CN206602159U - Multimode three-passband filter - Google Patents
Multimode three-passband filter Download PDFInfo
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- CN206602159U CN206602159U CN201720265179.2U CN201720265179U CN206602159U CN 206602159 U CN206602159 U CN 206602159U CN 201720265179 U CN201720265179 U CN 201720265179U CN 206602159 U CN206602159 U CN 206602159U
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Abstract
The utility model discloses a kind of multimode 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.The physical dimension of three-passband filter described in the utility model is small, and can produce six transmission zeros, with higher passband selectivity and belt resistance inhibitor system.
Description
Technical field
The utility model is related to frequency microwave communication technical field, more particularly to a kind of new multimode three-passband 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 completely full
The demand of sufficient modern microwave communication system.
Utility model content
Main purpose of the present utility model provides a kind of multimode three-passband filter, by four mould defects formula resonator and
Micro-strip step electric impedance resonator is combined, and can produce six transmission zeros, with higher passband selectivity, it may have compared with
High belt resistance inhibitor system.
To achieve the above object, the utility model provides a kind of multimode three-passband filter, including PCB dielectric-slabs, four
Mould defect ground formula resonator, two microstrip feed lines and micro-strip step electric impedance resonator, four moulds defect ground formula resonator etching
On a surface of PCB dielectric-slabs, two microstrip feed lines and micro-strip step electric impedance resonator are etched in the another of PCB dielectric-slabs respectively
Surface, 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；Two positioned at the first central axis homonymy are second humorous
Shake interval is separated between unit, first resonant element is shaped as H-shaped or the H-shaped that is defined, the shape of the second resonant element
For L-shaped, quasi- L-shaped, U-shaped or the U-shaped that is defined；
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 3rd resonant element is shaped as L-shaped or quasi- L-shaped, the convex for being shaped as opening of the 4th resonant element, two
The end spacing of 3rd resonant element is equal to the spacing between two microstrip feed line ends, and two the 3rd resonant elements are close to first
Openend of two ends of 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 extended 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.
It is preferred that, the length L of the first microstrip line6=11.4mm, the length L of the second microstrip line7=6.4mm, the first microstrip line
With the width W of the second 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 length of the 3rd microstrip line
L11=7.6mm, the length L of the 4th microstrip line10=2.58mm, the length of the 5th microstrip line is L9=6.5mm, the 6th microstrip line
Length is L8=1.5mm.
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, multimode three-passband filter described in the utility model, 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, therefore the three-passband filter has altogether six transmission zeros, with high passband selectivity, and also has
There is higher belt resistance inhibitor system.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the utility model multimode three-passband filter；
Fig. 2 be four mould defects in the utility model three-passband filter formula resonator etching in PCB dielectric-slabs bottom
The structural representation in face；
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 etching in the utility model three-passband filter exist
The structural representation of PCB dielectric-slabs 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 is PCB emulation and the Simulation results schematic diagram of the utility model multimode three-passband filter；
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 the utility model three-passband filter.
The realization of the utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, will be in embodiment part one
And be described further referring to the drawings.
Embodiment
Further to illustrate that the utility model is to reach technological means and effect that above-mentioned purpose is taken, below in conjunction with
Accompanying drawing and preferred embodiment, embodiment of the present utility model, structure, feature and its effect are described in detail.Should
Work as understanding, specific embodiment described herein only to explain the utility model, is not used to limit the utility model.
Shown in reference picture 1, Fig. 1 is the overall structure diagram of the utility model multimode three-passband filter.In this implementation
Example in, the utility model proposes three-passband filter 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.The four moulds defect formula resonator 1 etch PCB be situated between
A surface (such as lower surface, with reference to shown in Fig. 2) for scutum 10, the surface with not etching four mould defects formula resonator 1 it is surplus
Remaining part point 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 in PCB dielectric-slabs respectively
10 another surface (such as upper surface, with reference to shown in Fig. 5).The PCB dielectric-slabs 10 are a kind of metal medium plate, and the PCB is situated between
The thickness of scutum 10 is 0.79mm, and dielectric constant is 2.34.
