A small clearance multi-band laptop metal frame antenna

Abstract

This invention belongs to the field of antenna technology, specifically a small-clearance, multi-band laptop metal frame antenna. The antenna of this invention includes a metal backplate, a metal frame, a dielectric substrate, an inverted-T stepped slot antenna, and an inverted-T slot antenna. The metal backplate and metal frame are etched on the outer layer of the dielectric substrate to form the laptop's metal casing. Two slot antenna elements are vertically positioned and located on the upper right and right sides of the metal casing, respectively. They are integrated into the metal casing and etched on the outer layer of the dielectric substrate. The inverted-T stepped slot antenna includes a stepped main wall, parasitic arms, and ring arms. An inverted hook-shaped microstrip feed structure is etched on the inner layer of the dielectric substrate and connected to the inverted-T stepped slot antenna through metal vias. The inverted-T slot antenna includes a main arm and parasitic arms. An inverted-U shaped microstrip feed structure is etched on the inner layer of the dielectric substrate and connected to the inverted-T slot antenna through metal vias. This antenna can operate in multiple frequency bands, including Wi-Fi 6E and 5G NR, occupies little clearance, and is suitable for narrow-bezel laptops.

Description

Technical Field

[0001] This invention belongs to the field of antenna technology, specifically relating to a small clearance multi-band laptop metal frame antenna. Background Technology

[0002] The development of modern mobile communication systems is inseparable from the research of antenna technology. Low-latency, high-reliability 5G NR technology is widely used in mobile terminal devices. Furthermore, with the introduction of the next-generation 6G mobile communication system, greater throughput and lower latency are provided for laptop communication systems. The Wi-Fi 6E technology protocol has approved the usable frequency band of 6GHz (5.95-7.125GHz). This places 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 an increasing number of frequency bands. However, full-screen laptops with high-frequency ratios and metal bezels are gradually becoming a trend in the consumer market. A higher screen-to-body ratio leaves less space for antenna design. Therefore, the problem of achieving broadband and multi-band characteristics while reducing antenna clearance remains to be solved. A review of existing technical literature reveals no current research on laptop metal-frame antennas with small clearance that support Wi-Fi 6E / 5G NR bands. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and defects in the existing technology and provide a multi-band laptop metal frame antenna that can simultaneously cover the Wi-Fi 6E and 5G NR bands, and is simple in structure, lightweight, easy to process, and occupies little clearance.

[0005] The small clearance multi-band laptop metal frame antenna provided by this invention is a dual-antenna unit structure. The two antenna units are slot antenna structures integrated into the metal frame, as shown in the figure. Figure 1 , Figure 2 , Figure 3 As shown, it specifically includes a metal backplate 1, a metal frame 2, a dielectric substrate 3, an asymmetric inverted-T stepped slot antenna 4, and an asymmetric inverted-T slot antenna 5; the metal backplate 1 and the metal frame 2 are etched on the outer layer of the dielectric substrate 3 to form the notebook's metal casing; the two slot antenna units are arranged vertically and adjacently, located at the upper right and right side of the metal casing respectively, integrated into the metal casing and etched on the outer layer of the dielectric substrate; wherein:

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

[0007] The stepped main arm 41 is composed of an inverted L-shaped slot and a rectangular slot forming a stepped slot structure. The parasitic arm 42 is an inverted L-shaped structure. The stepped main arm 41 and the parasitic arm 42 are connected to the metal frame 2 and the metal back plate 1 through a first gap 44. The annular arm 43 is connected to the stepped main arm 41. The inverted L-shaped matching metal strip 61 is parallel to the asymmetric inverted T-shaped stepped slot antenna 4 and is connected through a first metal through hole 63, which is located above the stepped main arm.

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

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

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

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

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

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

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

[0015] Literature review results indicate that there are currently no laptop metal frame antennas that support multiple frequency bands for Wi-Fi 6E and 5G NR. This invention rationally designs the antenna structure and location, employing a multi-antenna, slot structure design to integrate the antenna into the metal frame, achieving coverage of multiple frequency bands for Wi-Fi 6E and 5G NR within an extremely small clearance of 1.2mm. Simulation results show that the asymmetric inverted-T stepped slot antenna performs well in the 2.29-2.56GHz and 4.93-7.42GHz frequency ranges. 11 |<-6dB, asymmetric inverted T-slot antenna in the 3.1-5.0GHz frequency range|S 22 |<-6dB. The two-slot antenna element achieves an isolation of over 19dB across the entire operating frequency range, demonstrating excellent isolation. The antenna efficiency is greater than 40% within the operating frequency band. The two-slot antenna element exhibits good omnidirectional radiation pattern. The dimensions of the asymmetric inverted T-shaped stepped slot antenna are 25.6 × 1.2 × 3 mm. 3 The dimensions of the asymmetric inverted T-slot antenna are 23.3 × 1.2 × 3 mm. 3 It features small headroom, simple structure, and easy processing. Attached Figure Description

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

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

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

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

[0020] Figure 5 This invention relates to a small clearance multi-band laptop metal frame antenna |S 21 Simulation results.

