CN105552533B - Butterfly deforms radar antenna - Google Patents
Butterfly deforms radar antenna Download PDFInfo
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- CN105552533B CN105552533B CN201610068088.XA CN201610068088A CN105552533B CN 105552533 B CN105552533 B CN 105552533B CN 201610068088 A CN201610068088 A CN 201610068088A CN 105552533 B CN105552533 B CN 105552533B
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- 230000005855 radiation Effects 0.000 claims abstract description 60
- 230000007704 transition Effects 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 abstract 2
- 241000255777 Lepidoptera Species 0.000 abstract 1
- 238000005192 partition Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 9
- 230000010355 oscillation Effects 0.000 description 4
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000007639 printing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Landscapes
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of butterflies to deform radar antenna, the front that radiation arm is symmetrically printed on insulation medium board constitutes plane dipole antenna, the top of the radiation arm is triangular structure, lower part is rectangular configuration, the junction of triangular structure and rectangular configuration is in arc transition, it is spaced between two radiation arms, feed end of the input port as antenna is respectively equipped on two radiation arms of adjacent partition, the rectangular configuration bottom edge two sides of two radiation arms are connected separately with loading resistor, the other end and rectangular shield chamber of the loading resistor are connected to form load circuit, four sides of rectangular shield chamber and the edge of insulation medium board are fixed by nut.The present invention realizes broadband properties and good Time Domain Radiation Characteristics by shortening radiation arm lateral dimension, loading resistor and metal rectangular shielding cavity, and antenna volume is smaller, is easy to the miniaturization of radar, meets the installation requirement of vehicle-mounted ultra wideband radar system.
Description
Technical Field
The invention belongs to the technical field of broadband imaging radar antennas, and particularly relates to a butterfly-shaped deformation radar antenna.
Background
In recent years, with the continuous development of old urban area transformation, urban road and underground pipe network infrastructure and other infrastructure construction, the ultra-wideband radar detection technology is beginning to be widely applied in the industries of geophysical research, municipal engineering, road disease detection and the like. The ultra-wideband radar detection technology has the advantages of high resolution, strong penetration capacity, low interception rate, strong anti-interference performance and the like, can realize non-contact detection of non-uniform medium structures such as urban road underground cavities, metal pipe networks, drainage systems and the like, and has the characteristics of no damage to detected media and the like. The characteristics enable the ultra-wideband radar to be more and more popular in the aspects of municipal construction and daily detection and supervision of urban road potential safety hazards.
An ultra-wideband radar system is generally composed of an antenna, a transmitter and a receiver. As a key component for transmitting and receiving electromagnetic waves, the design of the ultra-wideband antenna is an important link, and the performance of the antenna directly influences the imaging and positioning quality of the radar. Due to the influence of the surface material properties, scattering interference of different media, uncertainty of a target position, weaker target echo from the deeper ground, and the like, the antenna is required to have the characteristics of time domain fidelity, high gain, super bandwidth, good directionality, and the like, and is also required to be easy to manufacture and small in size so as to meet the practical engineering application.
At present, widely used broadband antennas in ultra-wideband radars comprise bow-tie antennas loaded by resistance and capacitance, transverse electromagnetic wave horn antennas, Vivaldi antennas and the like, ports of loaded bow-tie antennas are well matched, tail oscillation of radiation waveforms is small, antenna radiation efficiency is poor and is generally below 30%, and actual detection distance of the radars can be influenced due to the fact that amplitude of transmitted signals generated by a transmitter is limited. The transverse electromagnetic wave horn antenna and the Vivaldi antenna have good directivity and high gain, but have poor near-ground coupling characteristics, and the transverse size and the longitudinal size of the antennas are large, so that the transverse electromagnetic wave horn antenna and the Vivaldi antenna are not beneficial to the miniaturization of a system and the vehicle-mounted requirement.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the butterfly-shaped deformation radar antenna capable of meeting the requirements of the vehicle-mounted ultra-wideband radar on the urban road.
