CN205828626U - A kind of miniaturization three passband differential power splitter - Google Patents
A kind of miniaturization three passband differential power splitter Download PDFInfo
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- CN205828626U CN205828626U CN201620651163.0U CN201620651163U CN205828626U CN 205828626 U CN205828626 U CN 205828626U CN 201620651163 U CN201620651163 U CN 201620651163U CN 205828626 U CN205828626 U CN 205828626U
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Abstract
This utility model belongs to technical field of micro communication, and particularly to a kind of miniaturization three passband differential power splitter, this allotter includes micro-strip medium substrate, metal ground plate, microstrip feed line, defect ground structure and isolation resistance；Micro-strip medium substrate includes upper strata micro-strip medium substrate and lower floor's micro-strip medium substrate；Lower surface at upper strata micro-strip medium substrate is provided with metal ground plate, is provided with microstrip feed line at the upper surface of upper strata micro-strip medium substrate and the lower surface of lower floor's micro-strip medium substrate；Being etched with defect ground structure on metal ground plate, defect ground structure includes multiple complementary openings resonant ring, and the input slot line that complementary openings resonant ring is arranged by lateral symmetry and output slot line are connected with microstrip feed line.This utility model can be widely applied to the multi-frequency communication system in wireless communication system RF front-end circuit, has composition simple, low cost of manufacture, compact size, working band width, the feature such as reliability and durability.
Description
Technical field
This utility model belongs to technical field of micro communication, particularly to a kind of miniaturization three passband differential power distribution
Device, this utility model can be applicable to the multi-frequency communication system in wireless communication system RF front-end circuit.
Background technology
In recent years, along with the fast development of mobile communication technology, a communication system generally required and was operated in multiple communication
Pattern, if each pattern all uses a power divider to cause, communication system volume is big, cost is high, and multifrequency power divides
Orchestration can contain multiple communication pattern simultaneously, takies volume little, and cost is relatively low, has obtained studying widely.On the other hand, due to
Differential power splitter has good inhibiting effect to noise, it is possible to increase the sensitivity of system, meets Modern Communication System high
The communicating requirement of quality.
Therefore, in order to improve the anti-interference of wireless communication system, multiple communication standard, in recent years state can be contained simultaneously
Inside and outside a lot of research institution and scholar are devoted to the research of differential power splitter.According to " Bin Xia；Lin-Sheng Wu；
Junfa Mao；A new balanced-to-balanced power divider/combiner, IEEE Transactions
On Microwave Theory and TechniqueS, 2012, pp. 2791-27989 " one that proposed becomes based on matrix
The Wilkinson differential power splitter changed, this power divider size is relatively big, and working band is narrower.According to " Jin Shi；
Kai Xu；Compact differential power divider with enhanced bandwidth and in-
Phase or out-of-phase output ports, Electronics Letters, 2014, pp. 1209-1211 " institute
A kind of differential power splitter utilizing coupling line to realize proposed, this power divider Insertion Loss is relatively big, and can not realize
Multiband operation.Need the three passband differential power splitter that a kind of miniaturization, working band are wide, reliability and durability at present badly.
Summary of the invention
This utility model relates to a kind of miniaturization three passband differential power splitter, solves differential power in prior art and divides
Orchestration constitutes complexity, size is big, with high costs, working band is narrow and Insertion Loss is compared with big, ruggedness and reliability the highest low problem.