[0021] Figure 6 The simulation results show the efficiency of the small clearance multi-band laptop metal frame antenna of this invention.

[0022] Figure 7 The simulation results show the radiation pattern of the small clearance multi-band laptop metal frame antenna of this invention.

[0023] In the diagram, the following labels are used: 1 is the metal backplate, 2 is the metal frame, 3 is the dielectric substrate, 4 is the asymmetric inverted T-shaped stepped slot antenna, 41 is the stepped main arm of the asymmetric inverted T-shaped stepped slot antenna, 42 is the parasitic arm, 43 is the ring arm, and 44 is the first slot; 5 is the asymmetric inverted T-shaped slot antenna, 51 is the main arm of the asymmetric inverted T-shaped slot antenna, 52 is the parasitic arm, and 53 is the second slot; 6 is the hook-shaped microstrip feed structure, 61 is the inverted L-shaped metal matching strip in the hook-shaped microstrip feed structure, 62 is the 50-ohm transmission line, and 63 is the first metal via; 7 is the inverted U-shaped microstrip feed structure, 71 is the horizontal matching metal strip in the inverted U-shaped microstrip feed structure, 72 is the L-shaped 50-ohm transmission line, and 73 is the second metal via. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments: This embodiment is implemented under the premise of the technical solution of the present invention, and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0025] like Figure 1-3 As shown, this invention provides an antenna suitable for the metal frame of a 14-inch small-clearance multi-band laptop, covering the frequency range of 2.4-2.48GHz / 3.3-5GHz / 5.15-7.125GHz. The asymmetric inverted T-shaped stepped slot antenna has dimensions of 25.6×1.2×3mm. 3 The dimensions of the asymmetric inverted T-slot antenna are 23.3 × 1.2 × 3 mm. 3 This embodiment includes: a metal backplate 1, a metal frame 2, a dielectric substrate 3, an asymmetric inverted T-shaped stepped slot antenna 4, and an asymmetric inverted T-shaped slot antenna 5.

[0026] like Figure 1 As shown, in this embodiment, the metal backplate 1 and the metal frame 2 are etched on the outer layer of the dielectric substrate 3 to form the notebook metal casing. The asymmetric inverted T-shaped slot antenna 4 and the asymmetric inverted T-shaped slot antenna 5 are arranged vertically and adjacently, located at the upper right and right side of the metal casing respectively, and integrated into the metal casing 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 stepped slot antenna 4 includes a stepped main arm 41, a parasitic arm 42, and a ring arm 43. The hook-shaped microstrip feed structure 6 includes an inverted-L-shaped matching strip 61 and a 50-ohm transmission line 62, which are etched into the inner layer of the dielectric substrate 3 and connected to the asymmetric inverted-T stepped slot antenna 4 through a first metal via 63. The stepped main arm 41 is composed of an inverted-L-shaped slot and a rectangular slot forming a stepped slot structure. The parasitic arm 42 is an inverted-L-shaped structure. The stepped main arm 41 and the parasitic arm 42 are connected to the metal frame 2 and the metal back plate 1 through a first gap 44. The ring arm 43 is connected to the stepped main arm 41. The inverted L-shaped matching metal strip 61 is parallel to the asymmetric inverted T-shaped stepped slot antenna 4 and connected through a first metal through-hole 63, which is located above the stepped main arm 41. The lengths of the stepped main arm 41, parasitic arm 42, and annular arm 43 determine the resonant frequency of the antenna, while the inverted L-shaped matching strip 61 and the first metal through-hole 63 affect the impedance matching. The initial dimensions were obtained based on empirical formulas and then optimized using the simulation software CST Studio Suite 2023, ultimately resulting in a main arm 41 length of 19 mm and a rectangular slot size of 6 × 0.8 mm. 2 The parasitic arm 42 has a length of 5.1 mm, the annular arm 43 has a length of 9.7 mm, the inverted L-shaped matching metal strip 61 has a length of 10.9 mm, and the first metal through hole 63 has a diameter of 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. The inverted U-shaped microstrip feed structure 7 includes a horizontal matching metal strip 71 and an L-shaped 50-ohm transmission line 72, which are etched into the inner layer of the dielectric substrate 3 and connected to the asymmetric inverted T-slot antenna 5 through a second metal via 73. Both the main arm 51 and the parasitic arm 52 are inverted L-shaped slot structures, and are connected to the metal backplate 1 at the metal frame 2 through a second gap 53. The horizontal matching strip 71 is parallel to the asymmetric inverted T-slot antenna 5 and is connected through the second metal via 73, which is located above the main arm 51. The lengths of the main arm 51 and the parasitic arm 52 determine the resonant frequency of the antenna, while the horizontal matching metal strip 71 and the second metal via 73 affect the impedance matching. The initial dimensions were obtained based on empirical formulas and then optimized using simulation software CST Studio Suite 2023. The final dimensions were: main arm 51 with a length of 13.2 mm, parasitic arm 52 with a length of 8.4 mm, horizontal matching metal strip 71 with a length of 7.5 mm, and second metal through hole 73 with a diameter of 0.3 mm.