The invention adopts the following technical scheme to solve the technical problems, and the butterfly-shaped deformation radar antenna is characterized by comprising a rectangular shielding cavity, an insulating dielectric plate, two radiation arms, four loading resistors and input ports, wherein the two radiation arms are symmetrically printed on the front surface of the insulating dielectric plate to form a planar dipole antenna, the upper parts of the radiation arms are of a triangular structure, the lower parts of the radiation arms are of a rectangular structure, the joint of the triangular structure and the rectangular structure is in arc transition, the opening angle of the top of the triangular structure is not less than 90 degrees, a space is reserved between the two radiation arms, the two adjacent spaced radiation arms are respectively provided with the input ports as the feeding ends of the antenna, the input ports are connected with an external excitation signal source, signals are transmitted to the two radiation arms through the input ports and radiate to the space through the radiation arms, the two sides of the bottom edges of the rectangular structures of the two radiation arms, the other end of the loading resistor is connected with a rectangular shielding cavity to form a loading loop, the rectangular shielding cavity is a rectangular cavity with an opening at one side, and four sides of the rectangular shielding cavity are fixed with the edge of the insulating medium plate through nuts.
More preferably, the radiation arm is made of brass, gold, aluminum or iron.
Preferably, the insulating medium plate is made of an epoxy resin glass fiber cloth laminated plate, and the thickness of the insulating medium plate is 1-2 mm.
Preferably, the rectangular shielding cavity is made of aluminum, has a thickness of 1mm, and has a height of 0.315 times of a free space wavelength corresponding to the central frequency of the antenna.
Further preferably, the opening angle of the top of the triangular structure of the radiation arm is between 90 and 100 degrees.
The butterfly deformation radar antenna is integrated in a vehicle-mounted urban road underground disease body ultra wide band detection radar system, the antenna realizes broadband characteristics and good time domain radiation characteristics by shortening the transverse size of a radiation arm, loading resistance and a metal rectangular shielding cavity, and the antenna is small in size, easy to miniaturize the radar and capable of meeting the installation requirements of the vehicle-mounted ultra wide band radar system.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a voltage standing wave ratio curve of the present invention;
fig. 3 is a time domain radiation waveform plot at a 2m position of the present invention.
In the figure: 11. the antenna comprises a first radiating arm, 12, a second radiating arm, 21, a first loading resistor, 22, a second loading resistor, 23, a third loading resistor, 24, a fourth loading resistor, 3, a rectangular shielding cavity, 4, an insulating dielectric plate, 5 and an input port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that in the drawings or description, the same drawing reference numerals are used for similar or identical parts. Implementations not depicted or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. Directional phrases used in the embodiments, such as "upper," "lower," "front," "rear," "left," "right," and the like, refer only to the orientation of the figure. Accordingly, the directional terminology used is intended to be in the nature of words of description rather than of limitation.
Fig. 1 is a schematic structural diagram of a bowtie radar antenna according to the present invention, and as shown in fig. 1, the bowtie radar antenna includes an insulating dielectric plate 4, a first radiation arm 11, a second radiation arm 12, an input port 5, a first loading resistor 21, a second loading resistor 22, a third loading resistor 23, a fourth loading resistor 24, and a rectangular shielding cavity 3, where:
the first radiation arm 11 and the second radiation arm 12 are made of metal, preferably metal such as brass, gold, aluminum, and iron. The two radiation arms are symmetrically printed on the front surface of the insulating dielectric plate 4 by a circuit board printing technology to form a planar dipole antenna. The lower parts of the first radiation arm 11 and the second radiation arm 12 are in a rectangular structure, the upper parts of the first radiation arm and the second radiation arm are in a triangular structure, and the connection part of the triangular structure and the rectangular structure is in arc transition so as to reduce the transverse size of the antenna and avoid the generation of current discontinuous points. The widths of the two radiation arms can be adjusted according to the antenna size requirement so as to meet the overall performance requirement of the system and the length of the radiation armslOpening angleθSatisfies the following conditions:
；，
wherein,λ l the low frequency cut-off frequency for the antenna corresponds to the free space wavelength,in order to obtain the opening angle of the radiation arm,Z c is the characteristic impedance of the antenna.
The first radiating arm 11 and the second radiating arm 12 form a planar dipole antenna, a space is reserved between the two radiating arms, the two adjacent spaced radiating arms are respectively provided with an input port 5 serving as a feed end of the antenna, and the two radiating arms are separated by a first preset distance of 2 mm. The distance between the two radiating arms can be adjusted by those skilled in the art according to the antenna specification requirements such as input impedance.
