Dual-frequency broadband antenna structure

Abstract

The invention relates to a double-frequency broadband antenna structure, which comprises a substrate, a first radiation part, a second radiation part and a feed part, and is characterized in that the substrate is of a square symmetrical structure, the first radiation part is printed on a copper coating layer on the first surface of the substrate, and the second radiation part is printed on a copper coating layer on the second surface of the substrate; the feeding part comprises a radio frequency coaxial cable core wire bonding pad and a radio frequency coaxial cable ground wire bonding pad, the radio frequency coaxial cable core wire bonding pad is arranged at the center of the first surface of the substrate, the radio frequency coaxial cable ground wire bonding pad is arranged at the center of the second surface of the substrate, the first radiation part comprises four first radiators which are rotationally symmetrical, and the second radiation part comprises four second radiators which are rotationally symmetrical. The second radiation part comprises four second radiators which are in rotational symmetry. By adopting the dual-frequency broadband antenna structure, the structural complexity and the cost are reduced. The radiation out-of-roundness of the antenna in the horizontal direction is improved, the uniformity of signal coverage is improved, the radiation efficiency of the antenna is improved, the dependence on a high-frequency PCB is reduced, the cost is reduced, and the overall performance of the WiFi 7 antenna is improved.

Description

Technical Field

[0001] The present invention relates to the field of communications, in particular to the field of antennas, and specifically refers to a dual-bandwidth antenna structure. Background Art

[0002] In the field of wireless communications, especially with the continuous evolution of WiFi technology, users have an increasing demand for high-speed, high-efficiency wireless network connections. As the latest wireless communication standard, WiFi 7, introduced in the 6GHz frequency band, provides users with a wider frequency band and higher data transmission rate. However, the existing WiFi 7 antenna technology has some limitations that affect the performance of the wireless network and the user experience.

[0003] First, most of the existing WiFi 7 antennas on the market are single-band antennas, which only support one frequency band of 5.15-5.85GHz or 5.95-7.25GHz. This design limits the flexibility of antenna use, because users need to deploy multiple antennas to cover different frequency bands, which not only increases costs, but also makes the installation and maintenance of equipment more complicated.

[0004] Secondly, the existing antenna designs are mostly unidirectional dipole forms, which have poor radiation non-circularity in the horizontal direction, resulting in uneven signal coverage, affecting the stability and coverage of the wireless network.

[0005] Finally, the 6G frequency band corresponding to WiFi 7 is relatively high, which leads to greater power loss on the antenna PCB board, and the antenna radiation efficiency is difficult to reach 50%. In order to improve the radiation efficiency, it is usually necessary to use a more expensive high-frequency PCB board, which undoubtedly increases the cost of the product. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a dual-bandwidth antenna structure that has simple structure, low antenna loss and a wide range of applications.

[0007] In order to achieve the above objectives, the dual-bandwidth antenna structure of the present invention is as follows:

[0008] The dual-bandwidth antenna structure has the following main features: the structure includes a substrate, a first radiating portion, a second radiating portion and a feeding portion; the substrate is a square symmetrical structure; the first radiating portion is printed on the copper coating layer on the first surface of the substrate; the second radiating portion is printed on the copper coating layer on the second surface of the substrate; the feeding portion includes an RF coaxial cable core wire pad and an RF coaxial cable ground wire pad; the RF coaxial cable core wire pad is arranged at the center of the first radiating portion; the RF coaxial cable ground wire pad is arranged at the center of the second radiating portion; the first radiating portion includes four first radiators with 90-degree rotational symmetry; and the second radiating portion includes four second radiators with 90-degree rotational symmetry.

[0009] Preferably, the first radiator includes a coupling body, a 5G radiator, a 6G radiator, an impedance adjusting body, a first microstrip line and a second microstrip line, one end of the impedance adjusting body is connected to the core wire pad of the RF coaxial cable, and the other end is connected to the first microstrip line, one end of the second microstrip line is connected to the 6G radiator, and the other end is connected to the 5G radiator, and the coupling body is coupled to the 5G radiator.

[0010] Preferably, the second radiator includes a coupling body, a first radiator, a first microstrip line and a second radiator, one end of the first microstrip line is connected to the ground pad of the RF coaxial cable, and the other end is connected to the second radiator and the first radiator, and the coupling body is coupled to the radiator.

[0011] Preferably, the center of the substrate has a central opening, and the centers of the RF coaxial cable core wire pad and the RF coaxial cable ground wire pad both have openings corresponding to the central opening of the substrate.

[0012] Preferably, the substrate is a PCB board made of polytetrafluoroethylene with a dielectric constant of 4.4.

[0013] The dual-bandwidth antenna structure is adopted, and the dual-bandwidth antenna structure provided can cover two frequency bands at the same time, effectively reducing the number of required antennas, reducing structural complexity and cost. By designing a rotationally symmetrical first radiator and a second radiator, the present invention improves the radiation non-circularity of the antenna in the horizontal direction and improves the uniformity of signal coverage. The present invention effectively reduces the power loss of the 6G frequency band, improves the antenna radiation efficiency, reduces the dependence on high-frequency PCB boards, reduces costs, and improves the overall performance of the WiFi 7 antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a side view of the dual-bandwidth antenna structure of the present invention.

