micro-strips
Spacing between feeder line 3 is d2It is determined that, once the length of PCB dielectric-slabs 10 determines (such as L0), therefore each microstrip feed line 3
Length then be d0=(L0-d2)/2。
With reference to shown in Fig. 5, Fig. 5 is two microstrip feed lines and micro-strip stepped impedance resonance in three-passband filter of the present invention
Device etches the structural representation in PCB dielectric-slabs upper surface.In the present embodiment, the shape of the micro-strip step electric impedance resonator 4
Shape is symmetrical on the first central axis ab, and the micro-strip step electric impedance resonator 4 is close to two microstrip feed lines 3.The micro-strip
Spacing between step electric impedance resonator 4 and two microstrip feed lines 3 is preferably g=0.3mm.The micro-strip step electric impedance resonator
4 include two the 3rd resonant elements 41 and the 4th resonant element 42.3rd resonant element 41 is shaped as L-shaped or quasi- L
Shape, the convex for being shaped as opening of the 4th resonant element 42.3rd resonant element 41 is symmetrical on the first central axis ab, therefore
The quantity of 3rd resonant element 41 is two, and the end spacing of two the 3rd resonant elements 41 is equal to two ends of microstrip feed line 3
Between spacing, be d2, the spacing is d2Less than 5mm, the present embodiment is preferably d2=1.6mm.Two the 3rd resonant elements 41
Openend close to the first central axis ab two ends respectively with the 4th resonant element 42 is connected.
With reference to shown in Fig. 6, Fig. 6 be micro-strip step electric impedance resonator in the 3rd resonant element structure chart.In this implementation
In example, the 3rd resonant element 41 includes the first microstrip line 411 and the second microstrip line 412, and one end of the first microstrip line 411 is connected to
One end of second microstrip line 412 forms the shape of L-shaped or quasi- L-shaped.The length of first microstrip line 411 is more than the second microstrip line 412
Length, the first microstrip line 411 is identical with the width of the second microstrip line 412, the first microstrip line 411 and the structure of the second microstrip line 412
Into impedance be Z1.Preferably, the length of the first microstrip line 411 is L6=11.4mm, the length of the second microstrip line 412 is L7=
The width W of 6.4mm, the first microstrip line 411 and the second microstrip line 4126=1.0mm.Second microstrip line 412 and two microstrip feed lines
Spacing between 3 is preferably g=0.3mm.
With reference to shown in Fig. 7, Fig. 7 be micro-strip step electric impedance resonator in the 4th resonant element structure chart.In this implementation
In example, the 4th resonant element 42 include the 3rd microstrip line 421, two pieces the 4th microstrip lines 422, two the 5th microstrip lines 423 and
Two the 6th microstrip lines 424.Wherein, the two ends of the 3rd microstrip line 421 connect one end of two the 4th microstrip lines 422, two respectively
The other end of the microstrip line 422 of root the 4th connects one end of two the 5th microstrip lines 423 respectively, two the 5th microstrip lines 423 it is another
One end connects one end of two the 6th microstrip lines 424 respectively, and one end of two the 6th microstrip lines 424 is used as the 4th resonant element 42
Openend, so as to form the convex of opening.Constitute the 3rd microstrip line 421 of the 4th resonant element 42, the 4th microstrip line 422,
The width all same of 5th microstrip line 423 and the 6th microstrip line 424, and less than the first microstrip line for constituting the 3rd resonant element 41
411 and second microstrip line 412 width.3rd microstrip line 421, two pieces the 4th microstrip line 422, two and of the 5th microstrip line 423
The impedance that two the 6th microstrip lines 424 are constituted is Z2.In the present embodiment, the 3rd microstrip line 421, the 4th microstrip line the 422, the 5th
The width of the microstrip line 424 of microstrip line 423 and the 6th is preferably W8=0.4mm.The length of 3rd microstrip line 421 is preferably L11=
7.6mm, the length of the 4th microstrip line 422 is preferably L10=2.58mm, the length of the 5th microstrip line 423 is preferably L9=6.5mm,
The length of 6th microstrip line 424 is preferably L8=1.5mm.
