A single-polarization low-roundness indoor distributed antenna

Abstract

A single-polarization low-out-of-roundness indoor distributed antenna comprises a top radiating unit, a vertically polarized radiating unit and a ground plate; the vertically polarized radiating unit comprises a plurality of radiating patches distributed in a circular array with the center of the ground plate as the center, and each radiating patch is arranged to extend in the vertical direction; at least one notch is provided on the outer side of each radiating patch; the top radiating unit comprises a first circular patch and a second circular patch arranged up and down; the out-of-roundness of the antenna is improved while maintaining the high-gain radiation characteristics of the antenna through the six radiating patches distributed in a circular array, and the frequency resonance point of the antenna is increased and the bandwidth is expanded by providing two notches on the radiating patch; the out-of-roundness of the vertically polarized radiation is improved by providing the first circular patch and the second circular patch with a spacing; the impedance matching of the antenna is improved and the good omnidirectional radiation characteristics of the antenna are maintained through the arc-shaped hole of the ground plate.

Description

Technical Field

[0001] The invention relates to the technical field of antennas, and in particular to a single-polarization low-out-of-roundness indoor distributed antenna. Background Art

[0002] Indoor communication is the main scenario of daily life communication. Indoor distributed antenna systems can provide signal sources and destinations for indoor communication to transmit signals. Therefore, the development of indoor distributed antennas that cover 2G / 3G / LTE / 5G frequency bands has broad application prospects. Generally, each destination in indoor scenarios requires good signal reception, which requires indoor distributed antennas to have good omnidirectional radiation characteristics and good non-circularity in the XOY plane. At present, when designing single-polarized indoor distributed antennas, conical structures are often used to achieve vertical polarization. However, the existing single-cone structure is difficult to achieve a wide bandwidth of 136.4% (0.70GHz-3.7GHz) covering the 2G / 3G / LTE / 5G frequency bands, and it is difficult to maintain good omnidirectional radiation characteristics of the antenna while achieving wide bandwidth of the antenna. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a single-polarization low-out-of-roundness indoor distributed antenna.

[0004] To achieve the above-mentioned purpose, the solution provided by the present invention is a single-polarization low-out-of-roundness indoor distributed antenna, including a top radiating unit, a vertically polarized radiating unit and a grounding plate; the vertically polarized radiating unit includes a plurality of radiating patches distributed in a circular array with the center of the grounding plate as the center, and each of the radiating patches is extended and arranged in a vertical direction; at least one notch is opened on the outer side of each of the radiating patches; the top radiating unit includes a first circular patch and a second circular patch arranged in an upper and lower manner, wherein a spacing is provided between the first circular patch and the second circular patch; the second circular patch is fixedly connected to the tops of the plurality of radiating patches; and the bottoms of the plurality of radiating patches are fixedly connected to the grounding plate.

[0005] Furthermore, the first circular patch and the second circular patch are fixedly connected via an insulating bracket.

[0006] Furthermore, each of the radiation patches includes a first radiation portion and a second radiation portion which are integrally formed and arranged vertically, wherein the top of the first radiation portion is fixedly connected to the second circular patch, the bottom of the second radiation portion is fixedly connected to the ground plate, and at least one notch is opened on the outer side of the first radiation portion.

[0007] Furthermore, the first radiating portion and the second radiating portion are both polygonal.

[0008] Furthermore, a plurality of the second radiating parts are fixedly connected to each other.

[0009] Furthermore, the inner side of each of the first radiating portions is extended along the vertical direction.

[0010] Furthermore, a plurality of the first radiation portions are not connected to each other.

[0011] Furthermore, the grounding plate is circular.

[0012] Furthermore, the grounding plate is preset with a plurality of arc-shaped holes distributed in a circular array with the center of the grounding plate as the center.

[0013] Furthermore, the plurality of arc-shaped holes are not connected to each other.

[0014] The beneficial effects of the present invention are as follows: by means of six radiating patches distributed in a circular array, the out-of-roundness of the antenna is improved while maintaining the high-gain radiation characteristics of the antenna, and by means of two notches in the radiating patch, the frequency resonance point of the antenna is increased and the bandwidth is expanded; the out-of-roundness of the vertically polarized radiation is improved by means of the first circular patch and the second circular patch with a spacing; the impedance matching of the antenna is improved by means of the arc-shaped hole in the ground plate and the good omnidirectional radiation characteristics of the antenna are maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the antenna.

[0016] Figure 2 Schematic diagram of the radiation patch.

[0017] Figure 3 Schematic diagram of the ground plane.

[0018] Figure 4 This is the S-parameter diagram of the antenna simulation.

[0019] Figure 5 is the gain diagram of the antenna.

[0020] Figure 6 This is the out-of-roundness diagram of the antenna.

[0021] Figure 7 is the antenna's directional pattern.