[0015] Figure 2 It is a structural schematic diagram of the first radiating portion of the dual-bandwidth antenna structure of the present invention.

[0016] Figure 3 It is a structural schematic diagram of the second radiating portion of the dual-bandwidth antenna structure of the present invention.

[0017] Figure 4 It is a structural schematic diagram of a substrate of a dual-bandwidth antenna structure of the present invention.

[0018] Figure 5 It is a schematic diagram of the first surface of the dual-bandwidth antenna structure of the present invention.

[0019] Figure 6 It is a schematic diagram of the second surface of the dual-bandwidth antenna structure of the present invention.

[0020] Figure 7 It is a schematic diagram of antenna return loss test data of the dual-bandwidth antenna structure of the present invention.

[0021] Figure 8 It is a schematic diagram of test data of the antenna radiation 3D pattern of the dual-bandwidth antenna structure of the present invention at 5.55 GHz.

[0022] Fig. 9 It is a schematic diagram of test data of the antenna radiation 3D pattern of the dual-bandwidth antenna structure of the present invention at 6.55 GHz.

[0023] Fig.10 It is a schematic diagram of test data of the 2D radiation pattern of the dual-bandwidth antenna structure of the present invention in the horizontal direction.

[0024] Fig.11 It is a schematic diagram of test data of the 2D radiation pattern in the vertical direction of the dual-bandwidth antenna structure of the present invention.

[0025] Reference numerals:

[0026] 100 substrates

[0027] 200 First Radiation

[0028] 300 Second Radiation

[0029] 400 Feeder

[0030] 101 center opening

[0031] 201 coupling body

[0032] 202 5G Radiator

[0033] 203 6G Radiator

[0034] 204 Second microstrip line

[0035] 205 First Microstrip Line

[0036] 206 Impedance Adjuster

[0037] 207 The first radiation part center opening

[0038] 301 coupling body

[0039] 302 First Radiator

[0040] 303 First Microstrip Line

[0041] 304 Second Radiator

[0042] 305 The center opening of the second radiation part

[0043] 401 RF coaxial cable core wire welding pad

[0044] 402 RF coaxial cable ground wire pad

[0045] 501 RF coaxial cable

[0046] 502 RF coaxial cable connector DETAILED DESCRIPTION

[0047] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0048] The dual-bandwidth antenna structure of the present invention includes a substrate 100, a first radiating portion 200, a second radiating portion 300 and a feeding portion 400, wherein the substrate 100 is a square symmetrical structure, the first radiating portion 200 is printed on the copper coating layer on the first surface of the substrate 100, the second radiating portion 300 is printed on the copper coating layer on the second surface of the substrate 100, the feeding portion 400 includes an RF coaxial cable core wire pad 401 and an RF coaxial cable ground wire pad 402, the RF coaxial cable core wire pad 401 is arranged at the center of the first radiating portion 200, the RF coaxial cable ground wire pad 402 is arranged at the center of the second radiating portion 300, the first radiating portion 200 includes four first radiators with 90-degree rotational symmetry, and the second radiating portion 300 includes four second radiators with 90-degree rotational symmetry.

[0049] As a preferred embodiment of the present invention, the first radiator includes a coupling body 201, a 5G radiator 202, a 6G radiator 203, an impedance adjusting body 206, a first microstrip line 205 and a second microstrip line 204, one end of the impedance adjusting body 206 is connected to the RF coaxial cable core wire pad 401, and the other end is connected to the first microstrip line 205, one end of the second microstrip line 204 is connected to the 6G radiator 203, and the other end is connected to the 5G radiator 202, and the coupling body 201 is coupled to the 5G radiator 202.

[0050] As a preferred embodiment of the present invention, the second radiator includes a coupling body 301, a first radiator 302, a first microstrip line 303 and a second radiator 304, one end of the first microstrip line 303 is connected to the RF coaxial cable ground pad 402, and the other end is connected to the second radiator 304 and the first radiator 302, and the coupling body 301 is coupled to the radiator 302.

[0051] As a preferred embodiment of the present invention, the substrate 100 has a central opening 101 at its center, and the RF coaxial cable core wire pad 401 and the RF coaxial cable ground wire pad 402 both have openings 207 and 305 at their centers, corresponding to the central opening 101 of the substrate 100 .

[0052] As a preferred embodiment of the present invention, the substrate 100 is a PCB board made of polytetrafluoroethylene with a dielectric constant of 4.4.

[0053] In the specific implementation of the present invention, a dual-bandwidth antenna is designed, and the number of antennas is reduced by half, providing a basis for product miniaturization. The present invention designs the antenna into a 4-dipole form to further meet the requirements of the terminal product for horizontal user wireless coverage. The present invention reduces antenna loss through a special antenna vibrator structure design, allowing ordinary PCB boards to be used in high frequency bands, and the antenna radiation efficiency can reach more than 65%.

