CN210224275U - Beam scanning dipole array antenna applied to smart watch - Google Patents
Beam scanning dipole array antenna applied to smart watch Download PDFInfo
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- CN210224275U CN210224275U CN201921090749.4U CN201921090749U CN210224275U CN 210224275 U CN210224275 U CN 210224275U CN 201921090749 U CN201921090749 U CN 201921090749U CN 210224275 U CN210224275 U CN 210224275U
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- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000005855 radiation Effects 0.000 abstract description 17
- 238000004088 simulation Methods 0.000 abstract description 14
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 26
- 230000005284 excitation Effects 0.000 description 5
- 238000002955 isolation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
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Abstract
The utility model discloses a be applied to beam scanning dipole array antenna of intelligent wrist-watch, including square metal ground, the metal is ground the plane side all and is equipped with the medium base plate, medium base plate perpendicular to metal ground upper surface and interconnect form wall structure all around, all print the same sinuous type dipole array element on the medium base plate, sinuous type dipole array element is arranged between two parties on the medium base plate, sinuous type dipole array element is formed by the folding sinuous of a plurality of dipole units, wherein is equipped with the feed port between two adjacent dipole units. The utility model discloses with power transmission efficiency maximize theory as the basis, adopt the unit of sinuous type dipole as array antenna, four array element work frequency channel simulation results can cover bluetooth, wiFi and ISM frequency channel, and radiation gain is high, radiant efficiency is high, the radiation pattern is various, and directional radiation pattern can realize the function of beam scanning at every single move face to have fine MIMO performance.
Description
Technical Field
The utility model belongs to the technical field of the antenna technique and specifically relates to a be applied to beam scanning dipole array antenna of intelligent wrist-watch.
Background
With the rapid development of mobile communications and the rapid growth of mobile users, smart antennas have been widely recognized as a key technology for improving communication quality and spectrum utilization. The wearable antenna has great application value in the fields of medical treatment, military and the like. In the aspect of medical treatment, the antenna, the sensor and the medical equipment can be placed on the human body together, and detected data are transmitted to the network terminal through the antenna, so that a doctor can monitor the physical state of a patient in real time; in the military field, the antenna can be placed on the helmet or the back of a soldier, so that the antenna is convenient for receiving and transmitting signals. In addition, wearable antennas can also find applications on firefighters, athletes. Wearable antenna systems have thus developed with a great deal of attention in both academia and industry. The smart antenna array can produce spatially directed beams and can adaptively steer radio signals in the direction of the user, while sidelobes and nulls are directed towards other possible interfering signals.
Therefore, the intelligent and wearable combined antenna has important significance, the antenna radiation mode of the existing intelligent watch is single, the function of beam scanning is not provided, and whether the performance of the antenna is affected by an electronic element inside the intelligent watch is rarely considered, so that the practical application is limited.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the not enough of background art, the utility model discloses a be applied to beam scanning dipole array antenna of intelligent wrist-watch.
The technical scheme is as follows: the utility model discloses a be applied to beam scanning dipole array antenna of intelligent wrist-watch, including square metal ground, the metal ground plane side all is equipped with the medium base plate, medium base plate perpendicular to metal ground surface and interconnect form wall structure all around, all print the same sinuous type dipole array element on the medium base plate, sinuous type dipole array element arranges placed in the middle on the medium base plate, sinuous type dipole array element is formed by the folding sinuous of a plurality of dipole units, wherein is equipped with the feed port between two adjacent dipole units.
The directional diagram characteristic of the dipole is utilized, the printed winding type dipole is used as an array element, the dipole is arranged on the dielectric substrate, and the equivalent wavelength on the substrate is smaller than the wavelength in the air, so that the size of the array antenna is effectively reduced, and the array antenna is easy to process.
