CN201294377Y - Quarter-wave wide band feeder line surge protector - Google Patents
Quarter-wave wide band feeder line surge protector Download PDFInfo
- Publication number
- CN201294377Y CN201294377Y CNU2008200647562U CN200820064756U CN201294377Y CN 201294377 Y CN201294377 Y CN 201294377Y CN U2008200647562 U CNU2008200647562 U CN U2008200647562U CN 200820064756 U CN200820064756 U CN 200820064756U CN 201294377 Y CN201294377 Y CN 201294377Y
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- Prior art keywords
- quarter
- wave
- fire
- connector
- outer conductor
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Abstract
The utility model relates to a quarter wavelength broad band feeder line surge protector, which relates to the microwave technique, in particular to the broad band technique of quarter wavelength feeder line surge protectors. The quarter wavelength broad band feeder line surge protector comprises a surge end radio frequency connector, a protection end radio frequency connector, a microwave coaxial transmission line and a quarter wavelength short line, wherein the surge end radio frequency connector and the protection end radio frequency connector are respectively connected with two ends of the microwave coaxial transmission line, the quarter wavelength broad band feeder line surge protector is characterized in that the microwave coaxial transmission line is low impedance compensation, the length is lambda 0/2, the quarter wavelength short line is high impedance compensation, and the length is lambda 0/4. The quarter wavelength broad band feeder line surge protector greatly widens a wave band, and the design is rational and enables the working frequency band width to be bigger than one octave.
Description
Technical field
The utility model relates to microwave technology, specially refers to the wide frequency technology of quarter-wave feedback surge protector.
Background technology
The feeder system of communication apparatus generally all is exposed to outdoor, is easy to suffer thunderbolt and induction lightening ripple.Thunderbolt instantaneous overvoltage from the feeder system introducing, to the injury of communication equipments such as ground satellite station, microwave station, telstar receiving station, mobile communication base station greatly, the large tracts of land strong electromagnetic pulse radiation that when thunderbolt, produces, the instantaneous surge overvoltage that on feeder line, produces, be incorporated on the indoor transceiver, can cause the losing even personnel's injures and deaths of damage, data of equipment.Development along with modern communication, people more and more pay attention to the protection of communication system, International Telecommunications Union has all formulated relevant standard with China, the measure that the regulation telecommunication apparatus must design is anti-lightning strike, surge, power induction and power line touch, and use could network.
The schematic diagram of traditional quarter-wave surge protector is subjected to the restriction of quarter-wave short-circuit line impedance as shown in Figure 1, and its working band is done not wide.From microwave transmission, under a certain system performance impedance and certain voltage standing wave ratio, its relative bandwidth is that the impedance with the quarter-wave short-circuit line increases.Because the quarter-wave short-circuit line impedance of transmitting in same medium is big more, the diameter of its inner wire is just more little.The quarter-wave short-circuit line is the thunder and lightning current by pass of quarter-wave surge protector, and its diameter is more little, just means that the discharge capacity of quarter-wave surge protector is more little.And the diameter of quarter-wave short-circuit line is little has also brought difficulty for processing.So traditional quarter-wave feedback surge protector working band can not be done very widely, relative bandwidth accomplishes 30% at most.
The utility model content
Technical problem to be solved in the utility model provides a kind of working band can be applicable to multi frequency system than broad quarter-wave feedback surge protector.
The technical scheme that the utility model solve the technical problem employing is; quarter-wave wideband feedback surge protector; comprise surge end-fire connector, protection end-fire frequency connector, microwave coaxial transmission line and quarter-wave slug road frequently; surge end-fire connector, protection end-fire frequency connector frequently is connected with the two ends of microwave coaxial transmission line respectively; the microwave coaxial transmission line is the Low ESR compensation, and length is λ
0/ 2; The quarter-wave short-circuit line is a high impedance compensation, and length is λ
0/ 4.Consider the length variations of microwave wavelength in the different medium, λ
0Should be as the criterion with the wavelength of actual working environment.
Described microwave coaxial transmission line is made up of the inner wire and the medium of outer conductor, Low ESR compensation or more piece impedance conversion, is connected to the quarter-wave short-circuit line of high impedance in the conductor, and the other end of quarter-wave short-circuit line is electrically connected with outer conductor.
Surge end-fire connector frequently is made up of inner wire, outer conductor and medium; Protection end-fire connector frequently is made up of inner wire, outer conductor, medium.
The outer conductor of surge end-fire frequency connector, the outer conductor of microwave coaxial transmission line, protection end-fire the outer conductor three of connector frequently are electrical connection.Three's mechanical structure mode is integrated or divides body structure, divides the junction employing of body structure to be threaded or the interference fit connection.
Frequently be provided with the Low ESR compensator section in the connector at the surge end-fire.Frequently be provided with the coplanar compensation structure in the connector at the protection end-fire.
Especially, the microwave coaxial transmission line is provided with multistage quarter-wave stepped impedance collocation structure.
