CN118017238B - Modal reconfigurable vortex array antenna based on human body posture - Google Patents
Modal reconfigurable vortex array antenna based on human body posture Download PDFInfo
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- 238000004891 communication Methods 0.000 description 11
- 230000005684 electric field Effects 0.000 description 8
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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Abstract
The application belongs to the technical field of antennas, and relates to a human body posture-based mode reconfigurable vortex array antenna, which comprises the following components: four antenna units distributed in a square array, wherein one row of antenna units are worn on the left forearm of a human body, and the other row of antenna units are worn on the right forearm of the human body; carrying out equal-amplitude 90-degree phase difference feed on the four worn antenna units to generate vortex electromagnetic waves so as to realize the mode reconstruction of the vortex array antenna through the change of the human body posture; the antenna unit includes: the radiation layer is arranged on the top of the dielectric layer; the dielectric layer is of a rectangular structure, the area of the radiation layer is smaller than that of the dielectric layer, and the center of the dielectric layer is coincident with the center of the radiation layer; the antenna unit further includes: the floor layer is arranged at the bottom of the dielectric layer; the size of the floor layer is the same as the size of the dielectric layer to form a full coverage floor layer. The application can improve the information security and the anti-interference capability of the wearable antenna.
Description
Technical Field
The application relates to the technical field of antennas, in particular to a modal reconfigurable vortex array antenna based on human body gestures.
Background
With the advent of fifth generation mobile communication technology (5G), high-speed, low-delay and broadband information transmission rates would bring unprecedented information bonus to various industries, and in the process of constructing personal-centered everything interconnection, the growing growth of new technology applications such as telemedicine, smart city, unmanned, intelligent wearable and the like will be promoted.
In the intelligent wearable field, the wearable antenna is used as a device at the forefront end of a wearable product for realizing wireless communication, is one of core components of various intelligent wearable electronic devices, has performances directly affecting the capabilities of the wearable device such as communication, perception, detection, identification and the like, and has wide application prospects in the military and civil fields.
The wearable antenna is firstly applied to the field of field communication, is used as basic communication equipment to be configured and applied to the transmission and the reception of communication signals in the field environment, can meet the capability of single instant messaging, and can also improve the survivability of single person in the field environment.
In the prior art, the traditional wearable antenna is a single person carrying whip antenna, and due to the characteristics of large target and poor concealment, the problem of inconvenient movement is caused under limited space limiting conditions such as the field, and potential risks can be brought to life safety due to the poor concealment. In order to match modern requirements, the antenna is integrated in the areas of clothes, caps, armbands and the like, so that the conformal design of the antenna and the clothes is realized, and safer and more guaranteed communication services are provided for the modern requirements.
But even if the wearable antenna adopts a conformal design of the antenna and the clothing, the communication encryption capability is still poor.
Disclosure of Invention
In view of the above, it is necessary to provide a human body posture-based mode reconfigurable vortex array antenna capable of improving information security and anti-interference capability of a wearable antenna.
A human body pose based modal reconfigurable vortex array antenna comprising: four antenna units distributed in a square array, wherein one row of antenna units are worn on the left forearm of a human body, and the other row of antenna units are worn on the right forearm of the human body;
and feeding the four worn antenna units with equal amplitude and 90 DEG phase difference to generate vortex electromagnetic waves so as to realize the mode reconstruction of the vortex array antenna through the change of the human body posture.
Optionally, the antenna unit includes: the radiation layer is arranged on the top of the dielectric layer;
The dielectric layer is of a rectangular structure, the area of the radiation layer is smaller than that of the dielectric layer, and the center of the dielectric layer coincides with the center of the radiation layer.
Optionally, the antenna unit further includes: the floor layer is arranged at the bottom of the dielectric layer;
The size of the floor layer is the same as the size of the dielectric layer to form a full coverage floor layer.
Optionally, the antenna unit further includes: a coaxial probe;
The outer conductor of the coaxial probe is connected with the floor layer, and the inner conductor of the coaxial probe passes through the floor layer and the dielectric layer and then is connected with the radiation layer.
