CN210778977U - Fractal monopole array ultra-wideband positioning beacon antenna structure - Google Patents
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Abstract
The utility model provides a fractal monopole array ultra wide band positioning beacon antenna structure, including the base plate, paste the fractal monopole radiation paster array who covers in the base plate front, paste the antenna ground plate who covers in the base plate back and be located the gradual change structure reflecting plate of base plate below; the fractal monopole radiation patch array comprises a plurality of fractal monopole radiation patches; the fractal monopole radiation patch comprises a feeder line and a corner cut fractal patch connected with the feeder line; a corresponding gradient structure reflection unit is arranged at the position of the gradient structure reflection plate below each angle-cutting fractal patch; the gradient structure reflection unit comprises a metal annular part at the periphery, a middle semiconductor annular part and a central insulating part; the insulating part is formed by arranging a plurality of sheet-shaped pieces with gradually changed dielectric constants in a rectangular shape; in the gradual change structure reflection unit, the relative dielectric constant of each sheet-shaped piece gradually changes one by one according to the arrangement sequence; the product can completely cover the ultra-wideband communication frequency band, has good radiation directivity and small antenna size, and can be conformal with a positioning beacon.
Description
Technical Field
The utility model belongs to the technical field of the antenna technology and specifically relates to fractal monopole array ultra wide band location beacon antenna structure.
Background
The indoor positioning technology is a high-precision positioning technology in the indoor environment of a building, can realize real-time tracking and positioning of indoor personnel and objects by means of wireless communication and positioning beacons, and is increasingly applied to fields of industrial 4.0 smart factories, unattended exhibition and vending systems, modern warehouse logistics, important personnel and equipment management and control, intelligent navigation in the building, intelligent medical guidance of hospitals and the like.
The ultra-wideband positioning technology is a radio indoor positioning technology with the highest positioning precision at present, has stronger penetrating power, higher time resolution and better anti-multipath effect capability, and can realize the positioning precision of an article level and the accurate distance measurement of a millimeter level under an indoor environment. In 9 months 2019, an iPhone11 mobile phone issued by apple Inc. in the United states is integrated with an ultra wide band chip, and an ultra wide band positioning technology becomes a mainstream technology in the field of indoor positioning.
The frequency band of ultra wide band communication is 3.100 ~ 10.600 GHz, and ultra wide band location beacon antenna need can ultra wide band work and stable radiation, can cover the ultra wide band communication frequency band completely, and the radiation directionality is better, and electric face directional diagram and magnetic face directional diagram all have less zero power point lobe width and half-power point lobe width, lower side lobe level, higher front-to-back ratio, and the antenna size is less, can be conformal with the location beacon.
Disclosure of Invention
The utility model provides a fractal monopole array ultra wide band location beacon antenna structure can cover ultra wide band communication frequency channel completely, and the radiation directionality is better, and the antenna size is less, can be conformal with the location beacon.
The utility model adopts the following technical scheme.
The fractal monopole array ultra-wideband positioning beacon antenna structure comprises a substrate, a fractal monopole radiation patch array attached to the front surface of the substrate, an antenna ground plate attached to the back surface of the substrate and a gradually-changed structure reflecting plate positioned below the substrate; the fractal monopole radiation patch array comprises a plurality of fractal monopole radiation patches; the fractal monopole radiation patch comprises a feeder line and a corner cut fractal patch connected with the feeder line; a gradual change structure reflection unit corresponding to the radiation patch is arranged at the gradual change structure reflection plate below each angle-cutting fractal patch; the gradient structure reflection unit comprises a metal annular part at the periphery, a middle semiconductor annular part and a central insulation part; the insulating part is formed by arranging a plurality of sheet-shaped pieces with gradually changed dielectric constants in a rectangular manner; in the same gradient structure reflection unit, the relative dielectric constant of each sheet-shaped piece is gradually changed according to the arrangement sequence.
The overlooking direction of the corner cut fractal patch is a face fractal iteration structure, and the zeroth-order structure of the face fractal iteration structure is a square;
the first-order structure of the face fractal iteration structure is a structure which is obtained by chamfering a zero-order structure and consists of 4 right-angled triangles and 12 small squares; the corner cutting treatment is to divide a square in an original iterative structure into sixteen smaller squares, and then to cut the squares positioned at the corners of the iterative structure in the divided small squares, wherein the cutting treatment is to cut half of the squares along the diagonal lines of the squares;
the second-order structure of the face fractal iteration structure is obtained by subjecting cubes in the first-order structure to corner cutting treatment again; the higher-order structure of the face fractal iteration structure is obtained by chamfering the square in the last order.