The excitation distribution of the array elements is not in equal amplitude and in phase, but is optimized based on the power transmission maximization theory. By placing the receiving antenna at a specific position (radiation direction) in the far field, optimizing the transmission efficiency between the designed transmitting antenna and the receiving antenna, the excitation distribution of a group of transmitting antennas corresponding to the maximum transmission efficiency is found, and the group of excitation is the optimal excitation distribution required for designing the transmitting antenna. The group of excitations are given to the corresponding array elements by a radio frequency circuit feeding mode, thereby realizing the effect of directional radiation. The scattering parameters required for the whole process can be obtained by the electromagnetic simulation software HFSS 15.0.
Furthermore, the number of meanders of the dipole unit in the meander type dipole array element is more than six.
Furthermore, the upper and lower heights of the dipole units in the meandering dipole array element are consistent, the upper end of the meandering dipole array element is flush with the upper edge of the dielectric substrate, and the lower end of the meandering dipole array element is spaced from the metal ground by the same distance.
Further, the feeding port is arranged in the meandering-type dipole array element, and the upper end between the fourth dipole element and the fifth dipole element is flush with the upper edge of the dielectric substrate.
Furthermore, the dielectric substrate is made of FR4 material with the dielectric constant of 4.4, the loss tangent angle of 0.02 and the thickness of 1.6 mm.
Has the advantages that: compared with the prior art, the utility model has the advantages that: the utility model discloses with power transmission efficiency maximize theory as the basis, adopt the unit of sinuous type dipole as array antenna, four array element work frequency channel simulation results can cover bluetooth, wiFi and ISM frequency channel, and radiation gain is high, radiant efficiency is high, the radiation pattern is various, and directional radiation pattern can realize the function of beam scanning at every single move face to have fine MIMO performance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of a single meander dipole array element of the present invention;
FIG. 3 is a schematic diagram of the simulation of the human hand model of the present invention;
FIG. 4 shows the actual measurement and simulation reflection coefficient of the array element of the present invention placed on the hand model;
FIG. 5 is a diagram of the real and simulated isolation between the array elements of the present invention;
fig. 6 is the correlation coefficient chart of each port simulated in free space and on the human hand model of the utility model: (a) the correlation coefficient diagram of each port in the free space, (b) the correlation coefficient diagram of each port on the hand model;
fig. 7 is the array antenna radiation pattern of the present invention: (a) the method comprises the following steps of (1) actually measured and simulated directional diagrams of theta (0 degrees) in a free space, (b) simulated directional diagrams of theta (0 degrees) on a hand model, (c) actually measured and simulated directional diagrams of theta (35 degrees) on xoz surfaces in the free space, (d) simulated directional diagrams of theta (35 degrees) on a xoz surface (35 degrees) hand model, (e) actually measured and simulated directional diagrams of theta (35 degrees) on a yoz surface in the free space, and (f) simulated directional diagrams of theta (35 degrees) on the yoz surface;
fig. 8 is a schematic diagram illustrating simulation of electronic components inside the array antenna internal simulation smart watch of the present invention;
fig. 9 is the utility model discloses inside metal box emulation S parameter variation graph that has or not of array antenna: (a) a cell reflection coefficient variation graph, (b) an isolation variation graph;
fig. 10 is a graph showing the change of the simulated radiation pattern of the metal box inside the array antenna of the present invention: (a) the simulation directional diagram on the hand model is 0 degree, and the simulation directional diagram on the hand model is 35 degrees on the (b) xoz plane.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