In order to solve the problems referred to above, the technical solution of the utility model is:
A kind of miniaturization three passband differential power splitter, including micro-strip medium substrate, metal ground plate, microstrip feed line,
Defect ground structure and isolation resistance；
Described micro-strip medium substrate includes upper strata micro-strip medium substrate and lower floor's micro-strip medium substrate；It is situated between in upper strata micro-strip
The lower surface of matter substrate is provided with described metal ground plate, at upper surface and lower floor's micro-strip medium base of upper strata micro-strip medium substrate
The lower surface of plate is provided with microstrip feed line；
Described microstrip feed line include being arranged at the side U-shaped Differential Input port of upper strata micro-strip medium substrate upper surface,
The U-shaped difference output port in side and the second U-shaped difference output port in side being arranged at lower floor's micro-strip medium substrate lower surface；
Described side U-shaped Differential Input port, the first side U-shaped difference output port circuit shape are identical, and the U-shaped difference in side is defeated
The U-shaped difference output port of inbound port and the first side is respectively arranged at micro-strip medium substrate upper surface both sides, upper strata and is situated between about micro-strip
Longitudinal center's axial symmetry of matter substrate；Described side U-shaped Differential Input port, the first U-shaped difference output port in side and the second side U
Type difference output port is all about the transverse center axial symmetry of micro-strip medium substrate；
Metal ground plate is etched with described defect ground structure；Defect ground structure includes multiple complementary openings resonance
Ring, multiple complementary openings resonant rings are separate, and multiple complementary openings resonant rings are bag relative to the central point of metal ground plate
Enclosing the most mutually nested setting of shape, the opening direction of multiple complementary openings resonant rings is complementary；Outermost complementary openings is humorous
Ring lateral symmetry of shaking is connected with input slot line and output slot line；Input, output slot line differential input end U-shaped with side respectively
Mouth, the first U-shaped difference output port of the U-shaped difference output port in side and the second side connect；
Overlapping position at the first U-shaped difference output port of the U-shaped difference output port in side and the second side has multiple non-
Metallization via, all puts into isolation resistance in multiple non-metallic vias.
Described side U-shaped Differential Input port, the first U-shaped difference output port in side are by two sections of parallel longitudinal 50 ohm
Microstrip line is connected with one section of middle horizontal microstrip line composition；
The second described U-shaped difference output port in side is by 50 ohm microstrip of two sections 90 degree bendings and one section of middle horizontal stroke
It is connected to microstrip line and constitutes；
In the middle of side U-shaped Differential Input port, the first U-shaped difference output port of the U-shaped difference output port in side and the second side
Laterally microstrip line have identical physical dimension, input slot line and output slot line respectively with Differential Input port, the first side U
The orthogonal connection of horizontal microstrip line of the U-shaped difference output port of type difference output port and the second side.
Described defect ground structure includes three complementary openings resonant rings, the complementary openings resonant ring opening of innermost layer to
On, Open Side Down to be positioned at the complementary openings resonant ring in middle level, outermost complementary openings resonant ring opening upwards.
Described defect ground structure includes three complementary openings resonant rings, the complementary openings resonant ring opening of innermost layer to
Under, it being positioned at the complementary openings resonant ring opening upwards in middle level, Open Side Down for outermost complementary openings resonant ring.
Described complementary openings resonant ring is half-wave resonator.
Described input slot line is stepped impedance type slot line with output slot line.
In three complementary openings resonant rings, the left and right sides cabling of each complementary openings resonant ring according to other two
Coupling size between complementary openings ring needs to be designed as linear type or broken line type.
Differential signal is inputted by side U-shaped Differential Input port, and side U-shaped Differential Input port is orthogonal with input slot line
Energy is coupled on three complementary openings resonant rings by part, and differential signal is defeated with the first U-shaped difference in side through output slot line
Going out the quadrature component of port and energy is coupled to the first U-shaped difference output port in side, differential signal is through output slot line and the
Energy is coupled to the second U-shaped output port in side by the quadrature component of the two U-shaped output ports in side.
The beneficial effects of the utility model:
1. this utility model proposes three passband differential power splitter first, can be widely applied to multi-band communication systems
In, there is composition simple, low cost of manufacture, compact size, working band width, the feature such as reliability and durability.
2. the defective unit that this utility model only needs three mutually nested different complementary open-loop resonators to constitute obtains three
Passband resonance characteristic, the mid frequency of three passbands is only determined by defective unit, and size is little, compact conformation, it is easy to analyze.
3. this utility model uses microstrip line to turn the transmission structure of slot line to carry out the suppression of common-mode signal, balanced type
Microstrip feed line symmetrical configuration, affects less on difference mode signal and suppresses common-mode signal substantially, to be capable of broadband common mode simultaneously
Suppression.
4. this utility model is due to the separately design of differential-mode portion and common mode part, it is possible to when ensureing to adjust differential mode transmission frequency
Common mode inhibition is not affected, simplifies design process and the later stage debugging of difference power splitter.