The order of the face type fractal iteration structure of the corner cut fractal patch is not lower than the second order; the metal annular part of the gradient structure reflection unit is formed by gold, silver or copper; the semiconductor annular part of the gradient structure reflection unit is molded by monocrystalline silicon material.
The order of the face type fractal iteration structure of the corner cut fractal patch is second order; the sheet-shaped piece in the center of the reflection unit with the gradual change structure is a ceramic piece.
The insulation part in the center of the gradient structure reflection unit is divided into 6 rows and 6 columns of 36 ceramic sheets with the same size, the relative dielectric constant of each ceramic sheet gradually changes from top to bottom and from left to right, and the relative dielectric constant difference of two adjacent ceramic sheets is 1.
A plurality of fractal monopole radiation patches in the fractal monopole radiation patch array are linearly arranged; the number of the fractal monopole radiation patches and the number of the gradient structure reflection units are three;
at the position of the gradient structure reflecting plate, in the insulating part of the left gradient structure reflecting unit, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left part is 10 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right part is 20 +/-0.1; in the insulating part of the middle gradient structure reflecting unit, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left part is 12 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right part is 22 +/-0.1; in the insulating part of the reflecting unit with the gradual change structure on the right side, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left side is 14 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right side is 24 +/-0.1;
and the feeder line of each fractal monopole radiation patch is connected with the antenna feed point below the fractal monopole radiation patch.
The gradient structure reflection unit is a periodic distribution structure of a semiconductor layer and an insulator layer in a metal conductor layer, and the periodic distribution structure is a photonic crystal structure capable of generating a photonic band gap to prevent electromagnetic waves with preset frequency from propagating.
The antenna radiation patch is formed by copper, silver, gold or aluminum; the antenna ground plate is formed of copper, silver, gold, or aluminum.
The antenna grounding plate is of a full-conductive grounding structure, and the relative dielectric constant of the substrate is 6.0-7.0.
The substrate is a low-loss epoxy resin glass cloth substrate, the substrate is rectangular, the size of the substrate is 45mm +/-1 mm multiplied by 15mm +/-1 mm, and the thickness of the substrate is 1mm +/-0.1 mm;
the size of the gradually-changed structure reflecting plate is 45mm +/-1 mm multiplied by 15mm +/-1 mm, the thickness of the gradually-changed structure reflecting plate is 1mm +/-0.1 mm, and the gradually-changed structure reflecting plate comprises 3 gradually-changed structure reflecting units which are linearly arranged; the outermost ring of each gradient structure reflection unit is an outer ring formed by copper or silver or gold, and the outer ring is a square ring conductor layer with the side length of 15mm +/-0.1 mm and the inner ring with the side length of 12 mm +/-0.1 mm; the middle ring of each gradient structure reflection unit is a square ring semiconductor layer which is formed by monocrystalline silicon material and has the outer edge length of 12 mm +/-0.1 mm and the inner edge length of 9 mm +/-0.1 mm; the center of each gradient structure reflection unit is a square insulator layer with the side length of 9 mm +/-0.1 mm, which is formed by ceramic materials with gradient dielectric constants;
the size of the fractal monopole radiation patch array is 45mm +/-1 mm multiplied by 15mm +/-1 mm; the fractal monopole radiation patch consists of a feeder line with the size of 5mm +/-1 mm multiplied by 1mm +/-0.1 mm and a corner cut fractal patch with the size of 8mm +/-1 mm multiplied by 8mm +/-1 mm.
The working frequency band range of the antenna is 2.178-11.402 GHz.
The antenna of the utility model combines the microstrip monopole antenna with the corner cut fractal structure, realizes the wide frequency work of the antenna with stronger directivity, and utilizes the linear array arrangement mode to form an array, further improves the radiation intensity of the antenna, and strengthens the directivity of the antenna; the metal conductor is used as a main body structure, the semiconductor layer and the insulator layer are periodically distributed in the metal conductor layer, the gradient structure reflecting plate is designed, and the radiation directivity of the antenna is effectively improved by utilizing the reflection of the metal conductor and the electromagnetic wave propagation blocking effect of the photonic band gap generated by the photonic crystal.
