CN109004344B - Broadband antenna applied to 5G mobile terminal - Google Patents
Broadband antenna applied to 5G mobile terminal Download PDFInfo
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- CN109004344B CN109004344B CN201810815964.XA CN201810815964A CN109004344B CN 109004344 B CN109004344 B CN 109004344B CN 201810815964 A CN201810815964 A CN 201810815964A CN 109004344 B CN109004344 B CN 109004344B
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- 239000002184 metal Substances 0.000 claims abstract description 65
- 229910052751 metal Inorganic materials 0.000 claims abstract description 65
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims description 60
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000005855 radiation Effects 0.000 abstract description 5
- 238000001228 spectrum Methods 0.000 abstract description 5
- 238000005388 cross polarization Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses a broadband antenna applied to a 5G mobile terminal, which comprises the following four layers of structures sequentially arranged from top to bottom: a first layer structure comprising a top layer patch structure; a second layer structure comprising metal straps for coupling microwave signals to the top layer patch structure, creating two resonant modes; the third layer structure is a metal large stratum provided with a circular gap; and the fourth layer structure comprises a feed structure, and the feed structure is connected with the metal strip through a metal through hole penetrating through the circular gap. The broadband antenna solves the problem that the existing antenna technology is difficult to solve the problems of low profile and broadband at the same time, keeps the height of the whole profile of the antenna low, realizes wide spectrum bandwidth coverage, has good radiation performance in a frequency band, and has symmetrical directional patterns and small cross polarization.
Description
Technical Field
The invention relates to the field of communication, in particular to a broadband antenna applied to a 5G mobile terminal.
Background
The fifth generation mobile communication technology can realize the data transmission rate of 1-10Gb/s by fully utilizing the bandwidth resources of millimeter wave frequency bands (such as 28GHz,39GHz and 60 GHz). But in the millimeter wave band, the transmission path loss of electromagnetic waves increases significantly. At the mobile end, phased array antenna technology capable of providing a directional scanning beam has received the most widespread attention in order to ensure communication quality and reduce power consumption. Currently, phased array antenna technology at the mobile end has various implementation systems, and a AiP (Antenna in Package) design scheme with great application potential as shown in fig. 1 is considered, wherein a radio frequency chip and an antenna are respectively positioned on the upper surface and the lower surface of a medium carrier plate, and a pin at the output end of the chip and a feed input end of the antenna can be connected with high efficiency through a circular gap.
The scheme is applied to a mobile terminal of a mobile phone working in a millimeter wave frequency band, wherein the design of an antenna needs to fully consider the design requirements of a low profile and a broadband, and takes a 28GHz frequency band as an example: 1) The height of the mobile terminal is required to be light and thin, and the antenna part is required to keep a very low profile height in addition to the processing limitation of the high-precision chip packaging substrate, and under the precondition of adopting a low dielectric constant substrate, the thickness is usually 0.8 mm-1 mm (0.06 lambda) 0 ～0.08λ 0 ，λ 0 For designing the wavelength in air at the center frequency) to a maximum limit; 2) According to the 5G spectrum plan, the antenna needs to meet a spectrum coverage of 24.75-27.5GHz (15% relative bandwidth). Aiming at the antenna design of the mobile terminal AiP of the millimeter wave frequency band, only a small amount of front-edge technology reports exist at present. For example, an electromagnetic dipole scheme may be applied to this type of antenna design, but an electromagnetic dipole antenna is extremely sensitive to the cross-sectional height, which is 0.06 λ 0 Or lower, it is difficult to achieve a broadband coverage of more than 15%; in addition, there is also a microstrip patch antenna design technology that combines slot feeding with parasitic elements, which is also difficult to meet the above two design requirements of low profile and broadband.
In short, antenna design in millimeter wave band AiP is faced with design requirements in terms of both low profile and broadband coverage. Currently, there are new reports about antenna designs in the millimeter wave band mobile terminal AiP scheme. The latest researches result in that the design requirements of the low profile and the broadband are difficult to be simultaneously met, or the requirements on the processing technology are too high, so that the cost is obviously increased.
