CN205646145U - Ultra wide band dipolar antenna - Google Patents
Ultra wide band dipolar antenna Download PDFInfo
- Publication number
- CN205646145U CN205646145U CN201620433106.5U CN201620433106U CN205646145U CN 205646145 U CN205646145 U CN 205646145U CN 201620433106 U CN201620433106 U CN 201620433106U CN 205646145 U CN205646145 U CN 205646145U
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Abstract
The utility model discloses an ultra wide band dipolar antenna, metal radiation arm symmetry is printed in insulating medium plate's front, the interval has been predetermine between the metal radiation arm, it holds as respective feed to be equipped with input port respectively on two metal radiation arms of neighbouring spaced, electric connection is held with the feed of two metal radiation arms respectively to impedance transformer's balanced output end, impedance transformer's input links to each other with coaxial connector's one end, the wall radar was worn to this coaxial connector's the other end and ultra wide band transmitter or receiver link to each other, the metallic shield chamber is located insulating medium plate directly over, the inside packing in this metallic shield chamber has absorbing material. The utility model has the characteristics of the work tape is roomy, time domain radiation characteristic is good, long -pending little, the compact structure of antenna body and profile smoothness etc, its current feeding system is simple, easily processes and maintains, can satisfy the portable miniaturized radar system's of ultra wide band engineering demand.
Description
Technical field
This utility model belongs to ultra-broadband wall-through Radar Antenna System field, is specifically related to a kind of ultra broadband dipole sky
Line.
Background technology
Ultra-broadband wall-through radar is a kind of can to realize the novel realtime imaging radar system of target acquisition and location by partition wall,
It penetrates the non-metal barriers such as concrete, wood, brick, sun-dried mud brick in building by the pulse that transmitting a kind of persistent period is extremely short
Personnel and internal structure carry out non-invasive imaging and follow the tracks of detection, and have and do not damage detected body of wall, high detection point
The advantages such as resolution and high workload efficiency.In recent years, along with Urbanization Construction constantly advances, China's urban infrastructure construction, city
City's building construction, industry have also been obtained fast development with energy base construction and Transport Facility Construction, utilize ULTRA-WIDEBAND RADAR
Detection Techniques carry out investigation and start to obtain extensively application hidden dangers in project.
Antenna is a vital ingredient in ultra-broadband wall-through radar system, plays and believes to emission radar
Number and receive detected target echo-signal dual function, the quality of its performance directly affect whole radar system detection essence
Degree and detection range.It is limited to radar signal at metope scattering interference and the decay in body of wall medium and detected target radar
The uncertainty of scattering section, it is contemplated that the portable miniaturized demand in practical engineering application, therefore it is required that antenna has good
Good radiation characteristic, ultra-wide band characteristic, lightweight and low profile characteristic.
Be currently used for butterfly antenna that the antenna of ultra-broadband wall-through radar mainly has resistance capacitance to load, electromagnetic horn and
Vivaldi antenna, the butterfly antenna the most especially loaded based on impedance.Although the butterfly antenna that impedance loads has preferably Jie
Matter coupled characteristic and time-domain radiation waveform, but radiation efficiency is poor, affects radar actual detection distance；Electromagnetic horn and
Vivaldi antenna near-earth coupling is poor, and has bigger laterally and longitudinally size, is unfavorable for miniaturization and the collection of system
Cheng Hua, affects Through-Wall Radar System application in Practical Project.Therefore, develop one and both there is small size, have again and compare
The ultra-wideband antenna of good gain, has great significance for Miniaturized portable ultra-broadband wall-through radar system.
Summary of the invention
This utility model solve the technical problem that there is provided one can be applied to ground, body of wall etc. shelter lower target visit
The ultra wide band dipolar antenna surveyed.
