CN107492702A - A kind of coaxial power splitters of low PIM - Google Patents
A kind of coaxial power splitters of low PIM Download PDFInfo
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- CN107492702A CN107492702A CN201710567177.3A CN201710567177A CN107492702A CN 107492702 A CN107492702 A CN 107492702A CN 201710567177 A CN201710567177 A CN 201710567177A CN 107492702 A CN107492702 A CN 107492702A
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- Prior art keywords
- coaxial
- power splitter
- pim
- low
- conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/183—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers at least one of the guides being a coaxial line
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- Coupling Device And Connection With Printed Circuit (AREA)
Abstract
A kind of coaxial power splitters of low PIM, belong to microwave passive part.For this technical requirement of low PIM, propose the design of novelty, inner and outer conductor integrated design and TNC connectors use chokes feeding classification with power splitter, eliminate because contact it is not thorough and caused by it is non-linear, reduce the PIM sources of power splitter, it is achieved thereby that the low PIM performances of passive component in itself.The present invention is made up of integrated internal and external conductor, dielectric support, absorbing load, cover plate and TNC connectors.Overcome the deficiencies in the prior art of the present invention, it is proposed that a kind of new design, solve the low PIM of the type passive component technical problem.
Description
Technical field
The present invention relates to a kind of low coaxial power splitters of PIM, belong to antenna technical field.
Background technology
Passive intermodulation refers to two or more transmitting carrier waves when passing through passive component, non-thread due to passive component
Property characteristic, cause launch carrier wave produce linear combination, generate new frequency component.When new caused frequency component falls on reception
In passage and when power level is larger, receiver will be interfered, influence receiver and receive useful signal.
From mechanism caused by PIM, product PIM control source and key be to design, passive intermodulation product be by
In high-frequency interferencing signal caused by non-linear current fall into reception band in, non-linear current produce source include contact nonlinear and
Material nonlinearity.
The power splitter of conventional coaxial branch directional coupler form, in the engineer applied of reality, used in structure type
Scheme be inner and outer conductor separation design, that is, separately design, process inner and outer conductor, assembling stage by each component combination and
Into.Ensure inner and outer conductor axiality by multiple (general four) dielectric supports.TNC connectors are connected with power splitter using screw
Connect, inner and outer conductor also uses mode connects for screw at isolated port.For the low PIM of passive component this technical requirements, this reality
Existing mode have one it is inevitable the defects of, that is, contact is not thorough and caused non-linear, mainly at isolated port in,
It is passive so as to inevitably increase in this 2 points of outer conductor connected mode and the connected mode of TNC connectors and power splitter
The PIM sources of part.
The content of the invention
The technology of the present invention solves problem：Overcome the deficiencies in the prior art, it is proposed that a kind of low coaxial power splitters of PIM,
Solve the low PIM of coaxial passive component technical requirements.
The technical solution adopted by the present invention is：
A kind of coaxial power splitters of low PIM, including the support of internal and external conductor, TNC connectors, cavity medium, connector medium branch
Support, cover plate and isolated port load；
Internal and external conductor is four port parts that two parallel coaxial transmission lines are connected as one by the coupling mechanism of centre, its
In a coaxial line two-port be power splitter input port and straight-through delivery outlet, another coaxial line two-port for coupling delivery outlet and
Isolated port, power splitter input port, straight-through delivery outlet, coupling delivery outlet connect three TNC connectors as coaxial power splitter respectively
External interface, the symmetrical centre of coaxial power splitter is provided with cavity medium support, for ensureing the axiality of coaxial power splitter；
The inner wire of TNC connectors is inserted in the choke groove of coaxial inner conductor of power splitter, and the end of the inner wire in TNC connectors is set
Connector dielectric support is equipped with, for ensureing the axiality of TNC connectors inner wire and coaxial inner conductor of power splitter choke groove, together
Axle power splitter isolated port is provided with isolated port load；The both sides of internal and external conductor pass through cover closure.
The internal and external conductor is integrated.
The internal and external conductor of integral structure in the principal arm of power splitter two by respectively adding 2 length to be about λg/ 4 terminal short circuit
The realization of coaxial drop line, wherein, λgFor incident wavelength.
The inner wire of TNC connectors and coaxial inner conductor of power splitter are non-contact.
The connector dielectric support is the hollow cylinder structure of one end open, is enclosed on the end of the inner wire of TNC connectors
Portion.
The inner wire section of internal and external conductor is square, and parameter is 6mm × 6mm, and the outer conductor inner section of internal and external conductor is
Square, parameter are 15mm × 15mm, lead directly to delivery outlet and couple the centre-to-centre spacing 52mm between delivery outlet.
