CN107482310B - Directional diagram electric tuning linear polarization dipole antenna - Google Patents
Directional diagram electric tuning linear polarization dipole antenna Download PDFInfo
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- CN107482310B CN107482310B CN201710725239.9A CN201710725239A CN107482310B CN 107482310 B CN107482310 B CN 107482310B CN 201710725239 A CN201710725239 A CN 201710725239A CN 107482310 B CN107482310 B CN 107482310B
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- 230000010287 polarization Effects 0.000 title claims abstract description 13
- 238000010586 diagram Methods 0.000 title abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 395
- 229910052751 metal Inorganic materials 0.000 claims abstract description 395
- 239000003990 capacitor Substances 0.000 claims abstract description 73
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 239000000523 sample Substances 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 35
- 238000004891 communication Methods 0.000 abstract description 14
- XOMKZKJEJBZBJJ-UHFFFAOYSA-N 1,2-dichloro-3-phenylbenzene Chemical compound ClC1=CC=CC(C=2C=CC=CC=2)=C1Cl XOMKZKJEJBZBJJ-UHFFFAOYSA-N 0.000 description 18
- 230000000191 radiation effect Effects 0.000 description 12
- 238000004088 simulation Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 230000003071 parasitic effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000001149 cognitive effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
- H01Q3/247—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching by switching different parts of a primary active element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
Abstract
The invention discloses a directional diagram electric tuning linear polarization dipole antenna, which comprises four antenna units, a square PCB (printed circuit board), a feed port, a metal grounding plate, a dielectric plate and an isolation capacitor, wherein the square PCB is arranged on the antenna unit; the dielectric plate is composed of four dielectric sheets, four antenna units are respectively positioned on four end faces of the PCB, each antenna unit comprises 6 metal sheets, the structures are identical, and the antenna units are distributed in a central symmetry mode. The directional diagram electric tuning linear polarization dipole antenna has the advantages of simple structure, low loss, wide bandwidth, high gain, high radiation efficiency, convenient switching among four radiation directions and the like, and is very suitable for a modern wireless communication system.
Description
[ technical field ]
The invention relates to a microwave passive device, in particular to a directional diagram electric tuning linear polarization dipole antenna.
[ background Art ]
With the rapid development of wireless communication, antennas are an important component of a communication system, and the performance of the antennas determines whether the system can work normally or not and whether various functions can operate smoothly or not. In recent years, with the development of various mobile communication applications such as GSM and 3G, LTE, wiFi, WLAN, wiMAX, antennas on devices are required to have a powerful information transmitting and receiving function. Under the condition of limited frequency spectrum resources, the high-speed and high-capacity information transmission and the multi-service cooperative cooperation of the equipment are realized; on the other hand, due to the rapid development of modern high-capacity and multifunctional integrated wireless communication systems, the number of communication subsystems carried on the same communication platform is increased, so that the number of antennas required on the platform is also required to be increased correspondingly. This phenomenon is very disadvantageous in terms of cost reduction, weight reduction, realization of good electromagnetic compatibility characteristics, and the like. Will become a bottleneck limiting the further development and application of the wireless integrated system.
Many wireless communication applications place higher demands on beam direction adjustability or beam direction reconfigurability, such as cellular base stations, car-to-car communications, remote sensing, satellite communications, and cognitive radio, among others. Conventional designs are mostly based on phased array antennas and can provide wide beam switching angles and high radiation directivity. They are structurally bulky and require complex feed networks and high costs.
Therefore, designing an antenna that meets various system requirements and adapts to complex and changeable application environments is a key for the continuous development of modern communication.
In the presently disclosed literature, pattern reconfigurable antenna types mainly include a reflective surface antenna and a parasitic array diffuser controlled with an electronically controlled switch. However, (1) variable reflection phase and adjustable beam direction are achieved by adding a switch on the reflecting surface of the reflecting surface antenna. But the scanning angle of the device is smaller than 60 degrees, and the requirements of broadband wireless communication in the daily and monthly conditions cannot be met; (2) By means of mutual coupling between different radiating elements, the intermediate main radiating antenna couples energy to surrounding parasitic elements, which can be phase shifted by the varactors loaded on the parasitic elements, and such a phase difference relationship between the main antenna and the parasitic elements can produce a beam scanning effect. Although the method can achieve a large-range sweep angle, the ESPAR antenna has a narrow frequency band range of only 15 percent. (3) Other designs are based on single-arm helical antennas, quasi-yagi antennas, or SIW horn antennas, which also achieve beam reconfigurability. But the radiation patterns of these antennas are not ideal, the beam sweep range is narrow and the volume is large. The various drawbacks described above limit the application of these pattern reconfigurable antennas in modern wireless communication systems.
[ summary of the invention ]
The invention aims to solve the technical problem of providing a linear polarization dipole antenna with simple structure, low loss and reconfigurable directional diagram.
In order to solve the technical problems, the invention adopts the technical scheme that the directional diagram electrically-tunable linearly-polarized dipole antenna comprises a first antenna unit 1, a second antenna unit 2, a third antenna unit 3, a fourth antenna unit 4, a square PCB (printed circuit board) 5, a feed port 6, a metal grounding plate, a dielectric plate and an isolation capacitor; the dielectric plate consists of four dielectric sheets 81, 82, 83 and 84, and four antenna units 1,2,3 and 4 are respectively positioned on four end faces of the PCB 5, have the same structure and are distributed in a central symmetry manner; the first antenna element 1 comprises a metal sheet 11, a metal sheet 12, a metal sheet 13, a metal sheet 14, a metal sheet 15, and a metal sheet 16; the second antenna element 2 comprises a metal sheet 21, a metal sheet 22, a metal sheet 23, a metal sheet 24, a metal sheet 25, and a metal sheet 26; the third antenna element 3 comprises a metal sheet 31, a metal sheet 32, a metal sheet 33, a metal sheet 34, a metal sheet 35, a metal sheet 36; the fourth antenna element 4 comprises a metal sheet 41, a metal sheet 42, a metal sheet 43, a metal sheet 44, a metal sheet 45, a metal sheet 46.