This utility model adopts the following technical scheme that for solving above-mentioned technical problem, ultra wide band dipolar antenna, its feature
It is to include metal radiation arm, insulation medium board, metallic enclosure, impedance transformer, absorbing material and coaxial connector, wherein
Metal radiation arm symmetry is printed on the front of insulation medium board, and the transverse cross-sectional shape of this metal radiation arm can be by following curve table
Show:, 0≤t≤0.5, x is the long axis direction of metal radiation arm, and y is the short of metal radiation arm
Direction of principal axis, is preset with interval between metal radiation arm, two metal radiation arms of adjacent partition are respectively equipped with input port and make
For respective feed end, impedance transformer is to have 1:2 impedance transformation function and the uneven micro-strip to balanced output characteristic
Feed structure, this impedance transformer balance output end is electrically connected with the feed end of two metal radiation arms respectively, for impedance
Coupling, impedance transformer input is connected with one end of coaxial connector, the other end of this coaxial connector and ultra-broadband wall-through
The transmitter of radar or receiver are connected, and metallic enclosure is positioned at the surface of insulation medium board, the inside of this metallic enclosure
It is filled with absorbing material.
Further preferably, the spacing distance preset between described metal radiation arm is 1.5-2.5mm.
Further preferably, described insulation medium board is the epoxy resin fiberglass cloth dielectric-slab that one side covers copper, and it is thick
Degree is 1mm, and dielectric constant is 4.4, and this insulation medium board is fixed at the bottom end opening of metallic enclosure.
Further preferably, described metallic enclosure is the rectangular cavities of bottom surface opening, and its height is center of antenna frequency
The 1/8 of corresponding free space wavelength, according to simulation optimization design result, the size of described metallic enclosure is: length
100mm, width 60mm, highly 20mm.
Further preferably, described impedance transformer is for having 1:2 impedance transformation function and uneven 50 Ω to 100 Ω
The microstrip feed structures of balanced output characteristic.This impedance transformer is included FR4 dielectric-slab and is printed by printed-board technology
In the metallic conductor of FR4 dielectric-slab front and back, the dielectric constant of FR4 dielectric-slab is 4.4, and thickness is 1.5mm, a length of
38mm, width is that the front of 20mm, FR4 dielectric-slab is provided with the most parallel rectangular metal conductor with via and centre is wide by two
Holding narrow strip metal conductor, the length of strip metal conductor is consistent with the length of FR4 dielectric-slab, the length on narrow limit, its two ends and
Width is respectively 10mm and 3mm, and the length and width of middle broadside is respectively 18mm and 3.8mm, and narrow limit, two ends is connected to
The middle part of middle broadside, narrow limit, two ends is 6.6mm with the distance on FR4 dielectric-slab base, and rectangular metal conductor is led with strip metal
In the middle of body, the length of broadside is consistent and this rectangular metal conductor is arranged at the surface of broadside, rectangle in the middle of strip metal conductor
In the middle of metallic conductor and strip metal conductor, the distance on long limit is 0.2mm, rectangular metal conductor be respectively provided on two sides with symmetry
And radius is the via of 0.5mm, the back side of FR4 dielectric-slab is provided with symmetrical semi-arched metallic conductor, semi-arched metal
The horizontal bottom of conductor is 3mm with the distance on FR4 dielectric-slab base, a length of 2mm of this horizontal bottom, semi-arched metal
The vertical outer side edges of conductor overlaps with the side of FR4 dielectric-slab, a length of 11mm of this vertical outer side edges, semi-arched metallic conductor
Level on a length of 14mm, a length of 3.2mm of the vertical inner side edge of semi-arched metallic conductor on base, vertical inner side edge
The medial extremity of bottom and horizontal bottom passes through arc transition, and semi-arched metallic conductor is provided with and rectangular metal conductor via phase
To and the consistent via of radius.
Further preferably, described absorbing material is all in close contact with metallic enclosure and insulation medium board, this suction ripple material
The material of material is multilayer polyurethane foam, and relative dielectric constant is 2.2, and electrical conductivity is 0.125S/m.
