CN207691420U - A kind of radio frequency lightning protection device - Google Patents
A kind of radio frequency lightning protection device Download PDFInfo
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- CN207691420U CN207691420U CN201721888485.8U CN201721888485U CN207691420U CN 207691420 U CN207691420 U CN 207691420U CN 201721888485 U CN201721888485 U CN 201721888485U CN 207691420 U CN207691420 U CN 207691420U
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Abstract
The utility model belongs to lightning protection device technical field, provides a kind of radio frequency lightning protection device comprising outer conductor is equipped in the outer conductor：Input impedance conversion unit, the input impedance conversion unit include multiple input impedance transformer；The output impedance converter unit being connect with the input impedance conversion unit, the output impedance converter unit include multiple output impedance converters；Branch line, the first end of the branch line are connect with the connects end altogether of the input impedance conversion device and the output impedance converter unit, and the input impedance conversion unit is with the output impedance converter unit about the connects end altogether symmetry arrangement；Bias unit, the bias unit are connect with the second end of the branch line；Input line, the input line are connect with the input impedance conversion unit；Output line, the output line are connect with the output impedance converter unit, and the output line is identical as the impedance of the output line.The working band of radio frequency lightning protection device has been expanded, it is simple in structure.
Description
Technical field
The utility model belongs to lightning protection device technical field more particularly to a kind of radio frequency lightning protection device.
Background technology
Radio frequency lightning protection device is the overvoltage crowbar for radio frequency microwave system (such as communication system), can be made in system to electricity
The expensive equipment of pressure-sensitive sense, such as low acoustic amplifier ﹑ frequency mixers and the receiver of making an uproar is from lightning stroke or the damage of surge.
Frequency microwave antenna system is mounted on outdoor geographical location higher position more because of need of work, it is easy to be struck by lightning or
Induction lightening surge voltage, as long as Guo electricity Ya ﹑ overcurrent enters system between these Shun, receiving device can be burned out, cause immediately
Equipment even personal casualty loss.With modern communication career development, people increasingly pay attention to the protection of communication equipment, international telecommunication
Alliance and China have formulated corresponding standard successively, it is desirable that telecommunication apparatus must be designed with Fang Lei Ji ﹑ electricity Yong ﹑ power inductions
The measure touched with power line, only having passed through relevant criterion could network access use.
Quatrter-wavelength line radio frequency lightning protection device is a kind of traditional lightning protection device.For many years, it is to bear power height, microwave biography
Defeated characteristic good, passive intermodulation PIM are low, simple in structure, lightning protection effect is good, dependable performance, non-maintaining feature, a large amount of extensively to use
It is penetrated in system in various radio-frequency receiving-transmittings.In recent years, with the rapid development of communication science and technology and market, radio frequency system has not been the past
Point frequency or narrowband systems, instead of be multiband and broadband system.In this way, traditional quatrter-wavelength line radio frequency lightning protection
The weakness of device just shows especially out.
Quatrter-wavelength line radio frequency lightning protection device utilizes quarter-wave transformer principle, in working frequency, by branch
The short circuit of line end transforms to the open circuit at access point.The difference for dexterously utilizing working frequency and thunder and lightning frequency spectrum, by lightning energy
Amount is released to ground through branch line, protects rear class equipment.
Quarter-wave concept is to a frequency f0For, in the frequency, transmission line electrical length is 90 degree.Work as frequency departure
f0When, quatrter-wavelength line electrical length is not equal to 90 degree, then converter characteristic change dramatically.Fig. 1 is an example f0=4.1GHz's
The characterisitic family of quatrter-wavelength line radio frequency lightning protection device, parameter are quatrter-wavelength line impedance Z.The impedance is higher,
Corresponding bandwidth of operation is wider.It is 1.10 computation bandwidths by voltage standing wave ratio, as impedance Z=50 Ω, relative bandwidth Δ f=
12.1%；As impedance Z=100 Ω, relative bandwidth Δ f=24.0%；When impedance Z=150 ohm, relative bandwidth Δ f=
35.5%.Obviously, it is to do multiband (such as 2.4GHz and 5.8GHz two-bands) and the lightning protection device of broadband system with it
It is impossible.
Therefore, there is a problem of in traditional technical solution can process bandwidth it is narrow.
Utility model content
The purpose of this utility model is to provide a kind of radio frequency lightning protection devices, it is intended to solve present in traditional technical solution
It can the narrow problem of process bandwidth.
