A broadband high-gain WiFi omnidirectional antenna

Abstract

The present invention discloses a broadband high-gain WiFi omnidirectional antenna, comprising a dielectric substrate, wherein a feeding point is provided on the upper surface of the dielectric substrate, and a sawtooth radiation component and a wave radiation component are arranged on the left and right sides of the feeding point, wherein the wave radiation component comprises a strip radiation patch and a rectangular radiation patch, wherein the rectangular radiation patch is connected to one end of the strip radiation patch; the strip radiation patch is formed with a wave radiation section in a planar wave structure; and two groups of first bent radiation patches and two groups of second bent radiation patches are provided on the lower surface of the dielectric substrate, wherein the sawtooth radiation component is respectively connected to the two groups of first bent radiation patches through two first metal through holes preset in the dielectric substrate, and the wave radiation component is simultaneously connected to the two groups of second bent radiation patches through a first metal through hole preset in the dielectric substrate.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna structures, and in particular to a broadband high-gain WiFi omnidirectional antenna. Background Art

[0002] With the development of wireless communication systems, various mobile terminal devices are becoming more and more popular, among which WiFi communication plays an indispensable role in wireless communication systems. The performance of WiFi antennas directly determines the quality of WiFi communication systems. The increase in terminal devices leads to an increase in the amount of information required to be transmitted, so broadband WiFi antennas are needed to meet the demand. At the same time, as the application scenarios of WiFi antennas tend to be more complicated, high-gain and low-out-of-round WiFi antennas are needed to extend the transmission distance and increase the coverage range.

[0003] Secondly, existing WiFi antennas only consider bandwidth requirements without considering the depth of resonance. Deeper resonance means better impedance matching, which helps reduce the energy loss of the antenna itself and radiates energy into space better. At the same time, the gain of WiFi antennas is generally low, which is not conducive to coping with increasingly complex application environments. Therefore, it is necessary to design a WiFi antenna that meets broadband, deep resonance, high gain and low non-circularity. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a broadband high-gain WiFi omnidirectional antenna that can cover the 2.4-2.5GHz frequency band. The antenna also has the characteristics of wide bandwidth, deep resonance, high gain, low non-circularity, and low cost.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a broadband high-gain WiFi omnidirectional antenna, including a dielectric substrate, the upper surface of the dielectric substrate is provided with a feeding point, and a sawtooth radiation component and a wave radiation component arranged on the left and right sides of the feeding point, the wave radiation component includes a strip radiation patch and a rectangular radiation patch, wherein the rectangular radiation patch is connected to one end of the strip radiation patch; the strip radiation patch is formed with a wave radiation section with a planar wave structure; the lower surface of the dielectric substrate is provided with two groups of first bent radiation patches and two groups of second bent radiation patches, wherein the sawtooth radiation component is respectively connected to the two groups of first bent radiation patches through two first metal through holes preset in the dielectric substrate, and the wave radiation component is simultaneously connected to the two groups of second bent radiation patches through a first metal through hole preset in the dielectric substrate.

[0006] Furthermore, the two groups of the first bent radiating patches and the two groups of the second bent radiating patches are symmetrically arranged on both sides of the center line direction of the dielectric substrate.

[0007] Furthermore, the first curved radiation patch and the second curved radiation patch both have an "L"-shaped structure.

[0008] Furthermore, the rectangular radiation patch includes a first rectangular radiation portion extending along the centerline direction of the dielectric substrate, and two groups of second rectangular radiation portions symmetrically arranged on both sides of the centerline direction of the dielectric substrate, and both of the second rectangular radiation portions are connected to one end of the first rectangular radiation portion; the other end of the first rectangular radiation portion is connected to one end of the strip radiation patch.

[0009] Furthermore, the sawtooth radiation component includes two groups of sawtooth radiation patches symmetrically arranged on both sides of the center line direction of the dielectric substrate.

[0010] Furthermore, each of the first bent radiation patch and the second bent radiation patch on the lower surface of the dielectric substrate does not overlap with the strip radiation patch and the rectangular radiation patch on the upper surface of the dielectric substrate in the vertical direction.

[0011] The present invention adopts the above scheme, and its beneficial effects are: 1) by arranging a sawtooth radiation component on the upper surface of the dielectric substrate, the impedance matching performance is improved; 2) by arranging a first bent radiation patch and a second bent radiation patch on the lower surface of the dielectric substrate, a bending process is performed to ensure that energy can be effectively radiated into space, while reducing the length of the antenna to achieve the purpose of miniaturization; 3) by adopting a wave radiation section with a planar wave structure, the gain can be improved while achieving the effect of miniaturization; 4) the first metal through hole and the second metal through hole are used to connect the radiation patches on the upper surface and the lower surface of the dielectric substrate, so as to expand the bandwidth and deepen the effect of the resonance point. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the overall structure of the antenna of the embodiment.

