CN111129741A - 5G millimeter wave dual-frequency antenna system based on metal frame and mobile terminal - Google Patents
5G millimeter wave dual-frequency antenna system based on metal frame and mobile terminal Download PDFInfo
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- CN111129741A CN111129741A CN202010030414.4A CN202010030414A CN111129741A CN 111129741 A CN111129741 A CN 111129741A CN 202010030414 A CN202010030414 A CN 202010030414A CN 111129741 A CN111129741 A CN 111129741A
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- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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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
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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Abstract
The invention discloses a 5G millimeter wave dual-frequency antenna system based on a metal frame and a mobile terminal, wherein the antenna system comprises the metal frame, a slot antenna array is arranged on one side edge of the metal frame, a metal reflecting wall is arranged on the inner side of the metal frame, and the metal reflecting wall is arranged corresponding to the slot antenna array; the slot antenna array comprises at least two slot antenna units, each slot antenna unit comprises a first slot, a second slot and a third slot, one end of each second slot and one end of each third slot are respectively communicated with the corresponding first slot, and the length value of each second slot is smaller than that of each third slot. The antenna system is suitable for handheld equipment or mobile terminals with metal frames, has the characteristics of ultra-wide bandwidth, high gain and high efficiency, and can cover double frequency bands and form wave beams.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a 5G millimeter wave dual-band antenna system based on a metal frame and a mobile terminal.
Background
In recent years, with the rapid development of the fifth generation communication technology (5G), research and development for realizing the standardization of the 5G millimeter wave technology have been focused on in the communication field. According to the definition of 5G communication frequency band by the Federal communication Commission in the United states, the frequency spectrum not only increases a new frequency band within 6GHz, but also introduces a brand new millimeter wave. Currently, 11 candidate frequency bands in the range of 24.25-86 GHz have been considered for a 5G millimeter wave communication system. However, due to the characteristics of electromagnetic waves, the path loss of millimeter waves will be exponentially attenuated as the transmission distance increases. To cope with such high path loss, a high-gain antenna is required at both the mobile side and the base station side. Therefore, multi-antenna arrays with high gain are of interest. One of the main features of such an antenna system is called beamforming, which is to control the main radiation direction of the antenna by adjusting the amplitude and phase of each antenna element to achieve the requirement of spatial coverage. For the design of the terminal, due to the limited space structure, the antenna design has high requirements, and at the same time, the terminal needs to maintain good structural stability, fashionable appearance texture and the like. Therefore, in the age 3/4G, the metal bezel has become one of the most basic appearance configurations. In order to avoid the influence of the metal frame on the performance of the antenna, the metal frame is designed to be a part of the antenna. Nowadays, with the strong trend of 5G, the terminal antenna design is bound to cover the frequency band of millimeter waves. However, most of the current antenna designs of 5G millimeter waves only cover a single frequency band and occupy a large space.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the 5G millimeter wave dual-band antenna system based on the metal frame and the mobile terminal have the advantages of being small in size and high in gain.
In order to solve the technical problems, the invention adopts the technical scheme that:
A5G millimeter wave dual-frequency antenna system based on a metal frame comprises the metal frame, wherein a slot antenna array is arranged on one side edge of the metal frame, a metal reflecting wall is arranged on the inner side of the metal frame, and the metal reflecting wall and the slot antenna array are arranged correspondingly; the slot antenna array comprises at least two slot antenna units, each slot antenna unit comprises a first slot, a second slot and a third slot, one end of each second slot and one end of each third slot are respectively communicated with the corresponding first slot, and the length value of each second slot is smaller than that of each third slot.
Further, the second slit and the third slit are located on the same side of the first slit.
Furthermore, the metal reflecting wall is arranged in parallel relative to one side of the metal frame, which is provided with the slot antenna array.
Furthermore, the vertical distance between the metal reflecting wall and the slot antenna array is 1.5-2.3 mm.
Furthermore, the height value of the metal reflecting wall is the same as that of the metal frame, and both ends of the metal reflecting wall in the length direction exceed the slot antenna array by at least 4 mm.
Furthermore, one end of the second gap, which is far away from the first gap, is provided with a first bending structure, one end of the third gap, which is far away from the first gap, is provided with a second bending structure, and the bending direction of the first bending structure is opposite to that of the second bending structure.
Furthermore, a feeding point is arranged between the second gap and the third gap, and a grounding point is arranged on one side, far away from the feeding point, of the first gap.
Furthermore, an insulating medium layer is arranged in the slot antenna unit.