Further, the feeding mode adopts a probe feeding mode which is arranged at the center of the square PCB.
Further, the four dielectric sheets 81, 82, 83, 84 are respectively located at four end faces of the square PCB 5 and cover the four end faces of the square PCB 5, and the square PCB 5 is respectively connected with a metal grounding plate 71, 72 at front and back, and the size of the metal grounding plate is the same as that of the side face of the square PCB 5.
Further, the center feed port 6 includes a metal cylinder 61 and a metal cylinder 62, the metal cylinder 61 is connected to the front surface floor 71 of the square PCB 5, and the metal cylinder 62 is connected to the rear surface floor 72 of the square PCB 5. The two metal cylinders 61 and 62 are connected back and forth and arranged in a step shape, and the central axes of the cylinders are coincident with the central axis of the square PCB 5.
Further, the metal sheets 11, 12 are parallel to the dielectric sheet 81, perpendicular to the metal grounding plate 7172, symmetrically placed along the 1 st central axis, and the metal sheet 11 is perpendicularly connected to the metal grounding plate 71, and the metal sheet 12 is perpendicularly connected to the metal grounding plate 72. The metal sheet 13 is vertically connected with the metal sheet 11, and the metal sheet 14 is vertically connected with the metal sheet 12 and symmetrically arranged along the 1 st central axis. The metal sheet 15 is vertically connected with the metal sheet 13, and the metal sheet 16 is vertically connected with the metal sheet 14 and symmetrically arranged along the 1 st central axis.
Further, the metal sheets 21, 22 are parallel to the dielectric sheet 82, perpendicular to the metal grounding plate 7172, symmetrically disposed along the 2 nd central axis, and the metal sheet 21 is perpendicularly connected to the metal grounding plate 71, and the metal sheet 22 is perpendicularly connected to the metal grounding plate 72. The metal sheet 23 is vertically connected with the metal sheet 21, and the metal sheet 24 is vertically connected with the metal sheet 22 and symmetrically arranged along the central axis 2. The metal sheet 25 is vertically connected with the metal sheet 23, and the metal sheet 26 is vertically connected with the metal sheet 24 and symmetrically arranged along the central axis 2.
Further, the metal sheets 31, 32 are parallel to the dielectric sheet 83, perpendicular to the metal grounding plate 7172, symmetrically disposed along the 1 st central axis, and the metal sheet 31 is perpendicularly connected to the metal grounding plate 71, and the metal sheet 32 is perpendicularly connected to the metal grounding plate 72. The metal sheet 33 is vertically connected with the metal sheet 31, the metal sheet 34 is vertically connected with the metal sheet 32, and the metal sheets are symmetrically arranged along the 1 st central axis. The metal sheet 35 is vertically connected with the metal sheet 33, and the metal sheet 36 is vertically connected with the metal sheet 34 and symmetrically arranged along the 1 st central axis.
Further, the metal sheets 41 and 42 are parallel to the dielectric sheet 84, perpendicular to the metal grounding plate 7172, symmetrically disposed along the 2 nd central axis, and the metal sheet 41 is perpendicularly connected to the metal grounding plate 71, and the metal sheet 42 is perpendicularly connected to the metal grounding plate 72. The metal sheet 43 is vertically connected with the metal sheet 41, and the metal sheet 44 is vertically connected with the metal sheet 42 and symmetrically arranged along the 2 nd central axis. The metal sheet 45 is vertically connected with the metal sheet 43, and the metal sheet 46 is vertically connected with the metal sheet 44 and symmetrically arranged along the central axis 2.
Further, the four square patches 17, 18, 19, 110 are respectively located on the medium sheet 81, and uniformly divide the medium sheet 81 into five parts; the slits between square patches 17 are connected by an electric control switch 111, the slits between square patches 18 are connected by an electric control switch 112, the slits between square patches 19 are connected by an electric control switch 113, and the slits between square patches 110 are connected by an electric control switch 114.
Further, four pair of square patches 27, 28, 29, 210 are respectively located on the medium sheet 82, dividing the medium sheet 82 into five parts uniformly; the slits between square patches 27 are connected by an electric control switch 211, the slits between square patches 28 are connected by an electric control switch 212, the slits between square patches 29 are connected by an electric control switch 213, and the slits between square patches 210 are connected by an electric control switch 214.
Further, four pair of square patches 37, 38, 39, 310 are respectively located on the medium sheet 83, dividing the medium sheet 83 into five parts uniformly; the slits between square patches 37 are connected by an electric control switch 311, the slits between square patches 38 are connected by an electric control switch 312, the slits between square patches 39 are connected by an electric control switch 313, and the slits between square patches 310 are connected by an electric control switch 314.
Further, four pairs of square patches 47, 48, 49, 410 are respectively located on the medium sheet 84, uniformly dividing the medium sheet 84 into five parts; the slits between square patches 47 are connected by an electric control switch 411, the slits between square patches 48 are connected by an electric control switch 412, the slits between square patches 49 are connected by an electric control switch 413, and the slits between square patches 410 are connected by an electric control switch 414.
Further, the cathodes of all the electric control switches are connected with square patches in the-y axis direction, and the square patches in the-y axis direction are connected with the cathodes of a direct current power supply through direct current wires to provide 0V voltage for the cathodes of all the electric control switches; the anodes of the capacitors are connected with square patches in the +y axis direction, and the square patches in the +y axis direction are connected with the positive electrode of a direct current power supply through a direct current feeder line to provide 3V voltage for the anodes of all the electric control switches.
Further, the four electric control switches of the first antenna unit 1 are simultaneously controlled by a direct current power supply, the four electric control switches of the second antenna unit 2 are simultaneously controlled by a direct current power supply, the four electric control switches of the third antenna unit 3 are simultaneously controlled by a direct current power supply, and the four electric control switches of the fourth antenna unit 4 are simultaneously controlled by a direct current power supply.
Further, 28 capacitors are connected with the back of the square PCB board through direct current cables, and the capacitors are used for isolating the direct current capacitors and improving the on-off independence of the electric control switches of the four antenna units.
Further, the electric control switch is a diode, the cathode of the diode is connected with the square patch in the +y direction, and the cathode of the diode is connected with the square patch in the-y direction.
