CN109742515B - Millimeter wave circularly polarized antenna for mobile terminal - Google Patents
Millimeter wave circularly polarized antenna for mobile terminal Download PDFInfo
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- CN109742515B CN109742515B CN201811479930.4A CN201811479930A CN109742515B CN 109742515 B CN109742515 B CN 109742515B CN 201811479930 A CN201811479930 A CN 201811479930A CN 109742515 B CN109742515 B CN 109742515B
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- 239000000758 substrate Substances 0.000 claims abstract description 36
- 230000005855 radiation Effects 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims description 20
- 239000000523 sample Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 238000003491 array Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 abstract description 4
- 230000010287 polarization Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention discloses a millimeter wave circularly polarized antenna for a mobile terminal, which comprises a magnetic dipole antenna unit based on a semi-open substrate integrated waveguide resonant cavity and an electric dipole antenna unit taking a substrate integrated waveguide as a feed balun, wherein the magnetic dipole antenna unit and the electric dipole antenna unit are pressed. The invention has the end-fire radiation characteristic in performance, can improve circular polarization radiation, and has the advantages of low profile, light weight, easy integration, conformal convenience and the like in structure; in particular, when applied to mobile terminal equipment such as a mobile phone or a tablet computer, the terminal radiation signal is covered beyond the hemispherical space.
Description
Technical Field
The invention relates to a millimeter wave circularly polarized antenna for a mobile terminal, belonging to the technical field of wireless communication.
Background
As one of the important components of a wireless communication system, the performance of a millimeter wave antenna or antenna array directly determines the level of performance achievable by the system. For terminal equipment, the antenna used by the terminal equipment is required to meet the traditional bandwidth and gain indexes, and the terminal equipment is required to have the characteristics of miniaturization, wide beam coverage and the like; in particular, if the antenna is also capable of end-fire radiation characteristics, additional benefits may be realized such as improved energy utilization, reduced interference between the antenna and the internal circuitry of the device.
Circular polarized waves are favored in various application occasions because of their unique advantages in the aspects of resisting channel interference, aligning a receiving antenna and the like, and the implementation of circular polarized end-fire radiation in a millimeter wave frequency band is also a current research hot spot.
The omnibearing coverage capability of signal radiation of the mobile terminal application scenes such as mobile phones or tablet computers is also of practical significance. However, the use of a single antenna or a single antenna array does not meet the requirement of hemispherical omni-directional coverage of the handheld terminal device signal over the entire three-dimensional space. For this practical problem, the industry has not had an explicit solution so far, but with the rapid development of millimeter wave communication systems, the necessity and practical significance of providing a solution for omni-directional coverage of signal radiation by terminal devices are self-evident.
Disclosure of Invention
The invention aims to solve the problems of the prior art that the millimeter wave circularly polarized antenna which can be integrated in terminal equipment has the characteristics of end-emission radiation and can improve circularly polarized radiation, and has the advantages of low profile, light weight, easy integration, conformal convenience and the like in structure; in particular, when applied to mobile terminal equipment such as a mobile phone or a tablet computer, the terminal radiation signal is covered beyond the hemispherical space.
In order to solve the technical problems, the invention provides a millimeter wave circularly polarized antenna for a mobile terminal, which comprises a magnetic dipole antenna unit based on a semi-open substrate integrated waveguide resonant cavity and an electric dipole antenna unit taking a substrate integrated waveguide as a feed balun, wherein the magnetic dipole antenna unit and the electric dipole antenna unit are laminated and combined to form the millimeter wave circularly polarized antenna.
Further, the radiation of the magnetic dipole antenna unit is formed by a substrate integrated waveguide resonant cavity with one side open, and the substrate integrated waveguide resonant cavity is fed by a probe;
The radiation of the electric dipole antenna unit is formed by a printed array fed through a balun constituted by a substrate integrated waveguide.
Furthermore, the electric dipole antenna unit is provided with 1 or more printing arrays with the same size, and is connected through a metallized via hole.
Furthermore, the invention also comprises a microstrip line, wherein two excitations with constant amplitude and specific phase difference are obtained through the microstrip line, and the magnetic dipole antenna unit and the electric dipole antenna unit are excited respectively.
Further, the probes are realized by metallized vias.
