CN108539405B - Butterfly microwave antenna and liquid security check instrument - Google Patents
Butterfly microwave antenna and liquid security check instrument Download PDFInfo
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- CN108539405B CN108539405B CN201810481197.3A CN201810481197A CN108539405B CN 108539405 B CN108539405 B CN 108539405B CN 201810481197 A CN201810481197 A CN 201810481197A CN 108539405 B CN108539405 B CN 108539405B
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- antenna
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/02—Measuring arrangements characterised by the use of fluids for measuring length, width or thickness
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- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention relates to the technical field of microwave antennas and discloses a butterfly-shaped microwave antenna and a liquid security check instrument, wherein the antenna comprises a shell and an antenna main body fixed at the opening end of the shell; the antenna main body comprises a substrate and a radiation substrate arranged on the substrate; the radiation substrate is arranged in a butterfly shape and respectively forms a signal transmitting part and a signal receiving part; the surface of the substrate, which is opposite to the shell, is covered with a loading ring made of metal materials, the loading ring comprises an outer ring and an isolation belt arranged on the outer ring in the radial direction, and the signal transmitting part and the signal receiving part are respectively positioned on two sides of the isolation belt; the housing is disposed on the back of the antenna body. The butterfly-shaped microwave antenna provided by the invention effectively enhances the directivity of signal transmission and improves the consistency of antenna gain, and has the advantages of small volume, simple structure, convenient processing and low cost; the ultra-wideband transmission of the antenna is realized, the detection range of the liquid detector is widened, the signal interference is reduced, the signal transmission precision is improved, and the detection accuracy is improved.
Description
Technical Field
The invention relates to the technical field of microwave antennas, in particular to a butterfly-shaped microwave antenna and a liquid security check instrument with the same.
Background
The liquid detection instrument provides a good traveling environment for people, and in security inspection procedures carried out in airports, subways, markets and the like, the liquid detection becomes more and more common, and the demand on the liquid detection instrument is gradually increased.
In recent years, microwave liquid detectors have been developed, which utilize microwave detection technology to detect the safety of liquid, and are known to have high accuracy and good safety performance, and thus have become the development direction of portable liquid detectors. The microwave is generated by a microwave oscillator, an oscillation signal is guided by a waveguide tube, is emitted out by a transmitting antenna, and is reflected by liquid and then is received by a receiving antenna to return a signal. The electromagnetic wave of the detected liquid is conducted through the transmitting-receiving antenna and analyzed and processed by the signal processing circuit to identify whether the liquid is dangerous or not.
The working frequency range of the receiving and transmitting antenna of the detector is required to be very wide under the influence of the diversity of the detected liquid, and because the transmitting signal generated by the antenna and the received return signal are ultra-wideband microwave signals, the ultra-wideband receiving and transmitting antenna is required to transmit signals. The existing liquid microwave detector has a narrow working frequency band, limits the types of detected liquid and has poor detection effect.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a butterfly-shaped microwave antenna and a liquid security check instrument with the butterfly-shaped microwave antenna, so as to widen the detection range of the conventional liquid security check instrument.
(II) technical scheme
In order to solve the technical problem, the invention provides a butterfly-shaped microwave antenna, which comprises a shell and an antenna main body fixed at the opening end of the shell;
the antenna main body comprises a substrate and a radiation substrate arranged on the substrate; the radiation substrate is arranged in a butterfly shape and respectively forms a signal transmitting part and a signal receiving part; the surface of the substrate, which is opposite to the shell, is covered with a loading ring made of metal materials, the loading ring comprises an outer ring and an isolation belt arranged on the outer ring in the radial direction, and the signal transmitting part and the signal receiving part are respectively positioned on two sides of the isolation belt;
the housing is disposed on a back surface of the antenna main body.
Wherein the radiating substrate is triangular.
Wherein, the radiation substrate is an isosceles triangle, and the vertex angles thereof are arranged adjacently.
Wherein the radiation substrate is an equilateral triangle.
The shell is columnar and comprises a shell and a partition plate, wherein the partition plate is arranged on the symmetrical plane of the shell to divide the inner space of the shell into a first reflection cavity and a second reflection cavity.
Wherein, the shell is provided with a through hole.
The invention also provides a liquid safety inspection instrument which is provided with the butterfly-shaped microwave antenna.
