CN111129717A - Dual-polarization broadband millimeter wave back cavity butterfly antenna for mobile terminal - Google Patents
Dual-polarization broadband millimeter wave back cavity butterfly antenna for mobile terminal Download PDFInfo
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- CN111129717A CN111129717A CN202010044939.3A CN202010044939A CN111129717A CN 111129717 A CN111129717 A CN 111129717A CN 202010044939 A CN202010044939 A CN 202010044939A CN 111129717 A CN111129717 A CN 111129717A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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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
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
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Abstract
The invention discloses a dual-polarization broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal, and belongs to the technical field of wireless communication and antennas. The dual-polarization broadband millimeter wave back cavity butterfly antenna comprises upper metal, a dielectric substrate and lower metal, wherein radio-frequency signals are input from the starting end of a microstrip line of the lower metal and are coupled to a butterfly radiation opening through a rectangular cavity formed by four rows of metallized through holes, so that the resonant frequency of the antenna working at 28GHz is excited. The invention has low section, small size and easy integration; according to the invention, the butterfly-shaped radiation opening is utilized to realize the co-location design of two antennas with different polarizations, so that the physical size of the antenna is more effectively utilized, the antenna has the advantage of dual polarization and the isolation degree is higher; compared with the traditional rectangular opening, the butterfly-shaped radiation opening adopted by the invention has better gain, and compared with the rectangular cavity-backed opening antenna, the impedance change of the butterfly-shaped radiation opening is more gradual, and the bandwidth is wider.
Description
Technical Field
The invention belongs to the technical field of wireless communication and antennas, and particularly relates to a dual-polarization broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal.
Background
With the explosive increase of the number of mobile communication users and terminals and the continuous improvement of the requirements of social production and life on data transmission rate and communication quality, how to effectively expand the capacity of a communication system, reduce multipath attenuation, improve the frequency utilization rate and the like is becoming a hot spot in the research of the fifth generation mobile communication technology (5G). Among them, millimeter wave communication is becoming one of hot technologies of 5G, and its research on antenna technology is very critical. The major problem with millimeter wave communications is the large path loss, often requiring the use of phased array antennas. At the base station side, the space available is large and thus the limitation on the antenna size is small. On the contrary, in the mobile phone terminal, the phased array antenna is required to realize a low profile and a small size due to the limitation of space. Meanwhile, considering that the incident direction of the terminal signal is random, the antenna needs to satisfy higher gain and larger coverage rate. Moreover, the polarization mode of the incident signal is also random, and in order to ensure better communication quality, the terminal antenna is often required to have dual polarization characteristics, which all provide challenges for the design of the terminal phased array antenna.
Disclosure of Invention
Aiming at the difficulties and challenges of the 5G antenna, the invention provides a dual-polarization broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal, and the dual-polarization broadband millimeter wave cavity-backed butterfly antenna unit forms a phased array and is integrated in a mobile phone frame, so that the use effects of dual polarization, high gain and large coverage are realized.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a dual-polarization broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal comprises an upper layer metal 3, a dielectric substrate 6 and a lower layer metal 5; the upper layer metal 3, the lower layer metal 5 and the medium substrate 6 are of thin plate structures, and the upper layer metal 3 and the lower layer metal 5 are printed on two side surfaces of the medium substrate 6.
The butterfly-shaped radiation opening 2 is etched on the upper layer metal 3, and the butterfly-shaped radiation opening 2 is formed by mutually orthogonal two bowknot-shaped openings; the periphery of the butterfly-shaped radiation opening 2 is provided with a plurality of metalized through holes 1 arranged in a square shape, the butterfly-shaped radiation opening 2 is positioned in the center of the square surrounded by the metalized through holes 1, and all the metalized through holes 1 penetrate through the upper layer metal 3, the medium substrate 6 and the lower layer metal 5.
And any side of the lower layer metal 5 is etched with two rectangular grooves, the rectangular grooves are used as a coplanar waveguide feed structure, a microstrip line 4 is arranged in the coplanar waveguide feed structure, and the microstrip line 4 is connected with a probe and used for exciting a dual-polarization broadband millimeter wave back cavity butterfly antenna. The impedance of the dual-polarized and broadband millimeter wave back-cavity butterfly antenna is changed by adjusting the size of the rectangular groove, so that the impedance matching with the microstrip line 4 is realized. The distance between the two microstrip lines 4 is important for the isolation between the dual-polarized broadband millimeter wave back cavity butterfly antenna, and the isolation is higher when the distance is larger. As can be seen in fig. 4, the isolation between the two orthogonal antennas is greater than 12 dB. The pattern of figure 5 shows that the bowtie shaped openings each provide plus or minus 45 ° linear polarization with cross polarization components less than-12 dB, achieving well orthogonal polarization.