The resistance values of the first loading resistor 21, the second loading resistor 22, the third loading resistor 23 and the fourth loading resistor 24 are all about 220 Ω, and the resistance values and the number of the resistors can be adjusted according to actual needs. One end of each of the first loading resistor 21 and the second loading resistor 22 is welded to two sides of the bottom edge of the first radiating arm 11, and the other end is connected to the side wall of the rectangular shielding cavity 3; the third loading resistor 23 and the fourth loading resistor 24 are connected with the bottom edge of the second radiation arm 12 and the side wall of the rectangular shielding cavity 3 to form a loading loop, so that the cutoff reflected current on the radiation arm can be effectively reduced, and the pulse tailing is further inhibited.
The insulating dielectric plate 4 is made of epoxy resin glass fiber cloth laminated board, the thickness of the insulating dielectric plate is about 1-2mm, and the length and the width of the insulating dielectric plate are determined by the size of the antenna body.
The rectangular shielding cavity 3 is made of metal, preferably aluminum. The shielding cavity is a rectangular cavity with an opening at one end, the opening surface is used for installing the insulating dielectric plate 4 and is parallel to the bottom surface of the metal shielding cavity, and the edge of the insulating dielectric plate 4 is fixed with the opening surface of the rectangular shielding cavity 3 through a nut. The thickness of the rectangular shielding cavity 3 is about 1mm, the height H of the rectangular shielding cavity is about 0.315 times of the free space wavelength corresponding to the central frequency of the antenna, and technicians of the length and the width can properly adjust the rectangular shielding cavity according to the size of the insulating dielectric plate so as to ensure that the antenna has light weight, good directional radiation capability and strong capability of resisting various external complex electromagnetic interferences.
When the butterfly-shaped deformation radar antenna works, the input port 5 is connected with an external excitation signal source, signals are transmitted to the first radiation arm 11 and the second radiation arm 12 through the input port and are radiated to a space through the two radiation arms, and the function of urban road underground disease body detection imaging is achieved.
When the metal radiation arm 11 and the metal radiation arm 12 are manufactured, firstly, the opening angle of the butterfly antenna arm is a large opening angle which is not less than 90 degrees, the value of the opening angle is between 90 degrees and 100 degrees, the triangular structure is kept unchanged within a distance close to the input port 5, and the top angles at two sides of the triangular structure are cut off, so that the transverse size of the antenna is effectively reduced. The edges and corners are subjected to circular arc treatment, so that the generation of current discontinuous points is avoided. After treatment, the radiation arm forms a butterfly-shaped deformation antenna with a rectangular lower part, a triangular upper part and a circular arc transition at the joint of the triangular structure and the rectangular structure.
Fig. 2 is a graph showing the voltage standing wave ratio of the bowtie-shaped deformation radar antenna according to the present invention. In the figure, the abscissa represents the frequency variation in MHz; the ordinate represents the amplitude variable. In the embodiment, the voltage standing wave coefficient of the antenna is less than 1.8 in the frequency band range of 10MHz-200 MHz. According to the fact that the standing-wave ratio coefficient of the vehicle-mounted ultra-wideband radar antenna of the common urban road is smaller than 2, the antenna can well meet the use requirements within the frequency band range of 10MHz-200 MHz.
Fig. 3 is a graph showing a time domain radiation waveform at the position 2m of the bowtie-deformation radar antenna according to the invention. In the figure, the abscissa represents a time variable in ns; the ordinate represents the electric field strength in units of V/m. As can be seen from the figure, the time domain radiation waveform oscillation tail of the butterfly deformation radar antenna is very small, the duration is less than half of the pulse width, the oscillation level is lower than 10%, and the time domain radiation characteristic is good.
In conclusion, the butterfly-shaped deformation radar antenna provided by the invention has the advantages of good time domain fidelity, small oscillation tailing, simple feeding mode, compact antenna size, easiness in radar miniaturization integration and vehicle loading, capability of meeting the detection distance and precision requirements of an urban road underground harmful body radar system, and convenience in industrial production.
While there have been shown and described what are at present considered the fundamental principles of the invention, its essential features and advantages, the invention further resides in various changes and modifications which fall within the scope of the invention as claimed.
