Patent Application
20200052382
The present disclosure relates to the field of wireless communication technologies, and in particular, to an antenna system and a mobile terminal.
With 5G being the focus of research and development in the global industry, developing 5G technologies and formulating 5G standards have become the industry consensus. The ITU-RWP5D 22nd meeting held in June 2015 by International Telecommunication Union (ITU) identified three main application scenarios for 5G: enhance mobile broadband, large-scale machine communication, and highly reliable low-latency communication. These three application scenarios respectively correspond to different key indicators, and in the enhance mobile broadband scenario, the user peak speed is 20 Gbps and the minimum user experience rate is 100 Mbps. The high carrier frequency and large bandwidth characteristics unique to the millimeter wave are the main means to achieve 5G ultra-high data transmission rates.
The rich bandwidth resources of the millimeter wave band provide a guarantee for high-speed transmission rates. However, due to the severe spatial loss of electromagnetic waves in this frequency band, wireless communication systems using the millimeter wave band need to adopt an architecture of a phased array. The phases of respective array elements are caused to distribute according to certain regularity by a phase shifter, so that a high gain beam is formed and the beam is scanned over a certain spatial range through a change in phase shift.
The metal frame architecture is the mainstream solution in mobile phone structural design, providing better protection, aesthetics, thermal dissipation and user experience. However, due to the shielding effect of metal on electromagnetic waves, the radiation performance of the upper and lower antennas will be seriously affected, and the gain of the antenna will be reduced.
Therefore, it is necessary to provide a new antenna system to solve the above problems.
Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
The present disclosure will be further illustrated with reference to the accompanying drawings and the embodiments.
Referring to
The metal frame 60 includes a first corner 61 and a second corner 62 disposed diagonally, a first long frame 63 and a first short frame 64 that are respectively connected to two ends of the first corner 61, a second long frame 65 and a second short frame 66 that are respectively connected to two ends of the second corner 62. The first long frame 63 and the second long frame 65 are arranged opposite to each other. The first short frame 64 and the second short frame 66 are arranged opposite to each other. The first long frame 63 and the first short frame 64 are connected by the first corner 61. The second long frame 65 and the second short frame 66 are connected by the second corner 62. The first long frame 63 and the second short frame 66 are connected by a third corner 67 that is on the same side as the first corner 61. The second long frame 65 and the first short frame 64 are connected by a fourth corner 68 that is at the same end as the first corner 61.
In this embodiment, the first corner 61 is located at an upper left corner of the mobile terminal 100. The second corner 62 is located at a lower right corner of the mobile terminal 100. The third corner 67 is located at a lower left corner of the mobile terminal 100.
The fourth corner 68 is located at an upper right corner of the mobile terminal. The upper left corner, the lower right corner, the lower left corner, and the upper right corner above are all shown by being viewed in the perspective of
The antenna system includes four SIW horn antenna arrays 71 formed on the metal frame 60, i.e., a first SIW horn antenna array 71a, a second SIW horn antenna array 71b, a third SIW horn antenna array 71c, and a fourth SIW horn antenna array 71d. Specifically, the circumferential sides of the first corner 61 and the second corner 62 are respectively provided with two SIW horn antenna arrays arranged perpendicular to each other. The first SIW horn antenna array 71a is provided at an end of the first long frame 63 close to the first corner 61.
The second SIW horn antenna array 71b is provided at an end of the first short frame 64 close to the first corner 61. The third SIW horn antenna array 71c is provided at an end of the second long frame 65 close to the second corner 62. The fourth SIW horn antenna array 71d is provided at one end of the second short frame 66 close to the second corner 62. The mobile terminal 100 has a top and a bottom, and the top and bottom are arranged opposite to each other along a length direction of the mobile terminal 100. Four SIW horn antenna arrays are densely distributed on the frame at the corners at the top and bottom of the mobile terminal, thereby reducing the line loss from the RF front end (RFFE) to the antenna unit.
Referring to
In this embodiment, the SIW horn antenna array 71 operates in a millimeter wave band.
In the present embodiment, specifically, each of the SIW horn antenna arrays 71 includes four SIW horns 711 and four phase shifters 2 electrically connected to the four SIW horns 711, respectively. The four SIW horns of the first SIW horn antenna array 71a are arranged in an array along a direction parallel to the first long frame 63. The four SIW horns of the second SIW horn antenna array 71b are arranged in an array along a direction parallel to the first short frame 64. The four SIW horns of the third SIW horn antenna array 71c are arranged in an array along a direction parallel to the second long frame 65. The four SIW horns of the fourth SIW horn antenna array 71d are arranged in an array along a direction parallel to the second short frame 66.
The phase shifter 2 has a specification of 5 bits and the phase shift accuracy thereof is 11.25°.
The metal frame 60 is provided with multiple spaced through holes 80 at positions corresponding to the SIW horns 711, and the through hole 80 penetrates the outer surface and the inner surface of the metal frame 60. Each of the SIW horns 711 is fixedly clamped in one of the through holes 80 correspondingly and electrically connected to the metal frame 60. In view of the aesthetics of the mobile terminal 100, it is necessary to minimize the gap between the SIW horn 711 and the through hole 80.
In this embodiment, the through hole 80 has a rectangular shape, and the cross sectional area of the SIW horn 711 is 2×3 mm. The through hole 211 has a cross sectional area of 2×3.5 mm. Without doubt, the shape of the through hole 80 is not limited thereto, and may be a circular, elliptical or the like, all of which are possible.
The antenna system further includes a system ground unit 1, and the system ground unit 1 is directly provided on the main board 80. The system ground unit feeds the SIW horn antenna array with power through the SIW horn, and this feeding mode can achieve direct connection between the SIW horn 711 and the system ground unit 1, which is advantageous for integration.
Based on the above structure, referring to
Compared with the related art, the antenna system and the mobile terminal provided by the present disclosure have the following beneficial effects:
1. The four arrays of antennas of the antenna system cooperate with each other to achieve beam coverage of 5 dB in the omni-directional space, such that the antenna system has good overall coverage efficiency, thereby improving the stability of the signal of the mobile terminal;
2. The antenna system is provided on the metal frame of the mobile terminal, which saves the internal space of the mobile terminal;
3. The antenna system adopts the SIW structure for feeding power, such that direct connection between the antenna and the main board can be achieved, which is beneficial for integration;
4. The antenna system adopts a linear array, occupies a small space and only one perspective needs to be scanned, which simplifies design difficulty, test difficulty, and beam management complexity;
5. The four arrays of antennas of the antenna system are densely distributed on the frame at the corners of the mobile terminal, which reduces the line loss from the RF front end to the antenna unit and improves the receiving efficiency.
What have been described above are only embodiments of the present disclosure, and it should be noted herein that one ordinary person skilled in the art can make improvements without departing from the inventive concept of the present disclosure, but these are all within the scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201810912502.X | Aug 2018 | CN | national |