Further, the working frequency range of the slot antenna unit is 27.5-28.35 GHz and 37-40 GHz.
The invention relates to another technical scheme which is as follows:
a mobile terminal comprises the 5G millimeter wave dual-frequency antenna system based on the metal frame.
The invention has the beneficial effects that: the metal reflecting wall is arranged for reflecting the radiation lobe of the slot antenna array facing to the inner side of the metal frame, so that the radiation main lobe of the antenna array completely faces to the outer side of the metal frame, and the effect of improving the radiation gain of the antenna is achieved; the length values of the second gap and the third gap are different, so that the antenna array can work in different frequency ranges. When the antenna system is applied to the mobile terminal, the antenna system has the characteristics of small size, small occupied space, ultra-wide bandwidth, high gain, high efficiency, dual-band coverage and beam forming.
Drawings
Fig. 1 is a schematic partial structure diagram of a mobile terminal according to a first embodiment of the present invention;
fig. 2 is a schematic partial structural diagram of a 5G millimeter wave dual-band antenna system according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a slot antenna unit according to a first embodiment of the present invention;
fig. 4 shows a return loss test result of the slot antenna unit according to the first embodiment of the invention;
fig. 5 is a current distribution diagram of the slot antenna operating at 28GHz when the slot antenna unit of the first embodiment of the present invention is excited by feeding;
fig. 6 is a current distribution diagram of the slot antenna unit according to the first embodiment of the present invention, when the slot antenna unit is excited by feeding, the slot antenna operates at 39 GHz;
fig. 7 is a return loss test result of the 5G millimeter wave dual-band antenna system according to the first embodiment of the present invention;
fig. 8 is a corresponding relationship between a main radiation gain and a main lobe direction when the 5G millimeter wave dual-band antenna system according to the first embodiment of the present invention operates at 28 GHz;
fig. 9 is a corresponding relationship between a main radiation gain and a main lobe direction when the 5G millimeter wave dual-band antenna system according to the first embodiment of the present invention operates at 39 GHz;
fig. 10 is a schematic structural diagram of a slot antenna unit according to a second embodiment of the present invention.
Description of reference numerals:
1. a metal frame; 2. a slot antenna array; 21. a slot antenna unit; 211. a first slit; 212. a second slit; 2121. a first bending structure; 213. a third gap; 2131. a second bending structure; 214. a feed point; 215. a ground point; 3. a metal reflective wall; 4. and (7) a PCB board.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The most key concept of the invention is as follows: the metal reflecting wall is arranged for reflecting the radiation lobe of the slot antenna array facing the inner side of the metal frame, so that the radiation main lobe of the antenna array completely faces the outer side of the metal frame, and the effect of improving the radiation gain of the antenna is achieved.
Referring to fig. 1 to 3, a 5G millimeter wave dual-band antenna system based on a metal frame includes a metal frame 1, a slot antenna array 2 is disposed on one side of the metal frame 1, a metal reflective wall 3 is disposed on an inner side of the metal frame 1, and the metal reflective wall 3 is disposed corresponding to the slot antenna array 2; the slot antenna array 2 includes at least two slot antenna units 21, each slot antenna unit 21 includes a first slot 211, a second slot 212, and a third slot 213, one end of the second slot 212 and one end of the third slot 213 are respectively communicated with the first slot 211, and a length of the second slot 212 is smaller than a length of the third slot 213.
From the above description, the beneficial effects of the present invention are: the metal reflecting wall is arranged for reflecting the radiation lobe of the slot antenna array facing to the inner side of the metal frame, so that the radiation main lobe of the antenna array completely faces to the outer side of the metal frame, and the effect of improving the radiation gain of the antenna is achieved; the length values of the second gap and the third gap are different, so that the antenna array can work in different frequency ranges.
Further, the second slit 212 and the third slit 213 are located on the same side of the first slit 211.
As can be seen from the above description, the second slot and the third slot are disposed on the same side of the first slot, so that the overall size of the slot antenna unit can be reduced, and the distance between two adjacent slot antenna units is not affected. The distance between two adjacent slot antenna elements refers to the distance between corresponding points on the two adjacent slot antenna elements.
Further, the metal reflecting wall 3 is arranged in parallel with respect to one side of the metal frame 1 on which the slot antenna array 2 is arranged.
As can be seen from the above description, the metal reflective wall is disposed in parallel with the metal bezel to shield the main radiation lobe on the side of the metal reflective wall facing the metal reflective wall, so that the main radiation lobe is completely radiated on the other side.