Optionally, the coaxial probe is spaced from the center of the dielectric layer by a distance other than zero.
Optionally, the radiation layer has an elliptical structure;
The two symmetry axes of the dielectric layer and the two symmetry axes of the radiation layer are respectively collinear.
Optionally, the ratio of the major axis to the minor axis of the elliptical structure is 4:3.
Optionally, an included angle between a connecting line between the coaxial probe and the center of the dielectric layer and a symmetry axis of the dielectric layer is not zero.
Optionally, the radiation layer has a rectangular structure, and a set of diagonal corners of the radiation layer are provided with chamfer angles which are symmetrical with respect to the center of the dielectric layer;
four sides in the dielectric layer and four sides in the radiation layer are respectively arranged in parallel at intervals.
Optionally, a line connecting the coaxial probe and a center of the dielectric layer is collinear with an axis of symmetry of the dielectric layer.
The reconfigurable vortex array antenna based on the human body posture is applied to the situation that the communication encryption capability of the wearable antenna is poor, and the reconfigurable vortex array antenna based on the human body posture is applied to the L/S wave band.
Drawings
FIG. 1 is a schematic diagram of a human-body-posture-based modal reconfigurable vortex array antenna in one embodiment;
fig. 2 is a schematic structural diagram of an L-band antenna unit according to an embodiment;
Fig. 3 is a specific size diagram of an L-band antenna element in one embodiment;
Fig. 4 is a graph of return loss results for an L-band antenna element in one embodiment;
fig. 5 is a radiation pattern of an L-band antenna element at 1.895GHz in one embodiment;
FIG. 6 is a human body position of the antenna in L-band +1 mode vortex wave radiation in one embodiment;
FIG. 7 is a diagram of an antenna in an L-band +1 mode vortex array antenna in one embodiment;
FIG. 8 is a graph of the antenna electric field profile in the L-band +1 mode vortex antenna in one embodiment;
FIG. 9 is a human body posture of an antenna in L-band-1 mode vortex wave radiation in one embodiment;
FIG. 10 is a diagram of an antenna in an L-band-1 mode vortex array antenna in one embodiment;
FIG. 11 is a graph of the antenna in L-band-1 mode vortex antenna electric field profile in one embodiment;
Fig. 12 is a schematic structural diagram of an S-band antenna unit according to another embodiment;
Fig. 13 is a specific size diagram of an S-band antenna element according to another embodiment;
Fig. 14 is a graph showing return loss results of an S-band antenna element according to another embodiment;
Fig. 15 is a radiation pattern of an S-band antenna element at 2.4GHz in another embodiment;
FIG. 16 is a human body posture of an antenna in S-band +1 mode vortex wave radiation in another embodiment;
FIG. 17 is a diagram of an antenna in an S-band +1 mode vortex array antenna in another embodiment;
FIG. 18 is a graph showing the electric field profile of an antenna in the S-band +1 mode vortex antenna in another embodiment;
FIG. 19 is a human body posture of an antenna in S-band-1 mode vortex wave radiation in another embodiment;
FIG. 20 is a diagram of an antenna in an S-band-1 mode vortex array antenna in another embodiment;
FIG. 21 is a graph showing the electric field profile of an antenna in the S-band-1 mode vortex antenna in another embodiment.
Reference numerals:
A radiation layer 1, a dielectric layer 2, a floor layer 3 and a coaxial probe 4.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality of sets" means at least two sets, for example, two sets, three sets, etc., unless specifically defined otherwise.
In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; the device can be mechanically connected, electrically connected, physically connected or wirelessly connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present application.
The present application provides a human body posture based modal reconfigurable vortex array antenna, as shown in fig. 1, in one embodiment, comprising: four antenna units distributed in square array, wherein one row of antenna units is worn on the left forearm of human body, and the other row of antenna units is worn on the right forearm of human body.
The four worn antenna units are subjected to equal-amplitude 90-degree phase difference feeding to generate vortex electromagnetic waves, namely electromagnetic waves carrying orbital angular momentum (Orbital Angular Momentum, OAM), so that the mode reconstruction of the vortex array antenna is realized through the change of the human body posture. Among them, orbital angular momentum is one of the basic physical properties of electromagnetic waves, and electromagnetic waves carrying orbital angular momentum are generally referred to as vortex electromagnetic waves.