Further, when the anodes of the electric control switches of the antenna units 1,2,3 and 4 are connected with 3V direct-current voltage through the direct-current feeder lines, the antenna units are in a total reflection state; when the electric control switch of the antenna unit 1 is turned off and the electric control switches of the direct current antenna units 2,3 and 4 are turned on, the antenna unit 1 has a radiation effect to form +z-axis directional radiation; when the electric control switches of the antenna units 2 are turned off and the electric control switches of the antenna units 1, 3 and 4 are turned on, the antenna unit 2 has a radiation effect to form-x axis directional radiation; when the electric control switches of the antenna units 3 are turned off and the electric control switches of the antenna units 1,2 and 4 are turned on, the antenna unit 3 has a radiation effect to form-z axis directional radiation; when the electric control switch of the antenna unit 4 is turned off and the electric control switches of the antenna units 1,2 and 3 are turned on, the antenna unit 4 has a radiation effect to form +x-axis directional radiation. Therefore, the electric tuning characteristic of the directional diagram can be realized by independently controlling the on-off of the electric control switch.
The directional diagram electric tuning linear polarization dipole antenna has the advantages of simple structure, low loss, wide bandwidth, high gain, high radiation efficiency, convenient switching among four radiation directions and the like, and is very suitable for a modern wireless communication system.
[ description of the drawings ]
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a perspective view of a pattern electrically tunable linearly polarized dipole antenna according to an embodiment of the present invention.
Fig. 2 is a front view, a left view, a top view, a right view, a bottom view, and a cross-sectional view of a pattern electrically tunable linearly polarized dipole antenna according to an embodiment of the present invention, (a) is a front view, (b) is a left view, (c) is a top view, (d) is a right view, (e) is a bottom view, (f) is a rear view, and (g) is a cross-sectional view taken from a bottom surface.
Fig. 3 is a dimensional diagram of a pattern electrically tunable linearly polarized dipole antenna according to an embodiment of the present invention.
FIG. 4 is a diagram of an embodiment of an electrically tunable linearly polarized dipole antenna S according to the present invention 11 Parameter simulation and test patterns and gain simulation and test patterns.
Fig. 5 is a graph of the radiation efficiency of an embodiment of the present invention for a pattern electrically tunable linearly polarized dipole antenna.
Fig. 6 is a radiation pattern of an electrically tunable linearly polarized dipole antenna according to an embodiment of the present invention at 1.9GHz and 2.5 GHz.
Fig. 7 is a diagram of an embodiment of the present invention of a pattern electrically tunable linearly polarized dipole antenna when the antenna is radiating from different antenna elements.
Detailed description of the preferred embodiments
The invention discloses a directional pattern electric tuning linear polarization dipole antenna which comprises a first antenna unit, a second antenna unit, a third antenna unit, a fourth antenna unit, a square PCB (printed circuit board), a feed port, two metal grounding plates, a thin dielectric plate and an isolation capacitor, wherein 4 antenna units are distributed on four end faces of the PCB in a central symmetry manner. The antenna unit comprises a direct current feeder, square patches, an electric control switch and a broadband dipole, wherein the square patches are metal copper etched on the surface of a thin dielectric plate on the peripheral end face of the PCB.
The first antenna unit is provided with 6 metal sheets, and the long sides of the metal sheets are parallel to the first central axis. The metal sheet 11 is vertically placed on the front metal floor, the metal sheet 12 is vertically placed on the rear metal floor, and the metal sheets 11, 12 are axisymmetrically arranged about the 1 st central axis. The metal sheet 13 is vertically connected with the metal sheet 11, the short side is vertically connected with the metal sheet 12 along the +z axis direction, the short side is vertically connected with the metal sheet 14, and the metal sheet 13 and the metal sheet 14 are axially symmetrically arranged about the 1 st central axis. The metal sheet 15 is vertically connected with the metal sheet 13, the short side is vertically connected with the metal sheet 14, the short side is vertically connected with the metal sheet 16, the short side is arranged along the +y direction, and the metal sheet 15 and the metal sheet 16 are axisymmetrically arranged about the 1 st central axis.
The second antenna unit is provided with 6 metal sheets, and the long sides of the metal sheets are parallel to the 2 nd central axis. The metal sheet 21 is vertically placed on the front metal floor, the metal sheet 22 is vertically placed on the rear metal floor, and the metal sheets 21, 22 are axially symmetrically arranged with respect to the 2 nd central axis. The metal sheet 23 is vertically connected with the metal sheet 21, the short side is vertically connected with the metal sheet 22, the short side is vertically connected with the metal sheet 24, the metal sheet 23 and the metal sheet 24 are axially symmetrically arranged about the 2 nd central axis. The metal sheet 25 is vertically connected with the metal sheet 23, the short side is vertically connected with the metal sheet 24, the short side is vertically connected with the metal sheet 26, the short side is arranged along the +y direction, and the metal sheet 25 and the metal sheet 26 are axisymmetrically arranged about the 2 nd central axis.
The third antenna unit is provided with 6 metal sheets, and the long sides of the metal sheets are parallel to the 1 st central axis. The metal sheet 31 is vertically placed on the front metal floor, the metal sheet 32 is vertically placed on the rear metal floor, and the metal sheets 31, 32 are axisymmetrically arranged with respect to the 1 st central axis. The metal sheet 33 is vertically connected with the metal sheet 31, the short side is vertically connected with the metal sheet 32, the short side is vertically connected with the metal sheet 34, the short side is axially symmetrical to the metal sheet 33 and the metal sheet 34 with respect to the 1 st central axis. The metal sheet 35 is vertically connected with the metal sheet 33, the short side is vertically connected with the metal sheet 36 along the-y direction, the short side is vertically connected with the metal sheet 34, the metal sheet 35 and the metal sheet 36 are axially symmetrically arranged relative to the 1 st central axis.
