CN206673066U - The passband filter structure of multimode three - Google Patents
The passband filter structure of multimode three Download PDFInfo
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- CN206673066U CN206673066U CN201720265182.4U CN201720265182U CN206673066U CN 206673066 U CN206673066 U CN 206673066U CN 201720265182 U CN201720265182 U CN 201720265182U CN 206673066 U CN206673066 U CN 206673066U
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Abstract
The utility model discloses a kind of passband filter structure of multimode three, 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；One end of four the second resonant elements connects four ends of the first resonant element respectively；The front end of microstrip feed line extends respectively into the edge of PCB dielectric-slabs, two microstrip feed lines respectively with the position correspondence of two article of the 4th line of rabbet joint of the first line of rabbet joint homonymy and symmetrical on the first central axis, the width of microstrip feed line is wider than the width of the 4th line of rabbet joint, the end of two microstrip feed lines is ended close at the 5th line of rabbet joint, the end spacing of two microstrip feed lines carries the feed structure of coupling close to formation source, and the feed structure forms four transmission zeros and forms three passband filter structures.The passband filter structure of multimode three of the present utility model produces three basic transmission passbands, has higher passband selectivity, it is not necessary to increase extra resonance body, physical dimension is small.
Description
Technical field
It the utility model is related to frequency microwave communication technical field, more particularly to a kind of passband filter structure of multimode three.
Background technology
In modern microwave communication system, bandpass filter (BPF) need to have a good selectivity, and Out-of-band rejection degree is wide
Stopband and miniaturization structure.Although traditional multimode BPF based on loaded type resonator has preferably 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 of bandpass filter of the prior art is not high, it is impossible to fully meets modern microwave and leads to
The demand of letter system.
Utility model content
Main purpose of the present utility model provides a kind of passband filter structure of multimode three, and it is cheap not only to process simple cost,
And three basic transmission passbands are produced, there is higher passband selectivity, it is not necessary to increase extra resonance body, reduce structure
Size.
To achieve the above object, the utility model provides a kind of passband filter structure of multimode three, including PCB dielectric-slabs,
Four mould defects ground formula resonator and two microstrip feed lines, the four moulds defect formula resonator etching the one of PCB dielectric-slabs
Surface, two microstrip feed lines are separately positioned on another surface of PCB dielectric-slabs, the four moulds defect the shape of formula resonator close
In the four moulds defect the first central axis of formula resonator is symmetrical, and on the four moulds defect in the second of formula resonator
Heart axisymmetrical, the first central axis are mutually perpendicular to the second central axis；
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 extends and to four mould defects the center bending of formula resonator；Positioned at two second of the first central axis homonymy
Interval is separated between resonant element；
The edge that the front end of two microstrip feed lines extends respectively into PCB dielectric-slabs forms two ports, two microstrip feed lines
Position correspondence with two article of the 4th line of rabbet joint of the first line of rabbet joint homonymy and, the width of microstrip feed line symmetrical on the first central axis respectively
The width of the line of rabbet joint of Du Bi tetra- is wide, and the end of two microstrip feed lines is ended close at the 5th line of rabbet joint, two microstrip feed line ends
Between spacing it is close, two microstrip feed lines form the feed structure that sources carry coupling, and the feed structure forms four transmission zeros
Three passband filter structures.
Preferably, 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 connect 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.
Preferably, part first line of rabbet joint, second line of rabbet joint positioned at the first line of rabbet joint side or third slot line, 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 surround
Into the first pole plate, first pole plate is shaped as L-shaped.
Preferably, part first line of rabbet joint, second line of rabbet joint positioned at the first line of rabbet joint opposite side or third slot line, be 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 surround
Plate shape is shaped as L-shaped into the second pole plate, the second pole plate.
Preferably, the length of first line of rabbet joint is L1=23.5mm, width 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 W3=0.3mm；The length of 5th line of rabbet joint is L4=2.8mm, width W3=0.3mm；6th line of rabbet joint
Length be L5=7.3mm, width 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.
Preferably, the PCB dielectric-slabs between part first line of rabbet joint and the 6th line of rabbet joint form the first inductance LS, the first electricity
Feel 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 inductance of formation L of the first central axis homonymySPCB dielectric-slabs with formed the first pole plate PCB dielectric-slabs connect,
Positioned at the first inductance of formation L of the first central axis homonymySPCB dielectric-slabs with formed the second pole plate PCB dielectric-slabs connect；
PCB dielectric-slabs between two article of the 5th line of rabbet joint of the first line of rabbet joint homonymy form the second inductance LP, 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 connect and form the shape of T-shaped.