Disclosure of Invention
The invention aims to solve the technical problem that the design requirement or the defect of higher cost in the aspects of low profile and broadband are difficult to be simultaneously taken into consideration in the prior art, and provides a broadband antenna applied to a 5G mobile terminal.
The technical scheme adopted for solving the technical problems is as follows: a broadband antenna applied to a 5G mobile terminal is constructed, comprising the following four-layer structure which is sequentially arranged from top to bottom:
a first layer structure comprising a top layer patch structure;
a second layer structure comprising a metal strap for coupling microwave signals to the top layer patch structure, creating two resonant modes;
the third layer structure is a metal large stratum provided with a circular gap;
and the fourth layer structure comprises a feed structure, and the feed structure is connected with the metal strip through a metal through hole penetrating through the circular gap.
In the antenna of the present invention, the top patch structure includes two rectangular metal patches having a predetermined pitch, the two rectangular metal patches being arranged side by side in a direction parallel to the metal strip.
In the antenna of the invention, the first layer structure further comprises a first layer dielectric substrate with the top surface provided with the top patch structure, the second layer structure further comprises a second layer dielectric substrate with the top surface provided with the metal strip, and the fourth layer structure comprises a third layer dielectric substrate with the bottom surface provided with the feed structure;
the first layer of dielectric substrate is attached to the second layer of dielectric substrate, the large metal stratum is attached to the second layer of dielectric substrate and the third layer of dielectric substrate respectively, and the metal through holes penetrate through the third layer of dielectric substrate and the second layer of dielectric substrate.
In the antenna of the present invention, the first layer of dielectric substrate, the second layer of dielectric substrate, the metal large layer and the third layer of dielectric substrate are identical in shape and are rectangular, the metal strip is arranged in the center of the second layer of dielectric substrate, and the extending direction of the metal strip is parallel to one side edge of the second layer of dielectric substrate.
In the antenna of the present invention, the feed structure includes a microstrip line, the microstrip line being parallel to the metal strip; the first end of the microstrip line is positioned at the edge of the third layer of dielectric substrate and is used for connecting with an output port of the radio frequency chip; the tail end of the microstrip line is located right below the circular gap.
The broadband antenna applied to the 5G mobile terminal has the following beneficial effects: the broadband antenna solves the problem that the existing antenna technology is difficult to solve the problems of low profile and broadband at the same time, keeps the height of the whole profile of the antenna low, realizes wide spectrum bandwidth coverage, has good radiation performance in a frequency band, and has symmetrical directional patterns and small cross polarization.
Drawings
For a clearer description of an embodiment of the invention or of a technical solution in the prior art, the drawings that are needed in the description of the embodiment or of the prior art will be briefly described, it being obvious that the drawings in the description below are only embodiments of the invention, and that other drawings can be obtained, without inventive effort, by a person skilled in the art from the drawings provided:
FIG. 1 is a schematic diagram of a AiP solution;
fig. 2 is a schematic cross-sectional structure of an antenna according to an embodiment of the present invention;
fig. 3 is a schematic plan view of a first layer structure of an antenna according to an embodiment of the present invention;
fig. 4 is a schematic plan view of a second layer structure of an antenna provided in an embodiment of the present invention;
fig. 5 is a schematic plan view of a third layer structure of an antenna according to an embodiment of the present invention;
fig. 6 is a schematic plan view of a fourth layer structure of an antenna provided in an embodiment of the present invention;
fig. 7 is a schematic diagram of transmission response and radiation response of an antenna provided in an embodiment of the present invention;
fig. 8 is a simulated pattern of an antenna provided in an embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Exemplary embodiments of the present invention are illustrated in the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It is noted that the terms "vertical," "horizontal," and the like are used herein for illustrative purposes only. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various constituent elements, but these constituent elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first component may be termed a second component, and, similarly, a second component may be termed a first component, without departing from the scope of the present invention.