The present invention is based on three passband filter structures, by micro-strip step electric impedance resonator (MSIR) 4 and four mould defects formula it is humorous
The three passbands filtering that device (QMDGSR) 1, the mode of two combinations of microstrip feed lines 3 of shaking are constituted, with very high passband selectivity.Structure
The 3rd resonant element 41 into micro-strip step electric impedance resonator 4 is different with the width of the microstrip line of the 4th resonant element 42, correspondence
Impedance is Z2And Z1, in order to simplify design, this two parts has identical electrical length, i.e. θ0.The first of the three-passband filter is humorous
Pattern of shaking (m1) is in the first passband；Second mode of resonance (m2), three modes of resonance (m3) are in the second passband；4th resonant mode
Formula (m4) is in the 3rd passband., can by adjusting the base time mode of resonance and one class resonant frequency of micro-strip step electric impedance resonator 4
To produce two other mode of resonance, i.e. the 5th mode of resonance (R1) and the six or five mode of resonance (R2), and it is located at first respectively
In passband and the 3rd passband.Wherein, the 5th mode of resonance R1 frequency is located at the frequency less than the first mode of resonance m1, the six or five
Mode of resonance R2 frequency is more than the 4th mode of resonance m4 frequency, by tuning the 5th mode of resonance R1 and the 6th mode of resonance
R2 frequency (fR1, fR2) adjust the 5th mode of resonance R1 and the first mode of resonance m1 resonant frequency spacing, and the 4th humorous
The mode of resonance R2 of mode m of shaking 4 and the 6th resonant frequency spacing, can effectively change the bandwidth of the first passband and the 3rd passband,
Wherein fR1And fR2It can be calculated and obtained by equation below (1) and (2).
tan2θ0=K, K=Z2/Z1 (1)
The present invention is by adjusting fR1And fR2, can separately design out the first, the 3rd passband with narrower bandwidth and compared with
Two class three-passband filters of the first, the 3rd passband of wide bandwidth.As shown in figure 8, for narrower bandwidth first, the 3rd passband
Three-passband filter S parameter schematic diagram.As shown in figure 9, to be filtered with three passbands of wider bandwidth first, the 3rd passband
The S parameter schematic diagram of device.Wherein, S11Represent two-port P1And P2Reflectance factor, S21Represent two-port P1And P2Between transmission
Coefficient.
In the present invention, due to the end distance of two microstrip feed lines 3 lean on it is close (between two microstrip feed lines 3
Away from d2For 0-5mm), therefore form the feed structure that source carries coupling.Because the source carries the formation of coupling, the feed structure can
Four transmission zeros (TZ1, TZ2, TZ3, TZ4) are produced, so as to form three passband filter structures.As long as it should be noted that
The end distance of two microstrip feed lines 3 is less than 5mm, can form three pass-band performances.The specific embodiment d of the present invention2Preferably
1.6mm, can obtain preferable three pass-band performance.Due to two mould defects of microstrip feed line 3 and four ground formula resonator 1 and micro-strip rank
Stiffness of coupling difference between terraced electric impedance resonator 4, the three-passband filter is in the first passband lower limiting frequency and the 3rd passband
Upper cut off frequency generates two transmission zeros (TZ5, TZ6) again, so as to substantially increase the passband choosing of the three-passband filter
Selecting property.
As shown in Figure 10, Figure 10 is the measurement result and simulation result schematic diagram of the S parameter of three-passband filter of the present invention.
It can be seen from fig. 10 that because the three-passband filter has six transmission zeros (TZ1, TZ2, TZ3, TZ4, TZ5, TZ6),
Therefore with high passband selectivity.Wherein, lower stopband maximum inhibition degree is more than 83.3dB, and upper stopband maximum inhibition degree exceedes
43.9dB, therefore also there is higher belt resistance inhibitor system.