5. the cabling of this utility model each complementary openings resonant ring left and right sides can be designed as linear type or broken line type,
Different cabling forms can realize coupling sizes different between resonant ring, by controlling complementary openings resonant ring and slot line
Coupling and resonant ring between coupling, it is achieved the quasi-independent tuning of three pass band widths, simultaneously facilitate regulation opening resonance
Ring length.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model；
Fig. 2 is that the element on the micro-strip medium substrate of this utility model upper strata constitutes schematic diagram；
Fig. 3 is that the element on this utility model lower floor micro-strip medium substrate constitutes schematic diagram；
Fig. 4 is differential-mode response S parameter curve and amplitude difference curve chart in this utility model embodiment；
Fig. 5 is differential-mode response isolation curve and phase contrast curve chart in this utility model embodiment；
Fig. 6 is common-mode response S parameter curve chart in this utility model embodiment.
In figure, 1-band medium substrate, 11-upper strata micro-strip medium substrate, 12-lower floor micro-strip medium substrate；
2-metal ground plate；
3-microstrip feed line, 31-side U-shaped Differential Input port, the U-shaped difference output port in 32-the first side, 33-the second side is U-shaped
Difference output port；
4-defect ground structure, 41-inputs slot line, 42-complementary openings resonant ring, and 43-exports slot line；
5-isolation resistance.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is further detailed,
With reference to Fig. 1, this utility model relates to a kind of miniaturization three passband differential power splitter, including micro-strip medium substrate
1, metal ground plate 2, microstrip feed line 3, defect ground structure 4, isolation resistance 5, wherein:
Micro-strip medium substrate 1 includes upper strata micro-strip medium substrate 11 and lower floor's micro-strip medium substrate 12, upper strata micro-strip medium
Substrate 11 and lower floor's micro-strip medium substrate 12 all use dielectric constant to be 2.2, thickness be 0.787mm cover copper medium substrate, its
A size of 36mm × 24mm.
With reference to Fig. 2, the lower surface of upper strata micro-strip medium substrate 11 has metal ground plate 2, upper strata micro-strip medium substrate 11
Upper surface is provided with side U-shaped Differential Input port 31 and the U-shaped difference output port in the first side 32, lower floor relative to longitudinal axis symmetry
Micro-strip medium substrate lower surface is provided with the second U-shaped difference output port in side 33；U-shaped Differential Input port the 31, first side, side is U-shaped
The U-shaped difference output port of difference output port 32 and the second side 33 collectively constitutes microstrip feed line 3.Side U-shaped Differential Input port
31, horizontal about micro-strip medium substrate 1 of the first U-shaped difference output port in side 32 and the second side U-shaped difference output port 33
Substantially symmetrical about its central axis；
Metal ground plate 2 is etched with defect ground structure 4；U-shaped at the first U-shaped difference output port in side 32 and the second side
The part that difference output port 33 overlaps has three non-metallic vias, is respectively put into isolation in three non-metallic vias
Resistance 5, the placement of isolation resistance 5 increases the isolation between difference output port 32 and difference output port 33.
Side U-shaped Differential Input port 31 and the U-shaped difference output port in the first side 32 are by two sections of parallel longitudinal 50 ohm
Microstrip line is connected with one section of middle horizontal microstrip line composition；Wherein two sections of vertical 50 parallel ohm microstrip are as U-shaped two
Limit is used for differential signal transmission；One section of middle horizontal microstrip line, as U-shaped base, is used for the defect ground structure 4 of bottom
Feed.With reference to Fig. 3, the second U-shaped difference output port in side 33 is by 50 ohm microstrip of two sections 90 degree bendings and one section of centre
Laterally microstrip line is connected is constituted；One section of microstrip line in the middle of wherein, as U-shaped base, is used for coupling in defect ground structure 4
Differential signal, 50 ohm microstrip of two sections 90 degree bendings are used for exporting differential signal as U-shaped both sides, two sections 90 degree simultaneously
The microstrip line of bending changes the trend of the second U-shaped difference output port in side 33, it is simple to welding sub-miniature A connector, will not be with the first side U
The sub-miniature A connector of type difference output port 32 is mutually conflicted；One section of horizontal microstrip line in the middle of second side U-shaped difference output port 33
Being in the underface of one section of middle horizontal microstrip line of the first side U-shaped difference output port 32, two sections of horizontal microstrip lines have phase
Same physical dimension.