Referring to fig. 2-5, a broadband antenna for a 5G mobile terminal according to an embodiment of the present invention includes the following four-layer structure sequentially disposed from top to bottom in a vertical direction:
the first layer structure 1 comprises a first layer dielectric substrate and a top layer patch structure 5 arranged on the top surface of the first layer dielectric substrate;
the second layer structure 2 comprises a second layer dielectric substrate and a metal strip 6 arranged on the top surface of the first layer dielectric substrate, wherein the metal strip 6 is used for coupling microwave signals to the top patch structure 5 to generate two resonance modes;
the third layer structure 3 is a metal large stratum 8 provided with a circular gap 7;
the fourth layer structure 4 comprises a third layer of medium substrate and a feed structure arranged on the bottom surface of the third layer of medium substrate, the feed structure is connected with a metal through hole 10, and the metal through hole 10 penetrates through the third layer of medium substrate, the circular gap 7 of the metal large stratum 8 and the second layer of medium substrate in sequence, and then is connected with the metal strip 6. Wherein the metal via 10 is actually formed by the outer surface of a metal copper pillar.
The first layer of dielectric substrate, the second layer of dielectric substrate, the metal large stratum 8 and the third layer of dielectric substrate are identical in shape and rectangular, and projections of the first layer of dielectric substrate, the second layer of dielectric substrate, the metal large stratum 8 and the third layer of dielectric substrate are overlapped on a horizontal plane. The first layer of dielectric substrate is attached to the second layer of dielectric substrate, the large metal stratum 8 is attached to the second layer of dielectric substrate and the third layer of dielectric substrate respectively, and the metal through holes 10 penetrate through the third layer of dielectric substrate and the second layer of dielectric substrate.
Referring to fig. 3, in particular, the top-layer patch structure 5 includes two rectangular metal patches having a predetermined pitch, the two rectangular metal patches being disposed side by side in a direction parallel to the metal strip 6. The arrangement direction of each rectangular metal patch is consistent with the arrangement direction of the corresponding dielectric substrate, namely, the side edge of the rectangular metal patch is parallel to the corresponding side edge of the dielectric substrate.
Referring to fig. 4, the metal strap 6 is disposed at the center of the second dielectric substrate, and the extending direction of the metal strap 6 is parallel to one of the pair of sides of the second dielectric substrate.
Referring to fig. 6, the feed structure comprises a microstrip line 9, the microstrip line 9 being parallel to the metal strip 6. The head end of the microstrip line 9 is located at the edge of the third layer of dielectric substrate and is used for connecting with an output port of a radio frequency chip; the end of the microstrip line 9 is located right below the circular slot 7, and a metal through hole 10 connects the end of the microstrip line 9 and the metal strap 6.
In this embodiment, the narrow metal strip 6 and the two metal patches with appropriate spacing are introduced, so that the two metal patches are in a weak coupling state (i.e. the coupling between the two metal patches is weaker than that between the two metal patches under the condition of the same section height), and the effect of realizing the mutual coupling of the two metal patches in a low section mode is achieved. The microstrip line 9 is used for feeding the metal strip 6, and then the metal strip 6 couples microwave signals to the two rectangular metal patches to generate two resonance modes, so that the effect of wideband operation of the antenna is achieved.
