A wave-trap structure 4G antenna

Abstract

This invention relates to the field of 4G antenna technology and discloses a notch-screen 4G antenna, comprising an antenna feed point, three antenna radiators, and two notch structures. The three antenna radiators are antenna radiator one, antenna radiator two, and antenna radiator three. The two notch structures are notch structure one and notch structure two. The antenna feed point is connected to antenna radiator one. Antenna radiators one, two, and three are arranged sequentially or in a branched distribution along the signal transmission direction. Notch structure one is located adjacent to antenna radiator three. This invention eliminates the need for additional RF front-end filtering circuitry. By integrating a targeted notch structure into the antenna body, precise attenuation of unrelated interference frequencies around 3-4 GHz and 5 GHz can be achieved. This avoids increased costs due to additional hardware and saves motherboard installation space, adapting to the design trend of miniaturization and thinning of electronic devices.

Description

Technical Field

[0001] This invention relates to the field of 4G antenna technology, and more particularly to a notch-screen 4G antenna. Background Technology

[0002] With the rapid development of mobile communication technology, 4G communication, due to its advantages such as high-speed data transmission and stable signal coverage, has been widely used in various wireless electronic products such as smartphones, IoT devices, and portable terminals. Currently, the wireless communication environment is becoming increasingly complex, and the dense deployment of various electronic devices has intensified competition for spectrum resources. As a core component of wireless communication systems, the performance of antennas directly affects the overall communication quality. At the same time, relevant domestic and international communication certifications (such as the FCC) have placed more stringent requirements on the electromagnetic compatibility and anti-interference capabilities of antennas. How to reduce interference from unrelated frequencies on the entire system while ensuring the antenna's own communication performance has become a pressing technical problem to be solved in the industry.

[0003] In existing technologies, two technical solutions are typically used to meet the aforementioned certification requirements and reduce frequency interference: one is to add a filter circuit to the radio frequency front-end to block unrelated frequency signals; the other is to sacrifice some antenna communication performance by adjusting antenna radiation parameters to avoid interfering frequency bands. However, both solutions have significant drawbacks: for the solution of adding a radio frequency front-end filter circuit, the additional filter components not only increase hardware costs but also occupy valuable installation space on the motherboard, which is detrimental to the miniaturization and thinning design of electronic devices; for the solution of sacrificing antenna performance, it will directly lead to a decrease in core indicators such as 4G signal transmission efficiency and coverage, affecting the user's communication experience.

[0004] Based on this, a notch-screen 4G antenna is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a notch-beam structure 4G antenna to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A notch-screen 4G antenna includes an antenna feed point, three antenna radiators, and two notch structures. The three antenna radiators are antenna radiator one, antenna radiator two, and antenna radiator three, and the two notch structures are notch structure one and notch structure two. The antenna feed point is connected to antenna radiator one. Antenna radiator one, antenna radiator two, and antenna radiator three are arranged sequentially or in a bifurcated manner along the signal transmission direction. Notch structure one is located near antenna radiator three, and notch structure two is located near antenna radiator two.

[0007] Preferably, the first antenna radiator is a 4G low-frequency radiator used to cover 4G low-frequency signals; the second antenna radiator is a 4G mid-frequency radiator used to cover 4G mid-frequency signals; and the third antenna radiator is a 4G high-frequency radiator used to cover 4G high-frequency signals.

[0008] Preferably, the first notch structure is a current mutual cancellation structure, used to attenuate radiation around 5 GHz to a preset range; the second notch structure is a current mutual cancellation structure, used to attenuate radiation in the 3-4 GHz frequency band to a preset range.

[0009] Preferably, the antenna feed point is a signal input port in the form of a microstrip line, made of metal.

[0010] Preferably, antenna radiator one, antenna radiator two, and antenna radiator three are all metal stubular structures, and their lengths decrease sequentially, with antenna radiator one being the longest and antenna radiator three being the shortest.

[0011] Preferably, the antenna feed point, the three antenna radiators, and the two notch structures are all disposed on a PCB substrate.

[0012] Preferably, the PCB dielectric substrate has a ground plane, which is located in the edge region of the PCB dielectric substrate.

[0013] Preferably, the first notch structure is adjacent to the third antenna radiator but not in contact with it, and the second notch structure is adjacent to the second antenna radiator but not in contact with it.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This application does not require additional RF front-end filtering circuits. It can achieve precise attenuation of unrelated interference frequencies of about 3-4GHz and 5GHz by integrating a targeted notch structure into the antenna body. This avoids the cost increase caused by additional hardware and saves motherboard installation space, which is in line with the design trend of miniaturization and thinning of electronic devices.

[0015] 2. This application uses the current mutual cancellation mechanism of the notch structure to effectively suppress interference frequency radiation without changing the core operating parameters of the radiators in the low, medium and high frequency bands of 4G, thus ensuring the original performance of 4G signal transmission. It also significantly improves the standing wave ratio of the antenna after 3GHz, greatly reducing the mutual interference between the antenna and the whole device, and making it easier to meet the relevant certification requirements of FCC and other domestic and foreign certifications. Attached Figure Description

[0016] Figure 1 A schematic diagram of a 2D structure of a 4G antenna according to an embodiment of the present invention is shown.

[0017] Legend: 1. Antenna feed point; 2. Antenna radiator one; 3. Antenna radiator two; 4. Antenna radiator three; 5. Notch filter structure one; 6. Notch filter structure two. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 The present invention provides a technical solution: A notch-structured 4G antenna includes an antenna feed point 1, three antenna radiators and two notch structures. The three antenna radiators are antenna radiator 1 2, antenna radiator 2 3 and antenna radiator 3 4, and the two notch structures are notch structure 1 5 and notch structure 2 6. Antenna feed point 1 is connected to antenna radiator 1 2. Antenna radiator 1 2, antenna radiator 2 3, and antenna radiator 3 4 are arranged sequentially or in a bifurcated manner along the signal transmission direction. Each radiator does not overlap and the spacing is adapted to the signal transmission requirements of the 4G band to avoid mutual interference. Notch structure 1 5 is set near antenna radiator 3 4, and notch structure 2 6 is set near antenna radiator 2 3.