The beneficial effects of the utility model are:
1, microwave coaxial transmission line two ends are provided with two radio frequency connectors, are respectively applied for the surge end and the protection end of radio frequency.The interface of two radio frequency connectors is by the relevant criterion design, and some microwave compensation of do on the basis that connects interchangeability are being satisfied in its inside.Two radio frequency connectors can be various radio frequency connectors such as N, TNC, BNC, L16, SMA, DIN7/16.To adapt to the equipment of various interface form.
2, the microwave coaxial transmission line is made up of inner wire 4, the medium 6 of outer conductor 5, Low ESR compensation or more piece impedance conversion.According to the schematic diagram 1 of quarter-wave short-circuit line in the coaxial line, when the characteristic impedance of communication system is that the impedance of two ends radio frequency connector is Z
0The time, the impedance of supposing the microwave coaxial transmission line is Z
1, the impedance of quarter-wave short-circuit line is Z
2Work as Z
1＜Z
0＜Z
2, impedance is Z
1Design of length become λ
0/ 2, impedance is Z
2Design of length become λ
0/ 4 o'clock, the characteristic curve of its voltage standing wave ratio and frequency in band three trough points of formation as shown in Figure 2, thereby widened frequency band widely, the operational frequency bandwidth that can make reasonable in design is greater than one more than the octave.
Description of drawings
Fig. 1 is the schematic diagram of traditional quarter-wave short-circuit line;
Fig. 2 is the schematic diagram of the utility model example 1;
Fig. 3 is the structural representation of the utility model example 1;
Fig. 4 is the schematic diagram of the utility model example 2.
Mark is as follows among the figure: the R section is a surge end-fire connector frequently, and the S section is the microwave coaxial transmission line, and the T section is protection end-fire frequency connector;
The surge end-fire is inner wire 1, surge end-fire outer conductor 2, surge end-fire medium 6, quarter-wave short-circuit line 7, protection end-fire inner wire 8, protection end-fire outer conductor 9, the protection end-fire medium 10 of connector frequently of connector frequently of connector frequently of outer conductor 5, the microwave coaxial transmission line of inner wire 4, the microwave coaxial transmission line of medium 3, the microwave coaxial transmission line of connector frequently of connector frequently of connector frequently.
Embodiment
Quarter-wave wideband feedback surge protector of the present utility model; comprise surge end-fire connector, protection end-fire frequency connector, microwave coaxial transmission line and quarter-wave slug road frequently; surge end-fire connector, protection end-fire frequency connector frequently is connected with the two ends of microwave coaxial transmission line respectively; the microwave coaxial transmission line is the Low ESR compensation, and equivalent length is λ
0/ 2; The quarter-wave short-circuit line is a high impedance compensation, and equivalent length is λ
0/ 4.
Embodiment 1
The schematic diagram of the novel quarter-wave wideband feedback surge protector of present embodiment has added Low ESR compensation Z in the microwave coaxial transmission line shown in Fig. 2 a, Fig. 2 b
1On the quarter-wave short-circuit line, made high impedance compensation Z
2According to Fig. 2 as can be known, as long as Z
1, Z
2Impedance and Design of length are reasonable, and the characteristic curve of its voltage standing wave ratio and frequency is three trough points of formation in band, thereby have widened frequency band widely, make operational frequency bandwidth greater than one more than the octave.The quarter-wave short-circuit line presents high impedance to useful signal, does not shunt, and does not influence its normal transmission.And lightning wave is presented Low ESR, the lightning current of unimpededly releasing reaches the purpose of protection equipment.
The structural representation of the quarter-wave wideband feedback surge protector of present embodiment is made up of surge end-fire frequency connector, microwave coaxial transmission line, protection end-fire frequency connector as shown in Figure 3.The microwave coaxial transmission line is made up of outer conductor 5, Low ESR compensation inner wire 4, medium 6.Be connected to the quarter-wave short-circuit line 7 of high impedance on inner wire 4, the other end of quarter-wave short-circuit line is connected with outer conductor 5.Surge end-fire connector frequently is made up of inner wire 1, outer conductor 2, medium 3.Protection end-fire connector frequently is made up of inner wire 8, outer conductor 9, medium 10.The outer conductor 2 of surge end-fire frequency connector, the outer conductor 5 of microwave coaxial transmission line, protection end-fire outer conductor 9 threes of connector frequently are electrical connection.When design, can adopt integral structure and divide body structure.Two junctions of branch body structure can be adopted and are threaded or the interference fit connection.
According to the schematic diagram of quarter-wave short-circuit line in the coaxial line as can be known, the Design of length of microwave coaxial transmission line can be become λ
0/ 2 Low ESR Z
1Compensation is designed to Z with the quarter-wave short-circuit line
2High impedance compensation.The impedance of supposing system is Zo=50 Ω, and the design curve of quarter-wave short-circuit line in the coaxial line is looked in standing-wave ratio≤1.2, in the time of can getting bandwidth by 120% design, and its Z
1=0.8Zo=40 Ω, Z
2=2Zo=100 Ω.Characteristic impedance formula according to known coaxial line
Can determine Z
1And Z
2The internal and external conductor diameter.If standing-wave ratio has required conversion, the characteristic impedance Z that finds so
1And Z
2Value is just different, and corresponding internal and external conductor diameter is also just different.