[0022] Among them, 1-top radiation unit, 11-first circular patch, 12-second circular patch, 2-radiation patch, 21-first radiation part, 22-second radiation part, 23-notch, 3-ground plate, 31-arc hole, 32-through hole. DETAILED DESCRIPTION

[0023] 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.

[0024] Reference Figures 1 to 3 In this embodiment, a single-polarization low-out-of-round indoor distributed antenna includes a top radiating unit 1, a vertically-centered aligned vertical polarization radiating unit, and a circular grounding plate 3, wherein a through hole 32 for feeding is preset at the center of the grounding plate 3, and the feeding wire feeds the vertically-polarized radiating unit and the grounding plate 3 respectively through the through hole 32. The grounding plate 3 is preset with four arc-shaped holes 31, wherein the four arc-shaped holes 31 are distributed in a circular array with the center of the grounding plate as the center of the circle, and specifically, the four arc-shaped holes 31 are arranged with 45°, 135°, 225° and 315° as the center, respectively. When the antenna is in use, the current of the grounding plate 3 can be guided through the four arc-shaped holes 31, thereby improving the impedance matching of the vertical polarization and reducing the out-of-roundness of the antenna.

[0025] In this embodiment, the vertical polarization radiation unit includes six radiation patches 2 distributed in a circular array with the center of the ground plate 3 as the center, wherein the six radiation patches 2 are arranged on the sections at 0°, 60°, 120°, 180°, 240° and 300°, respectively. When the antenna is in use, the antenna maintains a wide bandwidth and good omnidirectional characteristics. Each radiation patch 2 is composed of a first radiation portion 21 and a second radiation portion 22 that are integrally formed and arranged up and down, wherein the six second radiation portions 22 are fixedly connected to each other, and the bottoms of the six second radiation portions 22 are fixedly connected to the center of the ground plate 3, and at the same time, the bottoms of the six second radiation portions 22 are connected to the feeding wire. The six first radiation portions 21 are not connected to each other. The inner side of each first radiation portion 21 is a straight edge extending in the vertical direction; the outer side of each first radiation portion 21 is provided with two notches 23. When the antenna is in use, the two notches 23 effectively guide the current on the radiation patch 2, increase the frequency resonance point, and improve the impedance matching of the vertical polarization. In this embodiment, the first radiating portion 21 and the second radiating portion 22 are both polygonal. Specifically, the first radiating portion 21 is a quadrilateral, and the second radiating portion 22 is a right triangle. Therefore, the radiating patch 2 has a polygonal sheet structure. The polygonal radiating patch 2 can effectively extend the electrical length and expand the low-frequency bandwidth of the vertically polarized antenna.

[0026] In this embodiment, the top radiation unit 1 includes a first circular patch 11 and a second circular patch 12 arranged in an upper and lower manner, wherein the first circular patch 11 and the second circular patch 12 are fixedly connected by an insulating bracket, so that a spacing is provided between the first circular patch 11 and the second circular patch 12, wherein the material of the insulating bracket is plastic. The top radiation unit 1 and the vertical polarization radiation unit are combined to form a vertically polarized radiation structure, wherein the top of the first radiation portion 21 of each radiation patch 2 is fixedly connected to the second circular patch 12, and when the antenna is in use, the second circular patch 12 improves the non-circularity of the vertical polarization, and the first circular patch 11 that maintains a certain spacing with the second circular patch 12 further improves the non-circularity of the vertical polarization, thereby optimizing the omnidirectional radiation characteristics of the antenna.

[0027] Reference Figure 4 , the figure is an S parameter diagram of the antenna simulation. It can be seen from the figure that in this embodiment, the impedance bandwidth of the antenna is 144.3% (0.66GHz-4.08GHz), and the antenna maintains a relatively wide bandwidth.

[0028] Reference Figure 5 , which is a gain diagram of the antenna. It can be seen from the figure that in this embodiment, the gain of the vertical polarization of the antenna varies in the range of 0.86dBi-8.00dBi within the effective frequency band.

[0029] Reference Figure 6 , the figure is a diagram of the out-of-roundness of the antenna. It can be seen from the figure that in this embodiment, the out-of-roundness of the antenna is greater than -2dBi, which meets the industrial design requirements.

[0030] Reference Figure 7 , the figure is the directional diagram of the antenna. It can be seen from the figure that in this embodiment, the XOY plane of the antenna has a good omnidirectional characteristic, and its cross polarization is less than -16dB.