Furthermore, the vertical distance between the metal reflecting wall 3 and the slot antenna array 2 is 1.5-2.3 mm.
As can be seen from the above description, when the distance between the metal reflective wall and the slot antenna array changes, the resonance generated by the slot antenna unit shifts. When the distance is 1.5-2.3 mm, the return loss value of the slot antenna unit in the working frequency range can be ensured to be lower than-10 dB.
Furthermore, the height value of the metal reflecting wall 3 is the same as that of the metal frame 1, and both ends of the metal reflecting wall 3 in the length direction exceed the slot antenna array 2 by at least 4 mm.
According to the description, the height value of the metal reflecting wall is the same as that of the metal frame, so that the radiation main lobe direction can be ensured to be completely directed to one side; meanwhile, in order to ensure that the main lobe radiation direction of the slot antenna unit faces one side, the length of the metal reflecting wall is as large as possible and at least exceeds the slot antenna array by 4 mm.
Further, a first bending structure 2121 is disposed at an end of the second slit 212 away from the first slit 211, a second bending structure 2131 is disposed at an end of the third slit 213 away from the first slit 211, and a bending direction of the first bending structure 2121 is opposite to a bending direction of the second bending structure 2131.
As is apparent from the above description, the provision of the bent structure can reduce the overall size of the slot antenna unit.
Furthermore, a feeding point 214 is disposed between the second slot 212 and the third slot 213, and a grounding point 215 is disposed on a side of the first slot 211 away from the feeding point 214.
Further, an insulating medium layer is provided in the slot antenna unit 21.
As can be seen from the above description, the filling of the insulating medium in the slot antenna unit is more attractive.
Further, the operating frequency range of the slot antenna unit 21 is 27.5 to 28.35GHz and 37 to 40 GHz.
The invention adopts another technical scheme that:
a mobile terminal comprises the 5G millimeter wave dual-frequency antenna system based on the metal frame.
As can be seen from the above description, the antenna system of the present invention has the characteristics of small size, small occupied space, ultra wide bandwidth, high gain, high efficiency, and capability of covering dual bands and beam forming when applied to a mobile terminal.
Example one
Referring to fig. 1 to 9, a first embodiment of the present invention is:
a mobile terminal, as shown in fig. 1, includes a metal frame-based 5G millimeter wave dual-band antenna system, where the metal frame of the 5G millimeter wave dual-band antenna system is the metal frame of the mobile terminal, and the mobile terminal may be a mobile phone or the like.
A slot antenna array 2 is arranged on one side edge of the metal frame 1, a metal reflecting wall 3 is arranged on the inner side of the metal frame 1, and the metal reflecting wall 3 is arranged corresponding to the slot antenna array 2. The metal frame 1 is rectangular, the length is 144mm, the width is 74mm, and the height is 8mm, and the slot antenna array 2 is arranged in the middle of one long side of the metal frame 1.
The metal reflecting wall 3 is arranged in parallel relative to one side of the metal frame 1, which is provided with the slot antenna array 2. Preferably, the vertical distance between the metal reflecting wall 3 and the slot antenna array 2 is 1.5-2.3 mm. It is further preferable that the vertical distance between the metal reflecting wall 3 and the slot antenna array 2 is 2 mm. The height value of the metal reflecting wall 3 is the same as that of the metal frame 1, two ends of the metal reflecting wall 3 in the length direction exceed the slot antenna array 2 by at least 4mm, and the long side direction of the metal reflecting wall 3 is the long side direction of the metal frame 1. In this embodiment, the metal reflective wall 3 is disposed on the PCB board 4 of the mobile terminal. The metal reflecting wall 3 is used for reflecting the column of radiation lobes of the slot antenna, which face towards the inner side, so that the radiation main lobe of the antenna faces towards the outer side completely, and the radiation gain of the antenna is improved.