Defect ground structure 4 includes three complementary openings resonant rings 42, the most outermost complementary openings resonant ring 42 opening
Upwards, the most outermost complementary openings resonant ring lateral symmetry is connected with input slot line 41 and output slot line 43；In being positioned at
Open Side Down for the complementary openings resonant ring of layer, the complementary openings resonant ring opening upwards of innermost layer.Three complementary openings resonant rings
42 opening directions are complementary and separate the most mutually nested in circumferentially surrounding shape relative to the central point of metal ground plate 2
Arrange；The horizontal microstrip line on the U-shaped base of input slot line 41 Differential Input U-shaped with side port 31 is orthogonal；Output slot line 43
Orthogonal with the horizontal microstrip line on the U-shaped base of difference output port 32, output slot line 43 and the U-shaped difference output in the second side simultaneously
The horizontal microstrip line on the U-shaped base of port 33 is orthogonal, sees Fig. 2.
Differential signal is inputted by side U-shaped Differential Input port 31, side U-shaped Differential Input port 31 and input slot line 41
Quadrature component energy is coupled on three complementary openings resonant rings 42, differential signal is through output slot line 43 and the first side
Energy is coupled to the first U-shaped difference output port in side 32 by U-shaped difference output port 32 quadrature component, and differential signal passes through simultaneously
Energy is coupled to the second U-shaped difference output end in side by output slot line 43 and the second side U-shaped difference output port 33 quadrature component
Mouth 33；Three complementary openings resonant rings 42 are capable of controlling three passband central frequencies and the accurate independent of bandwidth, defect ground knot
Structure ensure that differential mode signal transmission, simultaneously works as the inhibitory action to common-mode signal interference.
Complementary openings resonant ring 42 of the present utility model is half-wave resonator, by changing each complementary openings resonance
The length of ring, it is achieved the mid frequency independent regulation of three passbands.Changing the spacing between each complementary openings resonant ring 42 can
To realize the quasi-independent regulation of three pass band widths.
Effect of the present utility model can be further illustrated by emulation and test:
To a kind of miniaturization three passband differential power splitter of the present utility model in 3 D electromagnetic simulation software HFSS
Emulate, utilize vector network analyzer that a kind of miniaturization three passband differential power splitter of the present utility model is carried out reality
The test of thing, obtains the differential-mode response S parameter curve of this differential power splitter and differential-mode response isolation curve respectively such as Fig. 4
Shown in Fig. 5, common-mode response S parameter curve is as shown in Figure 6.
From differential-mode response S parameter curve and the amplitude difference curve of Fig. 4 it can be seen that this utility model three passband differential power
The mid frequency of three passbands of allotter is respectively 1.58GHz, 2.5GHz and 3.5GHz, and insertion loss is respectively 3.47dB,
3.3dB and 3.9dB, 3dB relative bandwidth is respectively 19.4%, 12.2% and 14.7%, and the return loss in three passbands all can reach
To more than 13dB, the amplitude difference between output port 32 and output port 33 is less than 0.5dB.From the differential-mode response isolation of Fig. 5
Curve and phase contrast curve are it can be seen that the output port 32 of this utility model three passband differential power splitter and output port
Isolation between 33 reaches more than 12dB, and phase contrast is less than 2o.From the common-mode response S parameter curve of Fig. 6 it can be seen that this reality
Having good broadband common-mode rejection properties with novel three-way band differential power splitter, the common mode inhibition in whole frequency range can
To reach more than 40dB, significantly larger than required in communication system 20dB common mode inhibition requirement.All be can be seen that by Fig. 4-Fig. 6
Simulation result and the test result goodness of fit are good.