The beam scanning dipole array antenna applied to the smart watch as shown in fig. 1 and fig. 2 comprises a square metal ground 1, wherein the metal ground 1 is provided with a dielectric substrate 2 on the upper plane side, the dielectric substrate 2 has a dielectric constant of 4.4, a loss tangent angle of 0.02 and a substrate thickness of 1.6mm, and is made of FR4 material with a size of 42mm × 42mm × 9.6mm, the dielectric substrate 2 is perpendicular to the upper surface of the metal ground 1 and is connected with each other to form a surrounding wall structure, the dielectric substrate 2 is printed with identical meandering dipole elements 3, the meandering dipole elements 3 are arranged on the dielectric substrate 2 in the center, the meandering dipole elements 3 are formed by folding six dipole elements 301 in a meandering manner, the upper and lower heights of the dipole elements 301 in the meandering dipole elements 3 are consistent, the upper ends are flush with the upper edge of the dielectric substrate 2, and the lower ends are spaced from the metal ground 1 by the same distance, when the meander type dipole array element 3 is printed on the dielectric substrate 2, the vertical space of the dielectric substrate 2 should be as large as possible, that is, the upper end is flush with the upper edge of the dielectric substrate 2, and the lower end is spaced from the metal ground 1 by as small a distance as possible. A feeding port 4 is provided between two adjacent dipole elements 301, and the feeding port 4 is disposed in the meandering dipole array element 3, and an upper end portion between the fourth dipole element and the fifth dipole element is flush with an upper edge of the dielectric substrate 2. The size parameter L1 of the meander type dipole array element 3 is 1mm, L2 is 7mm, W1 is 1.5mm, W2 is 3mm, W3 is 5mm, W4 is 2mm, W5 is 5mm, and W6 is 3mm, and in the design process of the antenna, all scattering parameters are obtained by optimized design of electromagnetic simulation software HFSS 15.0.
The utility model is placed on a hand model for simulation as shown in figure 3.
As shown in fig. 4 and 5, after the antenna material object is manufactured, the reflection coefficient of the antenna is measured by using an N9918A vector network analyzer, and the measured reflection coefficient is compared with the reflection coefficient obtained by simulation, so as to obtain the reflection coefficient of the cell and the isolation between the cells respectively.
As shown in fig. 6, a correlation coefficient diagram simulated in the free space and on the human hand model by each port of the array antenna of the present invention is drawn, including the correlation coefficient diagram (a) of each port in the free space and the correlation coefficient diagram (b) of each port on the human hand model.
When an antenna directional diagram is measured, a Fourier transmission formula is applied:
(PR,dB-lR,dB)-(PT,dB+lT,dB)＝GT,dB+GR,dB-20log10f-20log10d+147.56
the specific steps required for measurement are as follows, with the horn as a standard antenna:
1. the standard antenna is connected with the signal generator through a transmission line, and the vector network analyzer is used for replacing a power meter and is connected with the antenna to be measured through the transmission line.
2. The signal generator frequency f, the transmission power PT is set.
3. Measuring the loss l of the transmission line between the standard antenna and the signal generator by a vector network analyzerT,dBLoss l of transmission line between the antenna under test and the vector network analyzerR,dB。
4. The heights of the standard antenna and the test antenna are adjusted to be the same horizontal plane, and the distance d between the antennas is ensured to be in a far field. And measuring the power PR received by the vector network analyzer.
5. Keeping the tested antenna still and rotating the standard antenna
And (5) angle, repeating the steps 4 and 5.
6. Then, the loss of the radio frequency feed circuit board is calculated, and the actually measured directional diagram of the array antenna in the free space is obtained and compared with the simulation, as shown in fig. 7.
As shown in fig. 8, fig. 9 and fig. 10, it is right to the utility model discloses the inside electronic component emulation of the inside simulation intelligence wrist-watch of array antenna obtains the utility model discloses there is not metal box emulation S parameter variation diagram inside the array antenna: (a) the unit reflection coefficient change diagram, (b) the isolation change diagram, and the utility model discloses there is not the metal box emulation radiation pattern change diagram inside the array antenna: (a) the simulation directional diagram on the hand model is 0 degree, and the simulation directional diagram on the hand model is 35 degrees on the (b) xoz plane.
