Metal frame zero-clearance millimeter wave mobile phone antenna

Abstract

The application 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; the metal frame is provided with a rectangular window; a dielectric material block; and a laminated circuit board; the laminated circuit board comprises an upper metal surface, a lower metal surface, an upper dielectric substrate, a lower dielectric substrate, a glue layer, a feeding line, a metalized blind hole and a metalized through hole; the part of the laminated circuit board comprising the metalized blind hole is arranged in the interior of the rectangular window; the glue layer and the feeding 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 mode. The metal frame, the dielectric material block and the laminated circuit board are conformal, integrated design is realized, two kinds of antenna groups are combined, a complementary source antenna is formed by simultaneous excitation, the working bandwidth is greatly widened, and the performance of the overall antenna is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a metal frame zero-clearance millimeter wave mobile phone antenna. BACKGROUND

[0002] Most of the current smart phones have compact internal structures and are basically provided with metal frames, so that the millimeter wave mobile phone antenna needs to solve the radiation blockage problem caused by the metal frame and realize the miniaturization of the antenna structure, at present, the existing design for the same is roughly divided into two categories.

[0003] The first kind is to set a gap on the metal frame and set a probe or microstrip line feeding structure at the gap, but this structure will affect the appearance of the mobile phone, and the feeding structure at the gap is strongly coupled with other circuits or devices around, so a certain clearance area needs to be reserved near the feeding structure, causing waste of space.

[0004] The second kind is to package the millimeter wave antenna and the radio frequency transceiver chip into an integrated structure, which is high in cost and low in radiation efficiency.

[0005] Therefore, the application provides a metal frame zero-clearance millimeter wave mobile phone antenna to solve the above problems. SUMMARY

[0006] The application aims to provide a metal frame zero-clearance millimeter wave mobile phone antenna to solve the problems in the background art.

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

[0008] A metal frame;

[0009] The metal frame has a rectangular window.

[0010] A dielectric material block;

[0011] A laminated circuit board: an upper metal surface, a lower metal surface, an upper dielectric substrate, a lower dielectric substrate, a glue layer, a feeding line, a metalized blind hole and a metalized via, wherein part of the laminated circuit board including the metalized blind hole is arranged inside the rectangular window.

[0012] According to the above technical scheme, the glue layer and the feeding line are arranged between the upper dielectric substrate and the lower dielectric substrate.

[0013] According to the above technical scheme, the metalized blind hole and the upper dielectric substrate are arranged in a penetrating manner.

[0014] According to the above technical scheme, the metalized via and the upper dielectric substrate and the lower dielectric substrate are arranged in a penetrating manner.

[0015] According to the above technical solution, the feeding 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-low matching frequency point to expand the matching bandwidth, and the height of the metallized blind hole and the length of the rectangular window can be adjusted.

[0017] According to the above technical solution, the shape of the metallized blind hole can be one of a rectangle, a circle, an ellipse, a ring and equivalent deformation.

[0018] Compared with the prior art, the application has the beneficial effects that: the application is applied to the field of mobile phone communication, can be applied to the receiving and transmitting equipment of a millimeter wave frequency band mobile phone communication system, adopts a coaxial transmission structure, can avoid coupling with surrounding structures, and can be integrated with a radio frequency integrated circuit, the antenna design and the metal frame are integrated by the application, a more compact and simple structure can be realized, the space inside the mobile phone is saved, the metal frame, the dielectric material block and the laminated circuit board are conformal in the application, integrated design is realized, two kinds of antenna groups are combined and a complementary source antenna is formed by simultaneous excitation, the working bandwidth is greatly expanded, and the performance of the overall antenna is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, together with the embodiments of the application, to explain the application, and do not constitute a limitation on the application. In the drawings:

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

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

[0022] Figure 3 is a side view of the laminated circuit board of the metal frame antenna of the application;

[0023] Figure 4 is a top view of the laminated circuit board of the metal frame antenna of the application;

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

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

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

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

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0029] The present application provides technical solutions:

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

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

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

[0033] Referring to Figure 5 The working bandwidth of the millimeter wave metal frame mobile phone antenna simulation of the embodiment of the application is 16.41%, the high resonance frequency point is 30.75 GHz, and the low resonance frequency point is 28 GHz. Referring to Figure 6 The highest gain in the working bandwidth of the millimeter wave metal frame mobile phone antenna in the embodiment of the application is 6.7dBi, and the central gain in the working bandwidth is higher than 6.2dBi. Referring to Figure 7 and Figure 8 The normalized radiation pattern of the millimeter wave metal frame mobile phone antenna in the embodiment of the application at 29.5 GHz has a maximum radiation direction in the 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 30 dB higher than the horizontal polarization (cross polarization) field, which indicates that the antenna produces vertical polarization radiation.

