CN110533861A - The coupled mode leakage coaxial cable of indoor security can be achieved - Google Patents
The coupled mode leakage coaxial cable of indoor security can be achieved Download PDFInfo
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- CN110533861A CN110533861A CN201910841591.8A CN201910841591A CN110533861A CN 110533861 A CN110533861 A CN 110533861A CN 201910841591 A CN201910841591 A CN 201910841591A CN 110533861 A CN110533861 A CN 110533861A
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- leakage coaxial
- coaxial cable
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
- G08B13/2497—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field using transmission lines, e.g. cable
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Waveguide Aerials (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The present invention relates to a kind of coupled mode leakage coaxial cables of achievable indoor security, with several equidistant leakage coaxial cables side by side, multiple notches are equidistantly opened up on the leakage coaxial cable along axial direction, the notch direction arrangement of adjacent two leakage coaxial cables forms an angle, so that adjacent two leakage coaxial cable radiation signals is intercoupled so that preceding valve is maximum and back lobe is minimum.The present invention solves the problems, such as the radiation characteristic of the coupled mode leakage coaxial cable suitable for different application scene demand, propose several leakage cable notching construction, so that the preceding valve of leakage cable near-field thermal radiation meets detection angle requirement, and back lobe is much smaller than preceding valve, after guaranteeing leaky cable embedment wall, next room, which is next to the wall, will not occur false triggering when walking about.
Description
Technical field
The present invention relates to a kind of signal transmission coaxial-cables, and in particular to a kind of coupled mode leakage of achievable indoor security
Coaxial cable.
Background technique
With the increasingly raising of people's living standard, people start pursue family life modernization, living environment comfortableization,
Safe etc..Smart home is also given birth to therewith thus.Security precautions technology is essential in Internet of Things and smart home system
Technology, cell and indoor family monitoring, home security alarm etc. fields be all widely used.However current smart home
There are two main problems to cause rate of false alarm and rate of failing to report higher for security product, especially burglar alarm product: first is that phase next door
Between or next door be easy false triggering；Second is that animal and people's (causing easily to be alarmed by triggerings such as pet or mouse) cannot be distinguished.
Existing coupled mode leaky cable is as shown in Fig. 2, the spacing for the slot 5 opened on external conductor 2 in cable cover(ing) 1 is remote
Less than operation wavelength.Since slot 5 is much smaller than wavelength, electromagnetic field makees external radiation weak electromagnetic field by pinhole difiration
With distance shorter (one to two meters).When people is close to leakage cable, since human body is conductor, by the electromagnetic wave phase interaction with radiation,
Stronger echo is generated in leakage cable.By detecting this echo-signal, so that it may learn the position of invader and alarm.Coupled mode
The adjacent notch radiated electromagnetic wave of leaky cable intercouples, as shown in figure 3, when human body close to when can it is immediate all leakage
Same position in cable generates stronger echo simultaneously.And toy height is lower, it can only be in several (such as 1-2 roots) of bottom
Stronger echo is generated in leakage cable.People and the toy that invasion can be distinguished by this principle avoid toy (pet and old
Mouse etc.) it causes to report by mistake.
This project is dedicated to solving both of these problems and be applicable in by the radiation mode of design coupled mode leakage coaxial cable
In different application scenarios.
Cable periodically or non-periodically configures the slot of certain shapes along the external conductor of coaxial cable, along coaxial electrical
Each slot of cable axial direction is an electromagnetic radiation source, can be electromagnetic energy while electric signal transmits in the cable
Sub-fraction as required from slot in the form of an electromagnetic wave along be radiated the exterior space of surrounding.
Summary of the invention
The technical problem to be solved in the present invention is that for deficiency existing for above-mentioned existing leakage cable, and providing one kind can be real
The coupled mode leakage coaxial cable of existing indoor security, by leaking cable fluting optimization design to coupled mode, to be suitable for different answer
Use scene.Before preceding valve including leaking cable near-field thermal radiation meets detection angle requirement (180 degree or bigger), and back lobe is much smaller than
Valve, after guaranteeing leaky cable embedment wall, next room, which is next to the wall, will not occur false triggering when walking about, reduce rate of false alarm；Simultaneously
The principle that cable detects simultaneously is leaked by more coupled modes, distinguishes people and the toy of invasion, reduces rate of false alarm.
