CN107026302A - The three passband filter structures with four transmission zeros - Google Patents
The three passband filter structures with four transmission zeros Download PDFInfo
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- CN107026302A CN107026302A CN201710162727.3A CN201710162727A CN107026302A CN 107026302 A CN107026302 A CN 107026302A CN 201710162727 A CN201710162727 A CN 201710162727A CN 107026302 A CN107026302 A CN 107026302A
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- line
- rabbet joint
- slabs
- central axis
- pcb dielectric
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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
Abstract
The present invention discloses a kind of three passband filter structures with four transmission zeros, including PCB dielectric-slabs, four mould defects ground formula resonator and two microstrip feed lines；Four mould defects formula resonator include the first resonant element and four the second resonant elements；First resonant element is made up of first line of rabbet joint, second line of rabbet joint and third slot line, 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；The front end of microstrip feed line extends to the edge of PCB dielectric-slabs, the end of microstrip feed line extends to the first central axis and terminated from the remaining silent of the second resonant element from positioned at two article of the 4th line of rabbet joint of the first line of rabbet joint homonymy, two microstrip feed lines are symmetrical on the first central axis, two microstrip feed line end spacing carry the feed structure of coupling close to formation source, and the feed structure produces four transmission zero three passband filter structures of formation.The three passband filter structures of the present invention produce three basic transmission passbands, and with higher passband selectivity, and physical dimension is small.
Description
Technical field
Filtered the present invention relates to frequency microwave communication technical field, more particularly to a kind of three passbands with four transmission zeros
Wave structure.
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.The passband selectivity of bandpass filter of the prior art is not high,
The demand of modern microwave communication system can not be fully met.Although multimode resonator has been suggested, simply apply to broadband
The design of wave filter.And the present invention employs new source based on QMDGSR and carries couple feed method, propose be based on first
The QMDGSR less three passbands filter structure of size.Give simultaneously and demonstrate its equivalent-circuit model, be deduced this
The zero point computational methods of three passband filter structures.
The content of the invention
The main object of the present invention provides a kind of three passband filter structures with four transmission zeros, not only processes simple
It is with low cost, and three basic transmission passbands are produced, with higher passband selectivity, it is not necessary to increase extra resonance body,
Reduce physical dimension.
To achieve the above object, the invention provides a kind of three passband filter structures with four transmission zeros, including
PCB dielectric-slabs, four mould defects ground formula resonator and two microstrip feed lines, the four moulds defect formula resonator etching be situated between in PCB
One surface of scutum, two microstrip feed lines are arranged 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 resonance list
Member is made up of first line of rabbet joint, second line of rabbet joint and third slot line, and 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
Constitute；
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, and the feed structure produces the three passbands filtering of four transmission zeros
Structure；
The first inductance L of part PCB dielectric-slabs formation between first line of rabbet joint and the 6th line of rabbet jointS, the first inductance LSNumber
Measure as four, positioned at two the first inductance L of formation respectively of the first line of rabbet joint homonymySTwo PCB dielectric-slabs connection, positioned at first
The first inductance of formation L of central axis homonymySPCB dielectric-slabs with formed the first pole plate PCB dielectric-slabs connect, positioned at first
The first inductance of formation L of central axis homonymySPCB dielectric-slabs with formed the second pole plate PCB dielectric-slabs connect；
The second inductance L of PCB dielectric-slabs formation between two article of the 5th line of rabbet joint of the first line of rabbet joint homonymyP, the second inductance LP
Quantity be two, positioned at the second inductance of formation L of the first line of rabbet joint homonymyPPCB dielectric-slabs and respectively formed two first electricity
Feel LSTwo PCB dielectric-slabs connection；
The four moulds defect formula resonator periphery PCB dielectric-slabs formation radio frequency ground level, form radio frequency ground level
The second inductance L of PCB dielectric-slabs and formationPPCB dielectric-slabs connection, positioned at the first pole plate and second of the first central axis homonymy
The first electric capacity C of pole plate formationM, the second electric capacity C is formed between the first pole plate or the second pole plate and metal groundC；
PCB dielectric-slabs formation source between the space from end of two microstrip feed lines carries coupled capacitor CS, each micro-
PCB dielectric-slab formation feed coupled capacitor C of ribbon feeder and four mould the defects ground between formula resonatorP, feed coupled capacitor CPNumber
Measure as two, positioned at PCB dielectric-slabs and two first electricity of formation respectively on the downside of first line of rabbet joint of each microstrip feed line
Feel LSPCB dielectric-slabs connection.
