High isolation wifi antenna

Abstract

This application discloses a high-isolation Wi-Fi antenna, including a PCB substrate. The PCB substrate has a first antenna mounting portion and a second antenna mounting portion. An isolation structure is provided between the first antenna mounting portion and the second antenna mounting portion. The isolation structure includes a first trace and multiple pairs of second traces, with the multiple pairs of second traces symmetrically arranged on both sides of the first trace. The first trace includes a first vertical line and a pair of first horizontal lines, with the pair of first horizontal lines symmetrically arranged at the upper and lower ends of the first vertical line. The second trace includes a second vertical line and a pair of second horizontal lines, with the pair of second horizontal lines symmetrically arranged at the upper and lower ends of the second vertical line. This design, by introducing a periodic defect structure, can improve the isolation of the two antennas by 5-10 dB.

Description

Technical Field

[0001] This application relates to the field of antennas, and in particular to a highly isolated Wi-Fi antenna. Background Technology

[0002] With the development of WiFi 7, the number of antennas on WiFi routers is increasing. Ensuring sufficient isolation between multiple antennas within a limited space is essential for guaranteeing the transmission speed of WiFi devices.

[0003] Existing dual-band WiFi antennas are mounted on the same metal base plate, suitable for ceiling-mounted installations. However, due to sharing the same metal base plate and the relatively close spacing between the antennas, the isolation between the two dual-band antennas is not ideal. Utility Model Content

[0004] The purpose of this invention is to provide a Wi-Fi antenna with high isolation to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This application discloses a highly isolated Wi-Fi antenna, characterized in that it includes a PCB base plate, on which a first antenna mounting part and a second antenna mounting part are provided, and an isolation structure is provided between the first antenna mounting part and the second antenna mounting part. The isolation structure includes a first trace and multiple pairs of second traces, and the multiple pairs of second traces are symmetrically arranged on both sides of the first trace. The first trace includes a first vertical line and a pair of first horizontal lines, and the pair of first horizontal lines are symmetrically arranged at the upper and lower ends of the first vertical line. The second trace includes a second vertical line and a pair of second horizontal lines, and the pair of second horizontal lines are symmetrically arranged at the upper and lower ends of the second vertical line.

[0007] Preferably, in the aforementioned high-isolation Wi-Fi antenna, the length of the first vertical line is greater than the length of the second vertical line, and the length of the first horizontal line is greater than the length of the second horizontal line.

[0008] Preferably, in the aforementioned highly isolated Wi-Fi antenna, the second trace is provided in two pairs.

[0009] Preferably, in the above-mentioned high isolation Wi-Fi antenna, the two ends of the first vertical line are fixedly connected to the midpoint of a pair of second horizontal lines, and the two ends of the second vertical line are fixedly connected to the midpoint of a pair of second horizontal lines.

[0010] Preferably, in the aforementioned highly isolated Wi-Fi antenna, both the first trace and the second trace penetrate the surface metal layer of the PCB substrate.

[0011] Compared with the prior art, the advantages of the present utility model are as follows:

[0012] A periodic defected ground structure is added to the metal bottom plate, thereby changing the distributed capacitance and distributed inductance of the metal bottom plate, making the surface current of the ground plate have a bandgap characteristic, and by adjusting the length and width of the defected ground, the frequency range of the bandgap characteristic can be adjusted to be within the required operating frequency band. This design can improve the isolation between two antennas by 5 - 10 dB by introducing a periodic defected ground structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 The following shows a schematic structural diagram of a high-isolation Wi-Fi antenna in a specific embodiment of the present utility model. SPECIFIC EMBODIMENTS

[0015] The following will combine the drawings in the embodiments of the present utility model to describe the technical solutions in the embodiments of the present utility model in detail. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0016] Refer Figure 1 As shown, the high-isolation Wi-Fi antenna in this embodiment includes a PCB bottom plate 1. On the PCB bottom plate 1, there are a first antenna mounting part 2 and a second antenna mounting part 3. Between the first antenna mounting part 2 and the second antenna mounting part 3, there is an isolation structure 4. The isolation structure 4 includes a first trace 5 and multiple pairs of second traces 6. The multiple pairs of second traces 6 are symmetrically arranged on both sides of the first trace 5. The first trace 5 includes a first vertical line 501 and a pair of first horizontal lines 502. The pair of first horizontal lines 502 are symmetrically arranged at the upper and lower ends of the first vertical line 501. The second trace 6 includes a second vertical line 601 and a pair of second horizontal lines 602. The pair of second horizontal lines 602 are symmetrically arranged at the upper and lower ends of the second vertical line 601.

[0017] Furthermore, the length of the first vertical line 501 is greater than the length of the second vertical line 601, and the length of the first horizontal line 502 is greater than the length of the second horizontal line 602.

[0018] Furthermore, there are two pairs of the second traces 6.

[0019] Furthermore, the two ends of the first vertical line 501 are fixedly connected to the midpoints of a pair of second horizontal lines 502, and the two ends of the second vertical line 601 are fixedly connected to the midpoints of a pair of second horizontal lines 602.

[0020] Furthermore, both the first trace 5 and the second trace 6 penetrate the surface metal layer of the PCB base plate 1.

[0021] In this technical solution, a periodic defect ground structure is added to the metal base plate, thereby altering the distributed capacitance and inductance of the metal base plate. This causes the surface current of the ground plate to exhibit bandgap characteristics. Furthermore, by adjusting the length and width of the defect ground, the frequency range of the bandgap characteristics can be adjusted to fall within the desired operating frequency band. This design, by introducing a periodic defect ground structure, can improve the isolation of the two antennas by 5-10 dB.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0023] The above are merely specific embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A Wi-Fi antenna with high isolation, characterized in that: The device includes a PCB base plate, on which a first antenna mounting part and a second antenna mounting part are provided. An isolation structure is provided between the first antenna mounting part and the second antenna mounting part. The isolation structure includes a first trace and multiple pairs of second traces. The multiple pairs of second traces are symmetrically arranged on both sides of the first trace. The first trace includes a first vertical line and a pair of first horizontal lines. The pair of first horizontal lines are symmetrically arranged at the upper and lower ends of the first vertical line. The second trace includes a second vertical line and a pair of second horizontal lines. The pair of second horizontal lines are symmetrically arranged at the upper and lower ends of the second vertical line.

2. The Wi-Fi antenna with high isolation according to claim 1, characterized in that: The length of the first vertical line is greater than the length of the second vertical line, and the length of the first horizontal line is greater than the length of the second horizontal line.

3. The Wi-Fi antenna with high isolation according to claim 1, characterized in that: The second routing has two pairs.

4. A high-isolation Wi-Fi antenna according to claim 1, characterized in that: The two ends of the first vertical line are fixedly connected to the midpoints of a pair of second horizontal lines, and the two ends of the second vertical line are fixedly connected to the midpoints of a pair of second horizontal lines.

5. A high-isolation Wi-Fi antenna according to claim 1, characterized in that: Both the first and second traces penetrate the surface metal layer of the PCB substrate.

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