Further, the magnetic dipole antenna unit comprises a first dielectric plate, a first metal floor, a second metal floor and a first metallized via hole group, wherein the first metal floor and the second metal floor are respectively arranged on the upper surface and the lower surface of the first dielectric plate, and the first metallized via hole group is contained in the first dielectric plate and forms a semi-open substrate integrated waveguide resonant cavity;
the electric dipole antenna unit further comprises a second dielectric plate, a third metal floor arranged on the upper surface of the second dielectric plate and a second metallized via hole group contained in the second dielectric plate, wherein the second metallized via hole group forms a substrate integrated waveguide feed balun;
The microstrip line is accommodated on the lower surface of the second dielectric plate, signals transmitted in the microstrip line are coupled into the substrate integrated waveguide feed balun through the microstrip line and the conversion structure, and enter the semi-open substrate integrated waveguide resonant cavity through the probe.
Furthermore, a hollowed-out area larger than the projected area of the probe is formed on the second metal floor, and the position of the hollowed-out area corresponds to the setting position of the probe.
Further, the antenna of the present invention is installed in various orientations of the mobile terminal device.
The beneficial effects are that: the end-fire circularly polarized millimeter wave antenna based on the combination of magnetic dipole radiation and electric dipole radiation has the following characteristics:
1. With an end-fire radiation pattern. The magnetic dipole antenna has end-fire characteristics, the E-plane directional diagram is wide, the vertical polarized radiation signals can be provided, the electric dipole antenna has end-fire characteristics, the H-plane directional diagram is wide, the horizontal polarized radiation signals can be provided, and the bottleneck problem of shielding millimeter wave signals by the metal outer frame of the mobile terminal such as a mobile phone is solved while the antenna performance is improved by the metal outer frame; the radiation of the antenna is generated by the open side of the integrated waveguide resonant cavity, so that the directional radiation in the propagation direction of the waveguide can be realized.
2. The three-dimensional space signal coverage device has the characteristics of low profile, easy integration and wide beam coverage, and three antennas are respectively arranged on the left side, the right side and the upper side of the device, so that the three-dimensional space signal coverage requirement of terminal equipment exceeding a hemisphere can be met, and the main space area meets the circular polarization characteristic.
3. The antenna has the advantages of simple structure, easy processing, low profile, light weight, mass production and easy integration in terminal equipment because the antenna is manufactured on a dielectric substrate and the PCB technology is used.
Drawings
FIG. 1 is a three-dimensional block diagram of an endfire circularly polarized antenna of the present invention;
in the figure, 1 is a first metal floor, 2 is a second metal floor, 3 is a third metal floor, 4 is a first metallized via group, 5 is a probe, 6 is a second metallized via group, 7 is a metallized via, 8 is a printing matrix, 9 is a first dielectric plate, 10 is a second dielectric plate, 11 is a microstrip line, 13 is a circularly polarized antenna, and 14 is a mobile terminal device;
FIG. 2 is a schematic diagram of a metal via hole in an endfire circularly polarized antenna according to the present invention;
FIG. 3 is a schematic diagram of the structure of an electric dipole radiation of the present invention;
FIG. 4 is a schematic diagram of the magnetic dipole radiating structure of the present invention;
FIG. 5 is a schematic view of the underlying copper-clad area of an endfire circularly polarized antenna of the present invention;
fig. 6 is a coverage scheme of a mobile phone terminal for realizing that millimeter wave communication signals exceed hemispherical three-dimensional space by using the end-fire circularly polarized antenna (three pairs);
FIG. 7 is a graph showing the S-parameter design result of an end-fire circularly polarized antenna according to the present invention;
fig. 8 is a graph phi=90° in-plane result of the design pattern of the end-fire circularly polarized antenna of the present invention;
Detailed Description
The invention is further elucidated below in connection with the accompanying drawings.
As shown in fig. 1 and 2, the present invention is a millimeter wave end-fire circularly polarized antenna, which comprises a magnetic dipole antenna unit based on a semi-open substrate integrated waveguide resonant cavity and an electric dipole antenna unit using a substrate integrated waveguide as a feed balun, wherein the semi-open substrate integrated waveguide resonant cavity is integrated on a first dielectric plate 9, the substrate integrated waveguide is integrated on a second dielectric plate 10 as electric dipole radiation of the feed balun, the first dielectric plate 9 is an upper dielectric plate, the second dielectric plate 10 is a lower dielectric plate, and the antenna structure of the present invention is formed by laminating two dielectric plates.
When the antenna is applied to millimeter wave communication of terminal equipment, three antennas are to be installed on the upper side face, the left side face and the right side face of the terminal equipment and are used for realizing signal coverage in three directions of the upper side, the left side and the right side of the terminal equipment respectively. By means of the combination of magnetic and electric dipoles, the three-dimensional spatial signal coverage requirement of the terminal device exceeding a hemisphere can be achieved, wherein the main spatial area satisfies the circular polarization characteristic.