It is preferred that, when first central axis in strange mould equivalent to short circuit when, then the second inductance LPIt is invalid；When described
First central axis in strange mould equivalent to open circuit when, then form the second inductance LPPCB dielectric-slabs equivalent to being cut into two
Half, the second inductance L when the first central axis is equivalent to open circuitPTwice of size, now the second inductance LPSize be 2LP。
It is preferred that, when second central axis in strange mould equivalent to short circuit when, then the second central axis is equivalent to short
The first electric capacity C during roadMSize be the first original electric capacity CMTwice of size, now the first electric capacity CMSize be
2CM；When second central axis in even mould equivalent to open circuit when, then now the first electric capacity CMIn there is no electric charge, the first electric capacity
CM=0.
It is preferred that, the corresponding resonant frequency of four transmission zeros is respectively fTZ1、fTZ2、fTZ3And fTZ4, this four biographies
The resonant frequency f of defeated zero pointTZ1、fTZ2、fTZ3And fTZ4Calculation formula it is as follows：
Wherein, Yine1 represents even mould admittance, and Yino1 represents Qi Mo admittance.
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 connection the of 4th line of rabbet joint
The other end of two line of rabbet joint or third slot line, and extend to the first central axis, the other end of the 4th line of rabbet joint connects the 5th line of rabbet joint
One end, one end that the other end of the 5th line of rabbet joint connects the 6th line of rabbet joint simultaneously extends to the second central axis, the 4th line of rabbet joint and the 6th
The line of rabbet joint 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, 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 ends2For 1.6mm, the width W of each microstrip feed line0
It is 2.34mm, the impedance of each microstrip feed line is 50 Ω.
Compared to prior art, the three passband filter structures with four transmission zeros of the present invention not only process letter
It is single with low cost, and three basic transmission passbands can be produced, form three passband filter structures, therefore three passband filter structures
It is widely used in broadband and multi-frequency band radio-frequency microwave communication.Due to four mould defects formula resonator be to be opened on feeding plane
Groove is obtained, therefore need not increase extra resonance body, is filtered with three passbands with four transmission zeros of the present invention are reduced
The function of wave structure size.
Brief description of the drawings
Fig. 1 is the overall structure diagram for the three passband filter structures that the present invention has four transmission zeros；
Fig. 2 be four mould defects in three passbands filter structure of the 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 structure of the two microstrip feed lines etching in three passbands filter structure of the invention in PCB dielectric-slabs upper surface
Schematic diagram；
Fig. 6 is the equivalent-circuit model for the three passband filter structures that the present invention has four transmission zeros；
Fig. 7 is the parity mode equivalent circuit for the three passband filter structures that the present invention has four transmission zeros；
Fig. 8 is that the PCB emulation for the three passband filter structures that the present invention has four transmission zeros is shown with Simulation results
It is intended to；
Fig. 9 is that influences of the spacing d2 to four transmission zeros TZ1, TZ2, TZ3, TZ4 between two microstrip feed lines is illustrated
Figure；
Figure 10 be four mould defects formula resonator parity mode equivalent-circuit model；
Figure 11 is the first electric capacity CMInfluence and four mould defects to four transmission zeros formula resonator in fTZ1And fTZ4
CURRENT DISTRIBUTION during frequency；
Figure 12 is the simplification circuit model and its corresponding parity mode equivalent circuit diagram of three passband filter structures.