[0013] Figure 2 Schematic diagram of the structure of the upper surface of the antenna of the embodiment.

[0014] Figure 3 Schematic diagram of the structure of the lower surface of the antenna of the embodiment.

[0015] Figure 4 Schematic diagram of the overall structure of the antenna for reference example.

[0016] Figure 5 Graph showing the reflection coefficient of the embodiment.

[0017] Figure 6 FIG. 4 is a schematic diagram of a peak gain curve of an embodiment.

[0018] Figure 7 FIG. 4 is a schematic diagram of a radiation efficiency curve of an embodiment.

[0019] Figure 8 : is the radiation pattern of the antenna of the embodiment at a frequency of 2.4 GHz.

[0020] Among them, 1-dielectric substrate, 2-feeding point, 3-sawtooth radiation component, 31-sawtooth radiation patch, 4-wave radiation component, 41-rectangular radiation patch, 411-first rectangular radiation part, 412-second rectangular radiation part, 42-strip radiation patch, 421-wave radiation section, 422-strip radiation section, 5-first bent radiation patch, 6-second bent radiation patch. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0022] See attached Figures 1 to 3 As shown in FIG. 1 , a broadband high-gain WiFi omnidirectional antenna includes a dielectric substrate 1, wherein the dielectric substrate 1 is a FR4 substrate with a thickness of 1 mm and a dielectric constant of 4.4. Figure 1 and 2 Two surfaces arranged up and down in the dielectric substrate 11 shown are defined as an upper surface and a lower surface, respectively.

[0023] See attached Figure 2 As shown, in this embodiment, a feeding point 2 is provided on the upper surface of the dielectric substrate 1, and a sawtooth radiation component 3 and a wave radiation component 4 are arranged on the left and right sides of the feeding point 2. The sawtooth radiation component 3 includes two groups of sawtooth radiation patches 31 symmetrically arranged on both sides of the midline direction of the dielectric substrate 1, and the inner edge of the sawtooth radiation patch 31 is sawtooth-shaped, thereby improving the impedance matching performance. Secondly, one end of the two sawtooth radiation patches 31 is connected to the feeding point 2. The wave radiation component 4 includes a strip radiation patch 42 and a rectangular radiation patch 41, wherein the strip radiation patch 42 is formed with a wave radiation segment 421 with a planar wave structure. Specifically, the strip radiation patch 42 is divided into a strip radiation segment 422 extending along the centerline direction of the dielectric substrate 1 and having a long strip structure and a wave radiation segment 421 with a planar wave structure according to the shape characteristics, and the two ends of the wave radiation segment 421 are correspondingly connected with the strip radiation segment 422; the wave radiation segment 421 is planarized in accordance with the three-dimensional spiral structure so that the wave radiation segment 421 has a planar wave structure, which effectively extends the electrical length of the strip radiation patch 42 and shortens the overall structural length of the antenna, thereby achieving miniaturization and high gain effects.

[0024] Further, the rectangular radiation patch 41 includes a first rectangular radiation portion 411 extending along the centerline direction of the dielectric substrate 1, and two groups of second rectangular radiation portions 412 symmetrically arranged on both sides of the centerline direction of the dielectric substrate 1, and the two second rectangular radiation portions 412 are connected to one end of the first rectangular radiation portion 411. Secondly, the other end of the first rectangular radiation portion 411 is connected to one end of the strip radiation section 422 of the strip radiation patch 42, thereby realizing that one end of the rectangular radiation patch 41 is connected to one end of the strip radiation patch 42, and achieving high gain performance.

[0025] Further, the other end of the rectangular radiation patch 41 is connected to the feeding point 2 .

[0026] See attached Figure 3 As shown, in this embodiment, two groups of first bent radiation patches 5 and two groups of second bent radiation patches 6 are provided on the lower surface of the dielectric substrate 1, wherein the first bent radiation patches 5 and the second bent radiation patches 6 are both in an "L"-shaped structure. Secondly, the sawtooth radiation component 3 is connected to the two groups of first bent radiation patches 5 respectively through two first metal through holes preset in the dielectric substrate 1, that is, the two sawtooth radiation patches 31 of the sawtooth radiation component 3 are connected to the two groups of first bent radiation patches 5 respectively through the two first metal through holes. The wave radiation component 4 is simultaneously connected to the two groups of second bent radiation patches 6 through a first metal through hole preset in the dielectric substrate 1, that is, the two groups of second bent radiation patches 6 extend and converge to the second metal through hole, and the strip radiation section 422 of the wave radiation component 4 is simultaneously connected to the two groups of second bent radiation patches 6 through the second metal through hole. The first metal through hole and the second metal through hole are used to connect the radiation patch on the lower surface of the dielectric substrate 1 with the radiation patch on the upper surface, thereby improving the impedance matching performance of the antenna and enabling the antenna to achieve a wider bandwidth and a deeper resonance point.