Preferably, the four moulds defect the PCB dielectric-slabs of formula resonator periphery form radio frequency ground level, form radio frequency
The second inductance L of PCB dielectric-slabs and formation of planePPCB dielectric-slabs connection, positioned at the first pole plate of the first central axis homonymy
The first electric capacity C is formed with the second pole plateM, the second electric capacity C is formed between the first pole plate or the second pole plate and metal groundC。
Preferably, the PCB dielectric-slabs between the space from end of two microstrip feed lines form source and carry coupled capacitor CS, often
A piece microstrip feed line and four mould defects PCB dielectric-slabs between formula resonator form feed coupled capacitor CP, feed coupling electricity
Hold CPQuantity be two, positioned at PCB dielectric-slabs and formation two respectively on the downside of first line of rabbet joint of each microstrip feed line
Individual first inductance LSPCB dielectric-slabs connection.
Preferably, the edge of close second central axis of each microstrip feed line to remote second center of the 4th line of rabbet joint
The distance at the edge of axis is d1=1.35mm.
Preferably, 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 passband filter structure of multimode three described in the utility model, which realizes, not only processes simple cost
It is cheap, and three basic transmission passbands can be produced, three passband filter structures are formed, therefore be widely used in broadband and more
In the communication of frequency range frequency microwave.Due to four mould defects formula resonator is to slot to obtain on feeding plane, therefore need not be increased
Add extra resonance body, reduce the size of the passband filter structure of multimode three described in the utility model.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the passband filter structure of the utility model multimode three；
Fig. 2 be four mould defects in the passband filter structure of the utility model three formula resonator etching under PCB dielectric-slabs
The structural representation of bottom surface；
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 in the passband filter structure of the utility model three are etched in PCB dielectric-slabs upper surface
Structural representation；
Fig. 6 is the equivalent-circuit model of the passband filter structure of the utility model multimode three；
Fig. 7 (a) is the strange mould equivalent circuit of the passband filter structure of the utility model multimode three, and Fig. 7 (b) is the utility model
The even mould equivalent circuit of the passband filter structure of multimode three；
Fig. 8 is PCB emulation and the Simulation results schematic diagram of the passband filter structure of the utility model multimode three；
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.
The realization of the utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, will be in specific embodiment part one
And it is described further referring to the drawings.
Embodiment
Further to illustrate that the utility model is to reach the technological means and effect that above-mentioned purpose taken, below in conjunction with
Accompanying drawing and preferred embodiment, specific 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 passband filter structure of the utility model multimode three.In this reality
Apply in example, the utility model proposes three passband filter structures include four mould defects ground formula resonator (QMDGSR) 1, radio frequency Horizon
Face 2 and two microstrip feed lines 3.The four moulds defect formula resonator 1 etch on a surface of PCB dielectric-slabs 10 (under such as
Surface, with reference to shown in figure 2), the surface is referred to as radio frequency ground level without the remainder of with etching four mould defects formula resonator 1
2, two microstrip feed lines 3 are separately positioned on another surface (such as upper surface, with reference to shown in figure 5) of PCB dielectric-slabs 10.It is described
PCB dielectric-slabs 10 are a kind of metal medium plate, and the thickness of the PCB dielectric-slabs 10 is 0.79mm, dielectric constant 2.34.
With reference to shown in figure 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 lacks
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 the second of formula resonator 1
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 to be similar to the shape of H-shaped on the whole.Second resonant element 12
Be shaped as L-shaped, quasi- L shapes, U-shaped or the U-shaped that is defined, the quasi- L-shaped defined in the present embodiment is is similar to L-shaped, example on the whole
Such as 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 by one
The length of section is shorter for the length on side where the free end.Quasi- U-shaped defined in this implementation is to be similar to U on the whole
A free end (one end not being connected with the first resonant element 11) for shape can be bent at least once again, after each bending
The length of bending end is shorter for the length on side where the free end, so that being still similar to U-shaped on the whole, no
The performance of the second resonant element 12 can be significantly affected.One end of four the second resonant elements 12 connects the first resonant element 11 respectively
Four ends.Each second resonant element 12 extends to the first central axis ab and to four mould defects the center of formula resonator 1
Bending, the number of the bending is twice.The L-shaped of four the second resonant elements 12, quasi- L-shaped, the equal court of the opening of U-shaped or quasi- U-shaped
To four mould defects the surrounding of formula resonator 1.Positioned at two of the first central axis ab or the second central axis cd homonymies
Interval is separated between two resonant elements 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, the middle part of the other end connection third slot line 113 of first line of rabbet joint 111.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 form.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 also can form L-shaped or quasi- L-shaped structure by the corresponding line of rabbet joint.