A kind of radio frequency lightning protection device, including outer conductor are equipped in the outer conductor：
Input impedance conversion unit, the input impedance conversion unit include multiple input impedance transformer；
The output impedance converter unit being connect with the input impedance conversion unit, the output impedance converter unit include
Multiple output impedance converters；
Branch line, the first end of the branch line and the input impedance conversion device and the output impedance converter unit
Connects end altogether connects, and the input impedance conversion unit is with the output impedance converter unit about the connects end altogether symmetry arrangement；
Bias unit, the bias unit are connect with the second end of the branch line；
Input line, the input line are connect with the input impedance conversion unit；
Output line, the output line are connect with the output impedance converter unit, the output line and the output line
Impedance is identical.
Further, each input impedance conversion device and each output impedance converter include parallel arrangement of
First linkage section and the second linkage section, first linkage section are in turn connected to form first line, and second linkage section is successively
Connection forms the second circuit.
Further, the bias unit is shorting stub, and the shorting stub is connected to the second end of the branch line and leads outside
Between body.
Further, the bias unit includes the first capacitance and lightning protection component, and first capacitance is connected on the branch
On line, the lightning protection component is in parallel with first capacitance.
Further, the bias unit further includes bias input end, and the bias input end is connected to the lightning protection component
Or the both ends of first capacitance.
Further, the lightning protection component is discharge tube or TVS pipe.
Further, further include the second capacitance, second capacitance is hindered with the input impedance conversion unit or the output
Anti- converter unit series connection.
Further, the material of the branch line is coaxial line.
Further, the material of the input impedance conversion unit and the output impedance converter unit is coaxial line, micro-strip
Line or belt shape line.
Above-mentioned radio frequency lightning protection device is provided with multistage input, output-resistor converter in outer conductor, is converted using impedance
The mapping function of device substantially reduces the system impedance at branch line, is equivalent to and greatly improves the impedance of branch line, to big
Working band is expanded greatly, and radio frequency lightning protection device is simple in structure, lightning protection effect is good.
Description of the drawings
Fig. 1 is the radio frequency lightning protection device electrical block diagram that one embodiment of the utility model provides；
Fig. 2 is the radio frequency lightning protection device electrical block diagram that another embodiment of the utility model provides；
Fig. 3 is the corresponding structural schematic diagram of radio frequency lightning protection device shown in Fig. 2；
Fig. 4 is the corresponding theoretical performance schematic diagram of radio frequency lightning protection device shown in Fig. 2；
Fig. 5 is the radio frequency lightning protection device electrical block diagram that another embodiment of the utility model provides；
Fig. 6 is the radio frequency lightning protection device electrical block diagram that another embodiment of the utility model provides；
Fig. 7 is the structural schematic diagram of branch line in radio frequency lightning protection device in three kinds of embodiments.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As shown in figures 1-6, the utility model provides a kind of radio frequency lightning protection device, including outer conductor, is equipped in outer conductor：It is defeated
Enter impedance converter unit I, output impedance converter unit O, branch line F, bias unit P, input line (not shown) and output line (not
Diagram).
Input impedance conversion unit I is connected with output impedance converter unit O, input impedance conversion unit I and output impedance
Converter unit O is symmetrical about the connects end altogether, first end and input impedance conversion device and the output impedance converter unit O of branch line F
Connects end altogether connection, the second end of branch line F is connect with bias unit P, specifically, the input impedance conversion unit I and institute
The material for stating output impedance converter unit O is coaxial line, microstrip line or strip line, and input impedance conversion unit I includes multiple defeated
Enter impedance transformer, output impedance converter unit O includes multiple output impedance converters, defines each impedance transformer characteristic resistance
Anti- Zi, geometrical length Li, wherein i is positive integer.The output end of input line is connect with the input terminal of input impedance conversion unit I,
The input terminal of output line is connect with the output end of output impedance converter unit O, wherein the impedance value phase of output line and output line
Together.Wherein, include parallel arrangement of first linkage section per level-one input impedance conversion device and per level-one output impedance converter
With the second linkage section, the first above-mentioned linkage section is in turn connected to form first line, and the second above-mentioned linkage section is sequentially connected shape
At the second circuit, first line and the second circuit form parallel line pair, and branch line F is correspondingly provided with a pair of of parallel line, respectively with the
The end of one circuit and the second connection, parallel line is connect with bias unit P.
