Antenna array for 5G mobile phones

Abstract

This invention provides an antenna array for 5G mobile phones, relating to the field of antenna technology. It includes: a dielectric substrate, a back cover, a metal base plate, and a plurality of antenna pairs. The back 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 antenna pair is uniformly disposed on the back cover; each 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 back cover and connected; the H-shaped antenna is disposed on the lower surface of the back cover. This invention has advantages such as large-scale integration, high integration density, high channel capacity, self-decoupling, and high ECC.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to an antenna array for 5G mobile phones. Background Technology

[0002] Currently, with the development of 5G communication technology in smartphones, the demand for the number of antenna elements is constantly increasing. Data shows that the channel capacity of a 16-element antenna array is 1.95 times that of an 8-element antenna array and 6.35 times that of a 2-element array. Research indicates that the core of MIMO antenna array development for 5G smartphones lies in more antenna elements, higher isolation, and higher channel capacity.

[0003] Current smartphone antennas consist of antenna arrays with only 8, 4, or 2 elements. A limited number of antenna elements results in low antenna channel capacity, significantly impacting the peak data rate and anti-interference performance of 5G communication networks. Therefore, large-scale integration of antenna elements is a key issue.

[0004] Consumers have increasingly higher demands for various functions in smartphones. Larger batteries, larger screens, better cameras, and motors are taking up space that was originally allocated to antennas, which leads to strong coupling between highly integrated antenna array units. Summary of the Invention

[0005] The purpose of this invention is to provide an antenna array for 5G mobile phones, which has advantages such as large-scale integration, high integration degree, high channel capacity, self-decoupling and high ECC.

[0006] An antenna array for 5G mobile phones includes: a dielectric substrate, a back cover, a metal base plate, and a plurality of 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.

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

[0008] Optionally, 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.

[0009] Optionally, the feed line is connected to the loop antenna, the H-shaped antenna, and the metal base plate via a feed post.

[0010] The power supply post penetrates the dielectric substrate and the back cover.

[0011] Optionally, 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.

[0012] Optionally, 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.

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

[0014] Optionally, 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.

[0015] Optionally, 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. The effects of this invention are as follows: The present invention relates to an antenna array for 5G mobile phones that can cover the 3.4-3.6GHz band of the n78 frequency band. The antenna array integrates 16 antenna elements and can provide a channel capacity of more than 68.5bps / Hz, with an envelope correlation coefficient of less than 0.031.

[0016] The present invention relates to an antenna array for 5G mobile phones, which consists of 8 self-decoupling antenna pairs. The isolation between the loop antenna and the H-shaped antenna is better than 28dB, and the isolation of the 16-element array is better than 13dB.

[0017] This invention relates to an antenna array for 5G mobile phones. It features a novel structure, occupies little internal space in the phone, and has the characteristics of large channel capacity and high isolation. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the upper surface of the rear cover of the present invention; Figure 2 This is a structural diagram of the lower surface of the rear cover of the present invention; Figure 3 This is a structural diagram of the lower surface of the dielectric substrate of the present invention; Figure 4 This is a side view of the antenna array used in a 5G mobile phone according to the present invention; Figure 5 This is a comparison chart of the simulation and actual measurement of the S11 parameters of the antenna array used in 5G mobile phones according to the present invention.

[0019] Figure 6 This is a comparison chart of the simulation and actual measurement of the S12 parameters of the antenna array used in 5G mobile phones according to the present invention.

[0020] Figure 7 This is a comparison chart of the efficiency simulation and actual measurement of the antenna array used in 5G mobile phones according to the present invention.

[0021] Figure 8 This is a simulation diagram of the envelope correlation coefficient of the antenna array used in 5G mobile phones according to the present invention.

[0022] Figure 9 This is a comparison chart of the calculated channel capacity of the antenna array used in this invention for 5G mobile phones with the channel capacities of standard 2-element arrays and 8-element arrays.

[0023] In the diagram: 1. Back cover; 2. Dielectric substrate; 3. Loop antenna; 4. Feed line; 5. H-shaped antenna; 6. First branch; 7. Second branch; 8. Feed hole; 9. Metal hole; 10. Metal base plate; 11. Feed post; 12. Metal post. Detailed Implementation

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

[0025] Figure 1This is a structural diagram of the upper surface of the rear cover of the present invention; Figure 2 This is a structural diagram of the lower surface of the rear cover of the present invention; Figure 3 This is a structural diagram of the lower surface of the dielectric substrate of the present invention; Figure 4 This is a side view of the antenna array used in a 5G mobile phone according to the present invention. Figures 1-4 As shown, the present invention provides an antenna array for 5G mobile phones, which includes: a dielectric substrate 2, a back cover 1, a metal base plate 10, and a plurality of antenna pairs.

[0026] A back cover 1 is disposed on the upper surface of the dielectric substrate 2; a metal base plate 10 is disposed on the lower surface of the dielectric substrate 2. Specifically, in this embodiment, the dielectric substrate 2, the back cover 1, and the metal base plate 10 are all rectangular in shape. A predetermined distance is maintained between the dielectric substrate 2 and the back cover 1. Preferably, the predetermined distance is 1 mm. The metal base plate 10 has a length of 146 mm and a width of 70.3 mm. Both the back cover 1 and the dielectric substrate 2 are made of FR-4 material with a dielectric constant of 4.4 and a height of 0.8 mm.

[0027] Each antenna pair is evenly arranged on the rear cover 1.

[0028] The antenna pair includes a loop antenna 3, a feed line 4, and an H-shaped antenna 5.

[0029] The loop antenna 3 and the feed line 4 are both located on the upper surface of the rear cover 1 and are connected together; the H-shaped antenna 5 is located on the lower surface of the rear cover 1.

[0030] Specifically, the loop antenna includes a first bent microstrip line, a second bent microstrip line, and an open resonant ring.

[0031] 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.

[0032] The open-loop 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.

[0033] 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.

[0034] 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.

[0035] 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.

[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. 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; 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.

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 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.

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

5. 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.

6. The antenna array for 5G mobile phones according to claim 1, 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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