Isolated port support structures form is wedgelike, overall length 22mm, wedge partial-length 11mm, lower section ginseng on wedge
Number is respectively：5mm×8mm、15mm×15mm.
The centre of internal and external conductor, that is, be provided with cavity medium support opening position cavity parameters 70mm × 52mm ×
15mm。
The inner wire parameter of the TNC connectors：Φ 2.1mm, L=42.7mm.
Cavity medium support material be polytetrafluoroethylene (PTFE), thickness 5mm, the center that cavity medium supports have two 6mm ×
10mm square hole, two square hole spacing 16mm；Cavity medium support is provided at both ends with U-shaped hole, width 6mm, depth 15.5mm；
Connector dielectric support material is polytetrafluoroethylene (PTFE), its chamber extracorporeal parameter：Φ 3.2mm, H=2.5mm, cavity internal reference
Number：Φ 2.1mm, H=2mm.
The present invention has the beneficial effect that compared with prior art：
(1) present invention uses a kind of low coaxial power splitter designs of PIM, efficiently avoid contact nonlinear problem；
(2) present invention has principle by coaxial directional coupler internal and external conductor integrated design, distributing point choke designs
Simply, the advantages that convenient and easy；
(3) present invention has low PIM characteristics, has good antijamming capability；
(4) principle of the invention is simple, and design is easy, have the advantages that function admirable, using facilitate, it is practical, answer
Basic fundamental is more ripe, is easy to the features such as engineering application, has very strong competitiveness.
Brief description of the drawings
Fig. 1 is the low coaxial power divider structure diagrammatic cross-sections of PIM of the present invention；
Fig. 2 is sectional view at power splitter branch of the present invention short circuit；
Fig. 3 is illustraton of model at power splitter isolated port of the present invention；
Fig. 4 is TNC connectors of the present invention and inner wire assembling schematic diagram；
Fig. 5 is power splitter VSWR result of calculations of the present invention；
Fig. 6 is power splitter exploded view of the present invention；
Fig. 7 is cavity of power distributor illustraton of model of the present invention；
Fig. 8 is the parameter of power splitter dielectric support 3 of the present invention；
Fig. 9 is power splitter electrical property physical parameter of the present invention；
Figure 10 is the parameter of power splitter dielectric support 4 of the present invention；
Figure 11 is that power splitter of the present invention loads physical parameter；
Figure 12 is power splitter PIM performance test results of the present invention.
Embodiment
The invention provides a kind of low coaxial power splitters of PIM, as shown in figure 1, being connect including integrated inner and outer conductor 1, TNC
Plug-in unit 2, cavity PTFE medium support 3, connector PTFE medium support 4, cover plate 5, isolated port load 6.
Internal and external conductor 1 is four port parts that two parallel coaxial transmission lines are connected as one by the coupling mechanism of centre,
A wherein coaxial line two-port is power splitter input port and straight-through delivery outlet, and another coaxial line two-port is coupling delivery outlet
And isolated port, power splitter input port, straight-through delivery outlet, coupling delivery outlet connect three TNC connectors 2 as with shaft work point respectively
The external interface of device, the symmetrical centre of coaxial power splitter is provided with cavity medium support 3, for ensureing the coaxial of coaxial power splitter
Degree；The inner wires of TNC connectors 2 inserted in the choke groove of coaxial inner conductor of power splitter, and in the inner wire of TNC connectors 2
End set has connector dielectric support 4, for ensureing the inner wire of TNC connectors 2 and coaxial inner conductor of power splitter choke groove
Axiality, coaxial power splitter isolated port are provided with isolated port load 6；Closed by cover plate 5 both sides of internal and external conductor 1.
The low coaxial integrated inner and outer conductors of power splitter main part of PIM, for ease of realizing the structure, it is according to length
λg/4(λgFor incident wavelength) terminal short circuit the equivalent open circuit of coaxial transmission line principle, respectively add in the principal arm of power splitter two 2 long
Degree is about λgThe coaxial drop line of/4 terminal short circuit connects as one coaxial power splitter inner and outer conductor, as shown in Figure 2.Together
When coaxial power splitter isolated port inner and outer conductor is also connected as a single entity, as shown in Figure 3.It is this design reduce in structure in,
The mode connects for screw of outer conductor, so as to reduce or eliminate the non-linear of contact.
Power splitter external interface is TNC, and TNC connectors 2 are the radio frequency connector of standard.The low coaxial power splitter one of PIM
Change feeding classification of the internal and external conductor 1 with the feed of TNC connectors 2 using chokes, feed is to eliminate tradition in this way
The contact nonlinear that connected mode is brought.Its assembling schematic diagram as shown in figure 4, inner conductor of power splitter on external TNC interfaces edge
Inner conductor of power splitter axially opens an a diameter of 3.2mm, deep 34mm hole.In a diameter of 2.1mm TNC inner wire patchholes.
