Close-range double-WIFI antenna isolation optimization structure

Abstract

The invention discloses a short-distance double-WIFI antenna isolation optimization structure, and belongs to the field of short-distance communication application. By adding isolation metal and optimizing the size and layout of a metal groove, the close-range dual-WiFi antenna isolation optimization structure realizes high-performance expression that the isolation degree is less than-35dB under dual frequency bands of 2.4 GHz and 5GHz in a compact space, ensures that the antenna efficiency is greater than 40%, not only improves the signal quality and the space utilization rate of equipment, but also has flexible tuning capability, and is suitable for wide application and popularization. And the system adapts to various application scenes, is easy to assemble, and has a relatively good practical value.

Description

Technical Field

[0001] The present application relates to the field of short-range communication applications, and in particular to an optimized isolation structure for short-range dual WIFI antennas. Background Art

[0002] With the progress of society and the development of science and technology, people have higher requirements for the stability and efficiency of communication systems. Under this trend, the requirements for antenna isolation are also increasing. For example, there is a demand for WIFI antenna isolation in smart homes, the Internet of Things, or mobile communications.

[0003] High-isolation antenna systems help improve network capacity and users' Internet experience, and enhance the user experience of different users using the same device at the same time. They have a positive impact on signal coverage and speed. Currently, the isolation in the industry can generally reach -20 to -25dB.

[0004] In the related art, in order to improve the isolation, design ideas such as increasing the antenna distance or orthogonal polarization are adopted, but these design ideas require a large space and are difficult to implement in a limited space. Therefore, a design structure that can improve the antenna isolation in a limited space is needed. Summary of the invention

[0005] The embodiment of the present application provides a short-range dual WIFI antenna isolation optimization structure. The technical solution is as follows:

[0006] According to one aspect of the present application, a short-range dual WIFI antenna isolation optimization structure is provided, characterized in that the structure includes dual WiFi antennas, isolation metal, a metal slot Slot and a supporting structure;

[0007] The two antennas in the dual WiFi antenna are separated by the isolation metal, the isolation metal is placed at the ends of the antennas, and the isolation metal is used to reduce signal interference between the antennas;

[0008] The metal slot Slot surrounds the dual WiFi antennas and the isolation metal, and the metal slot Slot is used to match the target frequency band of the signal after the circumference of the slot is adjusted;

[0009] The support structure is in direct contact with the dual WiFi antennas and the isolation metal to provide structural support.

[0010] Optionally, two antennas of the dual WiFi antennas support working in dual frequency bands of 2.4 GHz and 5 GHz;

[0011] The voltage standing wave ratio of the dual WiFi antenna is less than 2, and the dual frequency band ranges are 2400-2500MHz and 5100-5900MHz respectively.

[0012] Optionally, the distance between the two antennas in the dual WiFi antenna is 75 mm.

[0013] Optionally, in response to the dual WiFi antenna supporting dual-band operation, at least two metal slots are provided, and each metal slot is optimized for a wavelength of a different frequency band.

[0014] Optionally, the size of the isolation metal is 20 mm long x 16 mm wide x 0.4 mm thick.

[0015] Optionally, the support structure is mounted on a mounting plate of the dual WiFi antenna or an internal frame of the device, and is in direct contact with the dual WiFi antenna and the isolation metal.

[0016] Optionally, the metal slot is obtained by drilling a hole or digging a groove in metal.

[0017] Optionally, the dual WiFi antennas are connected to a network analyzer, and the isolation measurement between the dual WiFi antennas is achieved through the network analyzer connection.

[0018] In an embodiment of the present application, a close-range dual WiFi antenna isolation optimization structure is provided, which includes dual WiFi antennas, isolation metal, metal slots and support structures. The close-range dual WiFi antenna isolation optimization structure achieves high performance with an isolation degree of less than -35dB in the 2.4GHz and 5GHz dual frequency bands in a compact space by increasing isolation metal and optimizing the size and layout of the metal slots, while ensuring that the antenna efficiency is greater than 40%. It not only improves the signal quality and space utilization of the equipment, but also has flexible tuning capabilities, adapts to a variety of application scenarios, and is easy to assemble, with good practical value. As a result, the close-range dual WiFi antenna isolation optimization structure supports dual-band compatibility through an integrated isolation metal design, a precisely adjusted metal slot layout, and dual-band compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of a short-range dual WIFI antenna isolation optimization structure provided by an exemplary embodiment of the present application;

[0020] Figure 2 is a schematic diagram of antenna positions provided by an exemplary embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of an isolation metal size structure provided by an exemplary embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the size structure of a metal slot provided in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0024] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0025] like Figure 1 As shown, a short-range dual WIFI antenna isolation optimization structure is provided, which includes dual WiFi antennas, isolation metal, a metal slot and a supporting structure.

