Antenna array for 5G mobile phone

Abstract

The invention provides an antenna array for a 5G mobile phone, which relates to the technical field of antennas and comprises a dielectric substrate, a rear cover, a metal bottom plate and a plurality of antenna pairs, the rear cover is arranged on the upper surface of the dielectric substrate; the metal bottom plate is arranged on the lower surface of the dielectric substrate; the antenna pairs are uniformly arranged on the rear cover; the antenna pair comprises a loop antenna, a feeder line and an H-shaped antenna; the loop antenna and the feeder line are arranged on the upper surface of the rear cover and are connected; the H-shaped antenna is arranged on the lower surface of the rear cover. The invention has the advantages of large-scale integration, high integration level, high channel capacity, self-decoupling, high ECC and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to an antenna array for a 5G mobile phone. BACKGROUND

[0002] At present, with the development of 5G communication technology of smart phones, the demand for the number of antenna units is also increasing. According to the data, the channel capacity of a 16-unit antenna array is 1.95 times that of an 8-unit antenna array and 6.35 times that of a 2-unit array. Research shows that the core of the development of 5G smart phone MIMO antenna array is more antenna units, high isolation, and high channel capacity.

[0003] The existing smart phone antenna has only an 8-unit, 4-unit or 2-unit antenna array. The small number of antenna units will result in low antenna channel capacity, which has a great influence on the peak rate and anti-interference performance of 5G communication network transmission. Therefore, large-scale integration of antenna units is a key problem.

[0004] Consumers have higher and higher demands for various functions of smart phones, and larger batteries, larger screens, better cameras and motors occupy the space originally allocated to the antenna, which will cause strong coupling between highly integrated antenna array units. SUMMARY

[0005] The purpose of the present application is to provide an antenna array for a 5G mobile phone, which has the advantages of large-scale integration, high integration, high channel capacity, self-decoupling and high ECC.

[0006] An antenna array for a 5G mobile phone comprises a dielectric substrate, a back cover, a metal bottom plate and a plurality of antenna pairs. The back cover is arranged on the upper surface of the dielectric substrate, and the metal bottom plate is arranged on the lower surface of the dielectric substrate. Each of the antenna pairs is uniformly arranged on the back cover. The antenna pair comprises a ring-shaped antenna, a feed line and an H-shaped antenna. The ring-shaped antenna and the feed line are both arranged on the upper surface of the back cover and are connected.

[0007] Optionally, the dielectric substrate, the back cover and the metal bottom plate are all rectangular in shape.

[0008] Optionally, the H-shaped antenna comprises a first branch, a second branch and a third branch. The first branch and the second branch are parallel, the first branch and the second branch are connected through the third branch, and the third branch is perpendicular to the first branch. The length of the first branch is greater than the length of the second branch.

[0009] Optionally, the feeding lines are connected to the annular antenna, the H-shaped antenna and the metal bottom plate through feeding columns respectively.

[0010] The feeding columns penetrate the dielectric substrate and the back cover.

[0011] Optionally, the annular antenna and the H-shaped antenna are connected to the metal bottom plate through metal columns. The metal columns penetrate the dielectric substrate and the back cover.

[0012] Optionally, the annular antenna comprises a first bent microstrip line, a second bent microstrip line and an open resonant ring. The first bent microstrip line comprises a first microstrip branch and a second microstrip branch, and the second bent microstrip line comprises a third microstrip branch and a fourth microstrip branch. The open resonant ring comprises a first connecting arm, a second connecting arm, an upper arm, a first lower arm and a second lower arm. The first end of the upper arm is connected to the first end of the first connecting arm perpendicularly, and the second end of the upper arm is connected to the first end of the second connecting arm perpendicularly. The second end of the first connecting arm is connected to the first end of the first lower arm perpendicularly, and the second end of the second connecting arm is connected to the first end of the second lower arm perpendicularly. The first end of the first microstrip branch is connected to the first end of the first lower arm perpendicularly, and the second end of the first microstrip branch is connected to the second microstrip branch perpendicularly. The first end of the third microstrip branch is connected to the second end of the second lower arm perpendicularly, and the second end of the third microstrip branch is connected to the fourth microstrip branch perpendicularly.