[0020] Specifically, such as Figure 1 As shown, antenna radiator 1 (2) is a 4G low-frequency radiator used to cover 4G low-frequency signals, which are typically 700-960MHz; antenna radiator 2 (3) is a 4G mid-frequency radiator used to cover 4G mid-frequency signals, which are typically 1710-2170MHz; and antenna radiator 3 (4) is a 4G high-frequency radiator used to cover 4G high-frequency signals, which are typically 2300-2700MHz.

[0021] Specifically, such as Figure 1 As shown, notch structure 5 is a current mutual cancellation structure, formed by a combination of metal branches and gaps. It achieves cancellation through the reverse superposition of coupled currents, and is used to attenuate the radiation of about 5 GHz to a preset range. The preset range is the interference suppression threshold that meets the relevant certifications such as FCC, so as to significantly reduce the radiation intensity of this frequency band. Notch structure 6 is a current mutual cancellation structure with the same structure as notch structure 5. It is adapted to the current characteristics of the 3-4 GHz frequency band and is used to attenuate the radiation of the 3-4 GHz frequency band to a preset range. As mentioned above, it achieves effective shielding of interference signals in this frequency band.

[0022] Specifically, such as Figure 1 As shown, antenna feed point 1 is a signal input port in the form of a microstrip line. It adopts a 50Ω coplanar waveguide structure to adapt to the conventional RF signal transmission impedance. It is made of metal material, preferably copper foil, and etched on the surface of the PCB dielectric substrate, with excellent conductivity.

[0023] Specifically, such as Figure 1 As shown, antenna radiators 1-2, 2-3, and 3-4 are all metal branch structures, formed by copper foil etching and integrated with the PCB substrate. Their lengths decrease sequentially, with antenna radiator 1-2 being the longest and suitable for longer wavelengths in the low-frequency band. It requires a bending design to reduce the space occupied. Antenna radiator 3-4 is the shortest and matches the short wavelength characteristics in the high-frequency band.

[0024] Specifically, the antenna feed point 1, the three antenna radiators, and the two notch structures are all set on the PCB dielectric substrate. The PCB dielectric substrate is preferably made of FR-4 material, with a relative permittivity of about 4.4 and a thickness of 0.8-1.6mm, which is easy to process and has a low cost.

[0025] Specifically, such as Figure 1 As shown, a ground plane is provided on the PCB dielectric substrate. The ground plane is a rectangular metal copper foil area located at the edge of the PCB dielectric substrate, with an area of ​​1 / 3 to 1 / 2 of the PCB dielectric substrate. It is used to stabilize the antenna impedance and reduce signal reflection.

[0026] Specifically, such as Figure 1 As shown, notch structure 5 is adjacent to antenna radiator 4 but not in contact with it, with a spacing of 0.5-2mm to ensure coupling effect and achieve current cancellation. Notch structure 6 is adjacent to antenna radiator 3 but not in contact with it, with a spacing consistent with notch structure 5, to ensure attenuation effect in the 3-4GHz frequency band.

[0027] The above description of the embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A notch-screen 4G antenna, comprising an antenna feed point (1), three antenna radiators, and two notch structures, characterized in that, The three antenna radiators are antenna radiator one (2), antenna radiator two (3) and antenna radiator three (4), and the two notch structures are notch structure one (5) and notch structure two (6). The antenna feed point (1) is connected to the first antenna radiator (2). The first antenna radiator (2), the second antenna radiator (3), and the third antenna radiator (4) are arranged sequentially or in a bifurcated manner along the signal transmission direction. The first notch structure (5) is set near the third antenna radiator (4), and the second notch structure (6) is set near the second antenna radiator (3).

2. The notch-screen 4G antenna according to claim 1, characterized in that, The first antenna radiator (2) is a 4G low-frequency radiator used to cover 4G low-frequency signals; the second antenna radiator (3) is a 4G mid-frequency radiator used to cover 4G mid-frequency signals; and the third antenna radiator (4) is a 4G high-frequency radiator used to cover 4G high-frequency signals.

3. A notch filter structure 4G antenna according to claim 1, characterized in that, The first notch structure (5) is a current mutual cancellation structure used to attenuate radiation around 5 GHz to a preset range; the second notch structure (6) is a current mutual cancellation structure used to attenuate radiation in the 3-4 GHz band to a preset range.

4. A notch filter structure 4G antenna according to claim 1, characterized in that, The antenna feed point (1) is a signal input port in the form of a microstrip line and is made of metal.

5. A notch filter structure 4G antenna according to claim 1, characterized in that, The antenna radiator 1 (2), antenna radiator 2 (3), and antenna radiator 3 (4) are all metal stub structures, and their lengths decrease sequentially. The antenna radiator 1 (2) is the longest, and the antenna radiator 3 (4) is the shortest.

6. A notch filter structure 4G antenna according to claim 1, characterized in that, The antenna feed point (1), the three antenna radiators, and the two notch structures are all disposed on the PCB substrate.

7. A notch filter structure 4G antenna according to claim 6, characterized in that, The PCB dielectric substrate has a ground plane, which is located in the edge region of the PCB dielectric substrate.

8. A notch filter structure 4G antenna according to claim 1, characterized in that, The first notch structure (5) is adjacent to the third antenna radiator (4) but not in contact with it, and the second notch structure (6) is adjacent to the second antenna radiator (3) but not in contact with it.

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