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 is the overall structure signal for the three passband filter structures that the present invention has four transmission zeros
Figure.In the present embodiment, three passbands filter structure proposed by the present invention include four mould defects formula resonator (QMDGSR) 1, penetrate
Frequency ground level 2 and two microstrip feed lines 3.The four moulds defect formula resonator 1 etch on a surface of PCB dielectric-slabs 10
(such as lower surface, with reference to shown in Fig. 2), the remainder of the surface with not etching four mould defects formula resonator 1 is referred to as penetrating
Frequency ground level 2, two microstrip feed lines 3 are separately positioned on another surface (such as upper surface, with reference to Fig. 5 institutes of PCB dielectric-slabs 10
Show).The PCB dielectric-slabs 10 are a kind of metal medium plate, and 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 formula resonator etching PCB dielectric-slab bottom surfaces structural representation.
In the present embodiment, the four moulds defect formula resonator 1 have up and down and left and right be symmetrical structure so that four mould lack
Fall into ground formula resonator 1 has four modes of resonance simultaneously, and the resonant frequency of each mode of resonance has good adjustability.It is described
Four mould defects formula resonator 1 shape and structure be described in detail below：The four moulds defect 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 resonator 1 second
Central axis cd is symmetrical, and the first central axis ab is mutually perpendicular to the second central axis cd.In the present embodiment, four mould lacks
Falling into ground formula resonator 1 includes the first resonant element 11 and four the second resonant elements 12.Wherein, the shape of the first resonant element 11
For H-shaped or the H-shaped that is defined, 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
Be shaped as L-shaped, quasi- L-shaped, U-shaped or the U-shaped that is defined, the quasi- L-shaped defined in the present embodiment is is similar to L-shaped on the whole, for example
Bent less one section an of free end (one end not being connected with the first resonant element 11) for L-shaped, this is very small one section
Length length on side where the free end for it is shorter.Quasi- U-shaped defined in this implementation is to be similar to U-shaped on the whole
A free end (one end not being connected with the first resonant element 11) can bend again at least one times, it is curved after each bending
The length for rolling over end is shorter for the length on side where the free end, so that still it is similar to U-shaped on the whole, will not
Significantly affect the performance of the second resonant element 12.One end of four the second resonant elements 12 connects the first resonant element 11 respectively
Four ends.Each second resonant element 12 extend to the first central axis ab and to four mould defects formula resonator 1 center it is curved
Folding, the number of times of the bending is twice.The equal direction of L-shaped, quasi- L-shaped, the opening of U-shaped or quasi- U-shaped of four the second resonant elements 12
Four mould defects formula resonator 1 surrounding.It is separated between two the second resonant elements 12 of the first central axis ab homonymies
Interval.
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；
Etched as shown in figure 5, Fig. 5 is two microstrip feed lines in three passbands filter structure of the invention on PCB dielectric-slabs
The structural representation on surface.Due to two microstrip feed lines 3 be separately positioned on relative to four mould defects formula resonator 1 set
On another surface of PCB dielectric-slabs 10, thus two microstrip feed lines 3 on another surface of PCB dielectric-slabs 10 to four mould defects
Ground formula resonator 1 is fed.In the present embodiment, the front end of two microstrip feed lines 3 extends respectively into the side of PCB dielectric-slabs 10
Two port (first port P of edge formation1With second port P2), the end of microstrip feed line 3 is respectively from same positioned at first line of rabbet joint 111
Two article of the 4th line of rabbet joint 124 of side extends to the first central axis ab and terminates the L-shaped, quasi- L-shaped, U close to the second resonant element 12
The place of remaining silent of shape or quasi- U-shaped, two microstrip feed lines 3 are symmetrical on the first central axis ab.It is emphasized that two micro-strips
Feeder line 3 is simultaneously same positioned at first line of rabbet joint 111 on two article of the 4th line of rabbet joint 124 of the same upside of first line of rabbet joint 111, or simultaneously
One downside two article of the 4th line of rabbet joint 124 on, rather than positioned at four mould defects formula resonator 1 diagonal on two article of the 4th groove
On line 124.
