CN105826673A - Ultra-wideband teardrop-shaped dipole antenna - Google Patents
Ultra-wideband teardrop-shaped dipole antenna Download PDFInfo
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- CN105826673A CN105826673A CN201610315564.3A CN201610315564A CN105826673A CN 105826673 A CN105826673 A CN 105826673A CN 201610315564 A CN201610315564 A CN 201610315564A CN 105826673 A CN105826673 A CN 105826673A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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Abstract
The invention discloses an ultra-wideband teardrop-shaped dipole antenna, wherein metal radiation arms are symmetrically printed on the front face of an insulating medium plate; an interval is preset between the metal radiation arms; the two metal radiation arms adjacent to the interval are equipped with input ports respectively, and the input ports are taken as separate feed ends; a balance output end of an impedance converter is electrically connected to the feed ends of the two metal radiation arms respectively; an input end of the impedance converter is connected to one end of a coaxial connector; the other end of the coaxial connector is connected to a sender or a receiver of an ultra-wideband through-way radar; a metal shielding chamber is located right above the insulating medium plate; and the metal shielding chamber is filled with a wave-absorbing material. The antenna disclosed by the invention is characterized by a large working bandwidth, good time-domain radiation features, a small antenna volume, a compact structure and a smooth outline, etc. The antenna has the advantages that the feeding mode is simple; processing and maintenance are easy; and engineering demands of an ultra-wideband portable miniaturized radar system can be satisfied.
Description
Technical field
The invention belongs to ultra-broadband wall-through Radar Antenna System field, be specifically related to a kind of ultra broadband tear drop shape dipole antenna.
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 by the pulse that transmitting a kind of persistent period is extremely short and personnel in building and internal structure carries out non-invasive imaging and follows the tracks of detection, and has advantages such as not damaging detected body of wall, high detection resolution and high workload efficiency.In recent years, along with Urbanization Construction constantly advances, China's urban infrastructure construction, urban house construction, industry have also been obtained fast development with energy base construction and Transport Facility Construction, utilize ULTRA-WIDEBAND RADAR Detection Techniques that hidden dangers in project carries out investigation and start to obtain extensively application.
Antenna is a vital ingredient in ultra-broadband wall-through radar system, plays to emission radar signal and the dual function of reception detected target echo-signal, and the quality of its performance directly affects detection accuracy and the detection range of whole radar system.It is limited to radar signal in metope scattering interference and the decay in body of wall medium and the uncertainty of detected target RCS, in view of the portable miniaturized demand in practical engineering application, therefore it is required that antenna has good radiation characteristic, ultra-wide band characteristic, lightweight and low profile characteristic.
It is currently used for butterfly antenna, electromagnetic horn and Vivaldi antenna that the antenna of ultra-broadband wall-through radar mainly has resistance capacitance to load, the butterfly antenna the most especially loaded based on impedance.Although the butterfly antenna that impedance loads has preferable medium couples characteristic and time-domain radiation waveform, but radiation efficiency is poor, affects radar actual detection distance；Electromagnetic horn and Vivaldi antenna near-earth coupling are poor, and have bigger laterally and longitudinally size, are unfavorable for that the miniaturization of system, with integrated, affects Through-Wall Radar System application in Practical Project.Therefore, develop one and both there is small size, there is again the ultra-wideband antenna of relatively good gain, Miniaturized portable ultra-broadband wall-through radar system is had great significance.
Summary of the invention
Present invention solves the technical problem that there is provided a kind of ground, body of wall etc. of can being applied to shelters the ultra broadband tear drop shape dipole antenna of lower target acquisition.
The present invention solves that above-mentioned technical problem adopts the following technical scheme that, ultra broadband tear drop shape dipole antenna, it is characterized in that including 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 represented by following curve:, 0≤t≤0.5, x is the long axis direction of metal radiation arm, y is the short-axis direction of metal radiation arm, it is preset with interval between metal radiation arm, it is respectively equipped with input port as respective feed end on two metal radiation arms of adjacent partition, impedance transformer is to have 1:2 impedance transformation function and the uneven microstrip feed structures to balanced output characteristic, this impedance transformer balance output end is electrically connected with the feed end of two metal radiation arms respectively, for impedance matching, impedance transformer input 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, metallic enclosure is positioned at the surface of insulation medium board, the inside of this metallic enclosure 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 its thickness 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 the 1/8 of free space wavelength corresponding to center of antenna frequency, 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 to have 1:2 impedance transformation function and the microstrip feed structures of uneven 50 Ω to 100 Ω balanced output characteristic.nullThis impedance transformer connected back-to-back is included FR4 dielectric-slab and is printed in the metallic conductor of FR4 dielectric-slab front and back by printed-board technology，The dielectric constant of FR4 dielectric-slab is 4.4，Thickness is 1.5mm，A length of 38mm，Width is 20mm，The front of FR4 dielectric-slab is provided with the narrow strip metal conductor of the most parallel rectangular metal conductor with via and width two ends, centre，The length of strip metal conductor is consistent with the length of FR4 dielectric-slab，The length and width on narrow limit, its two ends is respectively 10mm and 3mm，The length and width of middle broadside is respectively 18mm and 3.8mm，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，Rectangular metal conductor is consistent with the length of broadside in the middle of strip metal conductor and this rectangular metal conductor is arranged at 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 symmetrical semi-arched metallic conductor，The horizontal bottom of semi-arched metallic conductor is 3mm with the distance on FR4 dielectric-slab base，The a length of 2mm of this horizontal bottom，The vertical outer side edges of semi-arched metallic conductor overlaps with the side of FR4 dielectric-slab，The a length of 11mm of this vertical outer side edges，The a length of 14mm on base in the level of semi-arched metallic conductor，The a length of 3.2mm of the vertical inner side edge of semi-arched metallic conductor，Vertically the bottom of inner side edge and the medial extremity of horizontal bottom pass through arc transition，Semi-arched metallic conductor is provided with relative with rectangular metal conductor via and that radius is consistent via.