[0013] Optionally, a distance is set between the dielectric substrate and the back cover.

[0014] Optionally, the number of the antenna pairs is 8. Each long side of the back cover is provided with three antenna pairs, and each short side of the back cover is provided with one antenna pair.

[0015] Optionally, the width of the first lower arm is equal to the width of the second lower arm. The width of the upper arm is greater than the width of the first lower arm. The effects of the present application are as follows: The application is an antenna array for 5G mobile phones, which can cover the 3.4-3.6GHz of n78 frequency band, integrates 16 antenna units, can provide a channel capacity of more than 68.5bps / Hz, and has an envelope correlation coefficient of less than 0.031.

[0016] The application is an antenna array for 5G mobile phones, which is composed of 8 self-decoupling antenna pairs, has an isolation degree between the ring-shaped antenna and the H-shaped antenna of better than 28dB, and has an isolation degree of the 16-unit array of better than 13dB.

[0017] The application is an antenna array for 5G mobile phones, which has the characteristics of novel structure, less occupation of internal space of the mobile phone, large channel capacity and high isolation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure diagram of the upper surface of the rear cover of the application; Figure 2 is a structure diagram of the lower surface of the rear cover of the application; Figure 3 is a structure diagram of the lower surface of the medium substrate of the application; Figure 4 is a side view of the antenna array for 5G mobile phones of the application; Figure 5 is a comparison diagram of S11 parameter simulation and actual measurement of the antenna array for 5G mobile phones of the application.

[0019] Figure 6 is a comparison diagram of S12 parameter simulation and actual measurement of the antenna array for 5G mobile phones of the application.

[0020] Figure 7 is a comparison diagram of efficiency simulation and actual measurement of the antenna array for 5G mobile phones of the application.

[0021] Figure 8 is a simulation diagram of the envelope correlation coefficient of the antenna array for 5G mobile phones of the application.

[0022] Figure 9 is a comparison diagram of the calculated channel capacity of the antenna array for 5G mobile phones of the application and the channel capacity of the standard 2-unit array and 8-unit array.

[0023] In the figure: 1, rear cover; 2, medium substrate; 3, ring-shaped antenna; 4, feeding line; 5, H-shaped antenna; 6, first branch; 7, second branch; 8, feeding hole; 9, metal hole; 10, metal bottom plate; 11, feeding column; 12, metal column. DETAILED DESCRIPTION

[0024] Hereinafter, the embodiments of the application will be described with reference to the accompanying drawings.

[0025] Figure 1is a structure diagram of the upper surface of the rear cover of the application; Figure 2 is a structure diagram of the lower surface of the rear cover of the application; Figure 3 is a structure diagram of the lower surface of the medium substrate of the application; Figure 4 is a side view of an antenna array for a 5G mobile phone. As shown in the figure, the application provides an antenna array for a 5G mobile phone, which comprises a medium substrate 2, a rear cover 1, a metal bottom plate 10 and a plurality of antenna pairs. Figures 1-4 The rear cover 1 is arranged on the upper surface of the medium substrate 2; the metal bottom plate 10 is arranged on the lower surface of the medium substrate 2. Specifically, in this embodiment, the shapes of the medium substrate 2, the rear cover 1 and the metal bottom plate 10 are all rectangular. A distance is set between the medium substrate 2 and the rear cover 1. Preferably, the distance is 1 mm. The length of the metal bottom plate 10 is 146 mm, and the width is 70.3 mm. The materials of the rear cover 1 and the medium substrate 2 are both FR-4, with a dielectric constant of 4.4 and a height of 0.8 mm.

[0026] Each antenna pair is uniformly arranged on the rear cover 1.

[0027] The antenna pair comprises a ring-shaped antenna 3, a feed line 4 and an H-shaped antenna 5.

[0028] The ring-shaped antenna 3 and the feed line 4 are both arranged on the upper surface of the rear cover 1 and are connected; the H-shaped antenna 5 is arranged on the lower surface of the rear cover 1.

[0029] Specifically, the ring-shaped antenna comprises a first bent microstrip line, a second bent microstrip line and an open resonant ring.