In the present embodiment, the position pair of two article of the 4th line of rabbet joint 124 of two homonymies of 3 and first line of rabbet joint of microstrip feed line 111
Should, and it is symmetrical on 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 microstrip feed line
4th line of rabbet joint 124 of 3 covering parts.The width W of every microstrip feed line 30Preferably 2.34mm, the other end of microstrip feed line 3 is whole
Terminate at the 5th line of rabbet joint 125, do not touch the 5th line of rabbet joint 125.It is preferred that, the impedance of each microstrip feed line 3 is
50 Ω, the close second central axis cd of each microstrip feed line 3 edge are to the 4th line of rabbet joint 124 away from the second central axis
The distance at cd edge is d1, the spacing between two microstrip feed lines 3 is close, and the spacing defined between two microstrip feed lines 3 is
d2, the spacing is d2It is preferably d in the present embodiment less than 5mm (i.e. value in the range of 0-5mm)2=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.In the present embodiment, table 1 below has the three passbands filtering of four transmission zeros for the present invention
Parameters of structural dimension：
Table 1：The three passband filter structure dimensional parameters with four transmission zeros
| Parameter | mm | Parameter | mm | Parameter | mm | Parameter | mm |
| W0 | 2.34 | W1 | 0.68 | W2 | 0.3 | W3 | 0.3 |
| d1 | 1.35 | d2 | 1.6 | S1 | 0.8 | S2 | 2.27 |
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 are produced, so as to form three passbands filter structure of the present invention.As long as it should be noted that two micro-
The end distance of ribbon feeder 3 is less than 5mm, can form three pass-band performances.The specific embodiment d of the present invention2Preferably 1.6mm,
Preferable three pass-band performance can be obtained.
As shown in fig. 6, Fig. 6 is the equivalent-circuit model for the three passband filter structures that the present invention has four transmission zeros.
By above-mentioned structure design, the present invention use odd even film theory come for four mould defects formula resonator 1 extract equivalent circuit.
Specific equivalent circuit description is as follows：
The first inductance L of PCB dielectric-slabs formation between part first line of rabbet joint 111 and the 6th line of rabbet joint 126S, due to there is four
Second resonant element 12, therefore the first inductance LSQuantity be four.Positioned at the formation respectively two of the homonymy of first line of rabbet joint 111
One inductance LSTwo PCB dielectric-slabs connection.Positioned at the first inductance of formation L of the first central axis ab homonymiesSPCB dielectric-slabs
Connected with the PCB dielectric-slabs for forming the first pole plate.Positioned at the first inductance of formation L of the first central axis ab homonymiesSPCB media
Plate is connected with the PCB dielectric-slabs for forming the second pole plate 32.
The second inductance L of PCB dielectric-slabs formation between two article of the 5th line of rabbet joint 125 of the homonymy of first line of rabbet joint 111P.By
Respectively there are two article of the 5th line of rabbet joint 125, therefore the second inductance L in the both sides of first line of rabbet joint 111PQuantity be two.Positioned at the first groove
The second inductance of formation L of the homonymy of line 111PPCB dielectric-slabs and respectively formed two the first inductance LSTwo PCB dielectric-slabs connect
Lead to and formed the shape of T-shaped.
The four moulds defect the periphery of formula resonator 1 PCB dielectric-slabs formation radio frequency ground level 2, form radio frequency ground level 2
PCB dielectric-slabs and formed the second inductance LPPCB dielectric-slabs connection.Positioned at the first pole plate 31 of the first central axis ab homonymies
With the first electric capacity C of the second pole plate 32 formationM, second is formed between the first pole plate 31 or the second pole plate 32 and metal ground 11
Electric capacity CC。
PCB dielectric-slabs formation source between two space from ends of microstrip feed line 3 carries coupled capacitor CS, each microstrip feed line
3 and four PCB dielectric-slab formation feed coupled capacitor C of the mould defect ground between formula resonator (QMDGSR) 1P.Due to have two it is micro-
Ribbon feeder 3, therefore form two feed coupled capacitor CP.PCB dielectric-slabs positioned at each microstrip feed line 3 are with being located at the first groove
Two the first inductance L of formation respectively of the downside of line 111STwo PCB dielectric-slabs connection.
As shown in fig. 7, for the present invention based on four mould defects formula resonator 1 three passband filter structures parity mode it is equivalent
Circuit.Wherein, Fig. 7 (a) is the strange mould equivalent circuit of three passband filter structures, and Fig. 7 (b) is even mould of three passband filter structures etc.