The present invention solves above-mentioned technical problem and adopts the following technical scheme that
A kind of coupled mode leakage coaxial cable of achievable indoor security, having several, leakage is coaxial at equal intervals side by side
Cable equidistantly opens up multiple notches, the notch side of adjacent two leakage coaxial cables along axial direction on the leakage coaxial cable
Form an angle to arrangement, adjacent two leakage coaxial cable radiation signals made to intercouple so that preceding valve is maximum and back lobe most
It is small.
Further, the spacing between the adjacent leakage coaxial cable is 30-50cm, guarantees adjacent two leakages
The notch leakage signal mutually closed between coaxial cable intercouples.
Further, the distance between notch mutually closed on the adjacent leakage coaxial cable is L=20cm, remote small
In signal wavelength.
Further, it is arranged in angle of 45 degrees between the notch mutually closed on the adjacent leakage coaxial cable.
Further, the leakage coaxial cable uses low frequency signal source, and notch size is much smaller than signal wavelength, radiates micro-
It is weak, leaking electromagnetic wave EFFECTIVE RANGE only near cable in 1-2 meters of ranges.
Further, several different shapes and sizes and vertically and horizontally arranged can be used on equidistant leakage coaxial cable side by side
The notch of mode, to be suitable for different application scenarios.
Further, the notch is using one of F type, E type, H-type, T-type and ellipse notch.
Further, the coupled mode leakage coaxial cable can distinguish humans and animals, and several coupled modes of bottom are let out
It leaks in coaxial cable and strong echo is generated to the lower toy of height, when several coupled modes leakage for having the passed through layer of toy
When near coaxial cable, alarm will not be triggered, i.e. coupled mode leakage cable can distinguish people and toy.
Detailed description of the invention
Fig. 1 is the schematic diagram that more leakage cables intercouple；
Appended drawing reference: L. notch spacing, d. leak cable spacing；
Fig. 2 is the structural schematic diagram of existing leakage coaxial cable；
Appended drawing reference: 1. cable cover(ing)s, 2. external conductors, 3. dielectrics, 4. inner conductors, 5. slots
Fig. 3 is the radiative process schematic diagram of existing coupled mode leaky cable；
Appended drawing reference: d. slot spacing；
Fig. 4 is the schematic diagram of humans and animals triggering leakage cable；
Appended drawing reference: the spacing of L1. people to wall, the spacing of L2. animal to wall；
Fig. 5 is the leaky cable with E type, H-type, T-type and ellipse notch and the signal of radiation characteristic direction of the invention
Figure；
Wherein: 5.1 be E type groove mouth lateral arrangement, and 5.2 be H-type groove mouth lateral arrangement, and 5.3 are vertically arranged for H-type groove mouth,
5.4 are vertically arranged for T-slot mouth, and 5.5 be ellipse notch lateral arrangement；
Fig. 6 is of the invention with E type, the leaky cable of F type groove mouth and radiation characteristic direction schematic diagram；
Wherein: 6.1 are vertically arranged for E type groove mouth, and 6.2 are vertically arranged for F type groove mouth；
Fig. 7 is of the invention with F type, the leaky cable of T-slot mouth and radiation characteristic direction schematic diagram；
Wherein: 7.1 be F type lateral arrangement, and 7.2 be T-type lateral arrangement, L. slot period of change length；D. notch is inclined
From amount.
Specific embodiment
With reference to embodiment and referring to attached drawing, the present invention is described in more detail.It should be understood that these are retouched
It states and is only exemplary, and be not intended to limit the scope of the invention.In addition, in the following description, be omitted to known features and
The description of technology, so as not to unnecessarily obscure the concept of the present invention.
Such as Fig. 1, shown in Fig. 4-7, a kind of coupled mode leakage coaxial cable of achievable indoor security, along several (ratios
Such as 2 or 4), it can also equidistantly be arranged side by side according to application demand using more roots, spacing generally uses 30 to arrive
50cm, can also using other values, (such as d=30cm guarantees the slot mutually closed between adjacent two cables according to application demand
Mouthful leakage signal intercouples) in the axial direction of the leaky cable of arrangement, equidistantly opened up at a distance of several distances (such as L=20cm)
The notch direction arrangement of notch, adjacent two leakages cable forms an angle (such as 45 °), keeps adjacent two leakages cable radiation signal mutual
Coupling so that preceding valve is very big and back lobe very little.
Using low frequency signal source (such as 30MHz), notch size is much smaller than signal wavelength, and radiation is faint, and electromagnetic wave is effective
Operating distance is only being leaked near cable within the scope of one two meters.The notch spacing (such as L=20mm) opened up on leaky cable is much smaller than
Signal wavelength.
Leaky cable is in notch shape, the difference of size and vertically and horizontally arranged mode, to be suitable for different application scenarios.