The actual measurement result of the antenna shows that the working frequency band range of the antenna is 2.178-11.402 GHz, the working bandwidth is 9.224 GHz, the bandwidth octave is 5.24, the return loss of the antenna in the whole working frequency band is lower than-10 dB, and the minimum value of the return loss is-38.18 dB. The antenna completely covers the 3.100-10.600 GHz frequency band of ultra-wideband communication. The maximum gain of a main lobe of the antenna is 13.72 dB, the lobe width of a zero-power point of the electric surface is 80 degrees, the lobe width of a half-power point of the electric surface is 45 degrees, the level of a side lobe of the electric surface is-10.13 dB, and the front-to-back ratio of the electric surface is 9.41 dB; the lobe width of a zero-power point of the magnetic surface is 80 degrees, the lobe width of a half-power point of the magnetic surface is 41 degrees, the level of a side lobe of the magnetic surface is-7.85 dB, and the front-to-back ratio of the magnetic surface is 7.61 dB; the antenna has good directional radiation capability.
With the conventional antenna comparison that is used for ultra wide band location beacon, the antenna has outstanding advantage and the effect that is showing: the antenna has a large working bandwidth, stable radiation in a working frequency band and small fluctuation of a return loss value, and can ensure stable and reliable work of the ultra-wideband positioning beacon in the whole ultra-wideband communication frequency band; the size of the antenna is only 45mm multiplied by 15mm multiplied by 2 mm, the antenna has the advantage in miniaturization, can be placed in an ultra-wideband positioning beacon, and also can be placed on the outer surface of the ultra-wideband positioning beacon to be conformal with the beacon; the antenna has excellent directional radiation capability, and the electric plane directional diagram and the magnetic plane directional diagram have smaller zero-power point lobe width, half-power point lobe width, lower side lobe level and higher front-to-back ratio.
The utility model discloses well radiation structure has adopted corner cut fractal structure, in-process that the iteration generated, radiation structure's border and inside constantly form the gap structure that has from the similarity, when being used for the antenna, it has guaranteed from the similarity that the antenna is inside to have evenly distributed's radio frequency current, the radiation that these gaps produced can produce superposition effect, guarantee that the antenna has broadband radiation working ability, and a plurality of fractal monopole radiation paster constitute fractal monopole radiation paster array according to the linear array mode of arranging, can utilize directional diagram product principle further to improve antenna radiation intensity and strengthen the directionality of antenna.
The utility model discloses in, gradual change structure reflecting plate, gradual change structure reflection unit are whole can be regarded as semiconductor layer and insulator layer and distribute inside metallic conductor layer periodically, and this kind of periodic structure is a photonic crystal structure, can produce the photonic band gap, prevents the propagation of certain frequency electromagnetic wave. The utility model discloses a three gradual change structure reflection unit, total 108 potsherds, relative dielectric constant follow 10 0.1, gradually become 24 0.1, and this will make the photonic crystal structure obtain the photonic band gap of broad, effectively prevents the electromagnetic wave propagation of ultra wide band communication frequency channel, in addition, the utility model discloses a main structure of gradual change structure reflecting plate is metallic conductor, also can utilize metallic conductor's reflection effect to realize the reflection to the top antenna radiation. After the gradient structure reflecting plate is used, the reflection of the metal conductor is superposed with the effect of blocking the electromagnetic wave propagation of the photonic band gap, so that the whole antenna is almost zero-radiated on one side of the gradient structure reflecting plate, and the directivity of the antenna is obviously improved.
Drawings
The invention will be described in further detail with reference to the following drawings and detailed description:
fig. 1 is a schematic diagram of the conversion generation of each order of the planar fractal iteration structure of the present invention;
fig. 2 is a schematic layered view of the antenna of the present invention;
fig. 3 is a schematic diagram of a fractal monopole radiating patch array;
FIG. 4 is a schematic diagram of the arrangement of the gradually-changing structure reflection unit on the gradually-changing structure reflection plate (the numbers on the ceramic plates indicate the corresponding dielectric constants);
FIG. 5 shows the return loss (S) of the present invention11) A performance schematic;
FIG. 6 is a schematic view of the electrical surface direction of the present invention;
FIG. 7 is a schematic view of the magnetic surface direction of the present invention;
in the figure: 1-fractal monopole radiating patch array; 2-a substrate; 3-an antenna ground plane; 4-a graded-structure reflector plate; 5-a feeder; 6-cutting the corner fractal patch; 7-antenna feed point; 8-a metal ring; 9-a semiconductor ring; 100-an insulating part; 101-a sheet-shaped piece.