[0030] The first bent microstrip line comprises a first microstrip branch and a second microstrip branch, and the second bent microstrip line comprises a third microstrip branch and a fourth microstrip branch.

[0031] The open resonant ring comprises a first connecting arm, a second connecting arm, an upper arm, a first lower arm and a second lower arm.

[0032] The first end of the upper arm is vertically connected with the first end of the first connecting arm; the second end of the upper arm is vertically connected with the first end of the second connecting arm. The second end of the first connecting arm is vertically connected with the first end of the first lower arm, and the second end of the second connecting arm is vertically connected with the first end of the second lower arm.

[0033] The first end of the first microstrip branch is vertically connected with the first end of the first lower arm, and the second end of the first microstrip branch is vertically connected with the second microstrip branch.

[0034] The first end of the third microstrip branch is vertically connected with the second end of the second lower arm, and the second end of the third microstrip branch is vertically connected with the fourth microstrip branch.

[0035] The first end of the third microstrip branch is vertically connected with the second end of the second lower arm, and the second end of the third microstrip branch is vertically connected with the fourth microstrip branch.

[0036] The width of the first and second forearms is equal; the width of the upper arm is greater than the width of the first forearm.

[0037] Both the first and second bent microstrip lines have a bent structure. The bent first and second bent microstrip lines provide sufficient installation space for the lens module.

[0038] Furthermore, the open-circuit resonator has a length of 35.8 mm and a width of 4.5 mm. The first, second, third, and fourth microstrip branches each have a length of 3.2 mm and a width of 0.5 mm.

[0039] Preferably, the H-shaped antenna 5 includes a first branch 6, a second branch 7, and a third branch.

[0040] The first branch 6 and the second branch 7 are parallel; the first branch 6 and the second branch 7 are connected by a third branch; the third branch is perpendicular to the first branch 6.

[0041] The length of the first branch 6 is greater than the length of the second branch 7. Specifically, the first branch 6 is 15mm long and 0.5mm wide; the second branch 7 is 5.2mm long and 0.5mm wide. The purpose of making the first branch 6 longer than the second branch 7 is to enhance the coupling capability between the loop antenna 3 and the H-shaped antenna 5.

[0042] Specifically, the feed line 4 is connected to the loop antenna 3 and the H-shaped antenna 5 via the feed post 11 and to the metal base plate 10 respectively.

[0043] The power supply post 11 penetrates the dielectric substrate 2 and the back cover 1. Preferably, the dielectric substrate 2 and the back cover 1 are provided with through and coaxial power supply holes 8; the power supply post 11 is disposed in the power supply hole 8.

[0044] The loop antenna 3 and the H-shaped antenna 5 are connected to the metal base plate 10 via the metal pillar 12.

[0045] The metal pillar 12 penetrates the dielectric substrate 2 and the back cover 1. Preferably, the dielectric substrate 2 and the back cover 1 are provided with through and coaxial metal holes 9; the metal pillar 12 is disposed within the metal hole 9. The diameter of the metal hole 9 and the feed hole 8 are both 0.5 mm, and the height is both 2.3 mm. The metal hole 9 and the feed hole 8 are used for feeding and exciting in-phase and out-of-phase mode currents to achieve self-decoupling.

[0046] Preferably, in this embodiment, the number of antenna pairs is 8.

[0047] The long side of the back cover 1 is equipped with 3 antenna pairs; the short side of the back cover 1 is equipped with 1 antenna pair.

[0048] A ring structure is etched on the upper surface of a PCB board with a thickness of 0.8mm, and an H-shaped structure is etched on the lower surface. The entire back cover 1 has a size of 150mm x 75mm x 0.8mm. The power supply point is not covered with tin. At the same time, the same etching technology is used to etch a metal base plate 10 on the lower surface of a dielectric substrate 2 with a size of 150mm x 75mm x 0.5mm.

[0049] The antenna array of this invention was simulated using the electromagnetic simulation software ANSYS Electronics Desktop 2022.R1. After simulation debugging, the physical prototype was fabricated and tested. The S-parameter results are as follows: Figure 5 As shown, from Figure 5 As can be seen, both simulation and test results cover the 3.4-3.6 GHz frequency band of n78. From... Figure 5 As can be seen, the measured resonant point of the antenna part has a slight shift. This is because the antenna's manufacturing process and welding errors caused the resonant point to shift.