Specifically, the characteristic impedance of input line is Z0, input line and first order input impedance conversion device I1Input terminal connect
It connects, first order input impedance conversion device I1Characteristic impedance Z1, geometrical length L1, first order input impedance conversion device I1Output
End is connect with the input terminal of second level input impedance conversion device, the characteristic impedance Z of second level input impedance conversion device2, geometry is long
Spend L2, successively, n-th grade of input impedance conversion device InInput terminal connect with the output end of (n-1)th grade of input impedance conversion device, n-th
Grade input impedance conversion device InOutput end and n-th grade of output impedance converter OnInput terminal connection, n-th grade of input impedance conversion
Device InCharacteristic impedance Zn, geometrical length LN,The first end of branch line F and n-th grade of input impedance conversion device InWith n-th grade of output resistance
Resistance parallel operation OnConnects end altogether connection, the second end connection bias unit P, n-th grade of output impedance converter O of branch line FnIt is defeated
Outlet is connect with the input terminal of (n-1)th grade of output impedance converter, n-th grade of output impedance converter OnCharacteristic impedance Zn, geometry
Length Ln, successively, output end and the first order output impedance converter O of second level output impedance converter1Input terminal connection,
The characteristic impedance Z of second level output impedance converter2, geometrical length L2；First order output impedance converter O1Output end and output
Line connects, first order output impedance converter O1Characteristic impedance Z1, geometrical length L1,The characteristic impedance of output line is Z0, input
Input terminal of the input terminal of line as radio frequency lightning protection device, the output end of the output end of output line as radio frequency lightning protection device.
Referring to Fig. 2 and Fig. 3, which constitutes nine yuan by taking two level Four quarter-wave impedance converter units as an example
Part radio frequency lightning protection device.Radio frequency lightning protection device includes outer conductor 10, is equipped with input line 50, input impedance conversion successively in outer conductor 10
Unit 20, branch line 40, output impedance power converter cells 30, output line 60 and bias unit 70.
Wherein, input impedance conversion unit 20 includes first order input impedance conversion device 21, second level input impedance conversion
Device 22, third level input impedance conversion device 23, fourth stage input impedance conversion device 24, the level Four input impedance conversion device from a left side to
The right side is sequentially connected end to end, and output impedance converter unit 30 includes first order output impedance converter 31, the change of second level output impedance
Parallel operation 32, third level output impedance converter 33, fourth stage output impedance converter 34, the level Four impedance transformer is from right to left
It is sequentially connected end to end, the output end of fourth stage input impedance conversion device 24 connects with the input terminal of fourth stage output impedance converter 34
It connects.In order to facilitate arrangement, the size of the output impedance converter in output impedance converter unit 20 from left to right gradually increases, phase
Corresponding, the output impedance transformation converter in output impedance converter unit 30 gradually increases from right to left, and keeps symmetrically setting
It sets.In the present embodiment, the material of input line 50 and output line 60 is coaxial line, and the impedance value of input line 50 and output line 60
50 Ω are taken, the output end of input line 50 is connect with the first order input impedance conversion device 21 in input impedance conversion unit 20, defeated
Enter fourth stage input impedance conversion device 24 in impedance converter unit 20 respectively with branch line 40 and output impedance converter unit 30
In fourth stage output impedance converter 34 input terminal connection, the other end of branch line 40 connects bias unit 70, and biasing is single
Member 70 and 10 short circuit of outer conductor, the output end of the first order output impedance converter 31 in output impedance converter unit 30 with it is defeated
Outlet 60 connects.Wherein, between first order input impedance conversion device 21 and outer conductor 10 be equipped with input terminal dielectric support 70, first
It is equipped with output end dielectric support 80 between grade output impedance converter 31 and outer conductor 10, is respectively used to support input impedance conversion
Unit 20 and output impedance converter unit 30, ensure the stability of structure.
Fig. 4 is the theoretical performance figure of coaxial line circuit in Fig. 3 embodiments.Due to using multistage input and output impedance transformation
Device, radio frequency lightning protection device have expanded the bandwidth of operation of circuit significantly, circuit working band substantially in 680MHz-5900MHz ranges,
When voltage standing wave ratio VSWR=1.1, relative bandwidth reaches 158.7%, more than three octaves.In traditional quatrter-wavelength line
Multistage input and output impedance transformer is increased on the basis of lightning protection device, using the mapping function of impedance transformer, reduces system resistance
It is anti-, to broaden working band.