[0054] The antenna structure 1000 of the present invention includes a substrate 100 , a first radiating portion 200 , a second radiating portion 300 , and a feeding portion 400 .

[0055] The substrate 100 in this embodiment is preferably a PCB (printed circuit board) with a length of 30 mm, a width of 30 mm, and a thickness of 1 mm. The material of the PCB is polytetrafluoroethylene (FR4) with a dielectric constant of 4.4. With the above dimensions, the antenna structure formed is small in size and easy to integrate into other devices. The use of FR4 material is low in cost. In this embodiment, the first radiating portion 200, the second radiating portion 300, and the feeding portion 400 are preferably all copper coating layers printed on the first surface and the second surface of the substrate 100, such as copper foil, with a thickness of 1 ounce.

[0056] The substrate 100 is a square symmetrical structure. The central opening 101 is used for the core wire of the coaxial cable to pass through the substrate 100 and then be welded to the core wire pad 401 of the RF coaxial cable and to the first radiating portion 200 .

[0057] The first radiating portion 200 is located on the first surface of the substrate 100, and one end of the first microstrip line 205 is connected to the impedance adjustment portion 206, and the other end is connected to the 6G radiator 203. One end of the second microstrip line 204 is connected to the 6G radiator 203, and the other end is connected to the 5G radiator 202. The coupling body 201 is coupled to the 5G radiator 202 to increase the antenna bandwidth. The first radiating portion 200 is distributed in a 90-degree rotational symmetry.

[0058] The second radiating portion 300 is located on the second surface of the PCB, and one end of the first microstrip line 303 is connected to the RF coaxial cable ground pad 402 of the feeding portion 400, and the other end is connected to the radiator 304 and the radiator 302. The coupling body 301 is coupled with the radiator 302 to increase the antenna bandwidth. The second radiating portion 300 is symmetrically distributed at 90 degrees.

[0059] The feeding unit 400 includes a radio frequency coaxial cable core wire pad 401 and a radio frequency coaxial cable ground wire pad 402 .

[0060] The present invention adds a coupling body 201 next to the radiator to improve the antenna bandwidth.

[0061] The working principle of the antenna structure 1000 is described below. As described above, the radiating portion 202 and the radiating portion 302, and the radiating portion 203 and the radiating portion 304 respectively form a dual-frequency antenna in the form of a quarter-wavelength dipole, and the other three radiators in the symmetrical direction respectively cover another 270 degree angle, and the non-circularity of the antenna in the horizontal direction is smaller.

[0062] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0063] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0064] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] The dual-bandwidth antenna structure is adopted, and the dual-bandwidth antenna structure provided can cover two frequency bands at the same time, effectively reducing the number of required antennas, reducing structural complexity and cost. By designing a rotationally symmetrical first radiator and a second radiator, the present invention improves the radiation non-circularity of the antenna in the horizontal direction and improves the uniformity of signal coverage. The present invention effectively reduces the power loss of the 6G frequency band, improves the antenna radiation efficiency, reduces the dependence on high-frequency PCB boards, reduces costs, and improves the overall performance of the WiFi 7 antenna.

[0067] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A dual-bandwidth antenna structure, characterized in that: The structure includes a substrate, a first radiating portion, a second radiating portion and a feeding portion. The substrate is a square symmetrical structure. The first radiating portion is printed on the copper coating layer on the first surface of the substrate, and the second radiating portion is printed on the copper coating layer on the second surface of the substrate. The feeding portion includes an RF coaxial cable core wire pad and an RF coaxial cable ground wire pad. The RF coaxial cable core wire pad is arranged at the center of the first radiating portion, and the RF coaxial cable ground wire pad is arranged at the center of the second radiating portion. The first radiating portion includes four first radiators with 90-degree rotational symmetry, and the second radiating portion includes four second radiators with 90-degree rotational symmetry.

2. The dual-bandwidth antenna structure according to claim 1, characterized in that: The first radiator includes a coupling body, a 5G radiator, a 6G radiator, an impedance adjusting body, a first microstrip line and a second microstrip line. One end of the impedance adjusting body is connected to the core wire pad of the RF coaxial cable, and the other end is connected to the first microstrip line. One end of the second microstrip line is connected to the 6G radiator, and the other end is connected to the 5G radiator. The coupling body is coupled to the 5G radiator.

3. The dual-bandwidth antenna structure according to claim 1, characterized in that: The second radiator includes a coupling body, a first radiator, a first microstrip line and a second radiator. One end of the first microstrip line is connected to the ground pad of the RF coaxial cable, and the other end is connected to the second radiator and the first radiator. The coupling body is coupled to the radiator.

4. The dual-bandwidth antenna structure according to claim 1, characterized in that: The center of the substrate has a central opening, and the centers of the radio frequency coaxial cable core wire pad and the radio frequency coaxial cable ground wire pad both have openings corresponding to the central opening of the substrate.

5. The dual-bandwidth antenna structure according to claim 4, characterized in that: The substrate is a PCB board made of polytetrafluoroethylene with a dielectric constant of 4.4.

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