(III) advantageous effects
According to the butterfly-shaped microwave antenna, the three-dimensional conical antenna is simplified and deformed into the planar antenna, so that the directivity of signal transmission is effectively enhanced, the uniformity of antenna gain is improved, and the butterfly-shaped microwave antenna is small in size, simple in structure, convenient to process and lower in cost; the radiation substrate adopts a butterfly arrangement mode, a distributed loading technology is applied, ultra-wideband transmission of the antenna is realized, and the detection range of the liquid detector is widened; by arranging the outer ring in the loading ring, the radiation energy dissipated to the periphery of the antenna can be effectively restrained, and the directivity of the antenna is enhanced; by arranging the isolation band in the loading ring, the radiation wave coupling between the signal transmitting part and the signal receiving part can be greatly reduced, the signal interference is reduced, and the signal transmission precision is improved; set up the casing through the back at antenna body and form the reflection chamber, can restrain the unnecessary radiant energy in the antenna back and to a certain extent with antenna body back radiant energy reflection back main part openly, effectively reduce the back lobe level of antenna, when using in liquid security check appearance, can concentrate antenna radiant energy in examined bottle one side, reduce the backward radiant energy that the antenna was projected and is detected the face, avoided coming from the interference of circuit board one side, and then improve and detect the accuracy.
Drawings
Fig. 1 is a schematic diagram of a butterfly-shaped microwave antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a shell in a butterfly-shaped microwave antenna according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a main body in a butterfly-shaped microwave antenna according to an embodiment of the present invention;
fig. 4 is a schematic view of an installation position of a butterfly-shaped microwave antenna in a liquid security inspection instrument according to an embodiment of the present invention;
FIG. 5 is a perspective view of FIG. 4;
fig. 6 is a schematic working diagram of a liquid security inspection instrument according to an embodiment of the present invention;
FIG. 7 is a diagram of antenna reflected signals with different media in the antenna simulation process;
FIG. 8 is a graph showing the measurement at the processor end when the media are different in actual use;
in the figure, 1, a housing; 101. a side wall; 102. a bottom surface; 103. a partition plate; 104. a first reflective cavity; 105. a second reflective cavity; 106. a threaded hole; 107. a through hole; 2. an antenna main body; 201. a substrate; 202. a load ring; 2021. an isolation zone; 203. a signal transmitting section; 204. a signal receiving unit; 2041. a radiation substrate; 205. and (7) mounting holes.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Fig. 1 is a schematic diagram of a butterfly-shaped microwave antenna according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a shell in a butterfly-shaped microwave antenna according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of a main body in a butterfly-shaped microwave antenna according to an embodiment of the present invention; fig. 4 is a schematic view of an installation position of a butterfly-shaped microwave antenna in a liquid security inspection instrument according to an embodiment of the present invention; FIG. 5 is a perspective view of FIG. 4; FIG. 6 is a schematic diagram of a liquid safety inspection instrument according to an embodiment of the present invention; FIG. 7 is a diagram of antenna reflected signals with different media in the antenna simulation process; fig. 8 is a measurement curve of the processor side when the media are different in actual use.
As shown in fig. 1 to fig. 3, the butterfly-shaped microwave antenna provided by the embodiment of the present invention includes a housing 1, and an antenna main body 2 fixed at an open end of the housing 1.
The antenna main body 2 includes a substrate 201 and a radiation substrate 2041 disposed on the substrate 201, wherein the radiation substrate 2041 is arranged in a butterfly shape, and respectively constitutes a signal transmitting portion 203 and a signal receiving portion 204.
As shown in fig. 1 and 3, the substrate 201 is made of a rocky material, has low dielectric loss and low dielectric constant, and is suitable for designing and manufacturing microwave antennas. The radiating substrate 2041 is used to combine the signal transmitting portion 203 and the signal receiving portion 204 forming an antenna. The radiating substrate 2041 is etched onto the rockwell plate by a metal etching process, although other fabrication processes are possible.
Preferably, the radiating substrate 2041 is a triangle, more preferably an isosceles triangle, or an equilateral triangle, and each of the signal transmitting part 203 and the signal receiving part 204 comprises two equilateral triangle radiating substrates with their corners disposed adjacent to each other, as shown in fig. 2, and the adjacent four sides of the four substrates form an approximately square structure.
The surface of the substrate 201 opposite to the housing 1 is covered with a loading ring 202 made of a metal material, and the material of the loading ring 202 may be, but is not limited to, gold, silver, copper, and the like, and is preferably obtained by a copper coating preparation process. The load ring 202 includes an outer ring and an isolation zone 2021 disposed in a radial direction of the outer ring, and the signal transmitting section 203 and the signal receiving section 204 are respectively located on both sides of the isolation zone 2021. The circular outer ring can restrain the radiation energy dissipated to the periphery of the antenna, so that the directivity of the antenna is enhanced, and the isolation band 2021 can reduce the coupling of radiation waves between the signal transmitting part 203 and the signal receiving part 204 to the greatest extent, so as to reduce signal interference.