Further preferably, described coaxial connector is installed on the back side of insulation medium board.
This utility model has that work strip is roomy, Time Domain Radiation Characteristics good, antenna volume is little, compact conformation and profile are put down
The features such as cunning, this ultra wide band dipolar antenna feeding classification is simple, it is easy to processes and safeguards, it is possible to meet ultra broadband portable little
The engineering demand of type radar system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is this utility model middle impedance changer Facad structure schematic diagram；
Fig. 3 is this utility model middle impedance changer structure schematic diagram；
Fig. 4 is voltage standing wave ratio curve of the present utility model；
Fig. 5 is gain curve of the present utility model；
Fig. 6 is radiation waveform curve before and after 0.5m position receives on this utility model system axis direction.
In figure: 1, metal radiation arm, 2, insulation medium board, 3, metallic enclosure, 4, impedance transformer, 5, absorbing material,
6, coaxial connector, 7, FR4 dielectric-slab, 8, rectangular metal conductor, 9, strip metal conductor, 10, semi-arched metallic conductor.
Detailed description of the invention
Particular content of the present utility model is described in detail in conjunction with accompanying drawing.Fig. 1 is the structural representation of ultra wide band dipolar antenna
Figure, as it is shown in figure 1, this ultra wide band dipolar antenna includes that metal radiation arm 1, insulation medium board 2, metallic enclosure 3, impedance become
Parallel operation 4, absorbing material 5 and coaxial connector 6, wherein metal radiation arm 1 symmetry is printed on the front of insulation medium board 2, this gold
The transverse cross-sectional shape belonging to radiation arm 1 can be represented by following curve:, 0≤t≤0.5, x is gold
Belonging to the long axis direction of radiation arm 1, y is the short-axis direction of metal radiation arm 1, is preset with interval between metal radiation arm 1, neighbouring between
Every two metal radiation arms 1 on be respectively equipped with input port as respective feed end, impedance transformer 4 is for having 1:2 resistance
Anti-mapping function and the uneven microstrip feed structures to balanced output characteristic, the balance output end of this impedance transformer 4 divides
The not feed ends with two metal radiation arms 1 are electrically connected with, for impedance matching, the input of impedance transformer 4 with coaxially connect
The one end connecing device 6 is connected, and the other end of this coaxial connector 6 is connected with transmitter or the receiver of ultra-broadband wall-through radar, gold
Belonging to shielding cavity 3 and be positioned at the surface of insulation medium board 2, the inside of this metallic enclosure 3 is filled with absorbing material 5.
The spacing distance preset between described metal radiation arm 1 is 1.5-2.5mm, two metal radiations of adjacent partition
Input port it is respectively equipped with as respective feed end on arm 1, can be according to antenna technology index requests such as input impedances to two
Interval between metal radiation arm 1 is adjusted.
Described insulation medium board 2 covers the epoxy resin fiberglass cloth dielectric-slab of copper for one side, and its thickness is 1mm, is situated between
Electric constant is 4.4, and this insulation medium board 2 is fixed at the bottom end opening of metallic enclosure 3.
The described rectangular cavities that metallic enclosure 3 is bottom surface opening, its height is the freedom that center of antenna frequency is corresponding
The 1/8 of space wavelength, according to simulation optimization design result, the size of described metallic enclosure 3 is: length 100mm, width
60mm, highly 20mm.