To ensure that TNC inner wires and square coaxial line inner wire are coaxial after assembling, in square coaxial line inner wire perforate bottom addition polymerization tetrafluoro second
Alkene dielectric support 4, PTFE medium support 4 electrical design parameters to refer to Figure 10.
The principal arm center of power splitter two adds the dielectric support 3 that material is polytetrafluoroethylene (PTFE), both ensure that the low coaxial power splitters of PIM
The axiality of coaxial line, compared with traditional coaxial power splitter, this configuration reduces the dielectric support in coaxial power splitter
Quantity, the structural parameters of dielectric support 3 refer to Fig. 8.
6 structure types of the built-in load of isolated port are wedgelike, overall length 22mm, wedge partial-length 11mm, and wedge is upper and lower
Cross section parameter is respectively：5mm×8mm、15mm×15mm.The use of the built-in load of isolated port realizes low PIM with shaft work point
Device port match.To load 6 built in fixation, R=1mm spud pile, built-in load 6 detailed designs ginseng are devised in the conductor
Number is shown in Figure 11, VSWR design results such as Fig. 5, as seen from the figure VSWR≤1.10, and built-in load 6 is used so that the same shaft works of low PIM
Divide device port match good.
Difficulty is realized in order to reduce the low coaxial power splitters of PIM, by the upper and lower bottom surface of the coaxial power splitters of low PIM in structure design
Two pieces of independent cover plates are decomposed into, upper and lower cover plate screw connects with coaxial power splitter main part (integrated inner and outer conductor).
Exploded view is as shown in fig. 6, this design greatly reduces difficulty of processing.
The performance to be realized of the present invention is：Low PIM.
The present invention solves by optimization design power divider structure, considers that factor, the low PIM power splitters such as manufacturing process are fine
Ground meets technical requirement.The program has good performance, can meet technical requirement well.
The low coaxial power splitters of PIM of the present invention, are realized by following steps：
The first step：According to working frequency, power splitter inner and outer conductor parameter is determined；
Second step：According to working frequency, λ is obtainedgThe coaxial drop line parameter of/4 terminal short circuits；
3rd step：According to step 1 and connector (such as：TNC) require, design inner conductor of power splitter axial direction choke groove
Diameter and depth；
4th step：Chokes distributing point bottom dielectric supporting construction is designed according to step 3.
Embodiment：
The coaxial power splitters of low PIM as shown in Figure 1.The inner wire cross section parameter of the low coaxial power splitters of PIM be 6mm × 6mm,
Cavity inner section parameter 15mm × 15mm, it is 50 Ω that the parameter, which establishes power splitter port Impedance, while analyzes power capacity,
Analysis result：Power capacity meets to require.2 length are respectively added to be about λ in the principal arm of power splitter twogCoaxial point of/4 terminal short circuit
Branch line, length 41.5mm are calculated according to waveguide wavelength；The coaxial drop line spacing 167.6mm of terminal short circuit is to consider work(point
Device VSWR indexs are established；Inner wire length 188.8mm, outer conductor inwall length 190mm, respectively have between the inner and outer conductor of both sides
0.6mm spacing, the parameter mainly consider the problem of power splitter matches with TNC connectors VSWR.
Inner conductor of power splitter coupling aperture detail parameters：Diameter 3.2mm, deep 34mm.The determination of diameter mainly considers that TNC is patched
Part 2 is standard component, TNC inner wire diameter of phi 2.1mm, is matched by debugging, and obtains inner wire coupling aperture diameter of phi 3.2mm, deep
34mm, see Fig. 9.
In it should actually use, therefore power splitter, will be set through environmental tests such as overheat, mechanics in power splitter symmetrical centre
Count the dielectric support 3 that material is polytetrafluoroethylene (PTFE)), and it is 5mm × 3mm's to devise parameter on inner conductor of power splitter
Groove, dielectric support is secured, dielectric support detailed design parameter is shown in Fig. 8, and inner wire detailed design parameter is shown in Fig. 9；In inner wire
Also the dielectric support 4 that material is polytetrafluoroethylene (PTFE) is devised in coupling aperture, ensure that after assembling in TNC inner wires and square coaxial line
Conductor coaxial, consider dielectric support assembly problem at this, a diameter of 0.8mm has been beaten at interior conductor distance symmetrical centre 50.2mm
Air-vent, its three-dimensional model diagram such as Fig. 7, the detailed design parameter of dielectric support 4 is shown in Figure 10.