In the above-described embodiments, bias unit P is shorting stub, is connect with branch line F and outer conductor, in other embodiment
In, as shown in figure 5, bias unit P includes capacitance C1 and lightning protection component G, capacitance C1 is connected on branch line F, lightning protection component G with
Capacitance C1 is in parallel, in the ends branch line F, replaces radio-frequency-short with distribution capacity C1, and access lightning protection component G.Wherein, the lightning protection
Device can be gas-discharge tube or TVS (transient diode, Transient Voltage Suppressor) etc., make lightning protection device
Influences of the part G to circuit PIM (passive intermodulation, Passive intermodulation/Pin) minimizes, and obtains four points of tradition
One of wavelength line lightning protection device level PIM indexs (about -160dBc).
As shown in fig. 6, in order to improve receiving sensitivity, received signal to noise ratio is reduced, Modern Communication System is usually on antenna
Amplifier is set, and requires antenna feeder lightning-proof device that can feed dc power, to power supplies such as antenna amplifier antennafires, the present invention passes through improvement
Circuit increases feeding function, the both ends of lightning protection component or capacitance C1 be equipped with bias input end, the bias input end be used for
Radio frequency lightning protection device input direct-current voltage, makes radio frequency lightning protection device have feeding function.
As shown in fig. 6, further including capacitance C2, capacitance C2 and input impedance conversion unit I or output impedance transformation further
Unit O series connection, preferably, capacitance C2 is connected on the concatenated output ends of output impedance converter unit O.
Fig. 7 is the schematic diagram of several derivative realization methods of branch line in radio frequency lightning protection device in three kinds of embodiments.From a left side to
The right side is followed successively by the realization structure of helix, coaxial spiral line and transition line, can by change branch line physical length, into
One step improves the bandwidth of radio frequency lightning protection device.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (9)
1. a kind of radio frequency lightning protection device, including outer conductor, which is characterized in that be equipped in the outer conductor：
Input impedance conversion unit, the input impedance conversion unit include multiple input impedance transformer；
The output impedance converter unit being connect with the input impedance conversion unit, the output impedance converter unit includes multiple
Output impedance converter；
Branch line, the first end of the branch line and the input impedance conversion device and the output impedance converter unit connect altogether
End connection, the input impedance conversion unit is with the output impedance converter unit about the connects end altogether symmetry arrangement；
Bias unit, the bias unit are connect with the second end of the branch line；
Input line, the input line are connect with the input impedance conversion unit；
Output line, the output line are connect with the output impedance converter unit, the impedance of the output line and the output line
It is identical.
2. radio frequency lightning protection device as described in claim 1, which is characterized in that each input impedance conversion device and each described
Output impedance converter includes parallel arrangement of first linkage section and the second linkage section, and first linkage section is sequentially connected shape
At first line, second linkage section is in turn connected to form the second circuit.
3. radio frequency lightning protection device as described in claim 1, which is characterized in that the bias unit is shorting stub, the shorting stub
It is connected between the second end and outer conductor of the branch line.
4. radio frequency lightning protection device as described in claim 1, which is characterized in that the bias unit includes the first capacitance and lightning protection device
Part, first capacitance are connected on the branch line, and the lightning protection component is in parallel with first capacitance.
5. radio frequency lightning protection device as claimed in claim 4, which is characterized in that the bias unit further includes bias input end, institute
State the both ends that bias input end is connected to the lightning protection component or first capacitance.
6. radio frequency lightning protection device as described in claim 1, which is characterized in that the lightning protection component is discharge tube or TVS pipe.
7. radio frequency lightning protection device as described in claim 1, which is characterized in that further include the second capacitance, second capacitance and institute
State input impedance conversion unit or output impedance converter unit series connection.
8. radio frequency lightning protection device as described in claim 1, which is characterized in that the material of the branch line is coaxial line.
9. radio frequency lightning protection device as described in claim 1, which is characterized in that the input impedance conversion unit and output resistance
The material of anti-converter unit is coaxial line, microstrip line or strip line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721888485.8U CN207691420U (en) | 2017-12-27 | 2017-12-27 | A kind of radio frequency lightning protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721888485.8U CN207691420U (en) | 2017-12-27 | 2017-12-27 | A kind of radio frequency lightning protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207691420U true CN207691420U (en) | 2018-08-03 |
Family
ID=62992605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721888485.8U Active CN207691420U (en) | 2017-12-27 | 2017-12-27 | A kind of radio frequency lightning protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207691420U (en) |
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2017
- 2017-12-27 CN CN201721888485.8U patent/CN207691420U/en active Active
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