Small-clearance multiband notebook computer metal frame antenna

Abstract

The invention belongs to the technical field of antennas, and particularly relates to a small-clearance multiband notebook computer metal frame antenna. The antenna provided by the invention comprises a metal backboard, a metal frame, a dielectric substrate, an inverted T-shaped stepped slot antenna and an inverted T-shaped slot antenna, the metal back plate and the metal frame are etched on the outer layer of the dielectric substrate to form a notebook computer metal shell; the two slot antenna units are vertical and are respectively positioned on the upper right side and the right side of the metal shell; the dielectric substrate is integrated on the metal shell and etched on the outer layer of the dielectric substrate; the inverted-T step-shaped slot antenna comprises a step-shaped main wall, a parasitic arm and an annular arm, and the barb-shaped microstrip feed structure is etched on the inner layer of the dielectric substrate and is connected with the inverted-T step-shaped slot antenna through a metal through hole; the inverted-T-slot antenna comprises a main arm and a parasitic arm, and the inverted-U-shaped microstrip feed structure is etched on the inner layer of the dielectric substrate and is connected with the inverted-T-slot antenna through a metal through hole. The antenna provided by the invention can work at multiple frequency bands of WI-FI 6E and 5G NR, occupies small clearance, and is suitable for a narrow-frame notebook computer.

Description

Technical Field

[0001] The invention belongs to the technical field of antennas, and in particular relates to a small-clearance multi-band notebook metal frame antenna. Background Art

[0002] The development of modern mobile communication systems is inseparable from the research of antenna technology. The low-latency and high-reliability 5G NR technology is widely used in mobile terminal devices. In addition, with the introduction of the new generation of 6G mobile communication systems, it provides laptop communication systems with greater throughput and lower latency. The Wi-Fi 6E technology protocol approves the usable frequency band of 6GHz (5.95-7.125GHz). This puts higher demands on the design of laptop antennas.

[0003] In recent decades, researchers have designed various types of laptop antennas. With the development of mobile communication systems, laptops need to support more and more frequency bands. However, full-screen laptops with high-frequency ratio and metal frames have gradually become a trend in the consumer market. The higher the screen-to-body ratio, the less space can be left for antenna design. Therefore, the problem of how to achieve broadband and multi-band characteristics while reducing antenna clearance needs to be further solved. Through the search of existing technical literature, there is currently no relevant research on laptop metal frame antennas with small clearance and supporting Wi-Fi6E / 5G NR bands. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and defects in the prior art and provide a multi-band notebook metal frame antenna that can simultaneously cover Wi-Fi 6E and 5G NR frequency bands, and has a simple structure, is lightweight, easy to process, and occupies a small clearance.

[0005] The small clearance multi-band notebook metal frame antenna provided by the present invention is a dual antenna unit structure, and the two antenna units are slot antenna structures integrated at the metal frame. The structure is as follows Figure 1 , Figure 2 , Figure 3 As shown, it specifically includes a metal back plate 1, a metal frame 2, a dielectric substrate 3, an asymmetric inverted T ladder slot antenna 4, and an asymmetric inverted T slot antenna 5; the metal back plate 1 and the metal frame 2 are etched on the outer layer of the dielectric substrate 3 to form a metal shell of the notebook; the two slot antenna units are arranged vertically and adjacently, respectively located on the upper right and right side of the metal shell, integrated in the metal shell and etched on the outer layer of the dielectric substrate; wherein:

[0006] The asymmetric inverted T-step slot antenna 4 comprises a step-type main arm 41, a parasitic arm 42, and a ring arm 43; the hook-type microstrip feeding structure 6 comprises an inverted L-shaped matching metal strip 61 and a 50-ohm transmission line 62, which are etched on the inner layer of the dielectric substrate 3 and connected to the asymmetric inverted T-step slot antenna 4 through a first metal through hole 63;

[0007] The step-type main arm 41 is composed of a step-type slot structure formed by an inverted L-shaped slot and a rectangular slot, the parasitic arm 42 is an inverted L-shaped structure, the step-type main arm 41 and the parasitic arm 42 are connected at the metal frame 2 and the metal back plate 1 through the first slit 44, and the ring arm 43 is connected to the step-type main arm 41. The inverted L-shaped matching metal strip 61 is parallel to the asymmetric inverted T step-type slot antenna 4 and is connected through the first metal through hole 63, and the first metal through hole 63 is located above the step-type main arm;