Imitate circuit.Wherein, the first central axis ab can be regarded as a virtual ground plane equivalent to short circuit in strange mould.When
When one central axis ab is equivalent to short circuit, then electric current will not pass through the second inductance LP, then the second inductance LPIt is invalid.First central shaft
Line ab is in even mould equivalent to open circuit.When the first central axis ab is equivalent to open circuit, then the second inductance L is formedPPCB media
Plate is equivalent to being cut into two halves.Because the size of inductance and the thickness of metal are relevant, thus the first central axis ab equivalent to
The second inductance L during open circuitPTwice of size, i.e., now the second inductance LPSize be 2LP.Likewise, the second central axis
Cd short circuits, equivalent to short circuit, can be regarded as a virtual ground plane in strange mould.When the second central axis cd is short-circuit, then
First electric capacity CMThe distance between two-stage plate equivalent to shortening half.The distance between size and pole plate due to electric capacity have
Close, thus the second central axis cd equivalent to short circuit when the first electric capacity CMSize be the first original electric capacity CMSize
Twice, i.e., now the first electric capacity CMSize be 2CM.Second central axis cd in even mould equivalent to open circuit, then the first electric capacity CM
In there is no electric charge, the first electric capacity CM=0.
With reference to shown in Fig. 8, Fig. 8 for the present invention based on four mould defects formula resonator 1 three passband filter structures PCB imitate
Very with Simulation results schematic diagram.Wherein, the former device value of circuit simulation is CM=0.6pF, CC=1.62pF, CP=1.5pF,
CS=0.2pF, LP=1.1nH, LS=1.27nH.Wherein S11Represent two port P1And P2Reflectance factor, S21Represent two ends
Mouth P1And P2Between transmission coefficient.As can be seen from Figure 8, PCB emulation has very high registration with circuit simulation, therefore
The equivalent-circuit model of three passband filter structures of the invention has higher accuracy.Because feed structure is using source load coupling side
Formula, the three passbands filter structure generates four transmission zeros, i.e. TZ1, TZ2, TZ3, TZ4, so as to form three passbands.
As shown in figure 9, Fig. 9 is the spacing d between two microstrip feed lines 32To four transmission zeros TZ1, TZ2, TZ3, TZ4
Influence schematic diagram.In the present embodiment, in using the spacing d2 between two microstrip feed lines 3 and being 0-5mm, the present embodiment
D2Four transmission zeros TZ1, TZ2, TZ3, TZ4 influence are separately verified using 1.8mm, 0.7mm and 0.2mm.From Fig. 9
As can be seen that the spacing d between two microstrip feed lines 32TZ1 and TZ4 is only influenceed, without influenceing TZ2 and TZ3, therefore can be true
It is to carry coupling by source to produce to determine TZ1 and TZ4, and TZ2 and TZ3 are the internal circuit generations by three passband filter structures.
In order to calculate TZ2 resonant frequency fTZ2With TZ3 resonant frequency fTZ3, it is of the invention to be analyzed with even odd mode theory
The equivalent circuit of the three passbands filter structure.As shown in Figure 1, four mould defects formula resonator 1 have the axisymmetric feed in left and right
Structure, and it is symmetrical on the first central axis ab, therefore four mould defects can be obtained the parity mode equivalent circuit mould of formula resonator 1
Type, such as Figure 10 (a) and (b) are shown.Wherein, 10 (a) be four mould defects formula resonator 1 strange mould equivalent-circuit model；10(b)
For four mould defects formula resonator 1 even mould equivalent-circuit model.From four mould defects the CURRENT DISTRIBUTION of formula resonator 1 can
Go out, in fTZ2During frequency, electric current can by four mould defects the upper end of formula resonator 1 flow into radio frequency ground level 2, form a ground connection logical
Road, causes electric current to cannot flow into another port, so as to produce TZ2.In fTZ3During frequency, four mould defects formula resonator 1 it is upper
Side form second or so transmission radio frequency path, and this structure four mould defects formula resonator 1 the latter half in itself
With a radio frequency transmission path, therefore the two paths form signal cancellation, so as to produce TZ3.The structure in even mould and
Admittance calculation formula (Y under the conditions of strange mouldine1,Yino1) respectively as shown in (1) and (2) formula：
Wherein, Yine1 represents even mould admittance, and Yino1 represents Qi Mo admittance, by solving equation Yine1=Yino1, can obtain
TZ2 resonant frequency fTZ2With TZ3 resonant frequency fTZ3, as shown in (3) formula.