Power splitter isolated port connects built-in load 6, to realize the matching of power splitter electrical property, to load 6 built in fixation,
R=1mm spud pile is devised on inner wire, 6 detailed design parameters of built-in load are shown in Figure 11, VSWR design results such as Fig. 5.
As shown in figure 12, after method of the present invention is employed, the coaxial power splitter PIM tests of designed low PIM
As a result it is better than -125dBm.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (10)
- A kind of 1. coaxial power splitters of low PIM, it is characterised in that：Including internal and external conductor (1), TNC connectors (2), cavity medium branch Support (3), connector dielectric support (4), cover plate (5) and isolated port load (6)；Internal and external conductor (1) is four port parts that two parallel coaxial transmission lines are connected as one by the coupling mechanism of centre, its In a coaxial line two-port be power splitter input port and straight-through delivery outlet, another coaxial line two-port for coupling delivery outlet and Isolated port, power splitter input port, straight-through delivery outlet, coupling delivery outlet connect three TNC connectors (2) as with shaft work point respectively The external interface of device, the symmetrical centre of coaxial power splitter is provided with cavity medium support (3), for ensureing the same of coaxial power splitter Axle degree；The inner wire of TNC connectors (2) is inserted in the choke groove of coaxial inner conductor of power splitter, and in the interior of TNC connectors (2) The end set of conductor has connector dielectric support (4), for ensureing to lead in TNC connectors (2) inner wire and coaxial power splitter The axiality of body choke groove, coaxial power splitter isolated port are provided with isolated port load (6)；The both sides of internal and external conductor (1) lead to Cross cover plate (5) closing.
- A kind of 2. low coaxial power splitters of PIM according to claim 1, it is characterised in that：The internal and external conductor (1) is integrated Change structure.
- A kind of 3. low coaxial power splitters of PIM according to claim 2, it is characterised in that：The internal and external conductor of integral structure (1) by respectively adding 2 length to be about λ in the principal arm of power splitter twogThe coaxial drop line realization of/4 terminal short circuit, wherein, λgTo enter Ejected wave is grown.
- A kind of 4. low coaxial power splitters of PIM according to claim 1, it is characterised in that：The inner wire of TNC connectors (2) It is non-contact with coaxial inner conductor of power splitter.
- A kind of 5. low coaxial power splitters of PIM according to claim 1, it is characterised in that：The connector dielectric support (4) For the hollow cylinder structure of one end open, the end of the inner wire of TNC connectors (2) is enclosed on.
- A kind of 6. low coaxial power splitters of PIM according to claim 1, it is characterised in that：The inner wire of internal and external conductor (1) is cut Face is square, and parameter is 6mm × 6mm, and the outer conductor inner section of internal and external conductor (1) is square, and parameter is 15mm × 15mm, Centre-to-centre spacing 52mm between straight-through delivery outlet and coupling delivery outlet.
- A kind of 7. low coaxial power splitters of PIM according to claim 1, it is characterised in that：Isolated port loads (6) structure shape Formula is wedgelike, and overall length 22mm, wedge partial-length 11mm, cross section parameter is respectively wedge up and down：5mm×8mm、15mm× 15mm。
- A kind of 8. low coaxial power splitters of PIM according to claim 1, it is characterised in that：The central part of internal and external conductor (1) Position, that is, it is provided with cavity parameters 70mm × 52mm × 15mm of the opening position of cavity medium support (3).
- A kind of 9. low coaxial power splitters of PIM according to claim 1, it is characterised in that：The TNC connectors (2) it is interior Conductor parameter：Φ 2.1mm, L=42.7mm.
- A kind of 10. low coaxial power splitters of PIM according to claim 1, it is characterised in that：Cavity medium supports (3) material For polytetrafluoroethylene (PTFE), thickness 5mm, there are two 6mm × 10mm square hole, two square hole spacing in the center of cavity medium support (3) 16mm；Cavity medium support (3) is provided at both ends with U-shaped hole, width 6mm, depth 15.5mm；Connector dielectric support (4) material is polytetrafluoroethylene (PTFE), its chamber extracorporeal parameter：Φ 3.2mm, H=2.5mm, cavity internal reference Number：Φ 2.1mm, H=2mm.
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| CN201710567177.3A CN107492702A (en) | 2017-07-12 | 2017-07-12 | A kind of coaxial power splitters of low PIM |
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| CN201710567177.3A CN107492702A (en) | 2017-07-12 | 2017-07-12 | A kind of coaxial power splitters of low PIM |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111029702A (en) * | 2019-12-08 | 2020-04-17 | 南京航空航天大学 | Waveguide three-way power divider with built-in load |
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Application publication date: 20171219 |