[0008] The asymmetric inverted T-slot antenna 5 comprises a main arm 51 and a parasitic arm 52, and the inverted U-shaped microstrip feeding structure 7 comprises a horizontal matching metal strip 71 and an L-shaped 50-ohm transmission line 72, which are etched on the inner layer of the dielectric substrate 3 and connected to the asymmetric inverted T-slot antenna 5 through a second metal through hole 73;

[0009] The main arm 51 and the parasitic arm 52 are both inverted L-shaped slot structures, and the main arm 51 and the parasitic arm 52 are connected at the metal frame 2 and the metal back plate 1 through the second slit 53. The horizontal matching metal strip 71 is parallel to the asymmetric inverted T-slot antenna 5 and is connected through the second metal through hole 73, and the second metal through hole 73 is located above the main arm 51.

[0010] The two metal through holes have different diameters.

[0011] In the present invention, the stepped main arm 41, the parasitic arm 42 and the ring arm 43 of the asymmetric inverted T-step slot antenna are one quarter of the wavelength.

[0012] In the present invention, the main arm 51 and the parasitic arm 52 of the asymmetric inverted T-slot antenna are one quarter of the wavelength.

[0013] In the present invention, the metal frame, metal ground and metal strip are copper foils with a thickness of 0.02-0.05 mm; in the embodiment, the thickness is 0.02 mm.

[0014] In the present invention, the dielectric substrate is FR-4.

[0015] The results of literature search show that there is no laptop metal frame antenna that can support Wi-Fi 6E and 5G NR multi-bands. The present invention rationally designs the structure and position of the antenna, adopts a multi-antenna and slot structure design, and integrates the antenna into the metal frame, achieving coverage of Wi-Fi 6E and 5G NR multiple frequency bands with a very small clearance of 1.2mm. Simulation results show that the asymmetric inverted T ladder slot antenna has a good performance in the frequency range of 2.29-2.56GHz and 4.93-7.42GHz. 11 |<-6dB, asymmetric inverted T-slot antenna in the 3.1-5.0GHz frequency range |S 22 |<-6dB. In the entire operating frequency range, the isolation of the two-slot antenna unit is more than 19dB, with good isolation. The efficiency of the antenna is greater than 40% in the operating frequency band. The radiation pattern of the two-slot antenna unit has good omnidirectionality. The size of the asymmetric inverted T ladder slot antenna is 25.6×1.2×3mm 3 The size of the asymmetric inverted T-slot antenna is 23.3×1.2×3mm 3 , with the characteristics of small clearance, simple structure and easy processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the small clearance multi-band notebook metal frame antenna of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the asymmetric inverted T-step slot antenna unit of the small clearance multi-band notebook metal frame antenna of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the asymmetric inverted T-slot antenna unit of the small clearance multi-band notebook metal frame antenna of the present invention.

[0019] Figure 4 The S-parameter simulation results of the small clearance multi-band notebook metal frame antenna of the present invention are shown.

[0020] Figure 5 The invention provides a small clearance multi-band notebook metal frame antenna|S 21 |Simulation results.

[0021] Figure 6 This is the efficiency simulation result of the small clearance multi-band notebook metal frame antenna of the present invention.

[0022] Figure 7 This is the simulation result of the radiation pattern of the small clearance multi-band notebook metal frame antenna of the present invention.

[0023] Numbers in the figure: 1 is a metal back plate, 2 is a metal frame, 3 is a dielectric substrate, 4 is an asymmetric inverted T-step slot antenna, 41 is a step-type main arm in the asymmetric inverted T-step slot antenna, 42 is a parasitic arm, 43 is a ring arm, and 44 is a first break; 5 is an asymmetric inverted T-slot antenna, 51 is the main arm of the asymmetric inverted T-slot antenna, 52 is a parasitic arm, and 53 is a second break; 6 is a hook-type microstrip feeding structure, 61 is an inverted L-shaped metal matching strip in the hook-type microstrip feeding structure, 62 is a 50-ohm transmission line, and 63 is a first metal through hole; 7 is an inverted U-shaped microstrip feeding structure, 71 is a horizontal matching metal strip in the inverted U-shaped microstrip feeding structure, 72 is an L-shaped 50-ohm transmission line, and 73 is a second metal through hole. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0025] like Figure 1-3 As shown, the present invention provides a metal frame antenna suitable for a 14-inch small clearance multi-band notebook, covering the frequency range of 2.4-2.48GHz / 3.3-5GHz / 5.15-7.125GHz, and the size of the asymmetric inverted T ladder slot antenna is 25.6×1.2×3mm 3 The size of the asymmetric inverted T-slot antenna is 23.3×1.2×3mm 3 This embodiment includes: a metal back plate 1, a metal frame 2, a dielectric substrate 3, an asymmetric inverted T-step slot antenna 4, and an asymmetric inverted T-slot antenna 5.