When there is toy (such as pet and mouse etc.) by near leakage cable, alarm will not be triggered, i.e. coupled mode leaks cable
People and toy can be distinguished.
Fig. 4 is four leakage cables are placed side by side in wall at a certain distance (such as 30cm), the letter of corresponding four notches
Number intercouple, establish coupled electromagnetic field around the wall within the scope of 1-2m, toy close to when, due to toy height compared with
It is low, can only several (such as the 1-2 roots) of bottom leak cable in generate stronger echo, when people close to when, all leakage cables can be caused
Strong echo is generated, so as to cause alarm.
5.1-5.5 in Fig. 5 into Fig. 6 6.1,6.2 is designed with F type, the E type, H of vertical and horizontal two kinds of placement directions respectively
The leakage cable of five kinds of type, T-type and ellipse notches,
7.1 in Fig. 7,7.2 be the leakage cable designed with the F type of lateral two kinds of placement directions and T-slot mouth respectively.
When width of rebate is greater than the 1/3 of inner conductor circumference, the size of back lobe and preceding valve are suitable, when width of rebate is less than
Inner conductor circumference 1/4 when, 180 degree is not achieved in the radiation scope of preceding valve, to make the back lobe of antenna pattern much smaller than preceding valve,
Width of rebate should be between the 1/4-1/3 of inner conductor circumference.Indoors when security protection, different leakage cable notching constructions is designed
To be adapted to different application scenarios.
Radiation characteristic directional diagram shown in fig. 5, feature are that back lobe is relatively large, but preceding valve meets the detection requirement of 180 degree
And radiation scope is larger, this notching construction is adapted to thicker wall.
Radiation characteristic directional diagram shown in fig. 6, feature is back lobe much smaller than preceding valve, but the detection of preceding valve requires to be not achieved
180 degree and radiation scope is smaller.This notching construction is adapted to relatively thin wall, and when back lobe is sufficiently small, people is relatively thin in wall
Next room is walked about by wall can be to avoid false alarm.
Radiation characteristic directional diagram shown in Fig. 7, feature is preceding 270 degree of valve satisfaction of detection requirement and radiation scope is big, this
The detection that the fluting of kind structure is adapted on the outside of 90 degree of corners (detection angle can be close to 270 degree).
The example that the present invention has is as follows:
(1) it by taking E shape mode of grooving as an example, as can be seen that back lobe is much smaller than preceding valve from 6.1 in radiation direction Fig. 6, protects
After demonstrate,proving leaky cable embedment wall, with the electromagnetic wave phase interaction of leakage cable radiation when people's next door room is walked about by wall, keep away
Exempt from that false alarm occurs.
(2) due to interior architecture the characteristics of, electromagnetic wave propagation will receive reflection, refraction, scattering and multipath effect etc.
It influences.When leaking cable for intrusion detection, using the low frequency signal of tens MHz frequencies, in addition radiation is very faint, electromagnetic wave is effectively made
It is only being leaked near cable within the scope of one two meters with distance；And it leaks and opens up multiple notches along cable, this itself is also a multipath letter
Number.But detect when, by source signal (certain modulation train of pulse) and receive signal amplitude auto-correlation and phase auto-correlation, into
Row despreading auto-correlation, can distinguish the signal that each notch receives, so that multipath effect bring be avoided to influence well.
(3) notch leaked on cable outer conductor is staggered, the electromagnetic wave phase interaction leaked out from notch, electromagnetic energy
The lesser mode of the larger rear semicircle of semicircle was diffused in around cable in the past, from antenna pattern: preceding valve is very big and back lobe
Very little, to reach indoor security effect.
(4) such as Fig. 4, when coupled mode leakage more, cable is laid side by side, two leakage cables are (such as 30cm) separated by a distance, small when having
Animal close to when, since toy height is lower, can only be leaked at several (such as the 1-2 roots) of bottom and generate relatively strong return in cable
Wave, when people close to when, all leakage cables can be caused to generate strong echo, so as to cause alarm.
Claims (8)
1. there are a kind of coupled mode leakage coaxial cable of achievable indoor security several to leak coaxial electrical at equal intervals side by side
Cable, it is characterised in that: equidistantly open up multiple notches, adjacent two leakage coaxial cables on the leakage coaxial cable along axial direction
Notch direction arrangement form an angle, so that adjacent two leakage coaxial cable radiation signals is intercoupled, so that preceding valve is maximum
And back lobe is minimum.