Further preferably, described absorbing material is all in close contact with metallic enclosure and insulation medium board, and the material of this absorbing 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.
The features such as the present invention has that work strip is roomy, Time Domain Radiation Characteristics good, antenna volume is little, compact conformation and contour smoothing, this ultra broadband tear drop shape dipole antenna feeding classification is simple, it is prone to processing and safeguards, it is possible to meeting the engineering demand of the portable miniaturized radar system of ultra broadband.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the impedance transformer Facad structure schematic diagram connected back-to-back in the present invention；
Fig. 3 is the impedance transformer structure schematic diagram connected back-to-back in the present invention；
Fig. 4 is the voltage standing wave ratio curve of the present invention；
Fig. 5 is the gain curve of the present invention；
Fig. 6 is radiation waveform curve before and after 0.5m position receives on present 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
The particular content of the present invention is described in detail in conjunction with accompanying drawing.Fig. 1 is the structural representation of ultra broadband tear drop shape dipole antenna, as shown in Figure 1, this ultra broadband tear drop shape dipole antenna includes metal radiation arm 1, insulation medium board 2, metallic enclosure 3, impedance transformer 4, absorbing material 5 and coaxial connector 6, wherein metal radiation arm 1 symmetry is printed on the front of insulation medium board 2, and the transverse cross-sectional shape of this metal radiation arm 1 can be represented by following curve:, 0≤t≤0.5, x is the long axis direction of metal radiation arm 1, y is the short-axis direction of metal radiation arm 1, it is preset with interval between metal radiation arm 1, it is respectively equipped with input port as respective feed end on two metal radiation arms 1 of adjacent partition, impedance transformer 4 is to have 1:2 impedance transformation function and the uneven microstrip feed structures to balanced output characteristic, the balance output end of this impedance transformer 4 is electrically connected with the feed end of two metal radiation arms 1 respectively, for impedance matching, the input of impedance transformer 4 is connected with one end of coaxial connector 6, the other end of this coaxial connector 6 is connected with transmitter or the receiver of ultra-broadband wall-through radar, metallic enclosure 3 is 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, it is respectively equipped with input port on two metal radiation arms 1 of adjacent partition as respective feed end, according to antenna technology index requests such as input impedances, the interval between two metal radiation arms 1 can be adjusted.
Described insulation medium board 2 covers the epoxy resin fiberglass cloth dielectric-slab of copper for one side, and its thickness is 1mm, and dielectric 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 1/8 of free space wavelength corresponding to center of antenna frequency, and 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 to have 1:2 impedance transformation function and the microstrip feed structures of uneven 50 Ω to 100 Ω balanced output characteristic.nullThis impedance transformer connected back-to-back is included FR4 dielectric-slab 7 and is printed in the metallic conductor of FR4 dielectric-slab 7 front and back by printed-board technology，The dielectric constant of FR4 dielectric-slab 7 is 4.4，Thickness is 1.5mm，A length of 38mm，Width is 20mm，The front of FR4 dielectric-slab 7 is provided with the strip metal conductor 9 that the wide two ends of the most parallel rectangular metal conductor 8 with via and centre are narrow，The length of strip metal conductor 9 is consistent with the length of FR4 dielectric-slab 7，The length and width on narrow limit, its two ends is respectively 10mm and 3mm，The length and width of middle broadside is respectively 18mm and 3.8mm，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 7 base，The length of rectangular metal conductor 8 broadside middle with strip metal conductor 9 is consistent 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，Rectangular metal conductor 8 be respectively provided on two sides with symmetry and radius be the via of 0.5mm，The back side of FR4 dielectric-slab 7 is provided with symmetrical semi-arched metallic conductor 10，The horizontal bottom of semi-arched metallic conductor 10 is 3mm with the distance on FR4 dielectric-slab 7 base，The a length of 2mm of this horizontal bottom，The vertical outer side edges of semi-arched metallic conductor 10 overlaps with the side of FR4 dielectric-slab 7，The a length of 11mm of this vertical outer side edges，The a length of 14mm on base in the level of semi-arched metallic conductor 10，The a length of 3.2mm of the vertical inner side edge of semi-arched metallic conductor 10，Vertically the bottom of inner side edge and the medial extremity of horizontal bottom pass through arc transition，Semi-arched metallic conductor 10 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, and the material of this absorbing material 5 is multilayer polyurethane foam, and relative dielectric constant is 2.2, and electrical conductivity is 0.125S/m.