The slot antenna array 2 includes at least two slot antenna units 21, the number of the slot antenna units 21 may be set according to needs, and in this embodiment, the number of the slot antenna units 21 is 8. As shown in fig. 2 and 3, the slot antenna unit 21 includes a first slot 211, a second slot 212, and a third slot 213, wherein one end of the second slot 212 and one end of the third slot 213 are respectively communicated with the first slot 211, and a length of the second slot 212 is smaller than a length of the third slot 213. Preferably, the second slit 212 and the third slit 213 are located on the same side of the first slit 211. One end of the second slot 212, which is far away from the first slot 211, is provided with a first bending structure 2121, one end of the third slot 213, which is far away from the first slot 211, is provided with a second bending structure 2131, and a bending direction of the first bending structure 2121 is opposite to a bending direction of the second bending structure 2131, that is, the slot antenna unit 21 is shaped like a transverse "pi". A feeding point 214 is arranged between the second slot 212 and the third slot 213, and a grounding point 215 is arranged on the side of the first slot 211 far away from the feeding point 214. The widths of the first slit 211, the second slit 212 and the third slit 213 may be adjusted as needed, and when the width of one of the slits is changed, the impedance of the operating frequency band covered by the slit may be changed, while the impedance of the operating frequency band covered by the other slit is not significantly changed. The lengths of the first slot 211, the second slot 212 and the third slot 213 may be adjusted as needed, the range of the working frequency band may be changed by adjusting the lengths of the slots, and the lower the frequency band is, the longer the length of the required slot is. In this embodiment, an insulating medium layer is disposed in the slot antenna unit 21.
In this embodiment, the operating frequency ranges of the slot antenna units are 27.5 to 28.35GHz and 37 to 40 GHz. The distance between two adjacent slot antenna units is 0.4-0.7 times of the corresponding wavelength of the working frequency. The distance between two adjacent slot antenna elements refers to the distance between corresponding points on the two slot antenna elements. If the distance between two adjacent slot antenna units is too large, the high-frequency (37-40 GHz) secondary lobe level is too high, and if the distance is too small, the low-frequency (27.5-28.35 GHz) slot antenna units are poor in isolation, so that the requirement for meeting the low-frequency isolation is met, and the high-frequency secondary lobe level is kept at a low level as far as possible, and in the embodiment, the distance between two adjacent slot antenna units is 4.8 mm.
Fig. 4 shows the return loss test result of the slot antenna unit of this embodiment, and it can be seen from the figure that, for the case that the return loss S11 of the excitation port is lower than-10 dB, the slot antenna unit generates two resonances at 28GHz and 39GHz, that is, the operating frequency bands that can be covered by the slot antenna array are 28GHz (operating frequency range 27.5-28.35 GHz) and 39GHz (operating frequency range 37-40 GHz).
Fig. 5 and 6 are current distribution diagrams of the slot antenna unit of the present embodiment when the slot antenna unit is excited by feeding, wherein the slot antenna operates at 28GHz and 39GHz, respectively. As is clear from the figure, the current loop formed by the third slot with a longer length in the slot antenna unit is mainly used for covering the 28GHz band, and the second slot with a shorter length is mainly used for covering the 39GHz band.
Fig. 7 shows the return loss test result of the 5G millimeter wave dual-band antenna system of the present embodiment. In the figure, S11 represents the return loss of each feed port in the antenna system, and the remaining curves (S21, S31, S41, etc.) represent the isolation of the feed ports between adjacent slot antenna elements, respectively. The results show that the antenna system can cover the frequencies of 28GHz and 39GHz under the condition that the return loss is lower than-10 dB, and the isolation of each port between the adjacent slot antenna units in the whole working frequency bandwidth is lower than-15 dB, thereby showing the advantage of good frequency bandwidth coverage.
Fig. 8 and 9 show the corresponding relationship between the main radiation gain and the main lobe direction when the antenna system is operated at 28GHz and 39GHz, respectively. By changing the phase difference between two adjacent slot antenna units and keeping the phase difference between every two slot antenna units consistent, the direction of the main lobe can also be correspondingly deflected, and the beam scanning characteristic of the array antenna is realized. As is clear from the results, the antenna system proposed in the present embodiment has a high gain, and the maximum gain of the antenna system does not decrease significantly with the change in the scanning angle in the main lobe direction.
The antenna system of the embodiment is suitable for a handheld device or a mobile terminal with a metal frame, has the characteristics of ultra-wide bandwidth, high gain and high efficiency, and can cover double frequency bands and beam forming.
Example two
Referring to fig. 10, a second embodiment of the present invention is:
a mobile terminal, which is different from the first embodiment in that: the end of the second slit 212 far away from the first slit 211 is not provided with the first bending structure, and the end of the third slit 213 far away from the first slit 211 is also not provided with the second bending structure, that is, the second slit 212 and the third slit 213 are both in a strip shape. In this embodiment, the lengths and widths of the first gap, the second gap, and the third gap are adjusted to still cover two frequency bands of 28GHz (operating frequency range 27.5-28.35 GHz) and 39GHz (operating frequency range 37-40 GHz), and the method has the characteristics of ultra wide bandwidth, high gain, high efficiency, and beam forming.
