CN110854520A - K-band metamaterial microstrip antenna based on divinatory symbols - Google Patents
K-band metamaterial microstrip antenna based on divinatory symbols Download PDFInfo
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- CN110854520A CN110854520A CN201911161729.6A CN201911161729A CN110854520A CN 110854520 A CN110854520 A CN 110854520A CN 201911161729 A CN201911161729 A CN 201911161729A CN 110854520 A CN110854520 A CN 110854520A
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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
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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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention discloses a K-band metamaterial microstrip antenna based on divinatory symbols, which comprises an antenna substrate, a radiating microstrip patch, a metamaterial unit, a metal ground plate and a coaxial feed probe, wherein transition arc primitives of the metamaterial unit are three parallel broken lines with chamfers, the divinatory symbols are three parallel divinatory symbols, each divinatory symbol is a continuous straight line or a broken line with intervals, the continuous straight line is marked as 1 and the interval broken line is marked as 0, the divinatory symbols, the tremble symbols, the Kanggua symbols, the divinatory symbols and the divinatory symbols in the divinatory symbols correspond to coding combinations of 111, 110, 101, 011, 001, 010, 100 and 000 respectively, and the structure of each divinatory symbol is one of the eight divinatory symbols. The K-band metamaterial microstrip antenna based on the divinatory symbols not only solves the problem of low gain of the traditional microstrip antenna, but also greatly simplifies the complex structure of a metamaterial unit, and has the advantages of simple preparation and high gain.
Description
Technical Field
The invention relates to the technical field of communication antennas, in particular to a K-band metamaterial microstrip antenna based on a divinatory symbol.
Background
The microstrip antenna has the advantages of low profile, light weight and easy conformality, and is widely applied to the field of electronic communication, but the microstrip antenna has large loss and low gain, so that the improvement of the gain of the microstrip antenna becomes a hotspot of research. At present, a plurality of methods for improving the gain of a microstrip antenna are available, the traditional method comprises the application of an antenna array, a loading reflector, a metamaterial Frequency Selective Surface (FSS), a zero-refractive-index material and a high-resistance surface, a new method is brought for improving the gain of the antenna, and a plurality of scholars research and achievements. However, inspiration is sought from ancient eight diagrams in China, and a metamaterial design method for inhibiting microstrip antenna surface waves by utilizing electromagnetic resonance forbidden bands generated by the on-off of the diagram lines is not researched yet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a K-band metamaterial microstrip antenna based on the divinatory symbols, which inhibits the surface wave of the microstrip antenna and improves the gain of the antenna by the divinatory symbols on a substrate.
In order to achieve the purpose, the K-band metamaterial microstrip antenna based on the divinatory symbols comprises an antenna substrate, wherein a metal ground plate is arranged on the lower surface of the antenna substrate, a microstrip patch is arranged in the middle of the upper surface of the antenna substrate, a coaxial line feed probe is arranged on the microstrip patch, and the metamaterial unit is etched on the upper surface of the antenna substrate and outside the microstrip patch The divinatory trigrams, the seismograms, the cangbrams, the divinatory trigrams and the divinatory trigrams correspond to coding combinations of 111, 110, 101, 011, 001, 010, 100 and 000 respectively, and the structure of each divinatory trigram is one of the eight trignatory coding combinations.
Furthermore, each divinatory diagram line in the divinatory diagram type elements corresponds to a design variable, a solving strategy based on a genetic algorithm is carried out after 0-1 coding is carried out on the divinatory diagram lines, and the structural arrangement of the divinatory diagram type elements is determined by using an MATLAB interface tool box.
Furthermore, the number of the transition arc elements is 4, and the number of the diagram-shaped elements is 12.
Furthermore, the broken lines of the transition arc primitives are mutually perpendicular straight lines and are connected by a quarter arc transition.
Furthermore, the divinatory symbols structure codes of the divinatory symbols type elements are respectively: 000. 000, 100, 110, 101, 010, 001, 011.