The substrate 201 is provided with a plurality of mounting holes 205 for fixing with the housing 1.
The housing 1 is provided on the rear surface of the antenna main body, and has a cross-sectional shape corresponding to the loading ring 202. As shown in fig. 2, the casing 1 is cylindrical and includes a casing and a partition 103, the casing includes a side wall 101 and a bottom surface 102, and the cross-sectional shape of the side wall 101 conforms to the shape of the outer ring; a partition 103 is provided on the symmetrical plane of the housing to divide the housing inner space into a first reflective cavity 104 and a second reflective cavity 105, the cross-sectional shape of the partition 103 conforming to the shape of the isolation belt 2021. The housing is provided with through holes 107, the through holes 107 being intended for the passage of wiring connecting the substrate and an external circuit board, for example a coaxial line in a liquid security check. The first reflective cavity 104 and the second reflective cavity 105 suppress unnecessary radiation energy on the back surface of the antenna and reflect the radiation energy on the back surface to one side of the measurement surface to a certain extent, thereby effectively reducing the back lobe level of the antenna to concentrate the radiation energy on the front surface of the antenna. The front surface of the antenna refers to a surface of the substrate 201 facing away from the housing 1, and as shown in fig. 1, the lower surface of the antenna main body 2 is the front surface of the antenna; the antenna back surface is a surface of the substrate 201 which is in fixed contact with the housing 1, i.e., a surface shown in fig. 3.
The side wall 101 of the housing 1 is provided with a threaded hole 106 corresponding to the mounting hole 205 for receiving a bolt or a screw to fix the substrate and the housing. The material of the shell is preferably aluminum.
The invention also provides a liquid safety inspection instrument which is provided with the butterfly-shaped microwave antenna as shown in the figures 4-6. The liquid safety inspection instrument is used for detecting whether liquid in the nonmetal container is dangerous liquid or not.
As shown in fig. 4 and 5, the microwave antenna is connected to the circuit board through a coaxial line, the antenna body 2 is tightly attached to the detection surface of the security check instrument, and the housing 1 is located on the side away from the detection surface so as to better transmit and receive signals. When the liquid is safely detected, the position of the test bottle body is as shown in fig. 6.
As shown in fig. 7, 7a is a reflection signal diagram of the antenna when the medium is air in the antenna simulation process, and 7b and 7c are reflection signal diagrams of the medium is water and alcohol, respectively. In 7a, it can be seen that in the 15G frequency range, for air, the antenna receives substantially no reflected energy, and the reflected energy in the whole frequency band is below-25 dB; in fig. 7b, the receiving antenna receives a certain amount of reflected energy in the whole frequency band in the 15G frequency range, which is especially obvious at low frequency, and the highest reflected energy reaches about-7 dB, but is more discrete; in 7c, it can be seen that the alcohol solution received by the receiving antenna in the 15G frequency range has a certain amount of reflected energy in the whole frequency band, and it is obvious at medium and high frequencies that the highest reflected energy reaches about-6 dB, and there is a strong reflected signal in a certain frequency band.
In practical application, microwave pulse signals generated by the security check instrument are emitted along the normal direction of the microwave detection surface, absorbed and reflected by liquid in the non-metal bottle body and then received by the signal receiving part 204, so that detectable echo signals are formed, the echo signals are collected by the CPU after frequency mixing, and judgment is performed, the echo signals generated by different liquids are different, and detection results are shown in fig. 8, wherein 8a, 8b, and 8c are detection results when media are air, water, and alcohol, respectively.
When liquid is detected, the container to be detected is placed on the side of the transmitting and receiving antenna for detection. The microwave meets liquid with different dielectric constants in the transmission process, the microwave absorption capacity of the liquid is in direct proportion to the dielectric constant of the liquid, and the energy reflected by the microwave can be used for judgment.