The antenna unit includes: radiation layer, dielectric layer, floor layer and coaxial probe.
The radiation layer is arranged at the top of the dielectric layer, and the area of the radiation layer is smaller than that of the dielectric layer.
The dielectric layer is of a rectangular structure, and the center of the dielectric layer coincides with the center of the radiation layer.
The floor layer is arranged at the bottom of the dielectric layer, and the size of the floor layer is the same as that of the dielectric layer so as to form a full-coverage floor layer.
The coaxial probe includes: the coaxial probe comprises an outer conductor and an inner conductor, wherein the outer conductor of the coaxial probe is connected with a floor layer, the inner conductor of the coaxial probe penetrates through the floor layer and a medium layer and then is connected with a radiation layer, and a separation medium is arranged between the outer conductor and the inner conductor. The distance between the coaxial probe and the center of the dielectric layer is not zero, that is, the coaxial probe is offset.
The radiation layer, the floor layer, the outer conductor of the coaxial probe and the inner conductor of the coaxial probe are all made of metal materials, and the dielectric layer and the separation medium of the coaxial probe are all made of nonmetallic materials.
In the application, four worn antenna units are subjected to equal-amplitude 90-degree phase difference feed to generate vortex electromagnetic waves; the orbital angular momentum has spiral wave front phase, the orbital angular momentum among different modes are mutually orthogonal, and the orbital angular momentum has infinite modes in theory, so that the vortex electromagnetic wave carrying the orbital angular momentum has the characteristics of high information security and strong anti-interference capability; further, by changing the human body posture, the mode number of the orbital angular momentum is used as a modulation parameter, each path of information is modulated to the orbital angular momentum of different modes, and the orbital angular momentum channels which are independent of each other are owned under the same carrier frequency, so that the mode reconstruction of the vortex array antenna is realized, and the communication capacity and the system spectrum efficiency are greatly improved by utilizing the new degree of freedom of the mode number of the orbital angular momentum.
The reconfigurable vortex array antenna based on the human body posture is applied to the situation that the communication encryption capability of the wearable antenna is poor, the reconfigurable vortex array antenna based on the human body posture is applied to the L/S wave band, on the basis of the wearable antenna, the reconfigurable vortex array antenna based on the human body posture is realized through the change of the human body posture, the novel dimension except the frequency and the polarization direction, namely the dimension of the number of the modes is provided, the cracking difficulty is increased in multiple, the information safety and the anti-interference capability of the wearable antenna are improved, the application scene of the wearable antenna is widened, and the development of the wearable electronic equipment is promoted.
In a specific embodiment, the antenna is an L-band antenna element.
The structural schematic diagram shown in fig. 2 and the specific dimension diagram shown in fig. 3 are specifically:
The radiation layer is of an elliptical structure, the ratio of the major axis to the minor axis of the elliptical structure is 4:3, the thickness h0 is 0.035mm, the length b of the major axis is 24mm, and the length a of the minor axis is 18mm.
The two symmetry axes of the dielectric layer and the two symmetry axes of the radiation layer are respectively collinear, and the F4BTMS615 material is adopted, the dielectric constant is 6.15, the loss tangent value is 0.002, the thickness h1 is 0.787mm, the length L is 50mm, and the width W is 50mm.
The thickness h2 of the floor layer was 0.035mm, the length L was 50mm, and the width W was 50mm.
The included angle between the connecting line of the coaxial probe and the center of the dielectric layer and the symmetry axis of the dielectric layer is not zero, D550D34F05-430 is selected as the coaxial probe, the distance r1 between the central axis of the coaxial probe and the central axis of the elliptical structure is 18mm, and the included angle theta between the connecting line of the coaxial probe and the central axis of the elliptical structure and the horizontal line is 65 degrees.
It should be noted that the distance between the central axis of the coaxial probe and the central axis of the elliptical structure is equal to the length of the minor axis of the elliptical structure, so as to achieve better impedance matching.