Detailed Description
As shown in fig. 1-7, the fractal monopole array ultra-wideband positioning beacon antenna structure includes a substrate 2, a fractal monopole radiation patch array 1 attached to the front surface of the substrate, an antenna ground plate 3 attached to the back surface of the substrate, and a gradually-varying structure reflection plate 4 located below the substrate; the fractal monopole radiation patch array comprises a plurality of fractal monopole radiation patches; the fractal monopole radiation patch comprises a feeder 5 and a corner cut fractal patch 6 connected with the feeder; a gradual change structure reflection unit corresponding to the radiation patch is arranged at the gradual change structure reflection plate below each angle-cutting fractal patch; the graded-structure reflection unit comprises a metal annular part 8 at the periphery, a middle semiconductor annular part 9 and a central insulating part 100; the insulating part is formed by arranging a plurality of sheet-shaped pieces 101 with gradually changed dielectric constants according to a rectangle; in the same gradient structure reflection unit, the relative dielectric constant of each sheet-shaped piece is gradually changed according to the arrangement sequence.
The overlooking direction of the corner cut fractal patch is a face fractal iteration structure, and the zeroth-order structure of the face fractal iteration structure is a square;
the first-order structure of the face fractal iteration structure is a structure which is obtained by chamfering a zero-order structure and consists of 4 right-angled triangles and 12 small squares; the corner cutting treatment is to divide a square in an original iterative structure into sixteen smaller squares, and then to cut the squares positioned at the corners of the iterative structure in the divided small squares, wherein the cutting treatment is to cut half of the squares along the diagonal lines of the squares;
the second-order structure of the face fractal iteration structure is obtained by subjecting cubes in the first-order structure to corner cutting treatment again; the higher-order structure of the face fractal iteration structure is obtained by chamfering the square in the last order.
The order of the face type fractal iteration structure of the corner cut fractal patch is not lower than the second order; the metal annular part of the gradient structure reflection unit is formed by gold, silver or copper; the semiconductor annular part of the gradient structure reflection unit is molded by monocrystalline silicon material.
The order of the face type fractal iteration structure of the corner cut fractal patch is second order; the sheet-shaped piece in the center of the reflection unit with the gradual change structure is a ceramic piece.
The insulation part in the center of the gradient structure reflection unit is divided into 6 rows and 6 columns of 36 ceramic sheets with the same size, the relative dielectric constant of each ceramic sheet gradually changes from top to bottom and from left to right, and the relative dielectric constant difference of two adjacent ceramic sheets is 1.
A plurality of fractal monopole radiation patches in the fractal monopole radiation patch array are linearly arranged; the number of the fractal monopole radiation patches and the number of the gradient structure reflection units are three;
at the position of the gradient structure reflecting plate, in the insulating part of the left gradient structure reflecting unit, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left part is 10 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right part is 20 +/-0.1; in the insulating part of the middle gradient structure reflecting unit, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left part is 12 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right part is 22 +/-0.1; in the insulating part of the reflecting unit with the gradual change structure on the right side, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left side is 14 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right side is 24 +/-0.1;
and the feeder line of each fractal monopole radiation patch is connected with the antenna feed point 7 below.
The gradient structure reflection unit is a periodic distribution structure of a semiconductor layer and an insulator layer in a metal conductor layer, and the periodic distribution structure is a photonic crystal structure capable of generating a photonic band gap to prevent electromagnetic waves with preset frequency from propagating.
The antenna radiation patch is formed by copper, silver, gold or aluminum; the antenna ground plate is formed of copper, silver, gold, or aluminum.
The antenna grounding plate is of a full-conductive grounding structure, and the relative dielectric constant of the substrate is 6.0-7.0.