[0050] like Figure 6 and Figure 7 The simulated and measured parameters of the antenna array S12 and efficiency are shown. The 16-element antenna array maintains an isolation of better than 13dB and has an efficiency of 40.2%-73.6%.

[0051] like Figure 8 The calculated envelope correlation coefficient of the antenna array shown is as follows: the 16-element antenna array exhibits an envelope correlation coefficient of less than 0.031, indicating low correlation between antenna elements.

[0052] like Figure 9 The comparison chart of the calculated channel capacity of the antenna array shown is compared with the channel capacity of the standard 2-element array and 8-element array. It can be seen that the channel capacity of the large-scale 16-element antenna array is 5.95 times that of the 2-element array and 1.48 times that of the 8-element array. The published large-scale 16-element antenna array has excellent channel capacity.

[0053] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An antenna array for 5G mobile phones, characterized in that, It includes: Dielectric substrate, back cover, metal base plate and several antenna pairs; The rear cover is disposed on the upper surface of the dielectric substrate; The metal base plate is disposed on the lower surface of the dielectric substrate; Each of the antenna pairs is evenly arranged on the rear cover; The antenna pair includes a loop antenna, a feed line, and an H-shaped antenna; The loop antenna and the feed line are both disposed on the upper surface of the rear cover and connected together; the H-shaped antenna is disposed on the lower surface of the rear cover.

2. The antenna array for 5G mobile phones according to claim 1, characterized in that, The dielectric substrate, the back cover, and the metal base plate are all rectangular in shape.

3. The antenna array for 5G mobile phones according to claim 1, characterized in that, The H-shaped antenna includes a first branch, a second branch, and a third branch; The first branch and the second branch are parallel; the first branch and the second branch are connected by the third branch; the third branch is perpendicular to the first branch; The length of the first branch is greater than the length of the second branch.

4. The antenna array for 5G mobile phones according to claim 1, characterized in that, The feed line is connected to the loop antenna, the H-shaped antenna and the metal base plate respectively through the feed column; The power supply post penetrates the dielectric substrate and the back cover.

5. The antenna array for 5G mobile phones according to claim 1, characterized in that, The loop antenna and the H-shaped antenna are connected to the metal base plate via metal pillars; The metal pillar penetrates the dielectric substrate and the back cover.

6. The dielectric substrate and the back cover are provided with through metal vias.

7. The antenna array for 5G mobile phones according to claim 1, characterized in that, The loop antenna includes a first bent microstrip line, a second bent microstrip line, and an open resonant ring; The first bent microstrip line includes a first microstrip branch and a second microstrip branch, and the second bent microstrip line includes a third microstrip branch and a fourth microstrip branch; The open resonant ring includes a first connecting arm, a second connecting arm, an upper arm, a first lower arm, and a second lower arm; The first end of the upper arm is perpendicularly connected to the first end of the first connecting arm; the second end of the upper arm is perpendicularly connected to the first end of the second connecting arm. The second end of the first connecting arm is perpendicularly connected to the first end of the first lower arm, and the second end of the second connecting arm is perpendicularly connected to the first end of the second lower arm; The first end of the first microstrip branch is perpendicularly connected to the first end of the first lower arm, and the second end of the first microstrip branch is perpendicularly connected to the second microstrip branch. The first end of the third microstrip branch is perpendicularly connected to the second end of the second lower arm, and the second end of the third microstrip branch is perpendicularly connected to the fourth microstrip branch.

8. The antenna array for 5G mobile phones according to claim 1, characterized in that, A predetermined distance is set between the dielectric substrate and the back cover.

9. The antenna array for 5G mobile phones according to claim 2, characterized in that, The number of antenna pairs is 8; The long side of the rear cover is provided with 3 antenna pairs; the short side of the rear cover is provided with 1 antenna pair.

10. The antenna array for a 5G mobile phone according to claim 6, characterized in that, The widths of the first lower arm and the second lower arm are equal; The width of the upper arm is greater than the width of the first lower arm.

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