In summary, the 5G millimeter wave dual-band antenna system and the mobile terminal based on the metal frame provided by the invention are suitable for the handheld device or the mobile terminal with the metal frame, have the characteristics of ultra-wide bandwidth, high gain, high efficiency, capability of covering dual bands and beam forming.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A5G millimeter wave dual-frequency antenna system based on a metal frame comprises the metal frame and is characterized in that a slot antenna array is arranged on one side edge of the metal frame, a metal reflecting wall is arranged on the inner side of the metal frame, and the metal reflecting wall is arranged corresponding to the slot antenna array; the slot antenna array comprises at least two slot antenna units, each slot antenna unit comprises a first slot, a second slot and a third slot, one end of each second slot and one end of each third slot are respectively communicated with the corresponding first slot, and the length value of each second slot is smaller than that of each third slot.
2. The metal bezel-based 5G millimeter wave dual-band antenna system as claimed in claim 1, wherein the second slot and third slot are located on the same side of the first slot.
3. The metal-bezel-based 5G millimeter wave dual-band antenna system as claimed in claim 1, wherein the metal reflecting wall is disposed in parallel with respect to a side of the metal bezel on which the slot antenna array is disposed.
4. The metal-bezel-based 5G millimeter wave dual-frequency antenna system as claimed in claim 3, wherein a vertical distance between the metal reflecting wall and the slot antenna array is 1.5-2.3 mm.
5. The metal-bezel-based 5G millimeter wave dual-frequency antenna system as claimed in claim 1, wherein the height value of the metal reflecting wall is the same as that of the metal bezel, and both ends of the metal reflecting wall in the length direction exceed the slot antenna array by at least 4 mm.
6. The metal frame based 5G millimeter wave dual-frequency antenna system as claimed in claim 1, wherein a first bending structure is disposed at an end of the second slot away from the first slot, and a second bending structure is disposed at an end of the third slot away from the first slot, and a bending direction of the first bending structure is opposite to a bending direction of the second bending structure.
7. The metal frame based 5G millimeter wave dual-frequency antenna system as claimed in claim 2, wherein a feeding point is provided between the second slot and the third slot, and a grounding point is provided on a side of the first slot away from the feeding point.
8. The metal-frame-based 5G millimeter wave dual-frequency antenna system as claimed in claim 1, wherein an insulating medium layer is provided in the slot antenna unit.
9. The metal-border-based 5G millimeter wave dual-frequency antenna system as claimed in claim 1, wherein the operating frequency ranges of the slot antenna units are 27.5-28.35 GHz and 37-40 GHz.
10. A mobile terminal comprising the metal bezel-based 5G millimeter wave dual band antenna system as recited in any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010030414.4A CN111129741A (en) | 2020-01-13 | 2020-01-13 | 5G millimeter wave dual-frequency antenna system based on metal frame and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010030414.4A CN111129741A (en) | 2020-01-13 | 2020-01-13 | 5G millimeter wave dual-frequency antenna system based on metal frame and mobile terminal |
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| CN111129741A true CN111129741A (en) | 2020-05-08 |
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| CN112103659A (en) * | 2020-09-09 | 2020-12-18 | 深圳市信维通信股份有限公司 | Medium-loaded miniaturized ultra-wideband antenna structure and electronic equipment |
| CN112467337A (en) * | 2020-11-05 | 2021-03-09 | 北京小米移动软件有限公司 | Antenna assembly and terminal |
| CN112701467A (en) * | 2020-11-30 | 2021-04-23 | 维沃移动通信有限公司 | Electronic equipment |
| CN113410643A (en) * | 2021-05-19 | 2021-09-17 | 荣耀终端有限公司 | Terminal equipment with noise suppression structure |
| CN113451765A (en) * | 2021-06-11 | 2021-09-28 | 北京理工大学 | 5G mobile terminal antenna simultaneously working in Sub6GHz frequency band and millimeter wave frequency band |
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| CN112103659A (en) * | 2020-09-09 | 2020-12-18 | 深圳市信维通信股份有限公司 | Medium-loaded miniaturized ultra-wideband antenna structure and electronic equipment |
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| CN113451765A (en) * | 2021-06-11 | 2021-09-28 | 北京理工大学 | 5G mobile terminal antenna simultaneously working in Sub6GHz frequency band and millimeter wave frequency band |
| CN113451765B (en) * | 2021-06-11 | 2022-03-18 | 北京理工大学 | 5G mobile terminal antenna simultaneously working in Sub6GHz frequency band and millimeter wave frequency band |
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