WiFi (Wireless Fidelity) MIMO (Multiple Input Multiple Output) antenna applied to Wlan (Wireless Local Area Network)

Abstract

The invention discloses a WiFi (Wireless Fidelity) MIMO (Multiple Input Multiple Output) antenna applied to a WLAN (Wireless Local Area Network). The WiFi (Wireless Fidelity) MIMO antenna comprises a dielectric substrate and four radiating antennas arranged on the same surface of the dielectric substrate, the four radiating antennas are distributed in a central symmetry manner by taking the center of the dielectric substrate as the center; the central position of the dielectric substrate is provided with a cross-shaped slot, and a cross-shaped metal isolation support is arranged above the cross-shaped slot. The four radiation antennas are respectively arranged on extension lines of four branch ends of the cross-shaped groove, and the four radiation antennas are respectively arranged in four sectors formed by separation of the cross-shaped metal isolation support in a one-to-one manner. According to the invention, by supporting a wider 320MHz bandwidth and 4096-QAM high-order modulation, a data transmission rate higher than that of the existing WIFI 6 technology can be realized.

Description

Technical Field

[0001] The present invention relates to, and in particular to, a MIMO antenna applied to a Wlan wireless local area network WiFi7. Background Art

[0002] As a new generation of wireless LAN technology, WIFI7 technology is designed to achieve higher data transmission rates, lower latency and stronger high-density access capabilities. The WIFI7 technology standard, namely IEEE 802.11be, aims to push Wi-Fi performance to new heights through new physical layer and data link layer technologies to better support the development of emerging applications such as virtual reality and ultra-high-definition video. The main features of WIFI7 technology include support for wider 320MHz bandwidth, 4096-QAM modulation, MIMO 16X16 transmission and multi-link operation (Multi-Link Operation, MLO). The combination of these technologies enables the theoretical maximum rate of WIFI7 to reach 46.1Gbps, while reducing latency to less than 5ms. These features are crucial to meeting the future demand for wireless communication bandwidth, especially in high-density environments such as stadiums and conference centers.

[0003] MIMO technology plays an important role in WIFI7. MIMO (Multiple Input Multiple Output) technology improves the transmission rate and reliability of wireless signals by using multiple transmit and receive antennas. MIMO technology in WIFI7 is expected to support more spatial streams, thereby further improving data transmission rates and network capacity. At present, WIFI7 technology is in a rapid development stage, and major manufacturers are actively developing related hardware and software solutions. For example, Qualcomm has launched RF front-end modules that support WIFI7, which can be applied to a variety of terminal categories such as smartphones, automobiles, PCs, and wearable devices. These modules are designed to support the coexistence of 5G and WIFI and provide higher wireless connection performance. In addition, WIFI7 technology will continue to promote the development of RF front-end technology. With the advancement of wireless communication technology, the design of RF front-end has become more and more complex, and more antennas are required to support higher-order MIMO technology. This not only increases the number and cost of components in the RF front-end, but also poses higher design challenges to RF engineers.

[0004] In summary, the current status of the background technology of WIFI7 MIMO antenna shows that the technology is developing towards higher speed, lower latency and stronger high-density access capability. With the continuous maturity of related technologies and the continuous expansion of application scenarios, WIFI7 is expected to become the mainstream standard of wireless LAN technology in the next few years.

[0005] However, the design and implementation of WIFI7 MIMO antennas involve complex electromagnetic theory and RF front-end technology. With the development of MIMO technology, antenna design needs to support more spatial streams, which increases the complexity of implementation. Although WIFI7 improves spectrum efficiency by using a wider 320MHz bandwidth and multi-link operation (MLO) technology, the available spectrum resources are still limited. In a crowded spectrum environment, how to effectively use spectrum resources, avoid interference and improve signal quality remains a challenge. The design goal of WIFI7 is to provide higher data transmission rates and lower latency, but this also means that it needs to be compatible with existing WIFI6 and other older versions of WIFI standards. In actual deployment, ensuring backward compatibility may limit the performance of WIFI7 antennas. As the frequency increases, the propagation loss of the signal also increases, especially in the 6GHz band. This may affect the coverage and signal quality of WIFI7 MIMO antennas, especially in environments with obstacles or multipath propagation. Although WIFI7 provides significant performance improvements, it usually takes time for the market to accept and adopt new technologies. Users and businesses may be cautious about the cost and complexity of upgrading existing network equipment and infrastructure. Summary of the invention

[0006] The purpose of the present invention is to provide a MIMO antenna for Wlan wireless local area network WiFi7 to meet the growing demand for wireless networks, especially in terms of data transmission rate, network capacity, delay and reliability.