[0026] exist Figure 1 The dual WiFi antennas are marked as ANT1 (number 01) and ANT1 (number 02), the isolation metal is marked as 03, the metal slot is marked as 04, the supporting structure is marked as 05, and number 06 is the structure body, which will not be repeated in subsequent diagrams.

[0027] First, there are dual WiFi antennas (ANT1 and ANT2), two antennas for transmitting and receiving signals, supporting operation in the 2.4GHz and 5GHz dual-bands. In a possible implementation, the VSWR (voltage standing wave ratio) of the dual WiFi antennas is less than 2 to ensure signal transmission efficiency. The dual-band ranges are 2400-2500MHz and 5100-5900MHz, respectively, with an isolation better than -35dB.

[0028] The two antennas in the dual WiFi antenna are separated by the isolation metal 03 , and the isolation metal 03 is placed at the ends of the antennas. The isolation metal is used to reduce interference between the antennas.

[0029] As shown in 2, Figure 2The schematic diagram of the antenna position is shown. The distance between the two antennas (ANT1 and ANT2) can be 75mm, which can effectively reduce mutual interference. One of the functions is that at a spacing of 75mm, by adding isolation metal and adjusting the size of the metal slot, the antenna isolation can reach a high isolation effect of less than -35dB, reducing signal crosstalk and ensuring communication quality; the second function is that the spacing of 75mm is relatively small, which is suitable for the design requirements of compact equipment, especially in the case of limited space. Such a spacing not only meets the high isolation requirements, but also effectively utilizes the space; the third function is that the design works in the 2.4GHz and 5GHz dual-bands. By adjusting the antenna spacing, isolation metal and slot size, the system can maintain good isolation and signal transmission efficiency in both frequency bands.

[0030] Of course, 75mm is not an absolutely necessary fixed spacing, but a design parameter that has been proven to be effective in this patent. As long as certain isolation requirements and frequency band support conditions are met, the spacing can be adjusted appropriately according to actual needs. The following are some factors and conditions that can be considered in the design.

[0031] Isolation requirements. For example, if the target isolation is less than -35dB. If the antenna spacing is changed, ensure that the adjusted isolation still meets the requirement. Isolation can be optimized by increasing or decreasing isolation metal, adjusting the size of the metal slot, etc., so the spacing can be slightly shortened or increased, but it is necessary to verify whether sufficient isolation can still be achieved.

[0032] Space limitations. The 75mm spacing is designed to accommodate the space requirements of compact devices. If the device has more space, the spacing can be increased appropriately to further improve isolation. In devices with very limited space, if the spacing must be reduced, the isolation metal and slot design must be optimized to compensate for the potential increase in interference due to the shortened distance.

[0033] Working frequency band. The sensitivity of antenna isolation varies in different frequency bands. The dual-band design of 2.4GHz and 5GHz performs better at a spacing of 75mm. If the frequency band requirements change or work in a single frequency band, the spacing can also be redesigned and optimized.

[0034] Therefore, the present application optimizes the isolation by isolating metal and slots, so the distance can be slightly adjusted to adapt to actual applications. Of course, when technical personnel in this field adjust the spacing, any spacing adjustment must be verified and tested to ensure that the design goals can still be achieved. When adjusting the spacing, it is necessary to comprehensively consider the design of the isolation metal and the metal slot to ensure that the antenna performance and isolation meet the expected standards.

[0035] For the isolation metal, physical shielding is achieved by adding isolation metal at the ends of the two antennas to reduce electromagnetic interference between the antennas. Figure 3 The figure shows a schematic diagram of the size structure of an isolation metal. In the example, the size of the isolation metal is 20mm (length) x 16mm (width) x 0.4mm (thickness). Therefore, the optimized structural design with isolation metal added at the ends of the two antennas can achieve an isolation degree of less than -35dB, improving the signal independence of the antenna in a limited space.

[0036] The metal slot Slot surrounds the dual WiFi antennas and the isolation metal. The metal slot Slot is used to reduce signal interference in isolation after adjusting the circumference of the slot. The surrounding metal slots are optimized in size to enhance the isolation effect, and the target frequency band is matched by adjusting the length of the slot. In an example, Figure 4 The figure shows a schematic diagram of the size structure of a metal slot. In the example, the size of the metal slot is 25mm x 6mm, and there are four in total.