Claims (2)
1. The butterfly-shaped deformation radar antenna is characterized by comprising a rectangular shielding cavity, an insulating dielectric plate, two radiation arms, four loading resistors and an input port, wherein the two radiation arms are symmetrically printed on the front surface of the insulating dielectric plate to form a planar dipole antenna, the upper parts of the radiation arms are triangular structures with opening angles at the tops not smaller than 90 degrees, and the lengths l and the opening angles theta of the radiation arms are designed according to the following formulaWherein λ is1Is a dayLine low frequency cut-off frequency corresponds to free space wavelength, theta is radiation arm opening angle, ZcThe lower part of the radiation arms is a rectangular structure for the characteristic impedance of the antenna, the total horizontal length of the triangle and the rectangle meets the resonance requirement of the antenna, the connection part of the triangle structure and the rectangular structure is in circular arc transition, a space is left between the two radiation arms, the two radiation arms adjacent to the space are respectively provided with an input port as the feed end of the antenna, the input port is connected with an external excitation signal source, signals are transmitted to the two radiation arms through the input port and radiate to the space through the radiation arms, the two sides of the bottom edge of the rectangular structure of the two radiation arms are respectively connected with a loading resistor, the other end of the loading resistor is connected with a rectangular shielding cavity to form a loading loop, the rectangular shielding cavity is a rectangular cavity with an opening on one side, the rectangular shielding cavity is made of aluminum materials with the thickness of 1mm, the height of the rectangular shielding cavity is 0.315 times of the free space wavelength corresponding to the central frequency of the antenna, and four sides of the rectangular shielding cavity are fixed with the edge of the insulating dielectric plate through nuts.
2. The bowtie radar antenna of claim 1, wherein: the method is characterized in that: the insulating medium plate is made of an epoxy resin glass fiber cloth laminated plate, the thickness of the insulating medium plate is 1-2mm, the opening angle of the top of the triangular structure of the radiation arm is between 90 degrees and 100 degrees, and the radiation arm is made of brass, gold, aluminum or iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610068088.XA CN105552533B (en) | 2016-02-01 | 2016-02-01 | Butterfly deforms radar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610068088.XA CN105552533B (en) | 2016-02-01 | 2016-02-01 | Butterfly deforms radar antenna |
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| Publication Number | Publication Date |
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| CN105552533A CN105552533A (en) | 2016-05-04 |
| CN105552533B true CN105552533B (en) | 2019-01-29 |
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| CN201610068088.XA Expired - Fee Related CN105552533B (en) | 2016-02-01 | 2016-02-01 | Butterfly deforms radar antenna |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299666A (en) * | 2016-09-26 | 2017-01-04 | 河南师范大学 | A kind of resistor loaded super wide band plane semiellipse antenna |
| CN107978850A (en) * | 2017-10-11 | 2018-05-01 | 武汉市工程科学技术研究院 | Carry on the back chamber butterfly ground exploring radar antenna device |
| CN109031210B (en) * | 2018-08-29 | 2023-12-26 | 中国电力工程顾问集团西北电力设计院有限公司 | Shielding device of geological radar low-frequency unshielded antenna |
| CN112816923B (en) * | 2020-12-29 | 2023-07-28 | 深圳市联影高端医疗装备创新研究院 | Ultra-high field emission shimming coil structure |
| CN116169468B (en) * | 2023-04-24 | 2023-07-18 | 吉林大学 | Ultra-wideband directional radiation antenna of ground penetrating radar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633428A (en) * | 2013-02-27 | 2014-03-12 | 中国科学院电子学研究所 | Ultra-wideband antenna for hand-held wall-through radar |
| CN203883121U (en) * | 2014-06-11 | 2014-10-15 | 中国科学院电子学研究所 | Bow-tie radar antenna |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005086536A (en) * | 2003-09-09 | 2005-03-31 | National Institute Of Information & Communication Technology | Printed antenna |
| JP4176613B2 (en) * | 2003-10-24 | 2008-11-05 | 株式会社ワイケーシー | Ultra-wideband antenna and ultra-wideband high-frequency circuit module |
| CN205488517U (en) * | 2016-02-01 | 2016-08-17 | 河南师范大学 | Radar antenna is warp to butterfly |
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2016
- 2016-02-01 CN CN201610068088.XA patent/CN105552533B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633428A (en) * | 2013-02-27 | 2014-03-12 | 中国科学院电子学研究所 | Ultra-wideband antenna for hand-held wall-through radar |
| CN203883121U (en) * | 2014-06-11 | 2014-10-15 | 中国科学院电子学研究所 | Bow-tie radar antenna |
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