[0007] The technical solution adopted by the present invention is: A MIMO antenna for Wlan wireless local area network WiFi7, comprising a dielectric substrate and four radiating antennas arranged on the same surface of the dielectric substrate; the four radiating antennas are centrally symmetrically distributed with respect to the center of the dielectric substrate; a cross-shaped slot is provided at the center of the dielectric substrate, and a cross-shaped metal isolation bracket is provided above the cross-shaped slot; the four radiating antennas are respectively arranged on the extension lines of the four branch ends of the cross-shaped slot, and the four radiating antennas are respectively arranged one by one on four sectors separated by the cross-shaped metal isolation bracket.

[0008] Furthermore, the cross-shaped metal isolation bracket and the cross-shaped slot are arranged on the same axis and staggered at 45 degrees in the horizontal position, so that the top projection of the cross-shaped metal isolation bracket on the dielectric substrate forms a cross-shaped shape with the cross-shaped slot.

[0009] Furthermore, the cross-shaped slot includes a first rectangular slot and a second rectangular slot, and the first rectangular slot and the second rectangular slot are arranged to cross each other at 90 degrees.

[0010] Furthermore, the first rectangular slot and the second rectangular slot are both slots of 46 mm*2 mm.

[0011] Furthermore, the dielectric substrate adopts a circular substrate with an outer radius of 53 mm; Furthermore, the cross-shaped metal isolation bracket includes a first door frame metal isolation bracket and a second door frame metal isolation bracket which are vertically inserted into the dielectric substrate in a plug-in manner; the first door frame metal isolation bracket and the second door frame metal isolation bracket are cross-arranged to form a cross-shaped metal isolation bracket.

[0012] Furthermore, a first embedding groove is provided on the upper end surface of the middle cross bar of the first door frame metal isolation bracket, and a second embedding groove is provided on the lower end surface of the middle cross bar of the second door frame metal isolation bracket; through the embedding cooperation of the first embedding groove and the second embedding groove, the first door frame metal isolation bracket and the second door frame metal isolation bracket are partially embedded in each other when they are cross-arranged.

[0013] Furthermore, the first door frame metal isolation bracket and the second door frame metal isolation bracket are arranged at 90 degrees.

[0014] Furthermore, the four radiating antennas are made of metal material.

[0015] Furthermore, the four radiating antennas are PIFA antenna structures, and each radiating antenna includes a radiating bottom plate, a radiating side plate and a radiating top plate. The radiating bottom plate can be detachably mounted on the dielectric substrate, and the radiating side plate is vertically arranged on the side of the radiating bottom plate; one side of the radiating top plate is fixed to the upper end of the radiating side plate and is arranged parallel to the radiating bottom plate; an end corner groove is provided on the side of the radiating top plate facing the center of the dielectric substrate and away from the radiating side edge, and a center groove is provided in the middle position of the radiating top plate, and the center groove is connected to the end corner groove portion.

[0016] Furthermore, the corner slots and the center slot are both rectangular slots.

[0017] The present invention adopts the above technical solution and has the following advantages compared with the prior art: 1. The antenna design of the present invention focuses on miniaturization and integration, which is easy to implement in mobile devices and compact devices, and meets the strict space requirements of modern electronic devices. Higher data transmission rate: 2. The present invention can achieve a higher data transmission rate than the existing WIFI6 technology by supporting a wider 320MHz bandwidth and 4096-QAM high-order modulation; 3. The present invention takes into account the compatibility with existing WIFI technology, and at the same time has good scalability, and can adapt to the development of future technologies and the introduction of new frequency bands; 4. The present invention is not only suitable for traditional WLAN application scenarios, but also can support emerging Internet of Things, Internet of Vehicles, Industrial Internet and other applications, and has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments; Figure 1 A schematic diagram of the three-dimensional structure of a MIMO antenna applied to a Wlan wireless local area network WiFi7 of the present invention; Figure 2 This is a schematic diagram of a top view structure of a MIMO antenna applied to a Wlan wireless local area network WiFi7 of the present invention; Figure 3 It is a schematic structural diagram of the first door frame metal isolation bracket of the present invention; Figure 4 It is a schematic structural diagram of the second door frame metal isolation bracket of the present invention; Figure 5 It is a schematic diagram of the reflection coefficient (S11 parameter) of the antenna structure of the present invention in the 2.4G frequency band; Figure 6 It is a schematic diagram of the reflection coefficient (S11 parameter) of the antenna structure of the present invention in the 5.15G to 7.125G frequency band. Implementation