[0027] Furthermore, the first bent radiation patch 5 and the second bent radiation patch 6 of the "L"-shaped structure can avoid the situation where the radiation patches on the lower surface of the dielectric substrate 1 are parallel to the radiation patches on the upper surface, and can avoid the problem of energy being blocked from radiating into space due to parallelism. It can also effectively expand the radiation patch area of ​​the antenna without increasing the overall size of the antenna, achieve miniaturization and improve the antenna gain performance.

[0028] In this embodiment, the first bent radiation patches 5 and the second bent radiation patches 6 on the lower surface of the dielectric substrate 1 do not overlap with the strip radiation patches 42 and the rectangular radiation patches 41 on the upper surface in the vertical direction, thereby improving gain performance.

[0029] In order to facilitate the understanding of the antenna performance of the above embodiment, the following is a Figure 4 The antenna shown is explained as a reference example.

[0030] like Figure 4 Compared with the antenna structure of the above embodiment, the antenna structure shown in the figure is characterized in that the lower surface of the dielectric substrate 1 is not provided with the first bent radiation patch 5 and the second bent radiation patch 6, and the dielectric substrate 1 is not provided with a metal through hole. By comparing the reflection coefficient performance of the antenna of the reference example with the antenna of the present embodiment, it is obtained Figure 5 As shown in the reflection coefficient curve graph, antenna 1 is the antenna reflection coefficient curve of the present embodiment, and antenna 2 is the antenna reflection coefficient curve of the reference example. It can be seen that by providing the first bent radiation patch 5 and the second bent radiation patch 6, as well as the metal through hole, the effects of extending the bandwidth and deepening the resonance point can be achieved, and the antenna reflection coefficient of the antenna of the present embodiment in the 2.4-2.5GHz frequency band is less than -10dB, and the deepest resonance point is close to -25 dB.

[0031] See attached Figure 6 It can be seen from the peak gain curve that the antenna of this embodiment has a gain greater than 3.8 dBi in the working frequency band.

[0032] See attached Figure 7 It can be seen from the radiation efficiency curve that the radiation efficiency of the antenna of this embodiment is greater than 90% in the working frequency band.

[0033] See attached Figure 8 It can be seen from the radiation pattern shown that the antenna of this embodiment exhibits good omnidirectional radiation performance at a frequency of 2.45 GHz, with a non-circularity of less than 1 dBi and a cross-polarization of less than -27 dB.

[0034] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the technical solution of the present invention, makes more possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or modifications are all equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A broadband high-gain WiFi omnidirectional antenna, comprising a dielectric substrate (1), characterized in that: The upper surface of the dielectric substrate (1) is provided with a feeding point (2), and a sawtooth radiation component (3) and a wave radiation component (4) arranged on the left and right sides of the feeding point (2); the wave radiation component (4) comprises a strip radiation patch (42) and a rectangular radiation patch (41), wherein the rectangular radiation patch (41) is connected to one end of the strip radiation patch (42); the strip radiation patch (42) is formed with a wave radiation section (421) in a planar wave structure; the lower surface of the dielectric substrate (1) is provided with two groups of first bent radiation patches (5) and two groups of second bent radiation patches (6), wherein the sawtooth radiation component (3) is respectively connected to the two groups of first bent radiation patches (5) through two first metal through holes preset in the dielectric substrate (1). The wave radiation component (4) is connected to a first rectangular radiation patch (5), and the wave radiation component (4) is simultaneously connected to two groups of second bent radiation patches (6) through a first metal through hole preset in the dielectric substrate (1); the first bent radiation patch (5) and the second bent radiation patch (6) are both in an "L"-shaped structure; the rectangular radiation patch (41) comprises a first rectangular radiation portion (411) extending along the centerline direction of the dielectric substrate (1), and two groups of second rectangular radiation portions (412) symmetrically arranged on both sides of the centerline direction of the dielectric substrate (1), and the two second rectangular radiation portions (412) are both connected to one end of the first rectangular radiation portion (411); and the other end of the first rectangular radiation portion (411) is connected to one end of the strip radiation patch (42).

2. The broadband high-gain WiFi omnidirectional antenna according to claim 1, characterized in that: The two groups of the first bent radiation patches (5) and the two groups of the second bent radiation patches (6) are symmetrically arranged on both sides of the midline direction of the dielectric substrate (1).

3. The broadband high-gain WiFi omnidirectional antenna according to claim 1, characterized in that: The sawtooth radiation component (3) comprises two groups of sawtooth radiation patches (31) symmetrically arranged on both sides of the midline direction of the dielectric substrate (1).

4. The broadband high-gain WiFi omnidirectional antenna according to claim 1, characterized in that: The first bent radiation patches (5) and the second bent radiation patches (6) on the lower surface of the dielectric substrate (1) do not overlap with the strip radiation patches (42) and the rectangular radiation patches (41) on the upper surface of the dielectric substrate (1) in the vertical direction.

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