It is of the present invention based on four mould defects formula resonator three-passband filter, based on four mould defects ground formula resonator
Combined with micro-strip step electric impedance resonator, not only process simple with low cost, and it is logical to produce three basic transmission
Band, forms three passband filter structures, therefore be widely used in broadband and multi-frequency band radio-frequency microwave communication.Due to four mould defects
Ground formula resonator is to slot to obtain on feeding plane, therefore need not increase extra resonance body, is filtered with three passbands are reduced
The function of device size.Coupling due to two microstrip feed lines and four mould defects between formula resonator and micro-strip step electric impedance resonator
Intensity difference is closed, the three-passband filter generates two again in the first passband lower limiting frequency and threeway band upper cut off frequency
Transmission zero, therefore the three-passband filter has altogether six transmission zeros, with high passband selectivity, and also has
Higher belt resistance inhibitor system.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or the equivalent function conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. it is a kind of based on four mould defects formula resonator three-passband filter, including PCB dielectric-slabs, it is characterised in that this three
Pass filter also includes four mould defects ground formula resonator, two microstrip feed lines and micro-strip step electric impedance resonator, four mould
Defect formula resonator etching on a surface of PCB dielectric-slabs, two microstrip feed lines and micro-strip step electric impedance resonator are carved respectively
Lose on another surface of PCB dielectric-slabs, wherein：
The four moulds defect formula resonator shape on the four moulds defect formula resonator the first central axis it is symmetrical, and
And on the four moulds defect formula resonator the second central axis it is symmetrical, the first central axis is mutually vertical with the second central axis
Directly；
The four moulds defect formula resonator include the first resonant element and four the second resonant elements, the first resonant element is by the
One line of rabbet joint, second line of rabbet joint and third slot line are constituted, and the second resonant element is made up of the 4th line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint；
One end of four the second resonant elements connects four ends of the first resonant element respectively, and each second resonant element is to the first center
Axis extend and to four mould defects formula resonator center bend；Positioned at two the second resonance lists of the first central axis homonymy
Interval is separated between member；
The front end of two microstrip feed lines extends respectively into edge two ports of formation of PCB dielectric-slabs, the end of two microstrip feed lines
End extends to the first central axis from two article of the 4th line of rabbet joint positioned at the first line of rabbet joint homonymy and terminated close to the second resonance list respectively
The place of remaining silent of member, two microstrip feed lines are symmetrical on the first central axis, and the spacing between two microstrip feed line ends is close, and two
Root microstrip feed line formation source carries the feed structure of coupling；
The shape of the micro-strip step electric impedance resonator is symmetrical on the first central axis, and the micro-strip step electric impedance resonator
Close to two microstrip feed lines, the micro-strip step electric impedance resonator includes two the 3rd resonant elements and a 4th resonance list
Member, the end spacing of two the 3rd resonant elements is equal to the spacing between two microstrip feed line ends, two the 3rd resonant elements
Openend close to two ends of the first central axis respectively with the 4th resonant element is connected.
2. it is as claimed in claim 1 based on four mould defects formula resonator three-passband filter, it is characterised in that described the
One end of one line of rabbet joint connects the middle part of second line of rabbet joint, and the other end of first line of rabbet joint connects the middle part of third slot line, second line of rabbet joint and
Third slot line is parallel and vertical with first line of rabbet joint；One end of 4th line of rabbet joint connects the another of second line of rabbet joint or third slot line
End, and extend to the first central axis, the other end of the 4th line of rabbet joint connects one end of the 5th line of rabbet joint, and the other end of the 5th line of rabbet joint connects
One end of the 6th line of rabbet joint is connect, and is extended to the second central axis, the 4th line of rabbet joint and the 6th line of rabbet joint are parallel and vertical with the 5th line of rabbet joint.
3. it is as claimed in claim 1 based on four mould defects formula resonator three-passband filter, it is characterised in that part institute
State first line of rabbet joint, second line of rabbet joint or third slot line positioned at the first line of rabbet joint side, same second positioned at the first line of rabbet joint side
PCB dielectric-slabs the first pole plate of formation that the 4th line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint in resonant element are surrounded, first pole plate
Be shaped as L-shaped, the quantity of the first pole plate is two, and two the first pole plates are on the first central axis axial symmetry.
4. it is as claimed in claim 1 based on four mould defects formula resonator three-passband filter, it is characterised in that part institute
State first line of rabbet joint, second line of rabbet joint or third slot line positioned at the first line of rabbet joint opposite side, positioned at the same of the first line of rabbet joint opposite side
PCB dielectric-slabs the second pole plate of formation that the 4th line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint in second resonant element are surrounded, the second pole
Plate is shaped as L-shaped, and the quantity of the second pole plate is two, two the second pole plates are on the first central axis axial symmetry.
5. it is as claimed in claim 1 based on four mould defects formula resonator three-passband filter, it is characterised in that described the
The length of one line of rabbet joint is L1=23.5mm, width are W1=0.68mm；The length of second line of rabbet joint and third slot line is L2=
12mm；Second line of rabbet joint and the width of third slot line are W2=0.3mm；The length of 4th line of rabbet joint is L3=11.05mm, width are
W3=0.3mm；The length of 5th line of rabbet joint is L4=2.8mm, width are W3=0.3mm；The length of 6th line of rabbet joint is L5=7.3mm,
Width is W3=0.3mm；The distance between two article of the 5th line of rabbet joint positioned at the first line of rabbet joint homonymy is S1=0.8mm, first line of rabbet joint with
The distance between 6th line of rabbet joint is S2=2.27mm.