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0020] like Figures 1 to 6 As shown in one, the present invention discloses a MIMO antenna applied to Wlan wireless local area network WiFi7, comprising a dielectric substrate 1 and four radiating antennas 2 arranged on the same surface of the dielectric substrate 1; the four radiating antennas 2 are centrally symmetrically distributed with respect to the center of the dielectric substrate 1; a cross-shaped slot 3 is provided at the center of the dielectric substrate 1, and a cross-shaped metal isolation bracket 4 is provided above the cross-shaped slot 3; the four radiating antennas 2 are respectively arranged on the extension lines of the four branch ends of the cross-shaped slot 3, and the four radiating antennas 2 are respectively arranged one by one on four sectors separated by the cross-shaped metal isolation bracket 4.

[0021] Furthermore, the cross-shaped metal isolation bracket 4 and the cross-shaped slot 3 are arranged on the same axis and staggered at 45 degrees in the horizontal position, so that the top projection of the cross-shaped metal isolation bracket 4 on the dielectric substrate 1 forms a cross-shaped shape with the cross-shaped slot 3.

[0022] Furthermore, the cross-shaped slot 3 includes a first rectangular slot 5 and a second rectangular slot 6, and the first rectangular slot 5 and the second rectangular slot 6 are arranged to cross each other at 90 degrees.

[0023] Furthermore, the first rectangular slot 5 and the second rectangular slot 6 are both slots of 46 mm*2 mm.

[0024] Furthermore, the dielectric substrate 1 is a circular substrate with an outer radius of 53 mm; Furthermore, the cross-shaped metal isolation bracket 4 includes a first door frame metal isolation bracket 7 and a second door frame metal isolation bracket 8 which are vertically inserted into the dielectric substrate 1 in a plug-in manner; the first door frame metal isolation bracket 7 and the second door frame metal isolation bracket 8 are cross-arranged to form the cross-shaped metal isolation bracket 4.

[0025] Furthermore, if Figure 3 and Figure 4 As shown, the upper end surface of the middle cross bar of the first door frame metal isolation bracket 7 is provided with a first embedding groove 9, and the lower end surface of the middle cross bar of the second door frame metal isolation bracket 8 is provided with a second embedding groove 10; through the embedding cooperation of the first embedding groove 9 and the second embedding groove 10, the first door frame metal isolation bracket 7 and the second door frame metal isolation bracket 8 are partially embedded in each other when they are cross-arranged.

[0026] Furthermore, the first door frame metal isolation bracket 7 and the second door frame metal isolation bracket 8 are arranged at 90 degrees.

[0027] Furthermore, the four radiating antennas 2 are made of metal material.

[0028] Furthermore, the four radiating antennas 2 are PIFA antenna structures, each of which includes a radiating bottom plate 21, a radiating side plate 22 and a radiating top plate 23. The radiating bottom plate 21 can be detachably attached to the dielectric substrate 1, and the radiating side plate 22 is vertically set on the side of the radiating bottom plate 21; one side of the radiating top plate 23 is fixed to the upper end of the radiating side plate 22 and is arranged parallel to the radiating bottom plate 21; the radiating top plate 23 is provided with an end angle slot 24 at one side facing the center of the dielectric substrate 1 and away from the radiating side, and a central slot 25 is provided in the middle position of the radiating top plate 23, and the central slot 25 is partially connected with the end angle slot 24; a connecting vertical plate 26 is provided on the middle bottom surface of the radiating top plate 23 corresponding to the central slot 25 and close to the center of the dielectric substrate, and a feeding point is arranged between the lower end of the connecting vertical plate 26 and the radiating bottom plate 21. Both the end angle slot 24 and the central slot 25 are rectangular slots.