Described coaxial connector 6 is installed on the back side of insulation medium board 2, and its one end is electrical connected with the unbalanced voltage condition end of impedance transformer 4, 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 the impedance transformer connected back-to-back, as Figure 2-3, the front and back of the FR4 dielectric-slab 7 of this impedance transformer connected back-to-back is all printed with metallic conductor by printed-board technology, the dielectric constant of FR4 dielectric-slab 7 is 4.4, thickness is 1.5mm, a length of 38mm, width is 20mm.Plane tear drop shape dipole antenna is mated according to port Impedance 100 Ω, in order to reduce the volume of antenna, it is easy to the integrated of Miniaturized portable system, height and the impedance computation formula of micro-strip and parallel wire according to metallic enclosure 3, designing one according to exponential fade method and have compact 1:2 impedance transformation function and the uneven microstrip feed structures to balanced output characteristic, its design parameter is as follows: lp=18mm, wp=3.8mm, lm=10mm, wm=3mm, lg=14mm, wg=11mm, dm=6.6mm, we=3.2mm, sp=0.2mm, dg=3mm, r=0.5mm and hg=2mm。
As shown in Figure 4, for the voltage standing wave ratio curve chart of ultra broadband tear drop shape dipole antenna.In figure, abscissa represents frequency variable, and 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 respectively 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 broadband tear drop shape dipole antenna.In figure, abscissa represents frequency variable, and unit is GHz, and vertical coordinate represents gain, and unit is dB.As seen from the figure, the change in gain of passband internal antenna is relatively flat, maintains essentially in about 0dB, can meet the requirement of ultra-broadband wall-through radar range.
As shown in Figure 6, for radiation waveform figure before and after 0.5m position receives on ultra broadband tear drop shape dipole antenna system axis direction.In figure, abscissa express time variable, unit is ns, and vertical coordinate represents amplitude variations, and unit is V.As seen from the figure, the radiation waveform of antenna is cleaner, follow the vibration below of primary radiation ripple closely smaller, before and after instantaneous, radiation waveform ratio is 12.5dB, antenna has stronger directional radiation properties and avoids the ability of extraneous small-signal interference, meets detection accuracy and the resolution requirement of ultra-broadband wall-through radar antenna.
In sum, the features such as the ultra broadband tear drop shape dipole antenna that the present invention provides has that work strip is roomy, Time Domain Radiation Characteristics good, antenna volume is little, compact conformation and contour smoothing, feeding classification is simple, easily processing and maintenance, it is possible to meet the engineering demand of ultra broadband Miniaturized portable radar system.
The ultimate principle of the present invention, principal character and advantage have more than been shown and described, and without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements both fall within the scope of claimed invention.
Claims (7)
1. ultra broadband tear drop shape dipole antenna, it is characterized in that including 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 represented by following curve:, 0≤t≤0.5, x is the long axis direction of metal radiation arm, y is the short-axis direction of metal radiation arm, it is preset with interval between metal radiation arm, it is respectively equipped with input port as respective feed end on two metal radiation arms of adjacent partition, impedance transformer is to have 1:2 impedance transformation function and the uneven microstrip feed structures to balanced output characteristic, the balance output end of this impedance transformer is electrically connected with the feed end of two metal radiation arms respectively, 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, metallic enclosure is positioned at the surface of insulation medium board, the inside of this metallic enclosure is filled with absorbing material.
Ultra broadband tear drop shape dipole antenna the most according to claim 1, it is characterised in that: the spacing distance preset between described metal radiation arm is 1.5-2.5mm.
Ultra broadband tear drop shape dipole antenna the most according to claim 1, it is characterized in that: described insulation medium board is the epoxy resin fiberglass cloth dielectric-slab that one side covers copper, its thickness is 1mm, and dielectric constant is 4.4, and this insulation medium board is fixed at the bottom end opening of metallic enclosure.