Fig. 3 shows an electric dipole antenna unit, the radiation of the electric dipole antenna is formed by a printed array 8, the printed array 8 feeds through a balun formed by a substrate integrated waveguide, the electric dipole antenna unit specifically comprises a second dielectric plate 10, the dielectric plate material is Taconic TLY-5, the thickness is 0.254mm, a third metal floor 3 is arranged on the upper surface of the second dielectric plate 10, a substrate integrated waveguide feeding balun is formed by a second metallized via hole group 6 contained in the second dielectric plate 10, the hole period of the second metallized via hole group 6 is 0.5mm, and the substrate integrated waveguide feeding balun is formed with the width of 4.9 mm. A microstrip line 11 is arranged on the lower surface of the second dielectric plate 10, and signals transmitted in the microstrip line 11 are coupled into the substrate integrated waveguide feed balun through the microstrip line 11 and the conversion structure. In the radiation structure, the printing array 8 which is positioned at two sides of the second dielectric plate 10 and has the same size is connected through the metallized via hole 7 to increase the working bandwidth, wherein the metallized via hole 7 is positioned at the center line of one end of the printing array 8.
Fig. 4 shows a magnetic dipole antenna unit, wherein radiation of the magnetic dipole antenna is formed by a semi-open substrate integrated waveguide resonant cavity with one open side, and specifically comprises a first dielectric plate 9, the material of which is Taconic TLY-5, the thickness of which is 1.524mm, and a first metal floor 1 and a second metal floor 2 are respectively arranged on the upper surface and the lower surface of the first dielectric plate 9. The first metallized via group 4 contained in the upper dielectric plate forms a semi-open type substrate integrated waveguide resonant cavity, the diameter of the metallized via forming the semi-open type substrate integrated waveguide resonant cavity is 0.5mm, the hole period of the first metallized via group 4 is 0.75mm, and the width of the semi-open type substrate integrated waveguide resonant cavity is 6.4mm. The semi-open substrate integrated waveguide resonant cavity is fed by a probe 5 which is positioned at the central axis of the semi-open substrate integrated waveguide resonant cavity and is 3.95mm away from the bottom edge of the resonant cavity, the probe 5 is realized by a metallized via hole with the diameter of 0.5mm, the probe is connected to a microwave adapter through a microstrip line with the width of 0.8mm and the medium thickness of 0.254mm, and all medium materials are Tacouc TLY-5.
Signals transmitted in the microstrip line are coupled into the semi-open substrate integrated waveguide resonant cavity through the probe 5. In the second metal floor 2, a hollowed area slightly larger than the projected area of the probe 5 is arranged at the position corresponding to the probe 5 so as to avoid signal short circuit.
When the magnetic dipole antenna and the electric dipole antenna are used for forming circular polarized radiation, two excitations with equal amplitude and specific phase difference are realized through the microstrip line at the output end of the one-to-two microstrip power divider, and the electric dipole antenna and the magnetic dipole antenna are excited respectively, so that the expected circular polarized end-fire effect is obtained.
As shown in fig. 6, three antennas 13 are installed on the upper side, the left side and the right side of the mobile terminal device 14 to respectively cover signals in three directions of the upper side, the left side and the right side of the terminal device. By means of the wide beam characteristic of the antenna pattern of the invention on one main surface, the three-dimensional space signal coverage requirement of the terminal equipment exceeding a hemisphere can be met, wherein the main space region meets the circular polarization characteristic.
From fig. 7, it can be seen that the simulation result of the antenna impedance bandwidth can reach about 17%, and the range from 24.75GHz to 27.5GHz of the 5G frequency band is covered. Fig. 8 is a directional diagram in the plane of antenna phi=90°, and it can be seen that the antenna has good large angle coverage capability and cross polarization level in the end-fire direction.
Claims (5)
1. A millimeter wave circularly polarized antenna for a mobile terminal, characterized by: the millimeter wave circularly polarized antenna is formed by laminating and combining a magnetic dipole antenna unit based on a semi-open substrate integrated waveguide resonant cavity and an electric dipole antenna unit taking a substrate integrated waveguide as a feed balun;
The radiation of the magnetic dipole antenna unit is formed by a semi-open substrate integrated waveguide resonant cavity with one side open, and the semi-open substrate integrated waveguide resonant cavity is fed by a probe (5);
The radiation of the electric dipole antenna unit is formed by a printing array (8), and the printing array (8) feeds through a balun formed by a substrate integrated waveguide;
The device also comprises a microstrip line, wherein two excitations with equal amplitude and specific phase difference are obtained through the microstrip line, and a magnetic dipole antenna unit and an electric dipole antenna unit are excited respectively;
the electric dipole antenna unit is provided with 2 printing arrays (8) with the same size and is connected through a metallized via hole (7).