As shown in the return loss result diagram shown in fig. 4, it can be seen that the center frequency of the antenna is 1.895GHz, and the impedance bandwidth covers 1.888-1.902GHz frequency band.
As can be seen from the radiation patterns of the antenna at the E-plane and the H-plane of 1.896GHz, the maximum gain reaches 4.04dbi, and the 3db beamwidths are 99.5 ° and 108.1 °, respectively, as shown in fig. 5.
As shown in fig. 6, the human body posture is that 4L-band antenna units are formed into a square array with the same array pitch p=80 mm, and the 4 antenna units worn on the small arm are subjected to equal-amplitude 90 ° phase difference feed, and the feed phases of ① # unit, ② # unit, ③ # unit and ④ # unit are 0 °, 90 ° unit, 180 ° unit and 270 ° unit in sequence.
According to the human body posture shown in fig. 6, with the left hand up and the right hand down, it can be derived from the array antenna pattern of fig. 7 and the antenna electric field distribution pattern of fig. 8 that the human body posture realizes the radiation of the +1 mode electromagnetic wave.
According to the human body posture shown in fig. 9, which is achieved by radiating electromagnetic waves of-1 mode, the right hand is up and the left hand is down, as can be seen from the array antenna pattern of fig. 10 and the antenna electric field distribution pattern of fig. 11.
Therefore, the square array formed by 4L-band antenna units realizes the reconfigurable array layout of the array antenna by exchanging the upper and lower positions of the small arms on the basis of ensuring the original feed phase to be unchanged.
In another specific embodiment, the antenna is an S-band antenna element.
The structural schematic diagram shown in fig. 12 and the specific dimension diagram shown in fig. 13 are specifically:
The radiation layer is of a rectangular structure, a group of opposite angles of the radiation layer are provided with chamfer angles which are symmetrical in center with respect to the center of the medium layer, the conductivity of the polyester fabric material which is printed by silver ink silk is 1.97X10 6 S/m, the thickness h3 is 0.12mm, the length L1 is 52mm, the width W1 is 52mm, the chamfer angles are of an isosceles right triangle structure, and the length C of the right angle side of the isosceles right triangle structure is 7mm.
Four sides in the dielectric layer and four sides in the radiation layer are respectively arranged at intervals in parallel, a flexible substrate material is adopted, specifically, a felt flexible material is adopted, the dielectric constant is 1.36, the loss tangent value is 0.02, the thickness h4 is 1mm, the length L2 is 60mm, and the width is equal to the length L2.
The thickness h5 of the floor layer is 0.12mm, the length L2 is 60mm, and the width is equal to the length L2.
The connecting line of the coaxial probe and the center of the dielectric layer is collinear with a symmetry axis of the dielectric layer, the coaxial probe is D550D34F05-430, and the distance Y between the center axis of the coaxial probe and the center axis of the dielectric layer is 20mm.
As shown in the return loss result diagram of fig. 14, it can be seen that the center frequency of the antenna is 2.43GHz, and the impedance bandwidth covers the 2.35-2.47GHz band.
As shown in the radiation pattern shown in FIG. 15, the radiation patterns of the antenna on the E plane and the H plane of 2.4GHz almost coincide, the maximum gain of the antenna reaches 2.64dBi, the 3dB beam widths are respectively 76.5 degrees and 77.2 degrees, and the 3dB beam widths are basically consistent, so that the vortex electromagnetic wave radiation performance of the array antenna can be better ensured.
As shown in fig. 16, the human body posture is that 4S-band antenna units are formed into a square array with the same array pitch p=80 mm, and the 4 antenna units worn on the small arm are subjected to equal-amplitude 90 ° phase difference feed, and the feed phases of ① # unit, ② # unit, ③ # unit and ④ # unit are 0 °, 90 ° unit, 180 ° unit and 270 ° unit in sequence.
From the human body posture shown in fig. 16, with the left hand up and the right hand down, it can be derived from the array antenna pattern of fig. 17 and the antenna electric field distribution pattern of fig. 18 that the human body posture realizes the radiation of the +1 mode electromagnetic wave.