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
The first pole plate 31 is formed with the PCB dielectric-slabs that the 6th line of rabbet joint 126 surrounds, first pole plate 31 is shaped as L-shaped.First pole plate 31
Quantity for two (be respectively and the second PCB dielectric-slabs surrounded of the 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, the PCB dielectric-slabs that surround of the 5th line of rabbet joint 125 and the 6th line of rabbet joint 126 form the second pole plate 32, 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 surrounds), 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 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 W3=0.3mm；The length of 5th line of rabbet joint 125 is
L4=2.8mm, width W3=0.3mm；The length of 6th line of rabbet joint is L5=7.3mm, width 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 the passband filter structure of the utility model three in PCB media
The structural representation of plate upper surface.Because two microstrip feed lines 3 are separately positioned on relative to four mould defects 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 formed 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 close to the 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 first line of rabbet joint, 111 same upside, 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 two on the diagonal of formula resonator 1
On 4th line of rabbet joint 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 are whole
Terminate at the 5th line of rabbet joint 125, do not touch the 5th line of rabbet joint 125.Preferably, the impedance of each microstrip feed line 3 is
50 Ω, remote second central axis close to the second central axis cd edge to the 4th line of rabbet joint 124 of each microstrip feed line 3
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 (value i.e. 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 be then d0=(L0-d2)/2。
Close (the spacing d between two microstrip feed lines 3 leaned on due to the end distance of two microstrip feed lines 32For 0-
5mm), thus form source carry coupling feed structure.Because the source carries the formation of coupling, the feed structure can form four
Transmission zero, so as to form the passband filter structure of multimode three.As long as it should be noted that the end of two microstrip feed lines 3 away from
From less than 5mm, three pass-band performances can be formed.Specific embodiment of the utility model d2Preferably 1.6mm, it can obtain preferably
Three pass-band performances.
As shown in fig. 6, Fig. 6 is the equivalent-circuit model of the passband filter structure of the utility model multimode three.By above-mentioned
Structure design, the utility model use odd even film theory to extract equivalent-circuit model come for four mould defects formula resonator 1, and three
The specific equivalent-circuit model of passband filter structure is described as follows：
PCB dielectric-slabs between part first line of rabbet joint 111 and the 6th line of rabbet joint 126 form the first inductance LS, 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 connects with the PCB dielectric-slabs for forming the second pole plate 32.
PCB dielectric-slabs between two article of the 5th line of rabbet joint 125 of the homonymy of first line of rabbet joint 111 form the second inductance LP.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 form the shape of T-shaped.
The four moulds defect the PCB dielectric-slabs of the periphery of formula resonator 1 form 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
The first electric capacity C is formed with the second pole plate 32M, 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 between two space from ends of microstrip feed line 3 form source and carry coupled capacitor CS, each micro-strip feedback
The mould defect of line 3 and four PCB dielectric-slabs between formula resonator (QMDGSR) 1 form feed coupled capacitor CP.Due to there is two
Microstrip feed line 3, therefore form two feed coupled capacitor CP.PCB dielectric-slabs positioned at each microstrip feed line 3 are with being located at first
Two the first inductance L of formation respectively of the downside of the line of rabbet joint 111STwo PCB dielectric-slabs connection.
As shown in fig. 7, the parity mode for three passband filter structures of the utility model based on three passband filter structures 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 short circuits, then
First electric capacity CMThe distance between two-stage plate equivalent to shortening half.Because the distance between the size of electric capacity and pole plate have
Close, therefore the first electric capacity C when the second central axis cd is equivalent to short circuitMSize be the first original electric capacity CMSize
Twice, i.e., now the first electric capacity CMSize be 2CM.When the second central axis cd in even mould equivalent to open circuit when, then first electricity
Hold CMIn there is no electric charge, the first electric capacity CM=0.