[0026] like Figure 1 As shown, in this embodiment, the metal back plate 1 and the metal frame 2 are etched on the outer layer of the dielectric substrate 3 to form a metal shell of the notebook. The asymmetric inverted T ladder slot antenna 4 and the asymmetric inverted T slot antenna 5 are arranged vertically and adjacently, respectively located on the upper right and right side of the metal shell and integrated in the metal shell etched on the outer layer of the dielectric substrate.

[0027] like Figure 2As shown in (a) and (b), in this embodiment, the asymmetric inverted T ladder slot antenna 4 includes a ladder main wall 41, a parasitic arm 42, and a ring arm 43. The hook-type microstrip feeding structure 6 includes an inverted L-shaped matching strip 61 and a 50-ohm transmission line 62, which are etched on the inner layer of the dielectric substrate 3 and connected to the asymmetric inverted T ladder slot antenna 4 through a first metal through hole 63. The ladder main arm 41 is composed of an inverted L-shaped slot and a rectangular slot to form a ladder slot structure, the parasitic arm 42 is an inverted L-shaped structure, the ladder main arm 41 and the parasitic arm 42 are connected to the metal frame 2 and the metal back plate 1 through a first slit 44, and the ring arm 43 is connected to the ladder main arm 41. The inverted L-shaped matching metal strip 61 is parallel to the asymmetric inverted T-step slot antenna 4 and connected through the first metal through hole 63. The first metal through hole 63 is located above the step-type main arm 41. The length of the step-type main arm 41, the parasitic arm 42 and the ring arm 43 determines the resonant frequency of the antenna. The inverted L-shaped matching strip 61 and the first metal through hole 63 affect the impedance matching. The initial size is obtained according to the empirical formula, and then optimized by the simulation software CST Studio Suite 2023. The final length of the main arm 41 is 19mm, and the size of the rectangular slot is 6×0.8mm 2 The length of the parasitic arm 42 is 5.1 mm, the length of the ring arm 43 is 9.7 mm, the length of the inverted L-shaped matching metal strip 61 is 10.9 mm, and the diameter of the first metal through hole 63 is 0.2 mm.

[0028] like Figure 3 As shown, in this embodiment, the asymmetric inverted T-slot antenna 5 includes a main arm 51 and a parasitic arm 52, and the inverted U-shaped microstrip feeding structure 7 includes a horizontal matching metal strip 71 and an L-shaped 50-ohm transmission line 72, which are etched on the inner layer of the dielectric substrate 3 and connected to the asymmetric inverted T-slot antenna 5 through a second metal through hole 73; the main arm 51 and the parasitic arm 52 are both inverted L-shaped slot structures, and the main arm 51 and the parasitic arm 52 are connected to the metal back plate 1 at the metal frame 2 through the second slit 53. The horizontal matching strip 71 is parallel to the asymmetric inverted T-slot antenna 5 and is connected through the second metal through hole 73, and the second metal through hole 73 is located above the main arm 51; the length of the main arm 51 and the parasitic arm 52 determines the resonant frequency of the antenna, and the horizontal matching metal strip 71 and the second metal through hole 73 affect the impedance matching. The initial dimensions are obtained according to an empirical formula and then optimized using the simulation software CST Studio Suite2023. The final length of the main arm 51 is 13.2 mm, the length of the parasitic arm 52 is 8.4 mm, the length of the horizontal matching metal strip 71 is 7.5 mm, and the diameter of the second metal through hole 73 is 0.3 mm.

[0029] like Figure 1As shown, in this embodiment, the length of the metal back plate 1 is 310 mm, the width is 210 mm, and the width of the metal frame 2 is 3 mm, which is suitable for a 14-inch notebook. The size of the dielectric substrate 3 is 310×210×3 mm 3 , thickness is 0.8mm.

[0030] like Figure 4 As shown, in this embodiment, the frequency characteristics include S parameters. The horizontal axis represents the frequency variable, the unit is GHz, and the vertical axis represents the S parameter variable, the unit is dB. It can be seen from the figure that the small clearance multi-band notebook metal frame antenna of the present invention is within the frequency range of 2.4-2.5GHz and 5.15-7.125GHz, |S 11 |<-6dB; in the frequency range of 3.3-5.0GHz, |S 22 |<-6dB. The antenna covers the entire Wi-Fi 6E / 5G NR frequency band.