[0037] The above adjustment of the circumference of the metal slot to optimize the isolation effect in different frequency bands is a method of enhancing isolation by changing the size and position of the slot to match its resonance characteristics with the target frequency band. The following are some specific examples and adjustment methods.

[0038] The resonant frequency of the metal slot is related to its circumference, and generally follows the following relationship, f=c / λ, where f is the resonant frequency, c is the speed of light, and λ is the effective wavelength of the metal slot.

[0039] By adjusting the circumference of the slot (ie, adjusting the size of the slot), it can be made to resonate at a target frequency, thereby enhancing the absorption or reflection of the frequency signal and optimizing the isolation.

[0040] For the 2.4GHz frequency band, the wavelength of 2.4GHz is about 125mm. The circumference of the metal slot can be adjusted to an integer component of the target frequency, such as 1 / 2 wavelength or 1 / 4 wavelength. If the circumference of the slot is adjusted to 1 / 2 wavelength, the circumference is approximately equal to 125 / 2=62.5mm. If the circumference of the slot is adjusted to 1 / 4 wavelength, the circumference is approximately equal to 125 / 4=31.25mm. Therefore, by adjusting the slot circumference to 122mm (close to the integer component of 125mm), the isolation is improved from -20dB to -30dB.

[0041] For the 5GHz frequency band, the wavelength of 5GHz is about 60mm, and the circumference of the slot can be adjusted to 1 / 2 wavelength, which is approximately equal to 60 / 2=30mm. The circumference of the slot can also be adjusted to 1 / 4 wavelength, which is approximately equal to 60 / 4=15mm. Therefore, by adjusting the length and width of the metal slot to integer components close to 30mm or 15mm respectively, the resonance effect of the 5GHz frequency band can be enhanced, thereby improving the antenna isolation.

[0042] If both 2.4GHz and 5GHz are supported, i.e. dual-band optimization, multiple slots can be designed, each slot being optimized for 1 / 2 wavelength or 1 / 4 wavelength of different frequency bands. For example: design a 122mm slot to optimize the 2.4GHz band, and design a 30mm slot to optimize the 5GHz band.

[0043] Next, the implementation steps for optimization are described below.

[0044] First, calculate the wavelength of the target frequency band, which is 125 mm for 2.4 GHz and 60 mm for 5 GHz.

[0045] Furthermore, the appropriate slot length is selected. The slot circumference is designed according to 1 / 2 or 1 / 4 wavelength of the target frequency band. Of course, the circumference is not a fixed value and can be slightly adjusted (±5%) to match the environmental changes in the actual device.

[0046] Then, test and verify the isolation between antennas (S21 parameter) using a network analyzer to adjust the perimeter and position of the slot, observe the change in isolation, and find the optimal design.

[0047] In addition, the following key points need to be noted. The resonant frequency of the slot will be affected by the surrounding metal environment and the distance between the antennas, so it is necessary to fine-tune the design according to the actual test environment. In dual-band devices, multiple slots or composite slots with multiple resonant points can be designed. Through the above methods, the length of the slot can be accurately adjusted to match different target frequency bands and effectively improve the isolation between the dual WiFi antennas.

[0048] The support structure is in direct contact with the dual WiFi antennas and the isolation metal to provide structural support, such as fixing the positions of the antennas and the isolation metal to ensure structural stability and space utilization efficiency.

[0049] Among them, the supporting structure is used to provide structural support, maintain the physical stability and spatial layout of the antenna and the isolation metal, ensure the accuracy of the relative position of the isolation metal and the antenna, make the entire antenna system easy to assemble, and effectively save space, suitable for application inside compact equipment.

[0050] The support structure is located at the bottom or around the dual WiFi antenna and is used to fix the positional relationship between the antenna body, the isolation metal, and the metal slot. It not only provides physical support for the antenna and the isolation metal, but also ensures that the metal slot and the antenna maintain precise spatial distribution through integration with the internal frame or shell of the device, thereby achieving a stable isolation effect and good signal transmission performance.

[0051] In a possible implementation, the support structure is usually mounted on the mounting plate of the antenna or the internal frame of the device, directly contacts the antenna and the isolation metal, and provides structural support. Through precise positioning, it is ensured that the spacing between the antennas (such as 75mm), the position and angle of the isolation metal, and the peripheral layout of the metal groove will not change, so that the isolation effect of the design can be maintained even when the device moves or vibrates.

[0052] In summary, the present invention provides a close-range dual WiFi antenna isolation optimization structure, which has the following technical effects.