With reference to shown in Fig. 2, Fig. 2 be four mould defects in the utility model three-passband filter formula resonator etching exist
The structural representation of PCB dielectric-slab bottom surfaces.The four moulds defect formula resonator 1 have up and down and left and right be symmetrical knot
Structure so that the four moulds defect formula resonator 1 there are four modes of resonance simultaneously, the resonant frequency of each mode of resonance has good
Good adjustability.The four moulds defect formula resonator 1 shape and structure be described in detail below：The four moulds defect formula it is humorous
Shake device 1 shape on the four moulds defect formula resonator 1 the first central axis ab it is symmetrical, and on the four moulds defect
Second central axis cd of formula resonator 1 is symmetrical, and the first central axis ab is mutually perpendicular to the second central axis cd.In this implementation
Example in, the four moulds defect formula resonator 1 include the first resonant element 11 and four the second resonant elements 12.Wherein, first
Resonant element 11 is shaped as H-shaped or the H-shaped that is defined, and quasi- H-shaped defined in the present embodiment is the shape for being similar to H-shaped on the whole
Shape.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 whole
It is similar to L-shaped, a free end (one end not being connected with the first resonant element 11) bent less one for such as L-shaped on body
Section, 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
It can be bent again at least one times for the free end (one end not being connected with the first resonant element 11) that is similar to U-shaped on the whole,
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 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 connects respectively
Connect 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
The center bending of formula resonator 1, the number of times of the bending is twice.The L-shaped of four the second resonant elements 12, quasi- L-shaped, U-shaped or
The surrounding of with being open four mould defects of the equal direction formula resonator 1 of quasi- U-shaped.Two positioned at the first central axis ab homonymies are second humorous
Shake and be separated with interval 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 extended 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 in the utility model three-passband filter
Resonator etches the structural representation in PCB dielectric-slabs upper surface.In the present embodiment, the micro-strip step electric impedance resonator 4
Shape it 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.It is described
Spacing between micro-strip step electric impedance resonator 4 and two microstrip feed lines 3 is preferably g=0.3mm.The micro-strip stepped impedance is humorous
The device 4 that shakes includes two the 3rd resonant elements 41 and the 4th resonant element 42.3rd resonant element 41 be shaped as L-shaped or
Quasi- L-shaped, 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 the 3rd resonant element 41 is two, and the end spacing of two the 3rd resonant elements 41 is equal to two microstrip feed lines 3
Spacing between end, is d2, the spacing is d2Less than 5mm, the present embodiment is preferably d2=1.6mm.Two the 3rd resonance lists
First 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 utility model is based on three passband filter structures, by the mould defect of micro-strip step electric impedance resonator (MSIR) 4 and four
The three passbands filtering that the mode that formula resonator (QMDGSR) 1, two microstrip feed lines 3 are combined is constituted, with very high passband selection
Property.The 3rd resonant element 41 for constituting micro-strip step electric impedance resonator 4 is different with the width of the microstrip line of the 4th resonant element 42,
Counterpart impedance is Z2And Z1, in order to simplify design, this two parts has identical electrical length, i.e. θ0.The of the three-passband filter
One mode of resonance (m1) is in the first passband；Second mode of resonance (m2), three modes of resonance (m3) are in the second passband；4th is humorous
Pattern of shaking (m4) is in the 3rd passband.By the base time mode of resonance and single order resonance frequency that adjust micro-strip step electric impedance resonator 4
Rate, can produce two other mode of resonance, i.e. the 5th mode of resonance (R1) and the six or five mode of resonance (R2), and be located at respectively
In first 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 resonance
Pattern R2 frequency (fR1, fR2) adjust the 5th mode of resonance R1 and the first mode of resonance m1 resonant frequency spacing, Yi Ji
Four mode of resonance m4 and the 6th mode of resonance R2 resonant frequency spacing, can effectively change the band of the first passband and the 3rd passband
Width, wherein fR1And fR2It can be calculated and obtained by equation below (1) and (2).
tan2θ0=K, K=Z2/Z1 (1)
The utility model is by adjusting fR1And fR2, can separately design out the first, the 3rd passband with narrower bandwidth with
And two class three-passband filters of the first, the 3rd passband of wider bandwidth.As shown in figure 8, for narrower bandwidth the first, the 3rd
The S parameter schematic diagram of the three-passband filter of passband.As shown in figure 9, being three passbands with wider bandwidth first, the 3rd passband
The S parameter schematic diagram of wave filter.Wherein, S11Represent two-port P1And P2Reflectance factor, S21Represent two-port P1And P2Between
Transmission coefficient.
In the utility model, due to the end distance of two microstrip feed lines 3 lean on it is close (between two microstrip feed lines 3
Spacing d2For 0-5mm), therefore form the feed structure that source carries coupling.Because the source carries the formation of coupling, the feed structure
Four transmission zeros (TZ1, TZ2, TZ3, TZ4) can be produced, so as to form three passband filter structures.It should be noted that
As long as the end distance of two microstrip feed lines 3 is less than 5mm, three pass-band performances can be formed.Specific embodiment of the utility model
d2Preferably 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
Stiffness of coupling difference between micro-strip step electric impedance resonator 4, the three-passband filter in the first passband lower limiting frequency and
Threeway band upper cut off frequency generates two transmission zeros (TZ5, TZ6) again, so as to substantially increase the three-passband filter
Passband selectivity.