Furthermore, the vertical spacing between the diagram lines of the diagram-shaped elements is 0.35mm, and the continuous straight line is 1.7 × 0.35 × 0.017mm of copper metal lines; the interval broken line is two copper metal wires with the thickness of 0.6X 0.35X 0.017mm, and the horizontal interval of the two copper metal wires is 0.5 mm.
Furthermore, the characteristic impedance of the coaxial line feed probe is 50 ohms, the coaxial line feed probe is located in the center of the antenna and is offset towards the width direction of the microstrip patch, and the offset distance is 1.2523 mm.
Furthermore, the antenna substrate material is polytetrafluoroethylene with a dielectric constant of 2.25.
Compared with the prior art, the K-band metamaterial microstrip antenna based on the trigram-type elements not only solves the problem of low gain of the traditional microstrip antenna, but also greatly simplifies the complex structure of metamaterial units, and has the advantages of simple preparation and high gain. The divinatory symbols adopt the circuit board etching technology, the structure is simple, no small-size structure exists, and the manufacturability is greatly improved. The metamaterial unit composed of the divinatory symbols can obviously inhibit the surface wave of the antenna and improve the gain of the microstrip antenna, and has the advantages of regular and compact integral structure, small occupied space, obviously improved antenna gain and low preparation cost.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic top view of fig. 1.
FIG. 3 is a schematic diagram of a discrete metamaterial unit structure according to an embodiment of the present invention.
Fig. 4 is a schematic design structure diagram of the metamaterial unit in fig. 3.
Fig. 5 is a diagram illustrating simulation results according to an embodiment of the present invention.
In the figure: the antenna comprises an antenna substrate 1, a microstrip patch 2, a metamaterial unit 3, a metal ground plate 4 and a coaxial feed probe 5.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 1 and 2, the K-band metamaterial microstrip antenna based on the divinatory symbols comprises an antenna substrate 1, a metal ground plate 4 is arranged on the lower surface of the antenna substrate 1, a microstrip patch 2 is arranged in the middle of the upper surface, a coaxial feed probe 5 is arranged on the microstrip patch 2, and a metamaterial unit 3 is etched on the upper surface of the antenna substrate 1 and the outside of the microstrip patch 2. The metamaterial unit 3 is a frame-shaped closed structure and comprises transition arc elements arranged at four corners and trigram-shaped elements arranged between the transition arc elements.
The transition circular arc elements are three mutually parallel broken lines with chamfers, and the broken lines of the transition circular arc elements are mutually vertical straight lines and are in transition connection through a quarter of circular arc.
By taking the reference of the yin-yang system of the eight diagrams representing the change of things, the symbol "one" represents yang and the symbol "-" represents yin, wherein the symbol "yin" and "yang" are corresponding to the "break" and "connect" of each diagram line. Each divinatory symbols comprises three divinatory symbols, each divinatory symbol has two states of 'broken' and 'connected', so that the divinatory symbols are all eight divinatory symbols, and the structure of the divinatory symbols is a combination of several of the eight divinatory symbols. The trigram-type elements are three-phase trigram lines which are parallel to each other, each trigram line is a continuous straight line or a broken line with intervals, the continuous straight line is marked as 1, the broken line with intervals is marked as 0, the trigrams of the trigrams, the sons, the divinatory trigrams, the seismograms, the divinatory trigrams, the kangbua, the trigrams and the divinatory trigrams in the trigrams correspond to coding combinations of 111, 110, 101, 011, 001, 010, 100 and 000 respectively, and the structure of each trigram-type element is one of the trigram coding combinations. The frequency of a forbidden band generated by the metamaterial unit 3 with the trigram-shaped elements is matched with the central working frequency of the antenna, and the surface wave excited by the microstrip antenna during working and the parasitic radiation of the feed network can be effectively inhibited by utilizing the forbidden band characteristic of the metamaterial unit, so that the radiation performances of the microstrip antenna, such as gain, and the like, are improved. The divinatory symbols are prepared by a circuit board etching technology, the structure is simple, a small-size structure does not exist, and the manufacturability is greatly improved.