The following describes the effects of the antenna of the present invention using the 28GHz hot spot frequency band as an example, and it can be understood that the antenna of the present invention is not limited to the 28GHz frequency band, and can be applied to other 5G frequency bands. The structure of the antenna is shown in fig. 2-6, and the transmission response and the radiation response of the antenna are shown in fig. 7, so that the 10-dB matching bandwidth is 16%, and the 5G hot spot frequency band of 24.75-27.5GHz is well covered. The gain in the frequency band is 6.01-6.48dBi. Fig. 8 is an antenna test pattern at 24.75GHz and 27.5GHz, the upper left hand image in fig. 8 being a 24.75GHz xoz face pattern, the upper right hand image being a 24.75GHz xoz face pattern, the lower left hand image being a 27.5GHz yoz face pattern, and the lower right hand image being a 27.5GHz xoz face pattern. It can be seen that the cross polarization of the antenna is better than 33dB in the 3-dB beam range. The dielectric substrates in this case are all substrates with a dielectric constant of 3.4 and a loss angle of 0.004, and the thicknesses of the first layer to the third layer of dielectric substrates are as follows: 0.6mm, 0.1mm, the thickness of the whole antenna above the metal large stratum 8 is 0.7mm, and the section height is 0.06lambda 0 。
In summary, the wideband antenna applied to the 5G mobile terminal has the following beneficial effects: the broadband antenna solves the problem that the existing antenna technology is difficult to solve the problems of low profile and broadband at the same time, keeps the height of the whole profile of the antenna low, realizes wide spectrum bandwidth coverage, has good radiation performance in a frequency band, and has symmetrical directional patterns and small cross polarization.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (3)
1. A broadband antenna applied to a 5G mobile terminal, comprising the following four layers of structures sequentially arranged from top to bottom:
a first layer structure comprising a top layer patch structure;
a second layer structure comprising a metal strap for coupling microwave signals to the top layer patch structure, creating two resonant modes;
the third layer structure is a metal large stratum provided with a circular gap;
a fourth layer structure comprising a feed structure connected to the metal strap through a metal through hole passing through the circular slit;
the top-layer patch structure comprises two rectangular metal patches with preset intervals, and the two rectangular metal patches are arranged side by side along the direction parallel to the metal strip;
the first layer structure further comprises a first layer medium substrate, the top surface of which is provided with the top patch structure, the second layer structure further comprises a second layer medium substrate, the top surface of which is provided with the metal strip, and the fourth layer structure comprises a third layer medium substrate, the bottom surface of which is provided with the feed structure;
the first layer of dielectric substrate is attached to the second layer of dielectric substrate, the large metal stratum is attached to the second layer of dielectric substrate and the third layer of dielectric substrate respectively, and the metal through holes penetrate through the third layer of dielectric substrate and the second layer of dielectric substrate.
2. The antenna of claim 1, wherein the first dielectric substrate, the second dielectric substrate, the metal macro layer, and the third dielectric substrate are identical in shape and rectangular, the metal strip is disposed at a center of the second dielectric substrate, and an extending direction of the metal strip is parallel to one of the sides of the second dielectric substrate.
3. The antenna of claim 1, wherein the feed structure comprises a microstrip line, the microstrip line being parallel to the metal strip; the head end of the microstrip line is positioned at the edge of the third layer of dielectric substrate and can be used for connecting with an output port of a radio frequency chip; the tail end of the microstrip line is located right below the circular gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810815964.XA CN109004344B (en) | 2018-07-24 | 2018-07-24 | Broadband antenna applied to 5G mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810815964.XA CN109004344B (en) | 2018-07-24 | 2018-07-24 | Broadband antenna applied to 5G mobile terminal |
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| CN109004344A CN109004344A (en) | 2018-12-14 |
| CN109004344B true CN109004344B (en) | 2023-12-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888508B (en) * | 2018-12-28 | 2021-09-24 | 瑞声精密电子沭阳有限公司 | Phased array antenna |
| CN109616751A (en) * | 2019-01-14 | 2019-04-12 | 南通至晟微电子技术有限公司 | A kind of low section broadband medium resonant aerial |
| CN112332115A (en) * | 2020-10-28 | 2021-02-05 | 北京机电工程研究所 | Multi-mode multifunctional communication navigation common-caliber integrated antenna |
| CN112582808B (en) * | 2020-11-13 | 2022-02-15 | 华南理工大学 | Broadband butterfly patch antenna array suitable for millimeter wave 5G communication |
| CN112803155A (en) * | 2021-04-14 | 2021-05-14 | 成都瑞迪威科技有限公司 | Structure for realizing antenna wide beam and smooth directional diagram in large-size ground |
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