The fourth antenna unit is provided with 6 metal sheets, and the long sides of the metal sheets are parallel to the 2 nd central axis. The metal sheet 41 is vertically placed on the front metal floor, the metal sheet 42 is vertically placed on the rear metal floor, and the metal sheets 41, 42 are axially symmetrically arranged about the 2 nd central axis. The metal sheet 43 is vertically connected with the metal sheet 41, the short side is vertically connected with the metal sheet 42 along the +x axis direction, the short side is vertically connected with the metal sheet 44, and the metal sheet 43 and the metal sheet 44 are axially symmetrically arranged about the 2 nd central axis. The metal sheet 45 is vertically connected with the metal sheet 43, the short side is vertically connected with the metal sheet 44, the short side is vertically connected with the metal sheet 46, the short side is arranged along the +y direction, and the metal sheet 45 and the metal sheet 46 are axisymmetrically arranged about the 2 nd central axis.
The central feed port comprises a smaller metal cylinder and a larger metal cylinder, the smaller metal cylinder is connected with the surface floor of the front surface of the square PCB, and the larger metal cylinder is connected with the surface floor of the rear surface of the square PCB. The two metal cylinders are connected with each other in front and back and are arranged in a step shape, and the central axes of the cylinders are coincident with the central axis of the square PCB.
Each end face thin dielectric plate of the square PCB is respectively etched with 8 square patches, every two square patches form a group, and gaps between the square patches and the square patches are connected through an electric control switch. The end face is divided into 5 parts uniformly by 4 groups of square patches on each end face of the PCB, the electric control switch is a diode, the anode of the diode is connected with the square patches along the +y axis, and the cathode of the diode is connected with the square patches along the-y axis.
The cathodes of all the electric control switches are connected with square patches in the-y axis direction, and the square patches in the-y axis direction are connected with the cathodes of a direct current power supply through direct current wires to provide 0V voltage for the cathodes of all the electric control switches; the anodes of the capacitors are connected with square patches in the +y axis direction, and the square patches in the +y axis direction are connected with the positive electrode of a direct current power supply to provide 3V voltage for the anodes of all the electric control switches.
The electric control switches of the first antenna unit are controlled by a group of direct current power supplies, the electric control switches of the second antenna unit are controlled by a group of direct current power supplies, the electric control switches of the third antenna unit are controlled by a group of switches, and the electric control switches of the fourth antenna unit are controlled by a group of electric control switches.
In addition, 28 capacitors are connected with the back of the square PCB board through direct current cables, and the capacitors are used for isolating the direct current capacitors and improving the on-off independence of the electric control switches of the four antenna units.
When the electric control switch of each antenna unit is switched on, each antenna unit is in a total reflection state; when the electric control switches of the first antenna unit are turned off and the electric control switches of the second antenna unit, the third antenna unit and the fourth antenna unit are turned on, the first antenna unit has a radiation effect to form +z-axis directional radiation; when the electric control switches of the first antenna unit, the third antenna unit and the fourth antenna unit are on, the second antenna unit has a radiation effect to form-x axis directional radiation; when the electric control switches of the first antenna unit, the second antenna unit and the fourth antenna unit are on, the third antenna unit has a radiation effect to form-z axis directional radiation; the electric control switch of the fourth antenna unit is in off state, and when the electric control switches of the first antenna unit, the second antenna unit and the third antenna unit are in on state, the fourth antenna unit has a radiation effect to form +x-axis directional radiation; the electric control switch of each antenna unit is controlled to be on-off respectively, so that the electric adjustment characteristic of the directional diagram is realized.
As shown in fig. 1 and 2, the pattern electrically tunable linear dipole antenna according to the embodiment of the present invention includes a first antenna unit 1, a metal sheet 11, a metal sheet 12, a metal sheet 13, a metal sheet 14, a metal sheet 15, a metal sheet 16, a square patch 17, a square patch 18, a square patch 19, a square patch 110, an electric control switch 111, an electric control switch 112, an electric control switch 113, and an electric control switch 114; a second antenna unit 2, a metal sheet 21, a metal sheet 22, a metal sheet 23, a metal sheet 24, a metal sheet 25, a metal sheet 26, a square patch 27, a square patch 28, a square patch 29, a square patch 210, an electric control switch 211, an electric control switch 212, an electric control switch 213, and an electric control switch 214; the third antenna unit 3, metal sheet 31, metal sheet 32, metal sheet 33, metal sheet 34, metal sheet 35, metal sheet 36, square patch 37, square patch 38, square patch 39, square patch 310, electric control switch 311, electric control switch 312, electric control switch 313, electric control switch 314; the fourth antenna element 4 is a metal sheet 41, a metal sheet 42, a metal sheet 43, a metal sheet 44, a metal sheet 45, a metal sheet 46, a square patch 47, a square patch 48, a square patch 49, a square patch 410, an electric control switch 411, an electric control switch 412, an electric control switch 413, and an electric control switch 414. Square PCB 5, center feed port 6, small metal cylinder 61, large metal cylinder 62, metal ground plate 71, metal ground plate 72, thin dielectric sheet 81, thin dielectric sheet 82, thin dielectric sheet 83, thin dielectric sheet 84. Capacitor 91, capacitor 92, capacitor 93, capacitor 94, capacitor 95, capacitor 96, capacitor 97, capacitor 98, capacitor 99, capacitor 910, capacitor 911, capacitor 912, capacitor 913, capacitor 914, capacitor 915, capacitor 916, capacitor 917, capacitor 918, capacitor 919, capacitor 920, capacitor 921, capacitor 922, capacitor 923, capacitor 924, capacitor 925, capacitor 926, capacitor 927, capacitor 928.
The square patch 17, the square patch 18, the square patch 19, the square patch 110, the electric control switch 111, the electric control switch 112, the electric control switch 113 and the electric control switch 114 are positioned on the surface of the thin dielectric sheet 81; square patch 27, square patch 28, square patch 29, square patch 210, electronically controlled switch 211, electronically controlled switch 212, electronically controlled switch 213, electronically controlled switch 214 are located on the surface of thin dielectric sheet 82; square patch 37, square patch 38, square patch 39, square patch 310, electric control switch 311, electric control switch 312, electric control switch 313, electric control switch 314 are positioned on the surface of thin dielectric sheet 83; square patches 47, square patches 48, square patches 49, square patches 410, electronically controlled switches 411, 412, 413, 414 are located on the surface of sheet 84.