In one embodiment of the present invention, as shown in fig. 3 and 4, a metal ground plate 4 is disposed on the lower surface of an antenna substrate 1, a microstrip patch 2 is disposed in the middle of the upper surface, a coaxial line feed probe 5 is disposed on the microstrip patch 2, and a metamaterial unit 3 is disposed on the edge of the upper surface.
The antenna substrate 1 is a polyethylene plate with 10 × 1mm, the insulating property is good, and the lower dielectric constant is beneficial to increasing the bandwidth of the antenna. The thickness of the antenna substrate 1 is less than one fifth of the operating wavelength of the antenna, here taken to be 1 mm. The microstrip patch 2 is a metal radiation patch with a copper coating, the length and the width of the microstrip patch 2 are 4.9029mm and 3.4714mm respectively, the specification is small, and the miniaturization of the antenna is easy to realize. The divinatory symbols type metamaterial unit 3 with an artificial structure has the electromagnetic super-characteristic of inhibiting the surface wave of the antenna and improving the gain of the antenna. The coaxial feed probe 5 is offset from the positive center of the antenna to the width of the microstrip patch 2 by 1.2523 mm. The metal grounding plate 4 is a copper coating layer, and the copper coating thickness is 0.017 mm.
The metamaterial unit 3 consists of 12 groups of trigram-shaped elements and 4 groups of arc transition elements, wherein the vertical distance between every two trigram lines in the trigram-shaped elements is 0.35mm, the line width of the trigram lines is 0.35mm, no distance is arranged in the horizontal direction of every two trigram-shaped elements, the distance between every two trigram lines in the quarter arc transition trigram-shaped elements is 0.35mm, and the connecting line in the trigram-shaped elements is 1.7-0.35-0.017 mm copper metal lines; the broken line in the diagram line is two copper metal lines with the thickness of 0.6 x 0.35 x 0.017mm, and the horizontal interval of the two metal lines is 0.5 mm.
Each divinatory diagram line in the divinatory diagram type element corresponds to a design variable, a solving strategy based on a genetic algorithm is carried out after 0-1 coding is carried out on the divinatory diagram line, and an MATLAB interface tool box is used for modeling and optimizing the metamaterial microstrip antenna so as to determine the structural arrangement of the divinatory diagram type element.
The 12 trigram-type elements include three divinatory trigrams, three fortunes, two sons trigrams, a divinatory trigram, a kan trigram, a seismogram and a divinatory trigram, and the corresponding eight trigrams are coded as: 000. 000, 100, 110, 101, 010, 001, 011.
The upper end of the coaxial feed probe 5 is connected with the microstrip radiation patch 2, and the lower end is connected with the metal grounding plate 4 connected with the antenna substrate 1. The metal ground plate 4 is 10 × 0.035mm in size, i.e., a copper cladding is etched over the entire back side of the substrate. The antenna substrate 1, the metal radiating microstrip patch 2, the metamaterial unit 3, the metal ground plate 4 and the coaxial feed probe 5 are combined to form the microstrip antenna, the metamaterial unit 3 formed by the divinatory type elements can obviously inhibit the surface wave of the antenna and improve the gain of the microstrip antenna, and the microstrip antenna has the advantages of regular and compact integral structure, small occupied space, obviously improved antenna gain and low preparation cost.
The microstrip antenna of the metamaterial unit 3 designed in the embodiment is simulated, fig. 5 shows two-dimensional and three-dimensional far-field radiation gain patterns of the metamaterial microstrip antenna, and the maximum gain of the microstrip antenna can be seen from the patterns to be 9.552dB, which is obviously higher than the gain of a common 24GHz microstrip antenna without the metamaterial by 7.78 dB.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the patent solution and not for limiting, and those skilled in the art should understand that the technical solution of the patent can be modified or substituted with equivalent without departing from the spirit and scope of the patent solution, which shall be covered by the claims of the patent.