With reference to shown in figure 8, Fig. 8 is the utility model based on four mould defects three passband filter structures of formula resonator 1
PCB is emulated and Simulation results schematic diagram.Wherein, circuit simulation original device value 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 port P1And P2Between transmission coefficient.As can be seen from Figure 8, PCB emulation has very high overlap with circuit simulation
Degree, therefore the equivalent-circuit model of the passband filter structure of the utility model multimode three has higher accuracy.Because feed is tied
Structure carries coupled modes using source, and the passband filter structure of multimode three 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, it can be 0-5mm to use the spacing d2 between two microstrip feed lines 3, in 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.
It is cheap that the passband filter structure of multimode three described in the utility model not only processes simple cost, and can produce three
Basic transmission passband, forms three passband filter structures, has higher passband selectivity, therefore is widely used in broadband and more
In the communication of frequency range frequency microwave.Due to four mould defects formula resonator is to slot to obtain on feeding plane, therefore need not be increased
Add extra resonance body, the size of the passband filter structure of multimode three described in the utility model is smaller.
Preferred embodiment of the present utility model is these are only, not thereby limits the scope of the claims of the present utility model, 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 areas, similarly it is included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of passband filter structure of multimode three, including PCB dielectric-slabs, four mould defects ground formula resonator and two micro-strips feedbacks
Line, the four moulds defect formula resonator etching on a surface of PCB dielectric-slabs, two microstrip feed lines be separately positioned on PCB Jie
Another surface of scutum, it is characterised in that the four moulds defect formula resonator shape on the four moulds defect formula resonance
First central axis of device is symmetrical, and the second central axis of on the four moulds defect formula resonator is symmetrical, the first center
Axis is mutually perpendicular to the second central axis；
The four moulds defect formula resonator include the first resonant element and four the second resonant elements, the first resonant element is by
One line of rabbet joint, second line of rabbet joint and third slot line are formed, 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 extends and to four mould defects the center bending of formula resonator；Positioned at two the second resonance lists of the first central axis homonymy
Interval is separated between member；
The edge that the front end of two microstrip feed lines extends respectively into PCB dielectric-slabs forms two ports, two microstrip feed line difference
Position correspondence and, the width ratio of microstrip feed line symmetrical on the first central axis with two article of the 4th line of rabbet joint of the first line of rabbet joint homonymy
The width of 4th line of rabbet joint is wide, and the end of two microstrip feed lines is ended close at the 5th line of rabbet joint, between two microstrip feed line ends
Spacing it is close, two microstrip feed lines form the feed structure that sources carry coupling, and the feed structure forms the three of four transmission zeros
Passband filter structure.
2. the passband filter structure of multimode three as claimed in claim 1, it is characterised in that：One end connection the of first line of rabbet joint
The middle part of two line of rabbet joint, first line of rabbet joint the other end connection third slot line middle part, second line of rabbet joint and third slot line it is parallel and with
First 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 to the first center
Axis extends, and 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 the one of the 6th line of rabbet joint
Hold 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.
3. the passband filter structure of multimode three as claimed in claim 1, it is characterised in that：Part first line of rabbet joint, positioned at
Second line of rabbet joint or third slot line, the 4th groove in same second resonant element of the first line of rabbet joint side of one line of rabbet joint side
The PCB dielectric-slabs that line, the 5th line of rabbet joint and the 6th line of rabbet joint surround form the first pole plate, and first pole plate is shaped as L-shaped.
4. the passband filter structure of multimode three as claimed in claim 1, it is characterised in that part first line of rabbet joint, positioned at
Second line of rabbet joint or third slot line of one line of rabbet joint opposite side, in same second resonant element of the first line of rabbet joint opposite side
The PCB dielectric-slabs that four line of rabbet joint, the 5th line of rabbet joint and the 6th line of rabbet joint surround form the second pole plate, and the second pole plate is shaped as L-shaped.
5. the passband filter structure of multimode three as claimed in claim 1, it is characterised in that the length of first line of rabbet joint is L1=
23.5mm, width 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 W3=0.3mm；The length of 5th line of rabbet joint
Spend for L4=2.8mm, width W3=0.3mm；The length of 6th line of rabbet joint is L5=7.3mm, width 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. the passband filter structure of multimode three as claimed in claim 1, it is characterised in that part first line of rabbet joint and the 6th groove
PCB dielectric-slabs between line form the first inductance LS, the first inductance LSQuantity be four, positioned at the difference of the first line of rabbet joint homonymy
Form two the first inductance LSTwo PCB dielectric-slabs connection, positioned at the first inductance of formation L of the first central axis homonymyS's
PCB dielectric-slabs connect with the PCB dielectric-slabs for forming the first pole plate, positioned at the first inductance of formation L of the first central axis homonymyS's
PCB dielectric-slabs connect with the PCB dielectric-slabs for forming the second pole plate；
PCB dielectric-slabs between two article of the 5th line of rabbet joint of the first line of rabbet joint homonymy form the second inductance LP, 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 connect and form the shape of T-shaped.