The capacitor 91, the capacitor 92, the capacitor 93, the capacitor 94, the capacitor 95, the capacitor 96, the capacitor 97, the capacitor 98, the capacitor 99, the capacitor 910, the capacitor 911, the capacitor 912, the capacitor 913, the capacitor 914, the capacitor 915, the capacitor 916, the capacitor 917, the capacitor 918, the capacitor 919, the capacitor 920, the capacitor 921, the capacitor 922, the capacitor 923, the capacitor 924, the capacitor 925, the capacitor 926, the capacitor 927 and the capacitor 928 are positioned in the groove etched on the surface of the metal grounding plate 72.
The central feed port 6 is located at the center of the square PCB 5 and consists of a smaller metal cylinder 61 and a larger metal cylinder 62, the smaller metal cylinder 61 is connected with the front surface floor 71 of the square PCB 5, and the larger metal cylinder 62 is connected with the rear surface floor 72 of the square PCB 5. The two metal cylinders 61 and 62 are connected back and forth in a stepped arrangement. The center line of the upper and lower bottom surfaces of the metal cylinder 61 passes through the intersection of the diagonal lines of the square PCB 5, and the center line of the upper and lower bottom surfaces of the metal cylinder 62 passes through the intersection of the diagonal lines of the square PCB 5, and the center line of the upper and lower bottom surfaces of the metal cylinder 61 coincides with the center line of the upper and lower bottom surfaces of the metal cylinder 62.
The embodiment of the invention relates to a directional diagram electrically-tunable linearly-polarized dipole antenna, and the square PCB 5 and the thin dielectric substrates 81, 82, 83 and 84 are substrates of a printed circuit board, wherein the relative dielectric constant of the square PCB 5 is 2.33, the thickness is 3.962mm, and the relative dielectric constant of the thin dielectric substrates 81, 82, 83 and 84 is 3, and the thickness is 0.13mm.
In the embodiment of the invention, the metal sheet 11 of the first antenna unit is vertically arranged on the front metal floor, the metal sheet 12 is vertically arranged on the rear metal floor, and the metal sheets 11 and 12 are axisymmetrically arranged about the 1 st central axis. The metal sheet 13 is vertically connected with the metal sheet 11, the short side is vertically connected with the metal sheet 12 along the +z axis direction, the short side is vertically connected with the metal sheet 14, and the metal sheet 13 and the metal sheet 14 are axially symmetrically arranged about the 1 st central axis. The metal sheet 15 is vertically connected with the metal sheet 13, the short side is vertically connected with the metal sheet 14, the short side is vertically connected with the metal sheet 16, the short side is arranged along the +y direction, and the metal sheet 15 and the metal sheet 16 are axisymmetrically arranged about the 1 st central axis.
The antenna comprises a dielectric sheet 81, a first antenna unit, a second antenna unit, a third antenna unit, a fourth antenna unit and a fourth antenna unit, wherein the fourth antenna unit and the third antenna unit are respectively arranged on the dielectric sheet 81; the slits between square patches 17 are connected by an electric control switch 111, the slits between square patches 18 are connected by an electric control switch 112, the slits between square patches 19 are connected by an electric control switch 113, and the slits between square patches 110 are connected by an electric control switch 114.
In the embodiment of the invention, the metal sheet 21 of the second antenna unit is vertically arranged on the front metal floor, the metal sheet 22 is vertically arranged on the rear metal floor, and the metal sheets 21 and 22 are axially symmetrically arranged relative to the 2 nd central axis. The metal sheet 23 is vertically connected with the metal sheet 21, the short side is vertically connected with the metal sheet 22, the short side is vertically connected with the metal sheet 24, the metal sheet 23 and the metal sheet 24 are axially symmetrically arranged about the 2 nd central axis. The metal sheet 25 is vertically connected with the metal sheet 23, the short side is vertically connected with the metal sheet 24, the short side is vertically connected with the metal sheet 26, the short side is arranged along the +y direction, and the metal sheet 25 and the metal sheet 26 are axisymmetrically arranged about the 2 nd central axis.
In the embodiment of the invention, the pattern electrically-tunable linear polarized dipole antenna, the fourth pair of square patches 27, 28, 29 and 210 of the second antenna unit are respectively positioned on the dielectric sheet 82, and the dielectric sheet 82 is uniformly divided into five parts; the slits between square patches 27 are connected by an electric control switch 211, the slits between square patches 28 are connected by an electric control switch 212, the slits between square patches 29 are connected by an electric control switch 213, and the slits between square patches 210 are connected by an electric control switch 214.
In the embodiment of the invention, the metal sheet 31 of the third antenna unit is vertically arranged on the front metal floor, the metal sheet 32 is vertically arranged on the rear metal floor, and the metal sheets 31 and 32 are axisymmetrically arranged relative to the 1 st central axis. The metal sheet 33 is vertically connected with the metal sheet 31, the short side is vertically connected with the metal sheet 32, the short side is vertically connected with the metal sheet 34, the short side is axially symmetrical to the metal sheet 33 and the metal sheet 34 with respect to the 1 st central axis. The metal sheet 35 is vertically connected with the metal sheet 33, the short side is vertically connected with the metal sheet 36 along the-y direction, the short side is vertically connected with the metal sheet 34, the metal sheet 35 and the metal sheet 36 are axially symmetrically arranged relative to the 1 st central axis.
In the embodiment of the invention, the pattern electrically-tuned linear polarized dipole antenna, the fourth pair of square patches 37, 38, 39 and 310 of the third antenna unit are respectively positioned on the dielectric sheet 83, and the dielectric sheet 83 is uniformly divided into five parts; the slits between square patches 37 are connected by an electric control switch 311, the slits between square patches 38 are connected by an electric control switch 312, the slits between square patches 39 are connected by an electric control switch 313, and the slits between square patches 310 are connected by an electric control switch 314.