[0053] High isolation optimization effect. By adding isolation metal between the two antennas and optimizing the design of the surrounding metal slots (the circumference is adjusted to about 122mm, close to the wavelength of the 2.4GHz frequency band), a high level of isolation is achieved. As a result, in the 2.4GHz and 5GHz dual-bands, the isolation between antennas is increased from the initial -20dB to the optimized -35dB and below, significantly reducing the electromagnetic interference between the dual antennas and improving signal quality and system stability.

[0054] Dual-band support. The structural design is compatible with 2.4GHz (2400-2500MHz) and 5GHz (5100-5900MHz) dual-bands. Therefore, in these two frequency bands, not only does the isolation meet the high requirement of <-35dB, but the antenna efficiency is maintained at more than 40%, ensuring communication quality and coverage.

[0055] Improved space utilization. The antenna spacing is only 75mm, and the combination of isolation metal and slot layout achieves efficient isolation optimization in a limited space. Therefore, compared with the traditional design of increasing antenna spacing or orthogonal polarization, this application can significantly reduce the space required for antenna layout and meet the needs of miniaturized devices.

[0056] Innovation of tunable design. The size and position of the slot are tuned to match the 2.4GHz and 5GHz frequency bands, and the isolation is improved by adjusting the slot perimeter (such as adjusting from the theoretical wavelength of 125mm to 122mm). The isolated metal design is integrated with the antenna, avoiding complex installation or additional adjustment requirements. Therefore, the design has a certain degree of flexibility, and the slot parameters can be fine-tuned to adapt to different devices and frequency band requirements, further improving the diversity of application scenarios.

[0057] Reliability of test verification. The test was verified by a high-precision network analyzer, using the S21 parameter (isolation) as the core indicator. The data covers the comparative analysis before and after isolation optimization, and the test environment meets international RF performance standards. The isolation performance of the optimized antenna system has been verified many times, and the test data shows that the combination design of isolation metal and slot has shown good stability under various conditions.

[0058] Materials and assembly convenience. The final size of the isolation metal is optimized to 20mm×16mm×0.4mm, and it is integrated with the antenna as an integrated design. The slot design not only meets the DRC rules, but also enhances the RF resonance characteristics. As a result, the amount of material used is reduced, the isolation metal size is smaller, the assembly process is simplified, and the production efficiency is improved, which is suitable for large-scale equipment manufacturing.

[0059] Additionally, Tables 1 and 2 are provided.

[0060] Table 1-Efficiency & Gain

[0061]

[0062] Table 2-VSWR&Isolation

[0063] Number of cycles (GHz) ANT1 VSWR ANT2 VSWR Isolation(dB) 2.40 1.34 1.51 -38.91 2.45 1.54 1.79 -35.55 2.50 1.55 1.71 -35.43 5.15 1.37 1.73 -49.18 5.45 1.23 1.70 -46.10 5.85 2.00 1.72 -43.79

[0064] Table 1 shows Efficiency & Gain (antenna efficiency and gain), and the analysis is as follows.

[0065] Gain: Indicates the signal enhancement capability of the antenna. The larger the value, the farther or stronger the antenna can propagate the signal. According to the data in Table 1, it can be observed that in the 2.4GHz band, the gain is between 1.52dBi and 2.90dBi, indicating that the antenna's signal propagation capability in this band is relatively balanced. In the 5GHz band, the gain is between 4.79dBi (5100MHz) and 5.46dBi (5500MHz), and the gain performance is more prominent, indicating that the signal propagation effect in the 5GHz band is better.

[0066] Efficiency: reflects the loss of the antenna in signal transmission, in dBi or percentage. Negative values ​​represent loss, and the higher the efficiency percentage, the more efficiently the antenna can transmit signals. According to the data in Table 1, it can be observed that in the 2.4GHz band, the antenna efficiency varies from 51.77% to 62.91%, showing that there is a certain fluctuation in transmission efficiency at different frequencies. The efficiency in the 5GHz band is generally higher, up to 68.68% (5900MHz band), which shows that the signal transmission in the 5GHz band is more efficient.

[0067] As for the data trend in Table 1, in the 2.4GHz band, the gain and efficiency are roughly positively correlated. As the frequency increases, the gain gradually increases, but the change in efficiency is relatively gentle, with a small fluctuation range. In the 5GHz band, both the gain and efficiency show better performance. The high efficiency (>50%) in the 5GHz band indicates that the antenna performance in this band has been optimized in the design.

[0068] Table 2 shows VSWR&Isolation (voltage standing wave ratio and isolation), and the analysis is as follows.