Because the discontinuity that tolerance that raw material, machining occur and dielectric support place bring, the not desirable as described above standing-wave ratio of the product that actual production is gone out≤1.2, before not have to compensate the standing-wave ratio of actual product be≤1.3.Also to carry out some other compensation for this reason.Fig. 3 embodiment 1 has just done a joint Low ESR compensation on the connector frequently at the surge end-fire, as the A place of Fig. 3.Cut out part formation circular groove at the end face of protecting end-fire frequency connector medium and realize coplanar compensation, as the B place of Fig. 3.Thereby overcome the microwave transmission inhomogeneities that raw material, mismachining tolerance and discontinuity are brought.Make product the standing-wave ratio of design in the frequency band by≤1.3 bring up to≤1.2.
Fig. 4 is the schematic diagram of the utility model example 2.It is to increase multistage to compensate and realize opening up frequently on the basis of example 1.Principle according to the n level quarter-wave stepped impedance transformer of " the general passive device of coaxial-type TEM mould ", the microwave coaxial transmission line can adopt multistage quarter-wave step impedance conversion to increase working band, as the Z0 among the figure, Z11, Z12...Z1n.Because ladder has increased, the characteristic impedance between adjacent two ladders changes and reduces, so the reflection that each ladder produces is just little, thereby has widened working band.Take high impedance conversion of arriving low or low according to the situation of microwave compensation, to realize the function of widening of frequency to high various combinations.Its medium can be the blending agent of air, polytetrafluoroethylene or air and polytetrafluoroethylene.Its inner and outer conductor diameter designs according to different impedances.
Claims (8)
1, quarter-wave wideband feedback surge protector; comprise surge end-fire connector, protection end-fire frequency connector, microwave coaxial transmission line and quarter-wave slug road frequently; surge end-fire connector, protection end-fire frequency connector frequently is connected with the two ends of microwave coaxial transmission line respectively; it is characterized in that; the microwave coaxial transmission line is the Low ESR compensation, and length is λ
0/ 2; The quarter-wave short-circuit line is a high impedance compensation, and length is λ
0/ 4.
2, quarter-wave wideband feedback surge protector as claimed in claim 1; it is characterized in that; described microwave coaxial transmission line is made up of inner wire (4) medium (6) of outer conductor (5), Low ESR compensation or more piece impedance conversion; be connected to the quarter-wave short-circuit line (7) of high impedance on inner wire (4), the other end of quarter-wave short-circuit line is electrically connected with outer conductor (5).
3, quarter-wave wideband feedback surge protector as claimed in claim 1 is characterized in that, surge end-fire connector frequently is made up of inner wire (1), outer conductor (2) and medium (3); Protection end-fire connector frequently is made up of inner wire (8), outer conductor (9), medium (10).
4, quarter-wave wideband feedback surge protector as claimed in claim 1; it is characterized in that the outer conductor (2) of surge end-fire frequency connector, the outer conductor (5) of microwave coaxial transmission line, protection end-fire outer conductor (9) three of connector frequently are electrical connection.
5, quarter-wave wideband feedback surge protector as claimed in claim 4; it is characterized in that; the outer conductor (2) of surge end-fire frequency connector, the outer conductor (5) of microwave coaxial transmission line, protection end-fire outer conductor (9) three's of connector mechanical structure mode frequently are integrated or divide body structure, divide the junction employing of body structure to be threaded or the interference fit connection.
6, quarter-wave wideband feedback surge protector as claimed in claim 3 is characterized in that, is provided with the Low ESR compensator section in the connector frequently at the surge end-fire.
7, quarter-wave wideband feedback surge protector as claimed in claim 3 is characterized in that, is provided with the coplanar compensation structure in the connector frequently at the protection end-fire.
8, quarter-wave wideband feedback surge protector as claimed in claim 1 is characterized in that, the microwave coaxial transmission line is provided with multistage quarter-wave stepped impedance collocation structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200647562U CN201294377Y (en) | 2008-08-18 | 2008-08-18 | Quarter-wave wide band feeder line surge protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200647562U CN201294377Y (en) | 2008-08-18 | 2008-08-18 | Quarter-wave wide band feeder line surge protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201294377Y true CN201294377Y (en) | 2009-08-19 |
Family
ID=41007858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200647562U Expired - Fee Related CN201294377Y (en) | 2008-08-18 | 2008-08-18 | Quarter-wave wide band feeder line surge protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201294377Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092203A (en) * | 2014-06-26 | 2014-10-08 | 南京信息工程大学 | Microwave signal surge protection device with transmission line input impedance design |
-
2008
- 2008-08-18 CN CNU2008200647562U patent/CN201294377Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092203A (en) * | 2014-06-26 | 2014-10-08 | 南京信息工程大学 | Microwave signal surge protection device with transmission line input impedance design |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20140818 |
|
| EXPY | Termination of patent right or utility model |