Metal frame zero-clearance millimeter wave mobile phone antenna

Abstract

The invention relates to the technical field of mobile phone antennas, and discloses a metal frame zero-clearance millimeter wave mobile phone antenna, which comprises a metal frame; wherein the metal frame is provided with a rectangular window; a block of dielectric material; laminating the circuit board; wherein the laminated circuit board comprises an upper-layer metal surface, a lower-layer metal surface, an upper-layer dielectric substrate, a lower-layer dielectric substrate, a cementing layer, a feeder line, a metalized blind hole and a metalized through hole, and the part, comprising the metalized blind hole, of the laminated circuit board is arranged in the rectangular window. And the cementing layer and the feeder line are arranged between the upper dielectric substrate and the lower dielectric substrate. And the metalized blind hole and the upper dielectric substrate are arranged in a penetrating manner. The metal frame, the dielectric material block and the laminated circuit board are conformal, integrated design is achieved, the two antennas are combined and excited at the same time to form the complementary source antenna, the working bandwidth is greatly widened, and the performance of the whole antenna is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mobile phone antennas, and in particular to a metal frame zero-clearance millimeter wave mobile phone antenna. Background Art

[0002] Most of today's smartphones have compact internal structures and basically use metal frames. Therefore, mobile phone millimeter wave antennas need to solve the radiation blocking problem caused by metal frames and achieve miniaturization of antenna structures. Currently, existing designs for this purpose can be roughly divided into two categories.

[0003] The first method is to set a gap on the metal frame and set a probe or microstrip line feeding structure at the gap. However, this structure will affect the appearance of the mobile phone, and the feeding structure at the gap will have a strong coupling with other surrounding circuits or devices. Therefore, a certain clearance area must be reserved near the feeding structure, resulting in a waste of space.

[0004] The second method is to package the millimeter wave antenna and the RF transceiver chip into an integrated structure. This type of antenna is more expensive and has low radiation efficiency.

[0005] Therefore, we propose a metal frame zero-clearance millimeter-wave mobile phone antenna to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a metal frame zero-clearance millimeter wave mobile phone antenna to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a metal frame zero clearance millimeter wave mobile phone antenna, comprising:

[0008] Metal frame;

[0009] Wherein, the metal frame has a rectangular window arrangement;

[0010] A block of dielectric material;

[0011] Laminated circuit board: upper metal surface, lower metal surface, upper dielectric substrate, lower dielectric substrate, adhesive layer, feeder, metallized blind hole, metallized through hole, wherein part of the laminated circuit board including the metallized blind hole is arranged inside the rectangular window.

[0012] According to the above technical solution, the adhesive layer and the feeder are arranged between the upper dielectric substrate and the lower dielectric substrate.

[0013] According to the above technical solution, the metallized blind hole is arranged to penetrate the upper dielectric substrate.

[0014] According to the above technical solution, the metallized through hole is arranged through the upper dielectric substrate and the lower dielectric substrate.

[0015] According to the above technical solution, the feeder line, the metallized blind hole and the metal frame are connected in series, and the metallized blind hole and the rectangular window are repeatedly used as radiation units.

[0016] According to the above technical solution, the height of the metallized blind hole and the length of the rectangular window determine the high and low matching frequency points to broaden the matching bandwidth, and the height of the metallized blind hole and the length of the rectangular window are adjustable.

[0017] According to the above technical solution, the shape of the metallized blind hole can be any one of rectangular, circular, elliptical, annular, and equivalent deformation.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention is applied to the field of mobile phone communications, and can be applied to the receiving and transmitting devices of mobile phone communication systems in the millimeter wave frequency band. The present invention adopts a quasi-coaxial transmission structure, which can avoid coupling with surrounding structures and can be integrated with a radio frequency integrated circuit. Benefiting from the present invention, the antenna design is integrated with the metal frame, which can achieve a more compact and simple structure and save space inside the mobile phone. The metal frame, dielectric material block and laminated circuit board adopted by the present invention are conformal, and an integrated design is achieved. By combining the two antennas and simultaneously exciting them to form a complementary source antenna, the working bandwidth is greatly widened and the performance of the overall antenna is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a 3D view of the metal frame antenna of the present invention:

[0021] Figure 2 is a side view of the metal frame antenna of the present invention;

[0022] Figure 3 is a side view of the metal frame antenna laminate circuit board of the present invention;

[0023] Figure 4 is a top view of the metal frame antenna laminate circuit board of the present invention;

[0024] Figure 5 It is a reflection coefficient simulation curve diagram of a specific embodiment of the metal frame antenna of the present invention;

[0025] Figure 6 is a gain simulation curve diagram of a specific embodiment of the metal frame antenna of the present invention;

[0026] Figure 7It is a schematic diagram of the normalized radiation pattern of the main polarization and cross polarization of the E-plane at 29.5 GHz of a specific embodiment of the metal frame antenna of the present invention;

[0027] Figure 8 It is a schematic diagram of the normalized radiation pattern of the main polarization and cross polarization of the H plane at 29.5 GHz of a specific embodiment of the metal frame antenna of the present invention; DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The present invention provides a technical solution:

[0030] See also Figure 1 In this embodiment, the height of the metal frame 1 is 6 mm. Figure 2 In this embodiment, a rectangular window 2 with a size of 1.789 mm × 4.3 mm is located at the side frame of the metal frame 1. The length of the rectangular window 2 can be used to adjust the resonant frequency at the low frequency. The dielectric material block 3 is placed in the rectangular window 2. A laminated circuit board 4 is placed at the rear end of the dielectric material block 3. The laminated circuit board 4 is provided with an upper metal surface 5, an upper dielectric substrate 7, a feed line 10, an adhesive layer 8, a lower dielectric substrate 9, a lower metal surface 6 and a radio frequency integrated circuit 13 from top to bottom.

[0031] See also Figure 3 In this embodiment, the thickness of the upper metal surface 5, the feeder 10 and the lower metal surface 6 are all 0.013 mm, the thickness of the upper dielectric substrate 7 is 1.52 mm, the thickness of the adhesive layer 8 is 0.1 mm, and the thickness of the lower dielectric substrate 9 is 0.13 mm. The metallized blind hole 11 penetrates the upper dielectric substrate 7 and is connected to the upper metal surface 5 and the feeder 10. The diameter of the metallized blind hole 11 is 0.3 mm and the height is 1.52 mm. Its height can be used to adjust the resonant frequency at high frequencies. The metallized through hole 12 surrounding the feeder 10 penetrates the upper dielectric substrate 7, the adhesive layer 8, and the lower dielectric substrate 9. The diameter of a single metallized through hole 12 is 0.3 mm.

[0032] See also Figure 4In this embodiment, a dielectric material block 3 with a thickness of 1.5 mm is placed in a rectangular window 2 on a side frame of a metal frame 1 with a thickness of 4 mm, and a laminated circuit board 4 is placed at a distance of 0.2 mm from the rear end thereof. The laminated circuit board 4 comprises an upper metal surface 5, an upper dielectric substrate 7, a bonding layer 8, a lower dielectric substrate 9 and a lower metal surface 6. A feeder line 10 is placed between the upper dielectric substrate 7 and the bonding layer 8. The length of the feeder line 10 is 2.55 mm, and the two widths are 0.5 mm and 0.8 mm respectively. The starting end of the feeder line 10 is connected to a radio frequency transceiver chip 13, and the end is connected to a metalized blind hole 11. A metalized through hole 12 is placed next to the feeder line 10 to reduce transmission loss.

[0033] See also Figure 5 The working bandwidth of the millimeter wave metal frame mobile phone antenna simulation of the embodiment of the present invention is 16.41%, the high resonance frequency is located at 30.75GHz, and the low frequency resonance point is located at 28GHz. Figure 6 The maximum gain of the millimeter wave metal frame mobile phone antenna in the embodiment of the present invention within the working bandwidth is 6.7dBi, and the center gain within the working bandwidth is higher than 6.2dBi. Figure 7 and Figure 8 The normalized radiation pattern of the millimeter-wave metal frame mobile phone antenna of the embodiment of the present invention at 29.5GHz has a maximum radiation direction in front of the rectangular window, and the H-plane half-power beam width is -36.32° to 36.52°. At the same time, the vertical polarization (main polarization) field of the antenna is more than 30dB larger than the horizontal polarization (cross polarization) field, indicating that the antenna generates vertical polarization radiation.