According to the human body posture shown in fig. 19, which realizes-1 mode electromagnetic wave radiation, with the right hand up and the left hand down, by the array antenna pattern of fig. 20 and the antenna electric field distribution pattern of fig. 21.
Therefore, the square array formed by the 4S-band antenna units realizes the reconfigurable array layout of the array antenna by exchanging the upper and lower positions of the small arms on the basis of ensuring the original feed phase to be unchanged.
The L-band antenna unit and the S-band antenna unit are respectively verified in the L-band and the S-band through the two wearable antenna units, and the mode reconstruction of the vortex array antenna is realized through the change of the human body posture, so that the practicability of the application is proved. Specifically, four antenna units are worn on left and right small arms of a human body at equal intervals in pairs, and the width of the small arms of the human body is between 60mm and 80mm in order to enhance applicability, so that the frequency range adapted to the vortex array antenna based on the human body posture is limited to an L wave band and an S wave band, and by carrying out equal-amplitude 90-degree phase difference feeding on adjacent array elements in the array antenna formed by the four antenna units worn on the small arms, vortex electromagnetic waves are generated, and on the basis of ensuring the original feeding phase unchanged, the array layout of the wearable vortex array antenna is reconfigurable through the change of the human body posture, so that the mode of the wearable vortex array antenna is reconfigurable, and the information safety and the anti-interference capability of the wearable antenna are improved.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The utility model provides a mode reconfigurable vortex array antenna based on human gesture which characterized in that includes: four antenna units distributed in a square array, wherein one row of antenna units are worn on the left forearm of a human body, and the other row of antenna units are worn on the right forearm of the human body;
and feeding the four worn antenna units with equal amplitude and 90 DEG phase difference to generate vortex electromagnetic waves so as to realize the mode reconstruction of the vortex array antenna through the change of the human body posture.
2. The body posture based modal reconfigurable vortex array antenna of claim 1 wherein the antenna unit comprises: the radiation layer is arranged on the top of the dielectric layer;
The dielectric layer is of a rectangular structure, the area of the radiation layer is smaller than that of the dielectric layer, and the center of the dielectric layer coincides with the center of the radiation layer.
3. The body posture based modal reconfigurable vortex array antenna of claim 2, wherein the antenna unit further comprises: the floor layer is arranged at the bottom of the dielectric layer;
The size of the floor layer is the same as the size of the dielectric layer to form a full coverage floor layer.
4. A body-posture-based modal reconfigurable vortex array antenna according to claim 3, wherein the antenna unit further comprises: a coaxial probe;
The outer conductor of the coaxial probe is connected with the floor layer, and the inner conductor of the coaxial probe passes through the floor layer and the dielectric layer and then is connected with the radiation layer.
5. The body posture based modal reconfigurable vortex array antenna of claim 4 wherein the coaxial probe is a non-zero distance from the center of the dielectric layer.
6. The body posture-based modal reconfigurable vortex array antenna of claim 4 or 5 wherein the radiation layer is of elliptical configuration;
The two symmetry axes of the dielectric layer and the two symmetry axes of the radiation layer are respectively collinear.
7. The body posture based modal reconfigurable vortex array antenna of claim 6 wherein the ratio of the major axis to the minor axis of the elliptical structure is 4:3.
8. The body posture based modal reconfigurable vortex array antenna of claim 7 wherein the angle between the line of the coaxial probe and the center of the dielectric layer and the axis of symmetry of the dielectric layer is not zero.
9. The human-body-posture-based modal reconfigurable vortex array antenna of claim 4 or 5, wherein the radiation layer is of rectangular structure, and a set of diagonally opposite corners of the radiation layer are provided with cut angles that are centrosymmetric with respect to the center of the dielectric layer;
four sides in the dielectric layer and four sides in the radiation layer are respectively arranged in parallel at intervals.
10. The body posture based modal reconfigurable vortex array antenna of claim 9 wherein the line of the coaxial probe to the center of the dielectric layer is collinear with an axis of symmetry of the dielectric layer.
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