[0069] VSWR (Voltage Standing Wave Ratio): An indicator to measure the matching degree of the antenna. The ideal value is 1, indicating that the transmission loss of the antenna is minimal. A larger value indicates a higher transmission loss. In the 2.4GHz band, the VSWR varies from 1.34 to 1.55, all less than 2, indicating that the antenna has a good matching degree in this band and high transmission efficiency. The VSWR in the 5GHz band varies from 1.23 to 2.00. Although 2.00 is close to a higher value, it is still within the allowable range. The antenna is well matched and the transmission performance is guaranteed.

[0070] Isolation: Indicates the degree of signal interference between antennas. The greater the isolation, the less interference. The isolation in the 2.4GHz band is between -35.43dB and -38.91dB, indicating that the interference between antennas is small and the system performance is good. The isolation in the 5GHz band is higher, especially in the 5.15GHz (-49.18dB) and 5.45GHz (-46.10dB) bands, where the isolation performance is very good, effectively reducing mutual interference between signals.

[0071] As for the data trend in Table 2, in the 2.4GHz band, VSWR is maintained near the ideal value, while isolation is relatively stable and close to -35dB, indicating that the antenna design in this band is relatively balanced and interference control is good. In the 5GHz band, VSWR fluctuates slightly, but the overall isolation is excellent, especially in the upper bands of 5GHz (such as 5.15GHz and 5.45GHz), showing good isolation effect, which helps to reduce interference between multiple antennas and improve performance.

[0072] In summary, Table 1 shows that with the change of frequency band, the gain and efficiency performance gradually increase, especially the antenna efficiency of 5GHz band is greatly improved (up to 68.68%), indicating that the antenna design is more superior in signal propagation in 5GHz band; Table 2 shows that the isolation of 5GHz band is generally good, which is consistent with the design concept of optimizing metal slots for different frequency bands. By adjusting the size of the metal slot, a higher isolation is ensured, mutual interference is reduced, and the performance of the system is improved.

[0073] Therefore, the data in Table 1 and Table 2 show that the dual WiFi antenna isolation optimization structure performs well in many aspects. While maintaining high isolation, it ensures the high efficiency of signal transmission and the stability of the system, especially in frequency band selection and antenna efficiency.

[0074] Therefore, in simple terms, the short-range dual WiFi antenna isolation optimization structure is achieved through an integrated isolation metal design, precisely adjusted metal slot layout, and dual-band compatibility support.

[0075] 1. Achieve high isolation of <-35dB in dual frequency bands.

[0076] 2. Improve antenna efficiency (>40%), enhance signal quality and coverage.

[0077] 3. Optimize space utilization and support the needs of miniaturized equipment.

[0078] 4. Provide flexible tuning design to adapt to various device scenarios.

[0079] 5. Simplify the assembly process to ensure operability during mass production.

[0080] This design significantly improves the performance and applicability of the antenna system, which is especially important in wireless devices with space constraints and high performance requirements.

[0081] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A short-range dual WIFI antenna isolation optimization structure, characterized in that: The structure includes dual WiFi antennas, isolation metal, a metal slot and a supporting structure; The two antennas in the dual WiFi antenna are separated by the isolation metal, the isolation metal is placed at the ends of the antennas, and the isolation metal is used to reduce signal interference between the antennas; The metal slot Slot surrounds the dual WiFi antennas and the isolation metal, and the metal slot Slot is used to match the target frequency band of the signal after the circumference of the slot is adjusted; The support structure is in direct contact with the dual WiFi antennas and the isolation metal to provide structural support.

2. The structure according to claim 1, characterized in that: Two of the dual WiFi antennas support working in dual frequency bands of 2.4 GHz and 5 GHz; The voltage standing wave ratio of the dual WiFi antenna is less than 2, and the dual frequency band ranges are 2400-2500MHz and 5100-5900MHz respectively.

3. The structure according to claim 2, characterized in that: The distance between the two antennas in the dual WiFi antenna is 75 mm.

4. The structure according to claim 2, characterized in that: In response to the dual WiFi antenna supporting dual-band operation, at least two metal slots are provided, and each metal slot is optimized for wavelengths of different frequency bands.

5. The structure according to claim 1, characterized in that: The dimensions of the isolation metal are 20 mm long x 16 mm wide x 0.4 mm thick.

6. The structure according to claim 1, characterized in that The support structure is mounted on the mounting plate of the dual WiFi antenna or the internal frame of the device, and is in direct contact with the dual WiFi antenna and the isolation metal.

7. The structure according to claim 2, characterized in that: The metal slot is obtained by drilling a hole or digging a groove in metal.

8. The structure according to claim 4, characterized in that The dual WiFi antennas are connected to a network analyzer, and the isolation measurement between the dual WiFi antennas is achieved through the network analyzer connection.

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