In sum, disclosed in this utility model, a kind of miniaturization three passband differential power splitter, mainly realizes difference
The multi-frequency working problem of power divider, including micro-strip medium substrate 1, metal ground plate 2, microstrip feed line 3, defect ground structure
4, isolation resistance 5.Wherein, it is defeated that what upper strata micro-strip medium substrate 11 upper surface was symmetrical is provided with two U-shaped difference in the identical side of structure
The U-shaped difference output port of inbound port 31 and the first side 32, it is defeated that lower floor's micro-strip medium substrate 12 lower surface is provided with the second U-shaped difference in side
Going out port 33, the second U-shaped difference output port in side 33 is in the underface of difference output port 32；Upper strata micro-strip medium substrate 11
Lower surface be metal ground plate 2, metal ground plate 2 etching defect ground structure 4 above, defect ground structure 4 distributes about power
Longitudinal neutral axis of device is symmetrical, including three complementary openings resonant rings 42 and input slot line 41 and output slot line 43；
Three complementary openings resonant rings 42 are the most mutually nested in surrounding shape relative to the central point of metal ground plate, input and output
Slot line is stepped impedance type, to reduce defect ground structure；At difference output port 32 and difference output port 33 coincidence part
Office has three non-metallic vias, is respectively put into three isolation resistances to increase outfan in three non-metallic vias
Isolation between mouth 32 and output port 33.
This utility model can the accurate independent mid frequency controlling three differential mode passbands and bandwidth, by controlling each complementation
The length of split ring resonator 42, it is achieved the mid frequency of three passbands independently controls；Humorous by changing adjacent two complementary openings
Shake the spacing between ring 42, it is achieved the quasi-independent regulation of three pass band widths；By changing the input width of slot line 41 and defeated
Go out the width of slot line 43, change length and the length of output slot line 43 of input slot line 41, it is achieved three passbands simultaneously
The regulation of bandwidth.This utility model is capable of the miniaturization of differential power splitter simultaneously, has good broadband common mode
Rejection characteristic, can be applicable to the multi-frequency communication system in wireless communication system RF front-end circuit.
Content of the present utility model is not limited to cited by embodiment, and those of ordinary skill in the art are new by reading this practicality
Type description and the conversion of any equivalence of taking technical solutions of the utility model, be claim of the present utility model institute
Contain.
Claims (8)
1. a miniaturization three passband differential power splitter, it is characterised in that: include micro-strip medium substrate (1), metallic ground
Plate (2), microstrip feed line (3), defect ground structure (4) and isolation resistance (5)；
Described micro-strip medium substrate (1) includes upper strata micro-strip medium substrate (11) and lower floor's micro-strip medium substrate (12)；Upper
The lower surface of layer micro-strip medium substrate (11) is provided with described metal ground plate (2), upper on upper strata micro-strip medium substrate (11)
The lower surface of surface and lower floor's micro-strip medium substrate (12) is provided with microstrip feed line (3)；
Described microstrip feed line (3) includes the side U-shaped Differential Input port being arranged at upper strata micro-strip medium substrate (11) upper surface
(31), the first U-shaped difference output port in side (32) and be arranged at the second U-shaped difference in side of lower floor's micro-strip medium substrate (12) lower surface
Divide output port (33)；
Described side U-shaped Differential Input port (31), the first side U-shaped difference output port (32) circuit shape are identical, the U-shaped difference in side
Input port (31) and the first side U-shaped difference output port (32) is divided to be respectively arranged at upper strata micro-strip medium substrate (11) upper surface
Both sides the longitudinal center's axial symmetry about micro-strip medium substrate (1)；Described side U-shaped Differential Input port (31), the first side U
Type difference output port (32) and the second side U-shaped difference output port (33) are all about the transverse center of micro-strip medium substrate (1)
Axial symmetry；
Metal ground plate (2) is etched with described defect ground structure (4)；Defect ground structure (4) includes multiple complementary openings
Resonant ring (42), multiple complementary openings resonant rings (42) are separate, and multiple complementary openings resonant rings (42) connect relative to metal
The central point on floor (2) is in surrounding the most mutually nested setting of shape, the opening direction of multiple complementary openings resonant rings (42)
Complementary；Outermost complementary openings resonant ring (42) lateral symmetry is connected with input slot line (41) and output slot line (43)；Defeated
Enter, to export slot line Differential Input port (31) U-shaped with side respectively, the first U-shaped difference output port in side (32) and the second side U-shaped
Difference output port (33) connects；
Overlapping position in the first U-shaped difference output port in side (32) and the second side U-shaped difference output port (33) has many
Individual non-metallic via, all puts into isolation resistance (5) in multiple non-metallic vias.