[0034] Working principle: The metallized through hole 12 beside the feed line 10 connects the upper and lower metal layers of the dielectric substrate to form a closed space, avoiding the coupling of the feed line 10 with the surrounding circuits or devices, so that the antenna has a zero clearance characteristic. The metallized blind hole 11 is connected to the feed line 10, which generates vertical polarized radiation at a high frequency of 30.75GHz, and the metal frame 1 generates vertical polarized radiation at a low frequency of 28GHz. The frequency of the high-frequency resonance point can be changed by adjusting the height of the metallized blind hole 11, and the frequency of the low-frequency resonance point can be changed by adjusting the long side of the rectangular window 2 on the metal frame 1. Adjusting the diameter of the metallized blind hole 11 will affect the impedance matching degree of high and low frequencies at the same time. Adjusting the width of the feed line 10, the thickness of the lower dielectric substrate 9, and the distance between the metallized through hole 12 and the feed line 10 can change the equivalent impedance of the feeding structure.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metal frame zero clearance millimeter wave mobile phone antenna, characterized in that: include: Metal frame (1); Wherein, the metal frame (1) has a rectangular window (2); A block of dielectric material (3); The dielectric material block (3) is located inside the rectangular window (2) etched on the metal frame and is used to fill the window so that the window appears seamless in appearance; Laminated circuit board (4); Part of the laminated circuit board (4) extends into the interior of the rectangular window (2) and is located at a certain distance behind the dielectric material block (3); the laminated circuit board (4) comprises an upper metal surface (5), a lower metal surface (6), an upper dielectric substrate (7), an adhesive layer (8), a lower dielectric substrate (9), a feeder line (10), a metallized blind hole (11), and a metallized through hole (12); the part of the laminated circuit board (4) including the metallized blind hole (11) is arranged inside the rectangular window (2).

2. The metal frame zero clearance millimeter wave mobile phone antenna according to claim 1, characterized in that: The adhesive layer (8) and the feeder line (10) are arranged between the upper dielectric substrate (7) and the lower dielectric substrate (9).

3. The metal frame zero clearance millimeter wave mobile phone antenna according to claim 2, characterized in that: The metalized blind hole (11) is arranged to penetrate the upper dielectric substrate (7).

4. The metal frame zero clearance millimeter wave mobile phone antenna according to claim 3, characterized in that: The metallized through hole (12) is arranged to penetrate the upper dielectric substrate (7), the adhesive layer (8), and the lower dielectric substrate (9), and together with the upper metal surface (5), the lower metal surface (6), and the feed line (10) form a quasi-coaxial transmission structure, which can ultimately be connected to the radio frequency transceiver chip (13).

5. The metal frame zero clearance millimeter wave mobile phone antenna according to claim 4, characterized in that: The feed line (10), the metallized blind hole (11) and the metal frame (1) are connected in series, and the metallized blind hole (11) and the rectangular window (2) together serve as a radiation structure.

6. The metal frame zero-clearance millimeter wave mobile phone antenna according to claim 5, characterized in that: The height of the metallized blind hole (11) and the length of the rectangular window (2) determine the high and low matching frequency points to broaden the matching bandwidth, and the height of the metallized blind hole (11) and the length of the long side of the rectangular window (2) are adjustable.

7. The metal frame zero-clearance millimeter wave mobile phone antenna according to claim 6, characterized in that: The dielectric constant and dielectric loss of a block of dielectric material can be varied.

8. The metal frame zero-clearance millimeter wave mobile phone antenna according to claim 7, characterized in that: The shape of the metallized blind hole (11) can be any one of a rectangle, a circle, an ellipse, a ring, or an equivalent deformation.

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