In order to calculate TZ1 and TZ4 resonant frequency, equivalent circuit of the three-passband filter of the present invention under the conditions of parity mode
, similarly, can be by solving equation Y as shown in Fig. 7 (a) and (b)ine2=Yino2To obtain corresponding resonant frequency.But now circuit
It is very complicated, therefore the present invention proposes an efficient computational methods.It is the first electric capacity C as shown in figure 11MTo four transmission zero
Point influence and four mould defects formula resonator 1 in fTZ1And fTZ4CURRENT DISTRIBUTION during frequency.It can be seen that the first electric capacity CM
Have little influence on fTZ1And fTZ4, and in fTZ1And fTZ4Electric current is with being mainly distributed on four mould defects under formula resonator 1 during frequency
Half part.Therefore, in fTZ1And fTZ4During frequency, the circuit model of the three passbands filter structure can be reduced to such as Figure 12 (a) institutes
Show, shown in its corresponding parity mode equivalent circuit such as Figure 12 (b).Parity mode equivalent circuit now is greatly simplified, can be with
By solving equation Yine3=Yino3To obtain TZ1 resonant frequency fTZ1With TZ4 resonant frequency fTZ4, as shown in (4) formula：
In order to verify fTZ1And fTZ4Accuracy, table 2 below lists fTZ1And fTZ4Calculated value is in different capacitance CSCondition
The contrast of lower and simulation value, it can be seen that result of calculation has very high registration with simulation result, so as to demonstrate fTZ1With
fTZ4Accuracy.
Table 2fTZ1And fTZ4Simulation result and result of calculation contrast table
Wherein, Sim.fTZ1Represent fTZ1Simulation result, Cal.fTZ1Represent fTZ1Result of calculation, Sim.fTZ4Represent fTZ4
Simulation result, Cal.fTZ4Represent fTZ4Result of calculation.
The three passband filter structures with four transmission zeros of the present invention, not only process simple with low cost, and
Three basic transmission passbands can be produced, three passband filter structures are formed, with higher passband selectivity, therefore extensively should
For in broadband and multi-frequency band radio-frequency microwave communication.Due to four mould defects formula resonator be on feeding plane slot obtain,
Therefore extra resonance body need not be increased, with reducing the function with three passband filter structure sizes of the present invention.
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 (9)
1. a kind of three passband filter structures with four transmission zeros, including PCB dielectric-slabs, four mould defects formula resonator and
Two microstrip feed lines, the four moulds defect formula resonator etching on a surface of PCB dielectric-slabs, two microstrip feed lines are arranged on
Another surface of PCB dielectric-slabs, it is characterised in that：
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；
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, and the feed structure produces three passband filter structures of four transmission zeros；
The first inductance L of part PCB dielectric-slabs formation between first line of rabbet joint and the 6th line of rabbet jointS, the first inductance LSQuantity be
Four, positioned at two the first inductance L of formation respectively of the first line of rabbet joint homonymySTwo PCB dielectric-slabs connection, positioned at the first center
The first inductance of formation L of axis homonymySPCB dielectric-slabs with formed the first pole plate PCB dielectric-slabs connect, positioned at the first center
The first inductance of formation L of axis homonymySPCB dielectric-slabs with formed the second pole plate PCB dielectric-slabs connect；
The second inductance L of PCB dielectric-slabs formation between two article of the 5th line of rabbet joint of the first line of rabbet joint homonymyP, the second inductance LPNumber
Measure as two, positioned at the second inductance of formation L of the first line of rabbet joint homonymyPPCB dielectric-slabs and respectively formed two the first inductance LS's
Two PCB dielectric-slabs connections；
The four moulds defect formula resonator periphery PCB dielectric-slabs formation radio frequency ground level, formed radio frequency ground level PCB be situated between
The second inductance L of scutum and formationPPCB dielectric-slabs connection, positioned at the first pole plate and the second pole plate of the first central axis homonymy
Form the first electric capacity CM, the second electric capacity C is formed between the first pole plate or the second pole plate and metal groundC；
PCB dielectric-slabs formation source between the space from end of two microstrip feed lines carries coupled capacitor CS, each microstrip feed line
PCB dielectric-slabs formation feed coupled capacitor C with four mould defects between formula resonatorP, feed coupled capacitor CPQuantity be two
It is individual, positioned at PCB dielectric-slabs and two the first inductance L of formation respectively on the downside of first line of rabbet joint of each microstrip feed lineS's
PCB dielectric-slabs are connected.