The four-unit array antenna has the advantages of small size of 42mm multiplied by 9.6mm, small size, high gain, low manufacturing cost, 2.40GHz-2.52GHz working frequency band below-10 dB, bandwidth of about 120MHz, maximum directional gain of a pitching plane of 4.6dBi (free space) and 3.2dBi (placed at a position 3mm above a human hand model); the four-element array antenna can realize beam scanning on the pitch XOZ plane and the YOZ plane by directional radiation and has good MIMO performance. And a metal box with the size of 20mm multiplied by 7mm is added inside to simulate the electronic elements inside the intelligent watch, the performance of the antenna is not affected, and the antenna can be well applied to the intelligent watch equipment.
Compared with the prior art that Saou-Wen Sun, Yi-Ting Hsieh et al, the R & D research center of Taiwan ASUS, in 2015, proposed a WiFi/Bluetooth antenna Integrated in the smart watch bezel in Integrated metal-frame antenna for smart watch device (IEEETrans. antennas Propag., vol.63, No.7, pp.3301-3305, Jul.2015.), the four-element antenna array of the present invention has smaller size, diversified radiation pattern and higher gain; compared with the MIMO Antenna designed by the Design of MIMO Antenna with High Isolation for Smart applications Using the Theory of the resonant mode and the IEEE Trans Antenna, which is applied to the metal frame smart watch by DLWen and Y Hao et al of the university of London, Lendon, 2018, Lendon, Mary Imperial institute of electronics and computer science academy, the utility model discloses the MIMO Antenna has more Antenna array units, better MIMO performance, High radiation gain, High radiation efficiency and various radiation Modes.
Claims (5)
1. The utility model provides a be applied to beam scanning dipole array antenna of intelligent wrist-watch which characterized in that: the metal ground structure comprises a square metal ground (1), a dielectric substrate (2) is arranged on the side edge of the upper plane of the metal ground (1), the dielectric substrate (2) is perpendicular to the upper surface of the metal ground (1) and is connected with the upper surface of the metal ground (1) to form a peripheral wall structure, the same meandering dipole array elements (3) are printed on the dielectric substrate (2), the meandering dipole array elements (3) are arranged on the dielectric substrate (2) in the middle, the meandering dipole array elements (3) are formed by folding and meandering a plurality of dipole units (301), and a feed port (4) is arranged between two adjacent dipole units (301).
2. The beam scanning dipole array antenna for a smart watch of claim 1, wherein: the number of meanders of the dipole units (301) in the meander type dipole array element (3) is more than six.
3. The beam scanning dipole array antenna for a smart watch of claim 1, wherein: the upper and lower heights of the dipole units (301) in the meandering dipole array element (3) are consistent, the upper end of the meandering dipole array element is flush with the upper edge of the dielectric substrate (2), and the lower end of the meandering dipole array element is spaced from the metal ground (1) by the same distance.
4. The beam scanning dipole array antenna for a smart watch of claim 1, wherein: the upper end part of the feeding port (4) arranged between the fourth folded dipole unit and the fifth folded dipole unit in the meandering type dipole array element (3) is flush with the upper edge of the medium substrate (2).
5. The beam scanning dipole array antenna for a smart watch of claim 1, wherein: the dielectric substrate (2) is made of FR4 material with the dielectric constant of 4.4, the loss tangent angle of 0.02 and the thickness of 1.6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921090749.4U CN210224275U (en) | 2019-07-12 | 2019-07-12 | Beam scanning dipole array antenna applied to smart watch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921090749.4U CN210224275U (en) | 2019-07-12 | 2019-07-12 | Beam scanning dipole array antenna applied to smart watch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Effective date of registration: 20231107 Address after: Room 217, Exhibition Center Building, Xifuhe Digital Intelligent Innovation Community, No. 49 Wengang South Road, Yannan High tech Zone, Yancheng City, Jiangsu Province, 224008 (CNX) Patentee after: Jiangsu Yanquan Communication Technology Co.,Ltd. Address before: 210044 No. 219 Ning six road, Jiangbei new district, Nanjing, Jiangsu Patentee before: Nanjing University of Information Science and Technology |
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