The substrate is a low-loss epoxy resin glass cloth substrate, the substrate is rectangular, the size of the substrate is 45mm +/-1 mm multiplied by 15mm +/-1 mm, and the thickness of the substrate is 1mm +/-0.1 mm;
the size of the gradually-changed structure reflecting plate is 45mm +/-1 mm multiplied by 15mm +/-1 mm, the thickness of the gradually-changed structure reflecting plate is 1mm +/-0.1 mm, and the gradually-changed structure reflecting plate comprises 3 gradually-changed structure reflecting units which are linearly arranged; the outermost ring of each gradient structure reflection unit is an outer ring formed by copper or silver or gold, and the outer ring is a square ring conductor layer with the side length of 15mm +/-0.1 mm and the inner ring with the side length of 12 mm +/-0.1 mm; the middle ring of each gradient structure reflection unit is a square ring semiconductor layer which is formed by monocrystalline silicon material and has the outer edge length of 12 mm +/-0.1 mm and the inner edge length of 9 mm +/-0.1 mm; the center of each gradient structure reflection unit is a square insulator layer with the side length of 9 mm +/-0.1 mm, which is formed by ceramic materials with gradient dielectric constants;
the size of the fractal monopole radiation patch array is 45mm +/-1 mm multiplied by 15mm +/-1 mm; the fractal monopole radiation patch consists of a feeder line with the size of 5mm +/-1 mm multiplied by 1mm +/-0.1 mm and a corner cut fractal patch with the size of 8mm +/-1 mm multiplied by 8mm +/-1 mm.
The working frequency band range of the antenna is 2.178-11.402 GHz.
Fig. 5 shows return loss (S) of an embodiment of the present invention11) And (6) performance graphs. As can be seen from FIG. 5, the actual measurement result shows that the working frequency band range of the antenna is 2.178-11.402 GHz, the working bandwidth is 9.224 GHz, the bandwidth octave is 5.24, and the minimum value of the return loss is-38.18 dB. Figure 6 of the description attached drawing shows the electric surface directional diagram of the embodiment of the utility model, figure 7 of the description attached drawing shows the magnetic surface directional diagram of the embodiment of the utility model, can be seen from figure 6 and figure 7, the actual measurement result shows that the main lobe maximum gain of this kind of antenna is 13.72 dB, electric surface zero power point lobeThe width is 80 degrees, the electric surface half-power point lobe width is 45 degrees, the electric surface side lobe level is-10.13 dB, and the electric surface front-to-back ratio is 9.41 dB; the width of a magnetic surface zero-power point lobe is 80 degrees, the width of a magnetic surface half-power point lobe is 41 degrees, the level of a magnetic surface side lobe is-7.85 dB, and the front-to-back ratio of the magnetic surface is 7.61 dB. This kind of antenna can ultra wide band work and stable radiation, can cover ultra wide band communication frequency channel completely, and the radiation directionality is better, and electric face directional diagram and magnetic face directional diagram all have less zero power point lobe width and half-power point lobe width, lower minor lobe level, higher front-to-back ratio, and the antenna size is less, can be conformal with the location beacon, has better application prospect in the indoor ultra wide band positioning system that will popularize promptly.
Claims (10)
1. Fractal monopole array ultra wide band positioning beacon antenna structure, its characterized in that: the antenna comprises a substrate, a fractal monopole radiation patch array attached to the front surface of the substrate, an antenna ground plate attached to the back surface of the substrate and a gradient structure reflecting plate positioned below the substrate; the fractal monopole radiation patch array comprises a plurality of fractal monopole radiation patches; the fractal monopole radiation patch comprises a feeder line and a corner cut fractal patch connected with the feeder line; a gradual change structure reflection unit corresponding to the radiation patch is arranged at the gradual change structure reflection plate below each angle-cutting fractal patch; the gradient structure reflection unit comprises a metal annular part at the periphery, a middle semiconductor annular part and a central insulation part; the insulating part is formed by arranging a plurality of sheet-shaped pieces with gradually changed dielectric constants in a rectangular manner; in the same gradient structure reflection unit, the relative dielectric constant of each sheet-shaped piece is gradually changed according to the arrangement sequence.
2. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 1, wherein: the overlooking direction of the corner cut fractal patch is a face fractal iteration structure, and the zeroth-order structure of the face fractal iteration structure is a square;
the first-order structure of the face fractal iteration structure is a structure which is obtained by chamfering a zero-order structure and consists of 4 right-angled triangles and 12 small squares; the corner cutting treatment is to divide a square in an original iterative structure into sixteen smaller squares, and then to cut the squares positioned at the corners of the iterative structure in the divided small squares, wherein the cutting treatment is to cut half of the squares along the diagonal lines of the squares;
the second-order structure of the face fractal iteration structure is obtained by subjecting cubes in the first-order structure to corner cutting treatment again; the higher-order structure of the face fractal iteration structure is obtained by chamfering the square in the last order.
3. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 2, wherein: the order of the face type fractal iteration structure of the corner cut fractal patch is not lower than the second order; the metal annular part of the gradient structure reflection unit is formed by gold, silver or copper; the semiconductor annular part of the gradient structure reflection unit is molded by monocrystalline silicon material.
4. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 3, wherein: the order of the face type fractal iteration structure of the corner cut fractal patch is second order; the sheet-shaped piece in the center of the reflection unit with the gradual change structure is a ceramic piece;
the insulation part in the center of the gradient structure reflection unit is divided into 6 rows and 6 columns of 36 ceramic sheets with the same size, the relative dielectric constant of each ceramic sheet gradually changes from top to bottom and from left to right, and the relative dielectric constant difference of two adjacent ceramic sheets is 1.
5. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 4, wherein: a plurality of fractal monopole radiation patches in the fractal monopole radiation patch array are linearly arranged; the number of the fractal monopole radiation patches and the number of the gradient structure reflection units are three;
at the position of the gradient structure reflecting plate, in the insulating part of the left gradient structure reflecting unit, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left part is 10 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right part is 20 +/-0.1; in the insulating part of the middle gradient structure reflecting unit, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left part is 12 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right part is 22 +/-0.1; in the insulating part of the reflecting unit with the gradual change structure on the right side, the relative dielectric constant value of the ceramic wafer with the minimum relative dielectric constant at the upper left side is 14 +/-0.1, and the relative dielectric constant value of the ceramic wafer with the maximum relative dielectric constant at the lower right side is 24 +/-0.1;
and the feeder line of each fractal monopole radiation patch is connected with the antenna feed point below the fractal monopole radiation patch.
6. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 3, wherein: the gradient structure reflection unit is a periodic distribution structure of a semiconductor layer and an insulator layer in a metal conductor layer, and the periodic distribution structure is a photonic crystal structure capable of generating a photonic band gap to prevent electromagnetic waves with preset frequency from propagating.
7. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 3, wherein: the radiation patch is formed by copper, silver, gold or aluminum; the antenna ground plate is formed of copper, silver, gold, or aluminum.
8. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 3, wherein: the antenna grounding plate is of a full-conductive grounding structure, and the relative dielectric constant of the substrate is 6.0-7.0.
9. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 3, wherein: the substrate is a low-loss epoxy resin glass cloth substrate, the substrate is rectangular, the size of the substrate is 45mm +/-1 mm multiplied by 15mm +/-1 mm, and the thickness of the substrate is 1mm +/-0.1 mm;
the size of the gradually-changed structure reflecting plate is 45mm +/-1 mm multiplied by 15mm +/-1 mm, the thickness of the gradually-changed structure reflecting plate is 1mm +/-0.1 mm, and the gradually-changed structure reflecting plate comprises 3 gradually-changed structure reflecting units which are linearly arranged; the outermost ring of each gradient structure reflection unit is an outer ring formed by copper or silver or gold, and the outer ring is a square ring conductor layer with the side length of 15mm +/-0.1 mm and the inner ring with the side length of 12 mm +/-0.1 mm; the middle ring of each gradient structure reflection unit is a square ring semiconductor layer which is formed by monocrystalline silicon material and has the outer edge length of 12 mm +/-0.1 mm and the inner edge length of 9 mm +/-0.1 mm; the center of each gradient structure reflection unit is a square insulator layer with the side length of 9 mm +/-0.1 mm, which is formed by ceramic materials with gradient dielectric constants;
the size of the fractal monopole radiation patch array is 45mm +/-1 mm multiplied by 15mm +/-1 mm; the fractal monopole radiation patch consists of a feeder line with the size of 5mm +/-1 mm multiplied by 1mm +/-0.1 mm and a corner cut fractal patch with the size of 8mm +/-1 mm multiplied by 8mm +/-1 mm.
10. The fractal monopole sub-array ultra-wideband positioning beacon antenna structure of claim 3, wherein: the working frequency band range of the antenna is 2.178-11.402 GHz.
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| CN110690567A (en) * | 2019-11-18 | 2020-01-14 | 厦门大学嘉庚学院 | Fractal monopole array ultra-wideband positioning beacon antenna |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110690567A (en) * | 2019-11-18 | 2020-01-14 | 厦门大学嘉庚学院 | Fractal monopole array ultra-wideband positioning beacon antenna |
| CN110690567B (en) * | 2019-11-18 | 2024-04-05 | 厦门大学嘉庚学院 | Fractal monopole array ultra-wideband positioning beacon antenna |
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