[0029] like Figure 1As shown, in this embodiment, the metal backplate 1 is 310mm long and 210mm wide, and the metal frame 2 is 3mm wide, suitable for a 14-inch laptop. The dielectric substrate 3 is 310×210×3mm in size. 3 The 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 in GHz, and the vertical axis represents the S-parameter variable in dB. As can be seen from the figure, the small clearance multi-band laptop metal frame antenna of this invention exhibits |S... 11 |<-6dB; In the 3.3-5.0GHz frequency range, |S 22 |<-6dB. The antenna covers the entire Wi-Fi 6E / 5G NR band.

[0031] like Figure 5 As shown, in this embodiment, the frequency characteristics include |S 21 | where the horizontal axis represents the frequency variable in GHz, and the left vertical axis represents |S. 21 |Variable, unit is dB. The antenna isolation of the small clearance multi-band laptop metal frame of this invention is within the Wi-Fi 6E and 5G NR frequency ranges |S 21 |<-19dB, with 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 in GHz, and the left vertical axis represents the efficiency variable, which is dimensionless. The efficiency of the small-headroom multi-band laptop metal frame antenna of this invention is greater than 40% in the Wi-Fi 6E and 5G NR frequency ranges.

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

[0034] The technical solutions of the present invention are not limited to the specific examples mentioned above. For example, the small clearance multi-band metal frame antenna of the present invention can be adapted to other microwave bands by changing its size. All technical modifications made according to the technical solutions 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, Simultaneously covering Wi-Fi 6E and 5G NR bands; specifically including a metal backplate (1), a metal frame (2), a dielectric substrate (3), an asymmetric inverted T-shaped slot antenna (4), and an asymmetric inverted T-slot antenna (5); the metal backplate (1) and the metal frame (2) are etched on the outer layer of the dielectric substrate (3) to form the notebook metal casing; the two slot antenna units are arranged vertically and adjacently, located on the upper right and right side of the metal casing respectively, integrated into the metal casing and etched on the outer layer of the dielectric substrate; wherein: The asymmetric inverted T-shaped stepped slot antenna (4) includes a stepped main arm (41), a parasitic arm (42), and a ring arm (43); the hook-shaped microstrip feed structure (6) includes an inverted L-shaped matching metal strip (61) and a 50-ohm transmission line (62), which are etched in the inner layer of the dielectric substrate (3) and connected to the asymmetric inverted T-shaped stepped slot antenna (4) through a first metal via (63); The stepped main arm (41) is composed of an inverted L-shaped slot and a rectangular slot to form a stepped slot structure. The parasitic arm (42) is an inverted L-shaped structure. The stepped main arm (41) and the parasitic arm (42) are connected to the metal back plate (1) at the metal frame (2) through the first gap (44). The ring arm (43) is connected to the stepped main arm (41). The inverted L-shaped matching metal strip (51) is parallel to the asymmetric inverted T-shaped stepped slot antenna (4) and is connected through the first metal through hole (63). The first metal through hole (63) is located above the stepped main arm. The asymmetric inverted T-slot antenna (5) includes a main arm (51) and a parasitic arm (52); the inverted U-shaped microstrip feed structure (7) includes a horizontal matching metal strip (71) and an L-shaped 50-ohm transmission line (72), which are etched in the inner layer of the dielectric substrate (3) and connected to the asymmetric inverted T-slot antenna (5) through a second metal via (73); The main arm (51) and the parasitic arm (52) are both inverted L-shaped slot structures. 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 gap (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). The second metal through hole is located above the main arm. The first metal through hole (63) and the second metal through hole (73) 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-shaped stepped slot antenna (4), the stepped main arm (41), parasitic arm (42) and 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, In the asymmetric inverted T-slot antenna (5), the main arm (51) and the parasitic arm (52) 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; the dielectric substrate is FR-4.

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