When two microstrip lines 4 (port 1 and port 2) on the lower layer metal 5 are respectively fed, TE is excited in the cavity120And TE210The two degenerate modes further enable the two corresponding bowtie-shaped openings to generate radiation, so that dual polarization of the dual-polarization broadband millimeter wave cavity-backed butterfly antenna is realized. In order to confine most of the electromagnetic wave in the chamber and prevent the processing trouble caused by the excessive density of the metallized through holes 1.
Since the antenna operates in the millimeter wave band of 28GHz, the propagation loss in air is relatively large compared to microwave. Considering the practical application problem at the mobile phone terminal, in order to compensate the path loss, the gain of the antenna must be increased, so a mode of combining the antenna into a 1 × 4 antenna array is adopted, two 1 × 4 antenna arrays are placed on two longer frames of the mobile phone terminal, and the antenna array has the advantages of small volume, good integration level, high isolation, high gain and dual polarization.
Furthermore, the diameter d of each metalized through hole 1 is 0.2-0.8 mm, and the distance s between the circle centers of every two adjacent metalized through holes 1 is 0.3-1.2 mm.
Further, the dielectric substrate 6 is made of Rogers RTDuroid 5880 material with the dielectric constant of 2.2 and the loss tangent angle of 0.0009.
The working process of the invention is as follows: radio frequency signals are input from the end 4 of the microstrip line of the lower layer metal 5, coupled to the butterfly-shaped radiation opening 2 through a rectangular cavity formed by four rows of metallized through holes 1, and excited to work at the resonant frequency of 28 GHz.
Compared with the prior art, the invention has the beneficial effects that:
1) the dual-polarization broadband millimeter wave cavity-backed butterfly antenna has the advantages of low profile, small size and easy integration. The invention integrates the antenna in the mobile phone frame, does not occupy the space of the mobile phone substrate, does not influence the working performance of the Sub-6G antenna, and has small influence on the antenna by the hand model.
2) The invention realizes the co-location design of two antennas with different polarizations by using the butterfly-shaped radiation opening, more effectively utilizes the physical size of the antenna, and ensures that the antenna has the advantage of dual polarization and has higher isolation. The isolation between the antennas does not require loading of other elements.
3) Compared with the traditional rectangular opening, the cavity-backed aperture antenna has better gain, and compared with the rectangular cavity-backed aperture antenna, the impedance change of the butterfly-shaped radiation aperture is more gradual, and the bandwidth is wider.
4) The 1 x 4 antenna array integrated on the mobile phone frame has high gain and high coverage rate at the same time, and has small influence on the mobile phone frame when being held by hand.
Drawings
Fig. 1 is a schematic front view of an antenna unit;
fig. 2 is a schematic reverse view of the antenna element;
FIG. 3 is a side schematic view of an antenna unit;
FIG. 4 is a simulation S parameter of the present invention;
FIG. 5 is a radiation pattern of the present invention; fig. 5(a) is the radiation pattern when fed from port 1; fig. 5(b) is the radiation pattern when fed from port 2;
FIG. 6 is a schematic diagram of an antenna array integrated in a frame of a mobile phone terminal according to the present invention;
FIG. 7 is a simulation S parameter of the antenna array integrated into the frame of the handset terminal according to the present invention;
fig. 8 is a pattern of an antenna array simulated by the present invention at a phase difference of 0.
In the figure: 1. metallizing the through-hole; 2. a butterfly radiation opening; 3. an upper layer metal; 4. a microstrip line; 5. a lower layer metal; 6. a dielectric substrate; wSRepresents the maximum width of the bow-tie shaped opening; w2Represents the width of the microstrip line 4; l is1Indicating the depth of the rectangular groove; w1The width of the rectangular groove is indicated.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the drawings and the accompanying drawings.
Referring to fig. 1, 2 and 3, the dual-polarized and broadband millimeter wave cavity-backed butterfly antenna for the mobile terminal includes an upper metal layer 3, a dielectric substrate 6 and a lower metal layer 5.