As shown in Figure 10, Figure 10 shows for the measurement result of the S parameter of the utility model three-passband filter with simulation result
It is intended to.It can be seen from fig. 10 that due to the three-passband filter have 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, upper stopband maximum suppression
Degree also has higher belt resistance inhibitor system more than 43.9dB.
Multimode three-passband filter described in the utility model, based on four mould defects formula resonator and micro-strip stepped impedance it is humorous
The device that shakes is combined, and not only processes simple with low cost, and can produce three basic transmission passbands, forms the filtering of three passbands
Structure, therefore be widely used in broadband and multi-frequency band radio-frequency microwave communication.Due to four mould defects formula resonator be feedback
Slot and obtain on level face, therefore extra resonance body need not be increased, with the function of reducing three-passband filter size.Due to
Two microstrip feed lines and four mould defects ground stiffness of coupling difference between formula resonator and micro-strip step electric impedance resonator, the threeway
Band filter generates two transmission zeros again in the first passband lower limiting frequency and threeway band upper cut off frequency, thus this three
Pass filter has altogether six transmission zeros, with high passband selectivity, and also has higher belt resistance inhibitor system.
Preferred embodiment of the present utility model is these are only, the scope of the claims of the present utility model is not thereby limited, it is every
Equivalent structure or the equivalent function conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical fields, are similarly included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of multimode three-passband filter, including PCB dielectric-slabs, it is characterised in that the three-passband filter also includes four moulds
Defect ground formula resonator, two microstrip feed lines and micro-strip step electric impedance resonator, the four moulds defect formula resonator etching exist
One surface of PCB dielectric-slabs, two microstrip feed lines and micro-strip step electric impedance resonator etch another table in PCB dielectric-slabs respectively
Face, 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
It is separated with interval between member, first resonant element is shaped as H-shaped or the H-shaped that is defined, the second resonant element is shaped as L
Shape, quasi- L-shaped, U-shaped or the U-shaped that is defined；
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 3rd resonant element is shaped as L-shaped or quasi- L-shaped, the convex for being shaped as opening of the 4th resonant element, two the 3rd
The end spacing of resonant element is equal to the spacing between two microstrip feed line ends, and two the 3rd resonant elements are close to the first center
Openend of two ends of axis respectively with the 4th resonant element is connected.
2. multimode three-passband filter as claimed in claim 1, it is characterised in that one end connection second of first line of rabbet joint
The middle part of the line of rabbet joint, the other end of first line of rabbet joint connects the middle part of third slot line, and second line of rabbet joint and third slot line are parallel and with the
One line of rabbet joint is vertical；One end of 4th line of rabbet joint connects second line of rabbet joint or the other end of third slot line, and prolongs to the first central axis
Stretch, the other end of the 4th line of rabbet joint connects one end of the 5th line of rabbet joint, the other end of the 5th line of rabbet joint connect one end of the 6th line of rabbet joint and to
Second central axis extends, and 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. multimode three-passband filter as claimed in claim 1, it is characterised in that part first line of rabbet joint, positioned at first
Second line of rabbet joint or third slot line of line of rabbet joint side, the 4th groove in same second resonant element of the first line of rabbet joint side
PCB dielectric-slabs the first pole plate of formation that line, the 5th line of rabbet joint and the 6th line of rabbet joint are surrounded, first pole plate is shaped as L-shaped, the first pole
The quantity of plate is two, and two the first pole plates are on the first central axis axial symmetry.
4. multimode three-passband filter as claimed in claim 1, it is characterised in that part first line of rabbet joint, positioned at first
Second line of rabbet joint or third slot line of line of rabbet joint opposite side, the in same second resonant element of the first line of rabbet joint opposite side the 4th
PCB dielectric-slabs the second pole plate of formation that the line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint are surrounded, the second pole plate is shaped as L-shaped, the second pole
The quantity of plate is two, and two the second pole plates are on the first central axis axial symmetry.
5. multimode three-passband filter as claimed in claim 1, it is characterised in that the length of first 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 3rd groove
The width of line is 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
Spend for 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 distance between two article of the 5th line of rabbet joint of one 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.
6. multimode three-passband filter as claimed in claim 1, it is characterised in that it is micro- that the 3rd resonant element includes first
Band line and the second microstrip line, one end of the first microstrip line are connected to one end of the second microstrip line, and the length of the first microstrip line is more than
The width of the length of second microstrip line, the first microstrip line and the second microstrip line is identical；It is micro- that 4th resonant element includes the 3rd
Band line, two the 4th microstrip lines, two the 5th microstrip lines and two the 6th microstrip lines, the two ends of the 3rd microstrip line are connected respectively
One end of two the 4th microstrip lines, the other end of two the 4th microstrip lines connects one end of two the 5th microstrip lines, two respectively
The other end of 5th microstrip line connects one end of two the 6th microstrip lines respectively, and one end of two the 6th microstrip lines is humorous as the 4th
Shake the openend of unit.