Ultra broadband tear drop shape dipole antenna the most according to claim 1, it is characterized in that: described metallic enclosure is the rectangular cavities of bottom surface opening, its height is the 1/8 of free space wavelength corresponding to center of antenna frequency, according to simulation optimization design result, the size of described metallic enclosure is: length 100mm, width 60mm, highly 20mm.
nullUltra broadband tear drop shape dipole antenna the most according to claim 1，It is characterized in that: described impedance transformer is to have 1:2 impedance transformation function and the microstrip feed structures of uneven 50 Ω to 100 Ω balanced output characteristic，This impedance transformer connected back-to-back is included FR4 dielectric-slab and is printed in the metallic conductor of FR4 dielectric-slab front and back by printed-board technology，The dielectric constant of FR4 dielectric-slab is 4.4，Thickness is 1.5mm，A length of 38mm，Width is 20mm，The front of FR4 dielectric-slab is provided with the narrow strip metal conductor of the most parallel rectangular metal conductor with via and width two ends, centre，The length of strip metal conductor is consistent with the length of FR4 dielectric-slab，The length and width on narrow limit, its two ends is respectively 10mm and 3mm，The length and width of middle broadside is respectively 18mm and 3.8mm，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，Rectangular metal conductor is consistent with the length of broadside in the middle of strip metal conductor and this rectangular metal conductor is arranged at 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 symmetrical semi-arched metallic conductor，The horizontal bottom of semi-arched metallic conductor is 3mm with the distance on FR4 dielectric-slab base，The a length of 2mm of this horizontal bottom，The vertical outer side edges of semi-arched metallic conductor overlaps with the side of FR4 dielectric-slab，The a length of 11mm of this vertical outer side edges，The a length of 14mm on base in the level of semi-arched metallic conductor，The a length of 3.2mm of the vertical inner side edge of semi-arched metallic conductor，Vertically the bottom of inner side edge and the medial extremity of horizontal bottom pass through arc transition，Semi-arched metallic conductor is provided with relative with rectangular metal conductor via and that radius is consistent via.
Ultra broadband tear drop shape dipole antenna the most according to claim 1, it is characterized in that: described absorbing material is all in close contact with metallic enclosure and insulation medium board, the material of this absorbing material is multilayer polyurethane foam, and relative dielectric constant is 2.2, and electrical conductivity is 0.125S/m.
Ultra broadband tear drop shape dipole antenna the most according to claim 1, it is characterised in that: described coaxial connector is installed on the back side of insulation medium board.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610315564.3A CN105826673B (en) | 2016-05-16 | 2016-05-16 | Ultra wide band tear drop shape dipole antenna |
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| CN201610315564.3A CN105826673B (en) | 2016-05-16 | 2016-05-16 | Ultra wide band tear drop shape dipole antenna |
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| CN105826673A true CN105826673A (en) | 2016-08-03 |
| CN105826673B CN105826673B (en) | 2018-05-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329076A (en) * | 2016-09-26 | 2017-01-11 | 河南师范大学 | Wide-band semicircular slot loading semi-elliptical antenna |
| CN106532260A (en) * | 2016-09-26 | 2017-03-22 | 河南师范大学 | Ultra-wideband antenna for life detection radar |
| CN112578375A (en) * | 2020-12-13 | 2021-03-30 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Handheld composite detector probe and preparation method thereof |
| WO2024097188A1 (en) * | 2022-10-31 | 2024-05-10 | John Mezzalingua Associates, LLC. | Ultra-flat 2x2 mimo broadband antenna |
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| CN203910951U (en) * | 2014-06-03 | 2014-10-29 | 中国科学院电子学研究所 | Radar antenna |
| CN205646145U (en) * | 2016-05-16 | 2016-10-12 | 河南师范大学 | Ultra wide band dipolar antenna |
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| JP2009212727A (en) * | 2008-03-03 | 2009-09-17 | Anritsu Corp | Radar antenna |
| CN203910951U (en) * | 2014-06-03 | 2014-10-29 | 中国科学院电子学研究所 | Radar antenna |
| CN205646145U (en) * | 2016-05-16 | 2016-10-12 | 河南师范大学 | Ultra wide band dipolar antenna |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329076A (en) * | 2016-09-26 | 2017-01-11 | 河南师范大学 | Wide-band semicircular slot loading semi-elliptical antenna |
| CN106532260A (en) * | 2016-09-26 | 2017-03-22 | 河南师范大学 | Ultra-wideband antenna for life detection radar |
| CN112578375A (en) * | 2020-12-13 | 2021-03-30 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Handheld composite detector probe and preparation method thereof |
| CN112578375B (en) * | 2020-12-13 | 2023-12-15 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Handheld composite detector probe and preparation method thereof |
| WO2024097188A1 (en) * | 2022-10-31 | 2024-05-10 | John Mezzalingua Associates, LLC. | Ultra-flat 2x2 mimo broadband antenna |
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