2. the coupled mode leakage coaxial cable of achievable indoor security according to claim 1, it is characterised in that: adjacent
Spacing between the leakage coaxial cable is 30-50cm, is mutually closed between adjacent two leakage coaxial cables of guarantee
Notch leakage signal intercouples.
3. the coupled mode leakage coaxial cable of achievable indoor security according to claim 1, it is characterised in that: adjacent
The distance between notch mutually closed on the leakage coaxial cable is L=20cm, is much smaller than signal wavelength.
4. the coupled mode leakage coaxial cable of achievable indoor security according to claim 1, it is characterised in that: adjacent
It is arranged in angle of 45 degrees between the notch mutually closed on the leakage coaxial cable.
5. the coupled mode leakage coaxial cable of achievable indoor security according to claim 1, it is characterised in that: described to let out
Leak coaxial cable use low frequency signal source, and notch size be much smaller than signal wavelength, radiate it is faint, make electromagnetic wave useful effect away from
From only near leakage cable in 1-2 meters of ranges.
6. the coupled mode leakage coaxial cable of achievable indoor security according to claim 1, it is characterised in that: Ruo Gangen
The notch of different shapes and sizes and vertically and horizontally arranged mode can be used on equidistant leakage coaxial cable, side by side to be suitable for not
Same application scenarios.
7. the coupled mode leakage coaxial cable of achievable indoor security according to claim 6, it is characterised in that: the slot
Mouth is using one of F type, E type, H-type, T-type and ellipse notch.
8. the coupled mode leakage coaxial cable of -7 any achievable indoor securities according to claim 1, it is characterised in that:
The coupled mode leakage coaxial cable can distinguish humans and animals, to body in several coupled mode leakage coaxial cables of bottom
High lower toy generates strong echo, when near several coupled mode leakage coaxial cables for having the passed through layer of toy,
Alarm will not be triggered, i.e. coupled mode leakage cable can distinguish people and toy.
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| CN201910841591.8A CN110533861A (en) | 2019-09-06 | 2019-09-06 | The coupled mode leakage coaxial cable of indoor security can be achieved |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910841591.8A CN110533861A (en) | 2019-09-06 | 2019-09-06 | The coupled mode leakage coaxial cable of indoor security can be achieved |
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Citations (5)
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|---|---|---|---|---|
| CN102201615A (en) * | 2010-03-23 | 2011-09-28 | 索尼公司 | Bundled leaky transmission line, communication device, and communication system |
| CN202268463U (en) * | 2011-09-19 | 2012-06-06 | 哈尔滨工程大学 | Broadband leaky coaxial cable used for underground track wireless communication |
| CN105789799A (en) * | 2016-04-01 | 2016-07-20 | 通号（郑州）轨道交通科技有限公司 | Leakage waveguide for rail transport vehicle-ground wireless transmission comprehensive carrying communication system |
| CN208722363U (en) * | 2018-09-03 | 2019-04-09 | 南京国沃电子科技有限公司 | A kind of pulse type electronic fence perimeter alarm system |
| CN209216239U (en) * | 2019-01-26 | 2019-08-06 | 大连交通大学 | A kind of detection of airport circumference laser anti-intrusion and identifying system |
-
2019
- 2019-09-06 CN CN201910841591.8A patent/CN110533861A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN102201615A (en) * | 2010-03-23 | 2011-09-28 | 索尼公司 | Bundled leaky transmission line, communication device, and communication system |
| CN202268463U (en) * | 2011-09-19 | 2012-06-06 | 哈尔滨工程大学 | Broadband leaky coaxial cable used for underground track wireless communication |
| CN105789799A (en) * | 2016-04-01 | 2016-07-20 | 通号（郑州）轨道交通科技有限公司 | Leakage waveguide for rail transport vehicle-ground wireless transmission comprehensive carrying communication system |
| CN208722363U (en) * | 2018-09-03 | 2019-04-09 | 南京国沃电子科技有限公司 | A kind of pulse type electronic fence perimeter alarm system |
| CN209216239U (en) * | 2019-01-26 | 2019-08-06 | 大连交通大学 | A kind of detection of airport circumference laser anti-intrusion and identifying system |
Non-Patent Citations (2)
| Title |
|---|
| 刘源，李建杰，王宁，于慧洁，梁晨: "《基于分布式传感器的室内安防报警系统可行性研究》", 《河南科技学院学报（自然科学版）》 * |
| 刘源，李建杰，王宁，于慧洁，梁晨: "《耦合型漏泄同轴电缆传输和耦合特性研究》", 《电波科学学报》 * |
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Application publication date: 20191203 |