7. multimode three-passband filter as claimed in claim 6, it is characterised in that the 3rd micro-strip of the 4th resonant element
Line, the 4th microstrip line, the width all same of the 5th microstrip line and the 6th microstrip line, and less than the first micro-strip of the 3rd resonant element
The width of line and the second microstrip line.
8. multimode three-passband filter as claimed in claim 6, it is characterised in that the length L of first microstrip line6=
11.4mm, the length L of the second microstrip line7The width W of=6.4mm, the first microstrip line and the second microstrip line6=1.0mm, second is micro-
It is g=0.3mm with the spacing between line and two microstrip feed lines；3rd microstrip line, the 4th microstrip line, the 5th microstrip line and
The width of 6th microstrip line is W8=0.4mm, the length L of the 3rd 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 the 6th microstrip line is L8=1.5mm.
9. multimode three-passband filter as claimed in claim 1, it is characterised in that two microstrip feed lines are respectively with first
The position of two article of the 4th line of rabbet joint of line of rabbet joint homonymy is corresponding and symmetrical on the first central axis, and the width of microstrip feed line is than the 4th groove
The width of line is wide, and the end of the microstrip feed line is ended close at the 5th line of rabbet joint, each microstrip feed line in second
The distance at the edge of heart axis to the edge away from the second central axis of the 4th line of rabbet joint is d1=1.35mm.
10. multimode three-passband filter as claimed in claim 9, it is characterised in that between two microstrip feed line ends
Spacing d2=1.6mm, the width of each microstrip feed line is W0=2.34mm, the impedance of each microstrip feed line is 50 Ω.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265179.2U CN206602159U (en) | 2017-03-18 | 2017-03-18 | Multimode three-passband filter |
| PCT/CN2017/107204 WO2018171182A1 (en) | 2017-03-18 | 2017-10-21 | Multimode triple-passband filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265179.2U CN206602159U (en) | 2017-03-18 | 2017-03-18 | Multimode three-passband filter |
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| Publication Number | Publication Date |
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| CN206602159U true CN206602159U (en) | 2017-10-31 |
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ID=60144977
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720265179.2U Expired - Fee Related CN206602159U (en) | 2017-03-18 | 2017-03-18 | Multimode three-passband filter |
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| Country | Link |
|---|---|
| CN (1) | CN206602159U (en) |
| WO (1) | WO2018171182A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953146A (en) * | 2017-03-18 | 2017-07-14 | 深圳市景程信息科技有限公司 | Based on four mould defects formula resonator three-passband filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3754780B1 (en) | 2019-06-17 | 2022-07-27 | Carrier Corporation | A microstrip dc block |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100691472B1 (en) * | 2006-02-03 | 2007-03-12 | 삼성전자주식회사 | Dc block with band-notch characteristic using a defected ground structure |
| CN101867074A (en) * | 2010-05-04 | 2010-10-20 | 华东交通大学 | Broadband filter based on defect ground plane integrated waveguide (DGW) structure |
| CN202094255U (en) * | 2011-06-10 | 2011-12-28 | 河海大学常州校区 | Triple-band band-pass filter based on hairpin resonator |
| CN202550040U (en) * | 2011-12-10 | 2012-11-21 | 哈尔滨飞羽科技有限公司 | Dual-band micro-strip filter suitable for wireless local area network |
| CN203180023U (en) * | 2012-12-13 | 2013-09-04 | 哈尔滨网腾科技开发有限公司 | Three-passband WiMAX micro-strip filter capable of being applied to wireless local area network |
| CN105742768A (en) * | 2014-11-28 | 2016-07-06 | 青岛海尔电子有限公司 | Band-pass filter, high-order band-pass filter and performance analysis method |
| CN105990632B (en) * | 2015-01-28 | 2019-03-08 | 青岛海尔电子有限公司 | A kind of three-passband filter |
| CN106953146B (en) * | 2017-03-18 | 2019-03-26 | 深圳市景程信息科技有限公司 | Based on four mould defects the three-passband filter of formula resonator |
-
2017
- 2017-03-18 CN CN201720265179.2U patent/CN206602159U/en not_active Expired - Fee Related
- 2017-10-21 WO PCT/CN2017/107204 patent/WO2018171182A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953146A (en) * | 2017-03-18 | 2017-07-14 | 深圳市景程信息科技有限公司 | Based on four mould defects formula resonator three-passband filter |
| CN106953146B (en) * | 2017-03-18 | 2019-03-26 | 深圳市景程信息科技有限公司 | Based on four mould defects the three-passband filter of formula resonator |
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| WO2018171182A1 (en) | 2018-09-27 |
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