Bowknot shape opening length LS3.33mm, the maximum width W of the bowtie-shaped mouth lengthSIs 2.8 mm. The dimensions of the square area formed by the metallized through holes 1 are 7.3 multiplied by 7.3mm2. The diameter d of each metallized through hole 1 is 0.4mm, and the distance s between the circle centers of two adjacent metallized through holes 1 is 0.6 mm. The dielectric substrate 6 has a thickness of 0.787mm and is made of Rogers RT Duroid5880 material having a dielectric constant of 2.2 and a loss tangent angle of 0.0009. The thickness of the upper and lower layer metal is 0.035 mm. Width W of microstrip line 42Is 0.6 mm; depth L of rectangular groove1Is 2.5mm, and has a width W1Is 2.2 mm.
Fig. 4 is a simulation S parameter of the dual-polarized, broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal according to the present invention, which shows that the antenna can generate effective resonance in a 28GHz band, the bandwidth is 27.6-28.4GHz, and the isolation between two orthogonally polarized ports is higher than 13dB within the working bandwidth.
Fig. 5(a) and (b) are radiation patterns of two bow-tie shaped openings of the dual-polarized, broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal according to the present invention, and it can be seen from the drawings that the two bow-tie shaped openings are respectively horizontally polarized and vertically polarized, and the cross polarization ratio is 11.7dB, which fully illustrates that the dual-polarized, broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal according to the present invention has good dual-polarized characteristics.
Referring to fig. 6, the dual-polarized, wideband millimeter wave cavity-backed butterfly antenna for mobile terminal is combined into an array, and two 1 × 4 arrays are respectively placed at the middle position of two longer frames of the mobile phone terminal (the position can be adjusted according to the requirement), and the overall size of the mobile phone terminal is 140 × 70 × 9mm3。
Fig. 7 is a simulation S parameter of the dual-polarized, broadband millimeter wave cavity-backed butterfly antenna array for a mobile terminal of the present invention, which shows that the dual-polarized, broadband millimeter wave cavity-backed butterfly antenna can generate effective resonance in a 28GHz band, the bandwidth is 27.64-28.39GHz, the isolation between two butterfly radiation openings 2 is higher than 12dB in the whole bandwidth, and the coupling between different dual-polarized, broadband millimeter wave cavity-backed butterfly antenna units is lower than 25dB, which indicates that the mutual coupling between two ports of the antenna and the antenna units is very small, and the influence of the mobile phone terminal on the antenna array is also very small.
Fig. 8 is a simulated radiation pattern of a dual-polarized, wideband millimeter wave cavity-backed butterfly antenna array in the E-plane and the H-plane at 28GHz when the phase difference between the dual-polarized, wideband millimeter wave cavity-backed butterfly antenna elements for the mobile terminal is 0 °. The maximum simulated gain of the array at 28GHz is 11.9dBi, and the cross polarization ratio in the E plane and the H plane is more than 8 dB.
The above examples are only for illustrating the technical idea and features of the present invention, and are only used for describing the present invention in detail, so that those skilled in the art can understand the content of the present invention and implement the present invention, and the protection scope of the present invention is not limited thereby. All equivalent changes and modifications made according to the disclosure of the present invention should be covered by the protection scope of the present invention.
Claims (4)
1. A dual-polarization broadband millimeter wave cavity-backed butterfly antenna for a mobile terminal is characterized by comprising an upper layer metal (3), a dielectric substrate (6) and a lower layer metal (5); the upper layer metal (3), the lower layer metal (5) and the medium substrate (6) are of thin plate structures, and the upper layer metal (3) and the lower layer metal (5) are printed on two side surfaces of the medium substrate (6);
the butterfly-shaped radiation opening (2) is etched on the upper layer metal (3), and the butterfly-shaped radiation opening (2) is formed by mutually orthogonal two bow-tie-shaped openings; a plurality of metalized through holes (1) arranged in a square shape are formed in the periphery of the butterfly-shaped radiation opening (2), the butterfly-shaped radiation opening (2) is located in the center of the square surrounded by the metalized through holes (1), and all the metalized through holes (1) penetrate through the upper layer metal (3), the medium substrate (6) and the lower layer metal (5);
and any side of the lower layer metal (5) is etched with two rectangular grooves, the rectangular grooves are used as a coplanar waveguide feed structure, microstrip lines (4) are arranged in the coplanar waveguide feed structure, and the microstrip lines (4) are connected with probes and used for exciting a dual-polarization broadband millimeter wave back cavity butterfly antenna.