In the embodiment of the invention, the metal sheet 41 of the fourth antenna unit is vertically arranged on the front metal floor, the metal sheet 42 is vertically arranged on the rear metal floor, and the metal sheets 41 and 42 are axially symmetrically arranged about the 2 nd central axis. The metal sheet 43 is vertically connected with the metal sheet 41, the short side is vertically connected with the metal sheet 42 along the +x axis direction, the short side is vertically connected with the metal sheet 44, and the metal sheet 43 and the metal sheet 44 are axially symmetrically arranged about the 2 nd central axis. The metal sheet 45 is vertically connected with the metal sheet 43, the short side is vertically connected with the metal sheet 44, the short side is vertically connected with the metal sheet 46, the short side is arranged along the +y direction, and the metal sheet 45 and the metal sheet 46 are axisymmetrically arranged about the 2 nd central axis.
In the embodiment of the invention, the fourth pair of square patches 47, 48, 49 and 410 of the fourth antenna unit are respectively positioned on the dielectric sheet 84, and the dielectric sheet 84 is uniformly divided into five parts; the slits between square patches 47 are connected by an electric control switch 411, the slits between square patches 48 are connected by an electric control switch 412, the slits between square patches 49 are connected by an electric control switch 413, and the slits between square patches 410 are connected by an electric control switch 414.
The directional diagram electric tuning linear polarization dipole antenna of the embodiment of the invention comprises an electric control switch 111, an electric control switch 112, an electric control switch 113, an electric control switch 114, an electric control switch 211, an electric control switch 212, an electric control switch 213, an electric control switch 214, an electric control switch 311, an electric control switch 312, an electric control switch 313, an electric control switch 314, an electric control switch 411, an electric control switch 412, an electric control switch 413 and a negative electrode of the electric control switch 414, wherein the negative electrodes of the electric control switch 111, the electric control switch 112, the electric control switch 113 and the electric control switch 414 are all connected with square patches in the-y axis direction, and the square patches in the-y axis direction are connected with the negative electrode of a direct current power supply through direct current wires to provide 0V voltage for the negative electrodes of all the electric control switches; the anodes of the capacitors are connected with square patches in the +y axis direction, and the square patches in the +y axis direction are connected with the positive electrode of a direct current power supply through direct current wires to provide 3V voltage for the anodes of all the electric control switches.
In the embodiment of the invention, the electric control switch of the first antenna unit 1 is controlled by the same direct current power supply, the electric control switch of the second antenna unit 2 is controlled by the same direct current power supply, the electric control switch of the third antenna unit 3 is controlled by the same switch, and the electric control switch of the fourth antenna unit 4 is controlled by the same electric control switch.
The electric control switch is a diode, the cathode of the diode is connected with a square patch in the +y direction, and the cathode of the diode is connected with a square patch in the-y direction.
According to the directional diagram electrically-tunable linear polarized dipole antenna, the on-off of the four groups of diode electric control switches is controlled through the four groups of voltages respectively, and the structure of the antenna radiating unit is changed, so that the directional diagram electrically-tunable of the antenna is realized. When the electric control switches of the antenna unit 1, the antenna unit 2, the antenna unit 3 and the antenna unit 4 are given with 3V direct current voltage, each antenna unit is in a total reflection state; when the anode direct current wire of the electric control switch of the antenna unit 1 is disconnected and the electric control switches of the antenna unit 2, the antenna unit 3 and the antenna unit 4 are given with 3V direct current voltage, the antenna unit 1 has a radiation effect to form +z-axis directional radiation; when the anode wire of the electric control switch of the antenna unit 2 is disconnected and the electric control switches of the antenna unit 1, the antenna unit 3 and the antenna unit 4 are given with 3V direct current voltage, the antenna unit 2 has a radiation effect to form-x axis directional radiation; when the electric control switches of the antenna unit 3 are turned off and the electric control switches of the antenna unit 1, the antenna unit 2 and the antenna unit 4 are turned on, the antenna unit 3 has a radiation effect to form-z axis directional radiation; when the electric control switches of the antenna unit 4 are turned off and the electric control switches of the antenna unit 1, the antenna unit 2 and the antenna unit 3 are turned on, the antenna unit 4 has a radiation effect to form +x-axis directional radiation; the pattern electric tuning characteristic is realized.
When the direct current power supply supplies a high-level signal (3V voltage), the electric control switch is turned on, and when the direct current power supply supplies a low-level signal (0V voltage), the electric control switch is turned off. The capacitor on the back metal grounding plate is used for isolating direct current and providing independence for the on-off of the four antenna unit electric control switches.
The mode of all the electric control switches of the directional diagram electric tuning linear polarized dipole antenna is a BAR50 diode switch which is adopted by the Ying Fei Ling company, and the on-off of the electric control switches is controlled through high and low levels.
According to the directional diagram electric tuning linear polarization dipole antenna, a feed source signal is accessed through a feed port 6, a square integrated waveguide resonant cavity 5 is excited, and then an antenna radiation unit is excited by coupling through a thin dielectric plate 8 positioned on the end face of the square integrated waveguide resonant cavity 5, so that energy emission is realized.
Embodiments of the present invention will be described in further detail below with reference to detailed examples.
As shown in fig. 3, taking a pattern electrically-tunable linear dipole antenna with a center operating frequency of 2.25GHz as an example, the square PCB 5 and the thin dielectric substrates 81, 82, 83, 84 are substrates of a printed circuit board, wherein the square PCB 5 has a relative dielectric constant of 2.33, a thickness of 3.962mm, a loss tangent of 0.0012, the thin dielectric substrates 81, 82, 83, 84 have a relative dielectric constant of 3, a thickness of 0.13mm, and a loss tangent of 0.0013.
The dimensions of the pattern electrically tunable linearly polarized dipole antenna of this embodiment are as follows:
the pattern electrically tunable linearly polarized dipole antenna of this embodiment is a commercial full wave electromagnetic simulation software HFSS modeling simulation design at Ansys corporation.