[0034] Working principle: the metalized via hole 12 beside the feeding line 10 is connected with the upper and lower layers of the dielectric substrate to form a closed space, avoiding the coupling between the feeding line 10 and the surrounding circuit or device, so that the antenna has a zero clearance characteristic. The metalized blind hole 11 is connected with the feeding line 10, the blind hole produces vertical polarization radiation at a high frequency of 30.75 GHz, the metal frame 1 produces vertical polarization radiation at a low frequency of 28 GHz, the height of the metalized blind hole 11 can be adjusted to change the frequency of the high frequency resonance point, the length of the long side of the rectangular window 2 on the metal frame 1 can be adjusted to change the frequency of the low frequency resonance point, the diameter of the metalized blind hole 11 can be adjusted to simultaneously affect the impedance matching degree of high and low frequencies, and the width of the feeding line 10, the thickness of the lower dielectric substrate 9 and the distance between the metalized via hole 12 and the feeding line 10 can be adjusted to change the equivalent impedance of the feeding structure.

[0035] It is to be noted that, in the present text, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0036] Finally, it should be noted that the above-mentioned only constitutes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent replacements can be made to some of the technical features. Any modifications, equivalent replacements, improvements, and the like made within the spirit and principle of the present application shall fall within the scope of the protection of the present application.

Claims

1. A metal bezel zero-gap mmWave mobile phone antenna, characterized in that: The application relates to a metal frame (1) and a laminated circuit board (4). The metal frame (1) has a rectangular window (2) arranged on the metal frame (1). The dielectric material block (3) is arranged in the rectangular window (2) of the metal frame (1) and fills the rectangular window (2) so that the rectangular window (2) appears seamless in appearance. The laminated circuit board (4) has a part extending into the rectangular window (2) and being arranged at a distance behind the dielectric material block (3), and the laminated circuit board (4) comprises an upper metal surface (5), a lower metal surface (6), an upper dielectric substrate (7), a glue layer (8), a lower dielectric substrate (9), a feed line (10), a metalized blind hole (11) and a metalized through hole (12), wherein the part of the laminated circuit board (4) comprising the metalized blind hole (11) is arranged in the rectangular window (2), the laminated circuit board (4) is arranged from top to bottom with the upper metal surface (5), the upper dielectric substrate (7), the feed line (10), the glue layer (8), the lower dielectric substrate (9), the lower metal surface (6) and a radio frequency integrated circuit, the metalized blind hole (11) penetrates through the upper dielectric substrate (7) and is connected with the upper metal surface (5) and the feed line (10), the metalized through hole (12) surrounding the feed line (10) penetrates through the upper dielectric substrate (7), the glue layer (8) and the lower dielectric substrate (9), the feed line (10) is connected with the radio frequency transceiver chip at the starting end and is connected with the metalized blind hole (11) at the end, and the metalized through hole (12) is arranged beside the feed line (10). The glue layer (8) and the feed line (10) are arranged between the upper dielectric substrate (7) and the lower dielectric substrate (9). The metalized blind hole (11) penetrates through the upper dielectric substrate (7). The metalized through hole (12) penetrates through the upper dielectric substrate (7), the glue layer (8) and the lower dielectric substrate (9) and is connected with the upper metal surface (5), the lower metal surface (6) and the feed line (10) to form a coaxial transmission structure.

2. The metal bezel zero-gap mmWave mobile phone antenna according to claim 1, wherein: The feed line (10), the metalized blind hole (11) and the metal frame (1) are connected in series, and the metalized blind hole (11) and the rectangular window (2) jointly serve as a radiation structure.

3. The metal bezel zero-gap mmWave mobile phone antenna according to claim 2, wherein: The height of the metalized blind hole (11) and the length of the rectangular window (2) determine the high-low matching frequency point to expand the matching bandwidth, and the height of the metalized blind hole (11) and the length of the rectangular window (2) can be adjusted.

4. The metal bezel zero-gap mmWave mobile phone antenna according to claim 3, wherein: The dielectric constant and dielectric loss of the dielectric material block can be changed.

5. The metal bezel zero-gap mmWave mobile phone antenna according to claim 4, wherein: The metalized blind hole (11) can have a rectangular shape, a circular shape, an oval shape, a ring shape or an equivalent deformation.

6. The metal bezel zero-gap mmWave mobile phone antenna according to claim 5, wherein: ​ 7. The metal bezel zero-gap mmWave mobile phone antenna according to claim 6, wherein: ​ 8. The metal frame zero-bezel mmWave mobile phone antenna according to claim 7, wherein: ​

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