[0031] like Figure 5 As shown, in this embodiment, the frequency characteristics include |S 21 |. The horizontal axis represents the frequency variable in GHz, and the left vertical axis represents |S 21 |Variable, in dB. The isolation of the metal frame antenna of the small clearance multi-band notebook computer of the present invention is within the frequency range of Wi-Fi 6E and 5G NR|S 21 |<-19dB, there is good isolation between antennas.

[0032] like Figure 6 As shown, in this embodiment, the frequency characteristics include efficiency. The horizontal axis represents the frequency variable, the unit is GHz, and the left vertical axis represents the efficiency variable, which is a unitless dimension. The efficiency of the small clearance multi-band notebook metal frame antenna of the present invention is greater than 40% in the Wi-Fi 6E and 5G NR frequency ranges.

[0033] like Figure 7 As shown, in this embodiment, the total gain radiation patterns of the small clearance multi-band notebook metal frame antenna at 2.4 GHz, 4 GHz and 6 GHz at the horizontal section of θ = 90° are respectively as follows: Figure 7 As shown in (a), (b) and (c), it can be seen that the laptop antenna has good omnidirectionality within the operating frequency.

[0034] The technical solution of the present invention is not limited to the above-mentioned specific examples. For example, the small clearance multi-band metal frame antenna of the present invention can be applied to other microwave bands by changing the size. All technical deformations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A small clearance multi-band notebook metal frame antenna, characterized in that: The device covers both Wi-Fi 6E and 5G NR frequency bands; specifically comprises a metal backplane (1), a metal frame (2), a dielectric substrate (3), an asymmetric inverted T-step slot antenna (4), and an asymmetric inverted T-slot antenna (5); the metal backplane (1) and the metal frame (2) are etched on the outer layer of the dielectric substrate (3) to form a metal shell of the notebook; the two slot antenna units are arranged vertically and adjacently, respectively located on the upper right and right side of the metal shell, integrated in the metal shell and etched on the outer layer of the dielectric substrate; wherein: The asymmetric inverted T-step slot antenna (4) comprises a step-type main arm (41), a parasitic arm (42), and a ring-type arm (43); the hook-type microstrip feeding structure (6) comprises an inverted L-shaped matching metal strip (61) and a 50-ohm transmission line (62), which are etched on the inner layer of the dielectric substrate (3) and connected to the asymmetric inverted T-step slot antenna (4) via a first metal through hole (63); The step-type main arm (41) is composed of an inverted L-shaped groove and a rectangular groove to form a step-type groove structure, the parasitic arm (42) is an inverted L-shaped structure, the step-type main arm (41) and the parasitic arm (42) are connected to the metal back plate (1) at the metal frame (2) through a first fracture (44), and the ring arm (43) is connected to the step-type main arm (41); the inverted L-shaped matching metal strip (51) is parallel to the asymmetric inverted T step-type groove antenna (4), and is connected through a first metal through hole (63), and the first metal through hole (63) is located above the step-type main arm; The asymmetric inverted T-slot antenna (5) comprises a main arm (51) and a parasitic arm (52); the inverted U-shaped microstrip feeding structure (7) comprises a horizontal matching metal strip (71) and an L-shaped 50-ohm transmission line (72), which are etched on the inner layer of the dielectric substrate (3) and connected to the asymmetric inverted T-slot antenna (5) via a second metal through hole (73); The main arm (51) and the parasitic arm (52) are both inverted L-shaped slot structures, and the main arm (51) and the parasitic arm (52) are connected to the metal back plate (1) at the metal frame (2) through a second slit (53); the horizontal matching metal strip (71) is parallel to the asymmetric inverted T-slot antenna (5) and is connected through a second metal through hole (73), and the second metal through hole is located above the main arm; The two metal through holes have different diameters.

2. The small clearance multi-band notebook metal frame antenna according to claim 1, characterized in that: In the asymmetric inverted T-step slot antenna (4), the step-type main arm (41), the parasitic arm (42) and the ring arm (43) are one quarter of the wavelength.

3. The small clearance multi-band notebook metal frame antenna according to claim 1, characterized in that: The main arm (51) and the parasitic arm (52) in the asymmetric inverted T-slot antenna (5) are one quarter of the wavelength.

4. The small clearance multi-band notebook metal frame antenna according to claim 1, characterized in that: The metal frame (2), metal ground and metal strip are made of copper foil with a thickness of 0.02-0.05 mm; and the dielectric substrate is made of FR-4.

Images