7. the passband filter structure of multimode three as claimed in claim 6, it is characterised in that the four moulds defect outside formula resonator
The PCB dielectric-slabs enclosed form radio frequency ground level, form the PCB dielectric-slabs of radio frequency ground level and form the second inductance LPPCB be situated between
Scutum is connected, and the first electric capacity C is formed positioned at the first pole plate of the first central axis homonymy and the second pole plateM, the first pole plate or
The second electric capacity C is formed between second pole plate and metal groundC。
8. the passband filter structure of multimode three as claimed in claim 6, it is characterised in that between the end of two microstrip feed lines
PCB dielectric-slabs between form source and carry coupled capacitor CS, each microstrip feed line and four mould defects between formula resonator
PCB dielectric-slabs form feed coupled capacitor CP, feed coupled capacitor CPQuantity be two, positioned at the PCB of each microstrip feed line
Dielectric-slab and two the first inductance L of formation respectively on the downside of first line of rabbet jointSPCB dielectric-slabs connection.
9. the passband filter structure of multimode three as claimed in claim 1, it is characterised in that close the second of each microstrip feed line
The distance at the edge of central axis to the edge away from the second central axis of the 4th line of rabbet joint is d1=1.35mm.
10. the passband filter structure of multimode three as claimed in claim 9, it is characterised in that two microstrip feed line ends it
Between spacing d2For 1.6mm, the width W of each microstrip feed line0It is 2.34mm, the impedance of each microstrip feed line is 50
Ω。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265182.4U CN206673066U (en) | 2017-03-18 | 2017-03-18 | The passband filter structure of multimode three |
| PCT/CN2017/107203 WO2018171181A1 (en) | 2017-03-18 | 2017-10-21 | Multimode triple-passband filter structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720265182.4U CN206673066U (en) | 2017-03-18 | 2017-03-18 | The passband filter structure of multimode three |
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| CN206673066U true CN206673066U (en) | 2017-11-24 |
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|---|---|---|---|
| CN201720265182.4U Expired - Fee Related CN206673066U (en) | 2017-03-18 | 2017-03-18 | The passband filter structure of multimode three |
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| CN (1) | CN206673066U (en) |
| WO (1) | WO2018171181A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953145A (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 structures |
| CN107026302A (en) * | 2017-03-18 | 2017-08-08 | 深圳市景程信息科技有限公司 | The three passband filter structures with four transmission zeros |
| CN108054476A (en) * | 2017-12-04 | 2018-05-18 | 广东技术师范学院 | A kind of four band-pass filter of frequency band of microwave |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN204130669U (en) * | 2014-08-12 | 2015-01-28 | 南京邮电大学 | Based on the coplanar waveguide ultra wide band filter of interdigital coupling |
| CN105990632B (en) * | 2015-01-28 | 2019-03-08 | 青岛海尔电子有限公司 | A kind of three-passband filter |
| CN107086338B (en) * | 2016-02-16 | 2019-05-21 | 青岛海尔电子有限公司 | Four mould defects ground formula filter |
| CN107086347A (en) * | 2016-02-16 | 2017-08-22 | 青岛海尔电子有限公司 | Four mould defects ground formula resonator |
| 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 |
| CN107026302A (en) * | 2017-03-18 | 2017-08-08 | 深圳市景程信息科技有限公司 | The three passband filter structures with four transmission zeros |
-
2017
- 2017-03-18 CN CN201720265182.4U patent/CN206673066U/en not_active Expired - Fee Related
- 2017-10-21 WO PCT/CN2017/107203 patent/WO2018171181A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953145A (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 structures |
| CN107026302A (en) * | 2017-03-18 | 2017-08-08 | 深圳市景程信息科技有限公司 | The three passband filter structures with four transmission zeros |
| CN108054476A (en) * | 2017-12-04 | 2018-05-18 | 广东技术师范学院 | A kind of four band-pass filter of frequency band of microwave |
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| Publication number | Publication date |
|---|---|
| WO2018171181A1 (en) | 2018-09-27 |
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