[0029] Specifically, the miniaturized 4*4MIMO WiFi7 antenna of the present invention is arranged on a circular PCB-FR4 with a radius of 53mm, with 4 PIFA WiFi7 antenna arrays, made of nickel silver, providing high-efficiency and high-gain support. The present invention is miniaturized, and the antenna array is configured to operate on the 2.4GHz, 5GHz and 6GHz frequency bands; the antenna array includes 4 antenna elements to support 4×4 MIMO operation; the antenna structure adopts a PIFA structure, each with 2.4GHz, 5GHz and 6GHz frequency band branches; the first rectangular slot 5 and the second rectangular slot 6 improve isolation and reduce mutual coupling effects; the first door frame metal isolation bracket 7 and the second door frame metal isolation bracket 8 improve isolation and reduce mutual coupling effects.

[0030] The present invention adopts the above technical solution and has the following advantages: 1. The antenna design of the present invention focuses on miniaturization and integration, which is easy to implement in mobile devices and compact devices, and meets the strict space requirements of modern electronic devices. Higher data transmission rate: 2. The present invention can achieve a higher data transmission rate than the existing WIFI6 technology by supporting a wider 320MHz bandwidth and 4096-QAM high-order modulation; 3. The present invention takes into account the compatibility with existing WIFI technology, and at the same time has good scalability, and can adapt to the development of future technologies and the introduction of new frequency bands; 4. The present invention is not only suitable for traditional WLAN application scenarios, but also can support emerging Internet of Things, Internet of Vehicles, Industrial Internet and other applications, and has broad market application prospects.

[0031] Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application.

Claims

1. A MIMO antenna for Wlan wireless local area network WiFi7, characterized by: It includes a dielectric substrate and four radiating antennas arranged on the same surface of the dielectric substrate; the four radiating antennas are distributed in a centrally symmetrical manner with respect to the center of the dielectric substrate; a cross-shaped slot is opened at the center of the dielectric substrate, and a cross-shaped metal isolation bracket is arranged above the cross-shaped slot; the four radiating antennas are respectively arranged on the extension lines of the four branch ends of the cross-shaped slot, and the four radiating antennas are respectively arranged one by one on four sectors separated by the cross-shaped metal isolation bracket.

2. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 1, characterized in that: The cross-shaped metal isolation bracket and the cross-shaped slot are arranged on the same axis and staggered at 45 degrees in the horizontal position, so that the top projection of the cross-shaped metal isolation bracket on the dielectric substrate forms a cross-shaped shape with the cross-shaped slot.

3. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 1, characterized in that: The cross-shaped slot includes a first rectangular slot and a second rectangular slot, and the first rectangular slot and the second rectangular slot are arranged to cross each other at 90 degrees.

4. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 2, characterized in that: The first rectangular slot and the second rectangular slot are both 46mm*2mm slots.

5. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 1, characterized in that: The cross-shaped metal isolation bracket comprises a first door frame metal isolation bracket and a second door frame metal isolation bracket which are vertically inserted on the dielectric substrate in a plug-in manner; the first door frame metal isolation bracket and the second door frame metal isolation bracket are cross-arranged to form a cross-shaped metal isolation bracket.

6. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 5, characterized in that: A first embedding groove is provided on the upper end surface of the middle cross bar of the first door frame metal isolation bracket, and a second embedding groove is provided on the lower end surface of the middle cross bar of the second door frame metal isolation bracket; through the embedding cooperation of the first embedding groove and the second embedding groove, the first door frame metal isolation bracket and the second door frame metal isolation bracket are partially embedded in each other when they are cross-arranged.

7. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 1, characterized in that: The dielectric substrate adopts a circular substrate with an outer radius of 53 mm.

8. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 1, characterized in that: The four radiating antennas are made of metal.

9. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 1, characterized in that: The four radiating antennas are PIFA antenna structures. Each radiating antenna includes a radiating bottom plate, a radiating side plate and a radiating top plate. The radiating bottom plate can be detachably attached to the dielectric substrate, and the radiating side plate is vertically arranged on the side of the radiating bottom plate; one side of the radiating top plate is fixed to the upper end of the radiating side plate and is arranged parallel to the radiating bottom plate; an end corner groove is provided on the side of the radiating top plate facing the center of the dielectric substrate and away from the radiating side edge, and a center groove is provided in the middle position of the radiating top plate, and the center groove is connected to the end corner groove portion.

10. The MIMO antenna for Wi-Fi 7 wireless local area network according to claim 9, characterized in that: The corner slots and the center slots are both rectangular slots.

Images