Described impedance transformer 4 is special for having 1:2 impedance transformation function and uneven 50 Ω to 100 Ω Differential Output
The microstrip feed structures of property.This impedance transformer includes FR4 dielectric-slab 7 and is printed in FR4 medium by printed-board technology
The metallic conductor of plate 7 front and back, the dielectric constant of FR4 dielectric-slab 7 is 4.4, and thickness is 1.5mm, a length of 38mm, width
Front for 20mm, FR4 dielectric-slab 7 is provided with the most parallel rectangular metal conductor 8 with via and width two ends, centre are narrow
Strip metal conductor 9, the length of strip metal conductor 9 is consistent with the length of FR4 dielectric-slab 7, the length on narrow limit, its two ends and width
Degree is respectively 10mm and 3mm, and the length and width of middle broadside is respectively 18mm and 3.8mm, during narrow limit, two ends is connected to
Between the middle part of broadside, narrow limit, two ends is 6.6mm with the distance on FR4 dielectric-slab 7 base, and rectangular metal conductor 8 is led with strip metal
The length of the middle broadside of body 9 is unanimously and this rectangular metal conductor 8 is arranged at the surface of the middle broadside of strip metal conductor 9,
The distance on rectangular metal conductor 8 long limit middle with strip metal conductor 9 is 0.2mm, being respectively provided on two sides with of rectangular metal conductor 8
Symmetrical and radius is the via of 0.5mm, and the back side of FR4 dielectric-slab 7 is provided with symmetrical semi-arched metallic conductor 10, and half
The distance on the horizontal bottom of arch metallic conductor 10 and FR4 dielectric-slab 7 base is 3mm, this horizontal bottom a length of
2mm, the vertical outer side edges of semi-arched metallic conductor 10 overlaps with the side of FR4 dielectric-slab 7, this vertical outer side edges a length of
11mm, a length of 14mm on base in the level of semi-arched metallic conductor 10, the vertical inner side edge of semi-arched metallic conductor 10
A length of 3.2mm, the bottom of vertical inner side edge and the medial extremity of horizontal bottom pass through arc transition, semi-arched metallic conductor 10
It is provided with relative with rectangular metal conductor 8 via and that radius is consistent via.
Described absorbing material 5 is all in close contact with metallic enclosure 3 and insulation medium board 2, the material of this absorbing material 5
For multilayer polyurethane foam, relative dielectric constant is 2.2, and electrical conductivity is 0.125S/m.
Described coaxial connector 6 is installed on the imbalance of the back side of insulation medium board 2, its one end and impedance transformer 4
Input is electrical connected, and the other end is connected with transmitter or the receiver of ULTRA-WIDEBAND RADAR.
Fig. 2 and 3 is the front and back structural representation of impedance transformer, as Figure 2-3, this impedance transformer
The front and back of FR4 dielectric-slab 7 is all printed with metallic conductor, the dielectric constant of FR4 dielectric-slab 7 by printed-board technology
Being 4.4, thickness is 1.5mm, a length of 38mm, and width is 20mm.Plane dipole antenna is carried out according to port Impedance 100 Ω
Coupling, in order to reduce the volume of antenna, it is simple to Miniaturized portable system integrated, according to the height of metallic enclosure 3 and micro-
Band and the impedance computation formula of parallel wire, design one according to exponential fade method and have compact 1:2 impedance transformation function
And imbalance is to the microstrip feed structures of balanced output characteristic, its design parameter is as follows:l p =18mm,w p =3.8mm,l m =
10mm,w m =3mm,l g=14mm,w g =11mm,d m =6.6mm,w e =3.2mm,s p =0.2mm,d g =3mm,r=0.5mm andh g =2mm。
As shown in Figure 4, for the voltage standing wave ratio curve chart of ultra wide band dipolar antenna.In figure, abscissa represents that frequency becomes
Amount, unit is GHz, and vertical coordinate represents amplitude variations.As seen from the figure, in 0.7-4GHz frequency range, voltage standing wave(VSW) coefficient is equal
Less than 2, it is possible to meet the resolution requirement of ultra-broadband wall-through radar system well.
As it is shown in figure 5, be the gain curve figure of ultra wide band dipolar antenna.In figure, abscissa represents frequency variable, unit
For GHz, vertical coordinate represents gain, and unit is dB.As seen from the figure, the change in gain of passband internal antenna is relatively flat, substantially ties up
Hold at about 0dB, the requirement of ultra-broadband wall-through radar range can be met.