6. it is as claimed in claim 1 based on four mould defects formula resonator three-passband filter, it is characterised in that described the
Three resonant elements include the first microstrip line and the second microstrip line, and one end of the first microstrip line is connected to one end of the second microstrip line,
The length of first microstrip line is more than the length of the second microstrip line, and the width of the first microstrip line and the second microstrip line is identical；Described
Four resonant elements include the 3rd microstrip line, two the 4th microstrip lines, two the 5th microstrip lines and two the 6th microstrip lines, the 3rd
The two ends of microstrip line connect one end of two the 4th microstrip lines respectively, and the other end of two the 4th microstrip lines connects two respectively
One end of five microstrip lines, the other end of two the 5th microstrip lines connects one end of two the 6th microstrip lines respectively, and two the 6th micro-
One end with line as the 4th resonant element openend.
7. it is as claimed in claim 6 based on four mould defects formula resonator three-passband filter, it is characterised in that described the
3rd microstrip line of four resonant elements, the 4th microstrip line, the width all same of the 5th microstrip line and the 6th microstrip line, and less than the
First microstrip line of three resonant elements and the width of the second microstrip line.
8. it is as claimed in claim 7 based on four mould defects formula resonator three-passband filter, it is characterised in that described the
The length L of one microstrip line6=11.4mm, the length L of the second microstrip line7The width of=6.4mm, the first microstrip line and the second microstrip line
Spend W6=1.0mm, the spacing between the second microstrip line and two microstrip feed lines is g=0.3mm；3rd microstrip line, the 4th
The width of microstrip line, the 5th microstrip line and the 6th microstrip line is W8=0.4mm, the length L of the 3rd microstrip line11=7.6mm, the
The length L of four microstrip lines10=2.58mm, the length of the 5th microstrip line is L9=6.5mm, the length of the 6th microstrip line is L8=
1.5mm。
9. it is as claimed in claim 1 based on four mould defects formula resonator three-passband filter, it is characterised in that described two
Root microstrip feed line is corresponding with the position of two article of the 4th line of rabbet joint of the first line of rabbet joint homonymy respectively and symmetrical on the first central axis, micro-
The width of ribbon feeder is wider than the width of the 4th line of rabbet joint, and the end of the microstrip feed line is ended close at the 5th line of rabbet joint, Mei Yigen
The distance at the edge close to the second central axis of microstrip feed line to the edge away from the second central axis of the 4th line of rabbet joint is d1
=1.35mm.
10. it is as claimed in claim 9 based on four mould defects formula resonator three-passband filter, it is characterised in that it is described
Spacing d between two microstrip feed line ends2=1.6mm, the width of each microstrip feed line is W0=2.34mm, each micro-
The impedance of ribbon feeder is 50 Ω.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710162720.1A CN106953146B (en) | 2017-03-18 | 2017-03-18 | Based on four mould defects the three-passband filter of formula resonator |
| PCT/CN2017/107206 WO2018171184A1 (en) | 2017-03-18 | 2017-10-21 | Quad-mode defected ground structure resonator-based triple-passband filter |
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|---|---|---|---|
| CN201710162720.1A CN106953146B (en) | 2017-03-18 | 2017-03-18 | Based on four mould defects the three-passband filter of formula resonator |
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| CN106953146A true CN106953146A (en) | 2017-07-14 |
| CN106953146B CN106953146B (en) | 2019-03-26 |
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| WO (1) | WO2018171184A1 (en) |
Cited By (7)
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| CN107895829A (en) * | 2017-12-07 | 2018-04-10 | 电子科技大学 | A kind of microstrip filter with the accurate oval bandpass response of three ranks |
| CN108054476A (en) * | 2017-12-04 | 2018-05-18 | 广东技术师范学院 | A kind of four band-pass filter of frequency band of microwave |
| WO2018171184A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Quad-mode defected ground structure resonator-based triple-passband filter |
| WO2018171182A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Multimode triple-passband filter |
| WO2018171181A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Multimode triple-passband filter structure |
| WO2018171185A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Triple-passband filter structure having four transmission zeros |
| CN109473756A (en) * | 2018-11-16 | 2019-03-15 | 西安电子科技大学 | A kind of complete restructural difference filter |
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| WO2018171184A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Quad-mode defected ground structure resonator-based triple-passband filter |
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| CN107895829A (en) * | 2017-12-07 | 2018-04-10 | 电子科技大学 | A kind of microstrip filter with the accurate oval bandpass response of three ranks |
| CN109473756A (en) * | 2018-11-16 | 2019-03-15 | 西安电子科技大学 | A kind of complete restructural difference filter |
| CN109473756B (en) * | 2018-11-16 | 2020-01-31 | 西安电子科技大学 | kinds of fully reconfigurable differential filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106953146B (en) | 2019-03-26 |
| WO2018171184A1 (en) | 2018-09-27 |
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