[0031] 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 single-polarization low-out-of-roundness indoor distributed antenna, comprising a top radiating unit (1), a vertically polarized radiating unit and a ground plate (3), Features: The vertically polarized radiation unit comprises a plurality of radiation patches (2) distributed in a circular array with the center of the ground plate (3) as the center of the circle, and can guide the current on the cut plane at fixed directions of 0°, 60°, 120°, 180°, 240°, and 300°, thereby reducing the non-circularity while maintaining the high-gain radiation characteristics, and improving the omnidirectional radiation characteristics, and each of the radiation patches (2) is arranged to extend in the vertical direction; at least one notch (23) is opened on the outer side of each of the radiation patches (2), and the surface current of the radiation patch (2) is guided through the notch (23) to increase the frequency resonance point and widen the bandwidth of the antenna; the top radiation unit (1) comprises a first circular patch (11) and a second circular patch (12) arranged in an upper and lower manner, and the upper first circular patch (11) is used to reduce the non-circularity. ， in, A spacing is provided between the first circular patch (11) and the second circular patch (12), and the first circular patch (11) and the second circular patch (12) provided with the spacing are used to improve the non-circularity of vertical polarization radiation and optimize the omnidirectional radiation characteristics of the antenna; the second circular patch (12) is fixedly connected to the tops of a plurality of the radiation patches (2); the bottoms of a plurality of the radiation patches (2) are fixedly connected to the ground plate (3), wherein the ground plate (3) is circular, and a plurality of circular arc holes (31) which are not connected to each other and are distributed in a circular array are etched on the ground plate (3) with the center of the ground plate (3) as the center of the circle, and are arranged with 45°, 135°, 225° and 315° as the center, respectively; through the four circular arc holes (31), the current of the ground plate (3) can be guided, the impedance matching of the vertical polarization is improved, the good omnidirectional radiation characteristics of the antenna are maintained, and the non-circularity of the antenna is reduced.

2. A single-polarization low-out-of-roundness indoor distributed antenna according to claim 1, Features: The first circular patch (11) and the second circular patch (12) are fixedly connected via an insulating bracket, and the second circular patch (12) is fixed directly above the first circular patch (11) via the insulating bracket, so that the out-of-roundness of vertical polarization can be further improved, and the omnidirectional radiation characteristics of the antenna can be optimized. Furthermore, the use of the insulating bracket can effectively prevent a short circuit from occurring between the second circular patch (12) and the first circular patch (11).

3. A single-polarization low-out-of-roundness indoor distributed antenna according to claim 1, Features: Each of the radiation patches (2) comprises a first radiation portion (21) and a second radiation portion (22) which are integrally formed and arranged in an upper and lower manner, the first radiation portion (21) being in the form of a quadrilateral and the second radiation portion (22) being in the form of a right triangle, so that the radiation patch (2) has a polygonal sheet structure, which can effectively extend the electrical length, generate multiple resonance modes, and expand the low-frequency bandwidth of the vertically polarized antenna, wherein the top of the first radiation portion (21) is fixedly connected to the second circular patch (12), and the non-circularity of the vertical polarization is improved by the second circular patch (12), and the second radiation portion (22) constitutes the lower half of the radiation patch (2), and they are fixedly connected to each other, and the bottom thereof is connected to the grounding The plate (3) is fixedly connected, and a through hole for feeding is preset at the center position of the ground plate (3) so that the bottom of the second radiating portion (22) is connected to the feeding wire, thereby feeding the vertically polarized radiating unit. Compared with a conventional antenna that does not adopt this grounding connection method, by adjusting the coupling degree between the radiating patch (2) and the ground plate (3), additional resonance modes can be excited, the working frequency band of the antenna is widened, and it is helpful to control the electric field distribution of the antenna and achieve low non-circularity performance; and two notches (23) are opened on the outer side of the first radiating portion (21), and the current on the radiating patch (2) is effectively guided through the two notches (23), the frequency resonance point is increased, and the impedance matching of the vertical polarization is improved.

4. A single-polarization low-out-of-roundness indoor distributed antenna according to claim 3, Features: A plurality of the second radiating parts (22) are fixedly connected to each other.

5. The single-polarization low-out-of-roundness indoor distributed antenna according to claim 3, Features: The inner side of each of the first radiating portions (21) is arranged to extend in the vertical direction. Compared with the traditional patch layout, the antenna adopts an inner side extending in the vertical direction, which can change the current distribution path, effectively broaden the working frequency band of the antenna, and increase the effective radiation area without significantly increasing the overall size of the antenna. This extension method can achieve better radiation performance in a limited space, and at the same time can interact with the feed network and the ground plate (3), making it easier to achieve good impedance matching.

6. A single-polarization low-out-of-roundness indoor distributed antenna according to claim 3, Features: The plurality of first radiating parts (21) are not connected to each other, so that each radiating patch can work independently. This design can reduce the interference caused by coupling between adjacent radiating patches, especially in a complex indoor electromagnetic environment, thereby making the performance more stable. In addition, the design uses six polygonal radiating patches (2), so that each patch can independently control its radiation direction, and guide the current transmitted from the coaxial line to the section at 0°, 60°, 120°, 180°, 240°, and 300°. While maintaining the high-gain radiation characteristics, it also reduces the non-circularity and improves the omnidirectional radiation characteristics.

7. The single-polarization low-out-of-roundness indoor distributed antenna according to claim 3, Features: The first radiating portion (21) and the second radiating portion (22) are both polygonal.

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