Fig. 4 and 5 are graphs showing simulation and actual measurement results of return loss and gain and radiation efficiency of the pattern electrically-tunable linearly-polarized dipole antenna in the present embodiment. As can be seen from the actual measurement results in the figure, the impedance matching bandwidth is about 50% in the frequency band of 1.65GHz-2.75GHz, and is slightly wider than the simulated impedance matching bandwidth of 1.72GHz-2.75 GHz. In the operating band, the simulated gain is about 4.3dBi, while the tested gain varies in the range of 3.8dBi-5.4dBi, the main reasons for the differences between testing and simulation are machining errors and the addition of actual dc cables. As shown in fig. 5, the radiation efficiency of the test is about 80% in the frequency range of the impedance matching. The loss of energy is mainly caused by ohmic losses due to the pin diode. The metal loss is negligible compared to the dielectric loss and the ohmic loss.
The radiation patterns tested and simulated along the +z axis direction at 1.9GHz and 2.5GHz are shown in figure 6, the test and simulation results are well matched, the back lobe radiation gain of the antenna is less than-20 dB, and the cross polarization is low and reaches-12 dB. The errors in testing and simulation are mainly caused by the effect of the actual dc cable. In addition, by controlling different states of the electric control switch, the radiation parameters of the antenna in different beam directions are tested, and the radiation performance of the antenna is found to be very similar in the four radiation directions. Based on the symmetry of the antenna about the xoy plane, we can steer the radiation beam to rotate 90 ° to reach the H-plane of a specific direction. Radiation patterns of the antenna in different radiation directions at 2.5GHz are shown in fig. 7, and it is found that the H-plane pattern of the xoz plane can be obtained by rotating 4 times in xoz plane, each time by 90 °. In addition, as can be seen from fig. 7, the 3dB beam width in any radiation direction is greater than 90 °, so that the pattern in this embodiment of the dipole antenna with electrically tunable linear polarization can switch between these four beam directions, and the radiation pattern can cover the entire xoz plane.
In summary, the directional diagram electrically tunable linear polarization dipole antenna provided by the embodiment of the invention has the advantages of simple structure, low loss, wide bandwidth, high gain, high radiation efficiency, convenience in switching among four radiation directions and the like, and is very suitable for modern wireless communication systems.
Claims (8)
1. The directional pattern electric tuning linear polarization dipole antenna is characterized by comprising a first antenna unit (1), a second antenna unit (2), a third antenna unit (3), a fourth antenna unit (4), a square PCB (5), a feed port (6), a metal grounding plate, a dielectric plate and an isolation capacitor; the dielectric plate consists of four dielectric sheets (81, 82, 83 and 84), and four antenna units (1), (2), (3) and (4) are respectively positioned on four end faces of the PCB (5), have the same structure and are distributed in a central symmetry manner; the first antenna unit (1) comprises a first metal sheet (11), a second metal sheet (12), a third metal sheet (13), a fourth metal sheet (14), a fifth metal sheet (15) and a sixth metal sheet (16); the second antenna unit (2) comprises a seventh metal sheet (21), an eighth metal sheet (22), a ninth metal sheet (23), a tenth metal sheet (24), an eleventh metal sheet (25), and a twelfth metal sheet (26); the third antenna unit (3) comprises a thirteenth metal sheet (31), a fourteenth metal sheet (32), a fifteenth metal sheet (33), a sixteenth metal sheet (34), a seventeenth metal sheet (35), and an eighteenth metal sheet (36); the fourth antenna element (4) comprises a nineteenth metal sheet (41), a twentieth metal sheet (42), a twenty-first metal sheet (43), a twenty-second metal sheet (44), a twenty-third metal sheet (45), and a twenty-fourth metal sheet (46);
the first metal sheet (11) and the second metal sheet (12) are parallel to the first dielectric sheet (81), are perpendicular to the first metal grounding plate (71) and the second metal grounding plate (72), are symmetrically arranged along the 1 st central axis, the first metal sheet (11) is perpendicularly connected with the first metal grounding plate (71), and the second metal sheet (12) is perpendicularly connected with the second metal grounding plate (72); the third metal sheet (13) is vertically connected with the first metal sheet (11), the fourth metal sheet (14) is vertically connected with the second metal sheet (12), and the third metal sheet and the fourth metal sheet are symmetrically arranged along the 1 st central axis; the fifth metal sheet (15) is vertically connected with the third metal sheet (13), the sixth metal sheet (16) is vertically connected with the fourth metal sheet (14), and the fifth metal sheet and the fourth metal sheet are symmetrically arranged along the 1 st central axis; the seventh metal sheet (21) and the eighth metal sheet (22) are parallel to the second dielectric sheet (82), are perpendicular to the first metal grounding plate (71) and the second metal grounding plate (72), are symmetrically arranged along the central axis 2, the seventh metal sheet (21) is perpendicularly connected with the first metal grounding plate (71), and the eighth metal sheet (22) is perpendicularly connected with the second metal grounding plate (72); the ninth metal sheet (23) is vertically connected with the seventh metal sheet (21), the tenth metal sheet (24) is vertically connected with the eighth metal sheet (22), and the ninth metal sheet and the eighth metal sheet are symmetrically arranged along the central axis 2; the eleventh metal sheet (25) is vertically connected with the ninth metal sheet (23), the twelfth metal sheet (26) is vertically connected with the tenth metal sheet (24), and the twelfth metal sheet and the tenth metal sheet are symmetrically arranged along the central axis 2; the thirteenth metal sheet (31) and the fourteenth metal sheet (32) are parallel to the third dielectric sheet (83), are perpendicular to the first metal grounding plate (71) and the second metal grounding plate (72), are symmetrically arranged along the central axis 1, are vertically connected with the first metal grounding plate (71), and are vertically connected with the second metal grounding plate (72); the fifteenth metal sheet (33) is vertically connected with the thirteenth metal sheet (31), the sixteenth metal sheet (34) is vertically connected with the fourteenth metal sheet (32), and the sixteenth metal sheet are symmetrically arranged along the 1 st central axis; the seventeenth metal sheet (35) is vertically connected with the fifteenth metal sheet (33), the eighteenth metal sheet (36) is vertically connected with the sixteenth metal sheet (34), and the seventeenth metal sheet and the sixteenth metal sheet are symmetrically arranged along the central axis 1; the nineteenth metal sheet (41) and the twentieth metal sheet (42) are parallel to the fourth dielectric sheet (84), are perpendicular to the first metal grounding plate (71) and the second metal grounding plate (72), are symmetrically arranged along the central axis of the 2 nd, and the nineteenth metal sheet (41) is perpendicularly connected with the first metal grounding plate (71), and the twentieth metal sheet (42) is perpendicularly connected with the second metal grounding plate (72); the twenty-first metal sheet (43) is vertically connected with the nineteenth metal sheet (41), the twenty-second metal sheet (44) is vertically connected with the twentieth metal sheet (42), and the twenty-second metal sheet and the twentieth metal sheet are symmetrically arranged along the central axis 2; the twenty-third metal sheet (45) is vertically connected with the twenty-first metal sheet (43), the twenty-fourth metal sheet (46) is vertically connected with the twenty-second metal sheet (44), and the twenty-third metal sheet and the twenty-second metal sheet are symmetrically arranged along the central axis 2;
four pairs of square patches are arranged on each dielectric sheet, and slits between each pair of square patches are connected through an electric control switch;
the first dielectric sheet (81), the second dielectric sheet (82), the third dielectric sheet (83) and the fourth dielectric sheet (84) are respectively located at four end faces of the square PCB (5) and cover the four end faces of the square PCB (5), the square PCB (5) is respectively connected with a first metal grounding plate (71) and a second metal grounding plate (72) front and back, and the size of the metal grounding plate is the same as that of the side face of the square PCB (5).