2. The dual-polarization broadband millimeter wave cavity-backed butterfly antenna for the mobile terminal as claimed in claim 1, wherein the diameter d of each metallized through hole (1) is 0.2-0.8 mm, and the distance s between the centers of two adjacent metallized through holes (1) is 0.3-1.2 mm.
3. The dual-polarized, broadband millimeter wave cavity-backed butterfly antenna for mobile terminals according to claim 1, wherein the dielectric substrate (6) is made of Rogers RT Duroid5880 with a dielectric constant of 2.2 and a loss tangent angle of 0.0009.
4. The dual-polarized, broadband millimeter wave cavity-backed butterfly antenna for mobile terminals as claimed in claim 1, wherein when said dual-polarized, broadband millimeter wave cavity-backed butterfly antenna is applied to a mobile phone terminal, the eight dual-polarized, broadband millimeter wave cavity-backed butterfly antennas are equally divided into two groups, each group being installed at two longer frames of the mobile phone terminal in a 1 x 4 array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010044939.3A CN111129717A (en) | 2020-01-15 | 2020-01-15 | Dual-polarization broadband millimeter wave back cavity butterfly antenna for mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010044939.3A CN111129717A (en) | 2020-01-15 | 2020-01-15 | Dual-polarization broadband millimeter wave back cavity butterfly antenna for mobile terminal |
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| CN111129717A true CN111129717A (en) | 2020-05-08 |
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| CN202010044939.3A Withdrawn CN111129717A (en) | 2020-01-15 | 2020-01-15 | Dual-polarization broadband millimeter wave back cavity butterfly antenna for mobile terminal |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5581266A (en) * | 1993-01-04 | 1996-12-03 | Peng; Sheng Y. | Printed-circuit crossed-slot antenna |
| JP2007235235A (en) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | Aperture antenna |
| CN101242027A (en) * | 2007-11-12 | 2008-08-13 | 杭州电子科技大学 | Polarization antenna for directional coupler feedback low profile back cavity round |
| CN206907925U (en) * | 2017-07-20 | 2018-01-19 | 南京邮电大学 | Substrate integration wave-guide circular cavity knot groove slot antenna |
| WO2019130305A1 (en) * | 2017-12-26 | 2019-07-04 | Vayyar Imaging Ltd | Cavity backed slot antenna with in-cavity resonators |
| CN109980332A (en) * | 2018-08-14 | 2019-07-05 | 上海安费诺永亿通讯电子有限公司 | Millimeter wave antenna system, metal shell, user terminal and millimetre-wave attenuator equipment |
-
2020
- 2020-01-15 CN CN202010044939.3A patent/CN111129717A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5581266A (en) * | 1993-01-04 | 1996-12-03 | Peng; Sheng Y. | Printed-circuit crossed-slot antenna |
| JP2007235235A (en) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | Aperture antenna |
| CN101242027A (en) * | 2007-11-12 | 2008-08-13 | 杭州电子科技大学 | Polarization antenna for directional coupler feedback low profile back cavity round |
| CN206907925U (en) * | 2017-07-20 | 2018-01-19 | 南京邮电大学 | Substrate integration wave-guide circular cavity knot groove slot antenna |
| WO2019130305A1 (en) * | 2017-12-26 | 2019-07-04 | Vayyar Imaging Ltd | Cavity backed slot antenna with in-cavity resonators |
| CN109980332A (en) * | 2018-08-14 | 2019-07-05 | 上海安费诺永亿通讯电子有限公司 | Millimeter wave antenna system, metal shell, user terminal and millimetre-wave attenuator equipment |
Non-Patent Citations (3)
| Title |
|---|
| GUO QING LUO 等: "Development of Low Profile Cavity Backed Crossed Slot Antennas for Planar Integration", 《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 * |
| SOUMAVA MUKHERJEE 等: "Substrate Integrated Waveguide(SIW） Cavity Backed Slot Antenna for Polarization Diversity Application", 《2015 IEEE APPLIED ELECTROMAGNETICS CONFERENCE(AEMC）》 * |
| 李慧 等: "用于5G手机终端的双极化背腔缝隙天线阵列", 《2019年全国天线年会论文集（中册）》 * |
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Application publication date: 20200508 |