Miniaturization three passband differential power splitter the most according to claim 1, it is characterised in that: the U-shaped difference in described side
Divide input port (31), the first U-shaped difference output port in side (32) by two sections of 50 parallel longitudinal ohm microstrip and centre
One section of horizontal microstrip line be connected constitute；
The the second described U-shaped difference output port in side (33) is by 50 ohm microstrip of two sections 90 degree bendings and one section of middle horizontal stroke
It is connected to microstrip line and constitutes；
Side U-shaped Differential Input port (31), the first U-shaped difference output port in the U-shaped difference output port in side (32) and the second side
(33) the horizontal microstrip line in the middle of has an identical physical dimension, input slot line (41) and export slot line (43) respectively with difference
Divide input port (31), the horizontal micro-strip of the first U-shaped difference output port in side (32) and the second side U-shaped difference output port (33)
The orthogonal connection of line.
Miniaturization three passband differential power splitter the most according to claim 1 and 2, it is characterised in that: described defect
Ground structure (4) includes three complementary openings resonant rings (42), and complementary openings resonant ring (42) opening upwards of innermost layer, in being positioned at
Open Side Down for the complementary openings resonant ring (42) of layer, outermost complementary openings resonant ring (42) opening upwards.
Miniaturization three passband differential power splitter the most according to claim 3, it is characterised in that: described defect ground knot
Structure (4) includes three complementary openings resonant rings (42), and Open Side Down for the complementary openings resonant ring (42) of innermost layer, is positioned at middle level
Complementary openings resonant ring (42) opening upwards, Open Side Down for outermost complementary openings resonant ring (42).
Miniaturization three passband differential power splitter the most according to claim 4, it is characterised in that: described complementary openings
Resonant ring (42) is half-wave resonator.
Miniaturization three passband differential power splitter the most according to claim 5, it is characterised in that: described input gap
Line (41) is stepped impedance type slot line with output slot line (43).
Miniaturization three passband differential power splitter the most according to claim 6, it is characterised in that: three complementary openings
In resonant ring (42), the left and right sides cabling of each complementary openings resonant ring (42) according to other two complementary openings resonant rings
(42) the coupling size between needs to be designed as linear type or broken line type.
Miniaturization three passband differential power splitter the most according to claim 1, it is characterised in that: differential signal passes through side
U-shaped Differential Input port (31) inputs, and the quadrature component of side U-shaped Differential Input port (31) and input slot line (41) is by energy
Being coupled on three complementary openings resonant rings (42), differential signal is through output slot line (43) and the first U-shaped difference output in side
Energy is coupled to the first U-shaped difference output port in side (32) by the quadrature component of port (32), and differential signal is through output gap
Energy is coupled to the second U-shaped output port in side (33) with the quadrature component of the second U-shaped output port in side (33) by line (43).
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| CN201620651163.0U CN205828626U (en) | 2016-06-28 | 2016-06-28 | A kind of miniaturization three passband differential power splitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977600A (en) * | 2016-06-28 | 2016-09-28 | 西安工业大学 | Small-size three-passband differential power divider |
| CN109509974A (en) * | 2018-12-22 | 2019-03-22 | 昆山恩电开通信设备有限公司 | A kind of ultralow section high-performance dual-polarization radiation unit |
| CN109842989A (en) * | 2017-11-24 | 2019-06-04 | 广达电脑股份有限公司 | High speed circuit and its high-speed-differential cable architecture |
-
2016
- 2016-06-28 CN CN201620651163.0U patent/CN205828626U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977600A (en) * | 2016-06-28 | 2016-09-28 | 西安工业大学 | Small-size three-passband differential power divider |
| CN109842989A (en) * | 2017-11-24 | 2019-06-04 | 广达电脑股份有限公司 | High speed circuit and its high-speed-differential cable architecture |
| CN109509974A (en) * | 2018-12-22 | 2019-03-22 | 昆山恩电开通信设备有限公司 | A kind of ultralow section high-performance dual-polarization radiation unit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161221 Termination date: 20180628 |