According to the butterfly-shaped microwave antenna, the three-dimensional conical antenna is simplified and deformed into the planar antenna, so that the directivity of signal transmission is effectively enhanced, the uniformity of antenna gain is improved, and the butterfly-shaped microwave antenna is small in size, simple in structure, convenient to process and lower in cost; the radiation substrate adopts a butterfly arrangement mode, a distributed loading technology is applied, ultra-wideband transmission of the antenna is realized, and the detection range of the liquid detector is widened; by arranging the outer ring in the loading ring, the radiation energy dissipated to the periphery of the antenna can be effectively restrained, and the directivity of the antenna is enhanced; by arranging the isolation band in the loading ring, the radiation wave coupling between the signal transmitting part and the signal receiving part can be greatly reduced, the signal interference is reduced, and the signal transmission precision is improved; set up the casing through the back at antenna body and form the reflection chamber, can restrain the unnecessary radiant energy in antenna back and reflect antenna body back radiant energy to a certain extent back main part openly, effectively reduce the back lobe level of antenna, when using in liquid safety inspection appearance, can concentrate antenna radiant energy in examining bottle one side, reduce the backward radiant energy that the antenna projected the detection face, avoided coming from the interference of circuit board one side, and then improve and detect the accuracy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A butterfly-shaped microwave antenna is characterized by comprising a shell and an antenna main body fixed at the opening end of the shell;
the antenna main body comprises a substrate and a radiation substrate arranged on the substrate; the radiation substrate is arranged in a butterfly shape and respectively forms a signal transmitting part and a signal receiving part; the surface of the substrate, which is opposite to the shell, is covered with a loading ring made of metal materials, the loading ring comprises an outer ring and an isolation belt arranged on the outer ring in the radial direction, and the signal transmitting part and the signal receiving part are respectively positioned on two sides of the isolation belt;
the casing sets up the back of antenna main part, the casing is the column, including shell and baffle, the baffle sets up on the plane of symmetry of shell, in order will shell inner space partition is first reflection chamber and second reflection chamber, just the cross sectional shape of baffle with the shape of median is unanimous.
2. The bowtie microwave antenna of claim 1, wherein said radiating substrate is triangular.
3. The butterfly microwave antenna of claim 2, wherein said radiating substrate is an isosceles triangle with vertex angles disposed adjacent.
4. The butterfly microwave antenna of claim 3, wherein the radiating substrate is an equilateral triangle.
5. The butterfly microwave antenna of claim 1, wherein the housing is formed with a through hole.
6. A liquid security check instrument, characterized in that it is provided with a butterfly microwave antenna according to any of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810481197.3A CN108539405B (en) | 2018-05-18 | 2018-05-18 | Butterfly microwave antenna and liquid security check instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810481197.3A CN108539405B (en) | 2018-05-18 | 2018-05-18 | Butterfly microwave antenna and liquid security check instrument |
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| Publication Number | Publication Date |
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| CN108539405A CN108539405A (en) | 2018-09-14 |
| CN108539405B true CN108539405B (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810481197.3A Active CN108539405B (en) | 2018-05-18 | 2018-05-18 | Butterfly microwave antenna and liquid security check instrument |
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| CN112595898A (en) * | 2020-12-07 | 2021-04-02 | 广州大学 | Method and device for measuring complex dielectric constant of liquid based on Wi-Fi signal |
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| CN201616503U (en) * | 2010-04-08 | 2010-10-27 | 湖南华诺星空电子技术有限公司 | Ultra-wide band transmitting/receiving antenna used for life SAR detecting instrument |
| CN102305800A (en) * | 2011-07-29 | 2012-01-04 | 华南理工大学 | Method and device for detecting flammable liquid based on ultra wide band |
| CN103022651A (en) * | 2011-09-21 | 2013-04-03 | 严志 | Butterfly antenna |
| CN103476334A (en) * | 2011-02-22 | 2013-12-25 | 纽默松尼克斯公司 | Planar antenna device and structure |
| CN203883121U (en) * | 2014-06-11 | 2014-10-15 | 中国科学院电子学研究所 | Bow-tie radar antenna |
| CN105490016A (en) * | 2016-01-21 | 2016-04-13 | 桂林电子科技大学 | Broadband directional antenna based on resonant reflector |
-
2018
- 2018-05-18 CN CN201810481197.3A patent/CN108539405B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201616503U (en) * | 2010-04-08 | 2010-10-27 | 湖南华诺星空电子技术有限公司 | Ultra-wide band transmitting/receiving antenna used for life SAR detecting instrument |
| CN103476334A (en) * | 2011-02-22 | 2013-12-25 | 纽默松尼克斯公司 | Planar antenna device and structure |
| CN102305800A (en) * | 2011-07-29 | 2012-01-04 | 华南理工大学 | Method and device for detecting flammable liquid based on ultra wide band |
| CN103022651A (en) * | 2011-09-21 | 2013-04-03 | 严志 | Butterfly antenna |
| CN203883121U (en) * | 2014-06-11 | 2014-10-15 | 中国科学院电子学研究所 | Bow-tie radar antenna |
| CN105490016A (en) * | 2016-01-21 | 2016-04-13 | 桂林电子科技大学 | Broadband directional antenna based on resonant reflector |
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