2. A millimeter wave circularly polarized antenna for a mobile terminal as claimed in claim 1, wherein: the probes (5) are realized by metallized vias.
3. A millimeter wave circularly polarized antenna for a mobile terminal as claimed in claim 1, wherein: the magnetic dipole antenna unit comprises a first dielectric plate (9), a first metal floor (1), a second metal floor (2) and a first metallized via hole group (4) which are respectively arranged on the upper surface and the lower surface of the first dielectric plate (9), wherein the first metallized via hole group (4) is contained in the first dielectric plate (9), and the first metallized via hole group (4) forms a semi-open substrate integrated waveguide resonant cavity;
the electric dipole antenna unit further comprises a second dielectric plate (10), a third metal floor (3) arranged on the upper surface of the second dielectric plate (10) and a second metallized via hole group (6) contained in the second dielectric plate (10), wherein the second metallized via hole group (6) forms a substrate integrated waveguide feed balun;
The microstrip line (11) is accommodated on the lower surface of the second dielectric plate (10), signals transmitted in the microstrip line are coupled into the substrate integrated waveguide feed balun through the microstrip line and the conversion structure, and enter the semi-open substrate integrated waveguide resonant cavity through the probe (5).
4. A millimeter wave circularly polarized antenna for a mobile terminal as claimed in claim 3, wherein: the second metal floor (2) is provided with a hollowed-out area which is larger than the projection area of the probe (5), and the position of the hollowed-out area corresponds to the setting position of the probe (5).
5. A millimeter wave circularly polarized antenna for a mobile terminal as claimed in claim 1, wherein: installed in various orientations of the mobile terminal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479930.4A CN109742515B (en) | 2018-12-05 | 2018-12-05 | Millimeter wave circularly polarized antenna for mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479930.4A CN109742515B (en) | 2018-12-05 | 2018-12-05 | Millimeter wave circularly polarized antenna for mobile terminal |
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| Publication Number | Publication Date |
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| CN109742515A CN109742515A (en) | 2019-05-10 |
| CN109742515B true CN109742515B (en) | 2024-05-17 |
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| CN201811479930.4A Active CN109742515B (en) | 2018-12-05 | 2018-12-05 | Millimeter wave circularly polarized antenna for mobile terminal |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029762A (en) * | 2019-12-19 | 2020-04-17 | 华南理工大学 | Millimeter wave end-fire circularly polarized antenna and wireless communication equipment |
| CN113285229B (en) * | 2021-06-07 | 2022-05-20 | 南京邮电大学 | High-gain end-fire circularly polarized antenna based on artificial surface plasmon polariton |
| CN114447596B (en) * | 2022-01-25 | 2022-10-18 | 北京星英联微波科技有限责任公司 | Broadband vertical planar printed gain enhanced antenna with H-shaped resonator structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299618A (en) * | 2016-08-19 | 2017-01-04 | 四川中测微格科技有限公司 | A kind of substrate integration wave-guide plane end-fire circular polarized antenna |
| CN107978853A (en) * | 2017-10-27 | 2018-05-01 | 华南理工大学 | A kind of end-fire circle polarized millimeter wave antenna |
| CN108173008A (en) * | 2017-12-07 | 2018-06-15 | 西安电子科技大学 | A kind of novel planar omnidirectional circular-polarized antenna, radio communication base station, mobile terminal |
| CN209169379U (en) * | 2018-12-05 | 2019-07-26 | 东南大学 | A kind of millimeter wave circular polarized antenna for mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736162B (en) * | 2017-04-20 | 2020-09-08 | 惠州硕贝德无线科技股份有限公司 | Novel antenna unit suitable for 5G terminal device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299618A (en) * | 2016-08-19 | 2017-01-04 | 四川中测微格科技有限公司 | A kind of substrate integration wave-guide plane end-fire circular polarized antenna |
| CN107978853A (en) * | 2017-10-27 | 2018-05-01 | 华南理工大学 | A kind of end-fire circle polarized millimeter wave antenna |
| CN108173008A (en) * | 2017-12-07 | 2018-06-15 | 西安电子科技大学 | A kind of novel planar omnidirectional circular-polarized antenna, radio communication base station, mobile terminal |
| CN209169379U (en) * | 2018-12-05 | 2019-07-26 | 东南大学 | A kind of millimeter wave circular polarized antenna for mobile terminal |
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