As shown in Figure 6, for radiated wave before and after 0.5m position receives on ultra wide band dipolar antenna system axis direction
Shape figure.In figure, abscissa express time variable, unit is ns, and vertical coordinate represents amplitude variations, and unit is V.As seen from the figure, sky
The radiation waveform of line is relatively cleaner, follows the vibration below of primary radiation ripple closely smaller, and instantaneous radiation waveform ratio front and back is
12.5dB, antenna has stronger directional radiation properties and avoids the ability of extraneous small-signal interference, meeting ultra-broadband wall-through
The detection accuracy of radar antenna and resolution requirement.
In sum, the ultra wide band dipolar antenna that this utility model provides has that work strip is roomy, Time Domain Radiation Characteristics
The features such as good, antenna volume is little, compact conformation and contour smoothing, feeding classification is simple, easily processing and safeguarding, it is possible to meet super
The engineering demand of miniaturization portable radar system.
Of the present utility model ultimate principle, principal character and advantage are more than shown and described, new without departing from this practicality
On the premise of type spirit and scope, this utility model also has various changes and modifications, and these changes and improvements both fall within requirement and protect
The scope of the present utility model protected.
Claims (7)
1. ultra wide band dipolar antenna, it is characterised in that include that metal radiation arm, insulation medium board, metallic enclosure, impedance become
Parallel operation, absorbing material and coaxial connector, wherein metal radiation arm symmetry is printed on the front of insulation medium board, this metal radiation
The transverse cross-sectional shape of arm can be represented by following curve:, 0≤t≤0.5, x is metal radiation
The long axis direction of arm, y is the short-axis direction of metal radiation arm, is preset with interval between metal radiation arm, two of adjacent partition
Being respectively equipped with input port on metal radiation arm as respective feed end, impedance transformer is for having 1:2 impedance transformation function
And the uneven microstrip feed structures to balanced output characteristic, the balance output end of this impedance transformer respectively with two metals
The feed end of radiation arm is electrically connected with, and for impedance matching, the input of impedance transformer is connected with one end of coaxial connector,
The other end of this coaxial connector is connected with transmitter or the receiver of ultra-broadband wall-through radar, and metallic enclosure is positioned at insulation and is situated between
The surface of scutum, the inside of this metallic enclosure is filled with absorbing material.
Ultra wide band dipolar antenna the most according to claim 1, it is characterised in that: preset between described metal radiation arm
Spacing distance be 1.5-2.5mm.
Ultra wide band dipolar antenna the most according to claim 1, it is characterised in that: described insulation medium board is that one side covers
The epoxy resin fiberglass cloth dielectric-slab of copper, its thickness is 1mm, and dielectric constant is 4.4, and this insulation medium board is fixed on metal
At the bottom end opening of shielding cavity.
Ultra wide band dipolar antenna the most according to claim 1, it is characterised in that: described metallic enclosure is that bottom surface is opened
Mouthful rectangular cavities, its height be the 1/8 of free space wavelength corresponding to center of antenna frequency, ties according to simulation optimization design
Really, the size of described metallic enclosure is: length 100mm, width 60mm, highly 20mm.