2. A pattern electrically tunable linearly polarized dipole antenna as claimed in claim 1, characterized in that the feeding pattern is fed by means of a probe placed at the feeding port (6) in the centre of the square PCB.
3. A pattern electrically tunable linear dipole antenna according to claim 1, characterized in that the central feed port (6) comprises a first metal cylinder (61) and a second metal cylinder (62), the first metal cylinder (61) is connected to the first metal ground plate (71) of the square PCB (5), the second metal cylinder (62) is connected to the second metal ground plate (72) of the square PCB (5), the first metal cylinder (61) and the second metal cylinder (62) are connected back and forth in a stepped arrangement, and the central axis of the cylinder coincides with the central axis of the square PCB (5).
4. A pattern electrically tunable linearly polarized dipole antenna as claimed in claim 1 wherein four pairs of square patches (17, 18, 19, 110) are respectively located on the first dielectric sheet (81) for uniformly dividing the first dielectric sheet (81) into five sections; the slits between the first square patches (17) are connected by a first electric control switch (111), the slits between the second square patches (18) are connected by a second electric control switch (112), the slits between the third square patches (19) are connected by a third electric control switch (113), and the slits between the fourth square patches (110)) are connected by a fourth electric control switch (114); the four pairs of square patches (27, 28, 29, 210) are respectively positioned on the second medium sheet (82) and uniformly divide the second medium sheet (82) into five parts; the slits between the fifth square patches (27) are connected by a fifth electric control switch (211), the slits between the sixth square patches (28) are connected by a sixth electric control switch (212), the slits between the seventh square patches (29) are connected by a seventh electric control switch (213), and the slits between the eighth square patches (210) are connected by an eighth electric control switch (214); the four pairs of square patches (37, 38, 39, 310) are respectively positioned on the third medium sheet (83) and uniformly divide the third medium sheet (83) into five parts; the slits between the ninth square patches (37) are connected by a ninth electric control switch (311), the slits between the tenth square patches (38) are connected by a tenth electric control switch (312), the slits between the eleventh square patches (39) are connected by an eleventh electric control switch (313), and the slits between the twelfth square patches (310) are connected by a twelfth electric control switch (314); the four square patches (47, 48, 49, 410) are respectively positioned on the fourth medium sheet (84) and uniformly divide the fourth medium sheet (84) into five parts; the slits between the thirteenth square patches (47) are connected by a thirteenth electric control switch (411), the slits between the fourteenth square patches (48) are connected by a fourteenth electric control switch (412), the slits between the fifteenth square patches (49) are connected by a fifteenth electric control switch (413), and the slits between the sixteenth square patches (410) are connected by a sixteenth electric control switch (414).
5. The pattern electrically tunable linear polarized dipole antenna according to claim 4, wherein said cathodes of all said electrically controlled switches are connected to said square patch in said-y direction, said square patch in said-y direction is connected to said negative electrode of said dc power supply through said dc wire, and said voltage of 0V is supplied to said cathodes of all said electrically controlled switches; the anodes of the capacitors are connected with square patches in the +y axis direction, and the square patches in the +y axis direction are connected with the positive electrode of a direct current power supply through a direct current feeder line to provide 3V voltage for the anodes of all the electric control switches.
6. A pattern electrically tunable linearly polarized dipole antenna as claimed in claim 5, characterized in that the four electrically controlled switches of the first antenna element (1) are simultaneously controlled by a dc power supply, the four electrically controlled switches of the second antenna element (2) are simultaneously controlled by a dc power supply, the four electrically controlled switches of the third antenna element (3) are simultaneously controlled by a dc power supply, and the four electrically controlled switches of the fourth antenna element (4) are simultaneously controlled by a dc power supply.
7. The pattern electrically tunable linearly polarized dipole antenna as defined in claim 4, wherein said 28 capacitors are connected to said back surface of said square PCB by dc cable, said capacitors being used to isolate dc current and to enhance the on-off independence of said electrically controlled switches of said four antenna elements.
8. The electrically tunable linearly polarized dipole antenna according to claim 4, wherein said electrically controllable switch is a diode, the cathode of said diode being connected to said square patch in the +y direction, and the cathode of said diode being connected to said square patch in the-y direction.
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| CN108092007B (en) * | 2018-01-04 | 2023-06-30 | 南京信息工程大学 | Beam switching intelligent antenna |
| CN110289480A (en) * | 2019-07-12 | 2019-09-27 | 南京信息工程大学 | A kind of beam scanning array antenna of dipoles applied to smartwatch |
| CN113078462B (en) * | 2021-03-15 | 2022-10-11 | 电子科技大学 | Broadband electrically-adjustable parasitic unit antenna covering WLAN frequency band |
| CN113410662A (en) * | 2021-06-16 | 2021-09-17 | 东南大学 | Broadband directional diagram reconfigurable antenna based on PIN diode switch |
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