Claims (8)
1. The utility model provides a K wave band metamaterial microstrip antenna based on divinatory symbols type primitive, includes antenna substrate (1), the lower surface of antenna substrate (1) is provided with metal ground plate (4), and the upper surface middle part is provided with microstrip paster (2), be provided with coaxial line feed probe (5) on microstrip paster (2), the super material unit of upper surface, the outside sculpture (3) of microstrip paster (2) of antenna substrate (1), its characterized in that: the metamaterial unit (3) is of a frame-shaped closed structure and comprises transition arc elements arranged at four corners and trigram-shaped elements arranged between the transition arc elements, the transition arc elements are three parallel broken lines with chamfers, the trigram-shaped elements are three parallel trigram lines, each trigram line is a continuous straight line or a broken line with intervals, the continuous straight line is marked as 1 and the interval broken line is marked as 0, the trigram, the son trigram, the separation trigram, the divinatory trigram, the earthquake trigram, the kan trigram, the trigram and the divinatory trigram in the trigram respectively correspond to coding combinations of 111, 110, 101, 011, 001, 010, 100 and 000, and the structure of each trigram-shaped element is one of the trigram coding combinations.
2. The K-band metamaterial microstrip antenna based on the trigram-type elements as claimed in claim 1, wherein: each divinatory diagram line in the divinatory diagram type element corresponds to a design variable, the divinatory diagram lines are subjected to 0-1 coding, a solving strategy based on a genetic algorithm is carried out, and an MATLAB interface tool box is used for determining the structural arrangement of the divinatory diagram type element.
3. The K-band metamaterial microstrip antenna based on the trigram-type elements as claimed in claim 1, wherein: the number of the transition arc elements is 4, and the number of the divinatory symbols is 12.
4. The K-band metamaterial microstrip antenna based on the trigram-type elements as claimed in claim 1, wherein: the broken lines of the transition arc primitives are mutually vertical straight lines and are in transition connection through a quarter of arc.
5. The K-band metamaterial microstrip antenna based on the trigram-type elements as claimed in claim 3, wherein: the divinatory symbols structure code of the divinatory symbols type element is: 000. 000, 100, 110, 101, 010, 001, 011.
6. The K-band metamaterial microstrip antenna based on the trigram-type elements as claimed in claim 1, wherein: the vertical spacing between the diagram lines of the diagram-shaped elements is 0.35mm, and the continuous straight line is 1.7 × 0.35 × 0.017mm of copper metal lines; the interval broken line is two copper metal wires with the thickness of 0.6X 0.35X 0.017mm, and the horizontal interval of the two copper metal wires is 0.5 mm.
7. The K-band metamaterial microstrip antenna based on the trigram-type elements as claimed in claim 1, wherein: the characteristic impedance of the coaxial line feed probe (5) is 50 ohms, the coaxial line feed probe is located in the center of the antenna and deviates towards the width direction of the microstrip patch (2), and the deviation distance is 1.2523 mm.
8. The K-band metamaterial microstrip antenna based on the trigram-type elements as claimed in claim 1, wherein: the antenna substrate material (1) is polytetrafluoroethylene with a dielectric constant of 2.25.
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| CN113328242A (en) * | 2021-06-08 | 2021-08-31 | 湖北汽车工业学院 | High-preparation-performance hexagram-shaped element metamaterial coating type microstrip antenna and design method thereof |
| CN114976622A (en) * | 2022-07-05 | 2022-08-30 | 天津理工大学 | quasi-Taiji-shaped dual-frequency microstrip patch antenna loaded with eight-diagram-shaped parasitic patches |
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Cited By (3)
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| CN113328242A (en) * | 2021-06-08 | 2021-08-31 | 湖北汽车工业学院 | High-preparation-performance hexagram-shaped element metamaterial coating type microstrip antenna and design method thereof |
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| CN114976622A (en) * | 2022-07-05 | 2022-08-30 | 天津理工大学 | quasi-Taiji-shaped dual-frequency microstrip patch antenna loaded with eight-diagram-shaped parasitic patches |
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Effective date of registration: 20231007 Address after: 442000 Fangding Industrial Park, Fazhan Avenue, Zhangwan District, Shiyan City, Hubei Province Patentee after: HUBEI FANG DING TECHNOLOGY DEVELOPMENT CO.,LTD. Address before: 442000 No. 167 Checheng West Road, Shiyan City, Hubei Province Patentee before: Hubei University of Automobile Technology |