Ultra wide band dipolar antenna the most according to claim 1, it is characterised in that: described impedance transformer is for having 1:
2 impedance transformation functions and the microstrip feed structures of uneven 50 Ω to 100 Ω balanced output characteristic, this impedance transformer includes
FR4 dielectric-slab and be printed in the metallic conductor of FR4 dielectric-slab front and back by printed-board technology, FR4 dielectric-slab
Dielectric constant is 4.4, and thickness is 1.5mm, a length of 38mm, and width is that the front of 20mm, FR4 dielectric-slab is provided with the most parallel
With the strip metal conductor that the rectangular metal conductor of via and width two ends, centre are narrow, the length of strip metal conductor is situated between with FR4
The length of scutum is consistent, and the length and width on narrow limit, its two ends is respectively 10mm and 3mm, and the length and width of middle broadside is respectively
For 18mm and 3.8mm, narrow limit, two ends is connected to the middle part of middle broadside, narrow limit, two ends and the distance on FR4 dielectric-slab base
For 6.6mm, the length of broadside is consistent and this rectangular metal conductor is arranged at in the middle of strip metal conductor for rectangular metal conductor
The surface of broadside in the middle of strip metal conductor, the distance on rectangular metal conductor long limit middle with strip metal conductor is 0.2mm,
Rectangular metal conductor be respectively provided on two sides with symmetry and radius be the via of 0.5mm, the back side of FR4 dielectric-slab is provided with left and right
Symmetrical semi-arched metallic conductor, the horizontal bottom of semi-arched metallic conductor is 3mm with the distance on FR4 dielectric-slab base, should
The a length of 2mm of horizontal bottom, the vertical outer side edges of semi-arched metallic conductor overlaps with the side of FR4 dielectric-slab, and this is vertical
The a length of 11mm of outer side edges, a length of 14mm on base in the level of semi-arched metallic conductor, erecting of semi-arched metallic conductor
The a length of 3.2mm of straight inner side edge, the bottom of vertical inner side edge and the medial extremity of horizontal bottom are by arc transition, semi-arched
Metallic conductor is provided with relative with rectangular metal conductor via and that radius is consistent via.
Ultra wide band dipolar antenna the most according to claim 1, it is characterised in that: described absorbing material and metallic shield
Chamber and insulation medium board are all in close contact, and the material of this absorbing material is multilayer polyurethane foam, and relative dielectric constant is 2.2,
Electrical conductivity is 0.125S/m.
Ultra wide band dipolar antenna the most according to claim 1, it is characterised in that: described coaxial connector is installed on absolutely
The back side of edge dielectric-slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620433106.5U CN205646145U (en) | 2016-05-16 | 2016-05-16 | Ultra wide band dipolar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620433106.5U CN205646145U (en) | 2016-05-16 | 2016-05-16 | Ultra wide band dipolar antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205646145U true CN205646145U (en) | 2016-10-12 |
Family
ID=57059262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620433106.5U Withdrawn - After Issue CN205646145U (en) | 2016-05-16 | 2016-05-16 | Ultra wide band dipolar antenna |
Country Status (1)
| Country | Link |
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| CN (1) | CN205646145U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826673A (en) * | 2016-05-16 | 2016-08-03 | 河南师范大学 | Ultra-wideband teardrop-shaped dipole antenna |
| CN106535606A (en) * | 2016-12-30 | 2017-03-22 | 深圳天珑无线科技有限公司 | Radio frequency shielding device |
| CN107942325A (en) * | 2017-12-28 | 2018-04-20 | 江苏微远芯微系统技术有限公司 | A kind of anti-intrusion device based on millimetre-wave radar |
-
2016
- 2016-05-16 CN CN201620433106.5U patent/CN205646145U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826673A (en) * | 2016-05-16 | 2016-08-03 | 河南师范大学 | Ultra-wideband teardrop-shaped dipole antenna |
| CN105826673B (en) * | 2016-05-16 | 2018-05-04 | 河南师范大学 | Ultra wide band tear drop shape dipole antenna |
| CN106535606A (en) * | 2016-12-30 | 2017-03-22 | 深圳天珑无线科技有限公司 | Radio frequency shielding device |
| CN106535606B (en) * | 2016-12-30 | 2024-05-10 | 深圳天珑无线科技有限公司 | Radio frequency shielding device |
| CN107942325A (en) * | 2017-12-28 | 2018-04-20 | 江苏微远芯微系统技术有限公司 | A kind of anti-intrusion device based on millimetre-wave radar |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161012 Effective date of abandoning: 20180504 |
|
| AV01 | Patent right actively abandoned |