2. there are three passband filter structures of four transmission zeros as claimed in claim 1, it is characterised in that when described first
Central axis in strange mould equivalent to short circuit when, then the second inductance LPIt is invalid；When first central axis in strange mould quite
When open circuit, then the second inductance L is formedPPCB dielectric-slabs equivalent to two halves have been cut into, the first central axis is equivalent to open circuit
When the second inductance LPTwice of size, now the second inductance LPSize be 2LP。
3. there are three passband filter structures of four transmission zeros as claimed in claim 1, it is characterised in that when described second
Central axis in strange mould equivalent to short circuit when, then the first electric capacity C when the second central axis is equivalent to short circuitMSize be former
The the first electric capacity C comeMTwice of size, now the first electric capacity CMSize be 2CM；When the second central axis cd is in idol
When in mould equivalent to open circuit, then now the first electric capacity CMIn there is no electric charge, the first electric capacity CM=0.
4. there are three passband filter structures of four transmission zeros as claimed in claim 1, it is characterised in that four biographies
The corresponding resonant frequency of defeated zero point is respectively fTZ1、fTZ2、fTZ3And fTZ4, the resonant frequency f of four transmission zerosTZ1、fTZ2、
fTZ3And fTZ4Calculation formula it is as follows：
Wherein, Yine1 represents even mould admittance, and Yino1 represents Qi Mo admittance.
5. there are three passband filter structures of four transmission zeros as claimed in claim 1, it is characterised in that：First groove
One end of line 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 the 3rd
The line of rabbet joint 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
Connect one end of the 6th line of rabbet joint and extend 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.
6. there are three passband filter structures of four transmission zeros as claimed in claim 1, it is characterised in that：Part described
One line of rabbet joint, second line of rabbet joint or third slot line positioned at the first line of rabbet joint side, same second resonance 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 unit are surrounded, the shape of first pole plate
Shape is L-shaped, and the quantity of the first pole plate is two, and two the first pole plates are on the first central axis axial symmetry；
It is 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, another positioned at first line of rabbet joint
The PCB dielectric-slabs formation second 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 side are surrounded
Pole plate, 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 shaft bobbin
Symmetrically.
7. there are three passband filter structures of four transmission zeros as claimed in claim 1, it is characterised in that first groove
The length of line is L1=23.5mm, width are W1=0.68mm；The length of second line of rabbet joint and third slot line is L2=12mm；The
Two 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
For 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 and the 6th
The distance between line of rabbet joint is S2=2.27mm.
8. there are three passband filter structures of four transmission zeros as claimed in claim 1, it is characterised in that described two are micro-
Ribbon feeder 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-strip feedback
The width of line 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, each micro-strip
The distance at the edge close to the second central axis of feeder line to the edge away from the second central axis of the 4th line of rabbet joint is d1=
1.35mm。
9. there are three passband filter structures of four transmission zeros as claimed in claim 8, it is characterised in that described two are micro-
Spacing d between ribbon feeder end2For 1.6mm, the width W of each microstrip feed line0It is 2.34mm, each microstrip feed line
Impedance be 50 Ω.
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| CN201710162727.3A CN107026302A (en) | 2017-03-18 | 2017-03-18 | The three passband filter structures with four transmission zeros |
| PCT/CN2017/107207 WO2018171185A1 (en) | 2017-03-18 | 2017-10-21 | Triple-passband filter structure having four transmission zeros |
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| 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 |
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