Low-profile horizontal polarization omnidirectional antenna

Abstract

The utility model relates to a low-profile horizontal polarization omnidirectional antenna, which comprises a double-sided PCB (printed circuit board) antenna radiator, a plurality of antenna radiators are arranged on the front surface of the double-sided PCB antenna radiator, and gaps between adjacent antenna radiators form a planar Vivaldi antenna pattern shape. The antenna radiators are connected together at the middle position of the double-sided PCB antenna radiator through a middle connecting part to form a petal-shaped metal radiation whole body, and the middle connecting part is conducted and connected with a core wire of the coaxial transmission line for feeding. According to the antenna, the Vivaldi principle is adopted, the four Vivaldi antennas rotate by 90 degrees to be combined, the power divider principle is utilized to divide feed into four branches, the four branches feed the four Vivaldi antennas respectively, and through microstrip impedance matching of the feed branches, the antenna has the advantages of ultra-bandwidth effect, small size and low profile, and meanwhile, the horizontal polarization characteristic is kept.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency and wireless communication technology, specifically to the antenna application of WiFi 6E products in micro base stations. Background Technology

[0002] With the rapid development of wireless communication technology, people's demand for high-speed, stable, and widely covered wireless networks is increasing. As a new generation of wireless network standard, WiFi 6E can provide greater bandwidth and lower interference, bringing users a better network experience, and has been widely used in many fields.

[0003] In practical applications, such as shopping malls, classrooms, and factories—areas with high foot traffic—the deployment of micro base stations becomes crucial to meet the demand for high-speed network access for a large number of users simultaneously. Micro base stations rely on high-performance antennas to achieve effective signal coverage and transmission.

[0004] Therefore, this utility model provides a low-profile horizontally polarized omnidirectional antenna, which optimizes and innovates the antenna structure to give it characteristics such as low profile, horizontal polarization, and omnidirectionality. At the same time, it ensures good performance under the premise of small size, improves antenna gain, and can cross polarization with vertically polarized antennas to realize a compact layout of multiple antenna combinations, which meets the needs of modern wireless communication development. Utility Model Content

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide a low-profile horizontally polarized omnidirectional antenna.

[0006] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0007] A low-profile horizontally polarized omnidirectional antenna includes a double-sided PCB antenna radiator. The front side of the double-sided PCB antenna radiator is provided with several lobe antenna radiators, and the gap between each adjacent antenna radiator forms a planar Vivaldi antenna pattern. Each antenna radiator is connected together at the middle position of the double-sided PCB antenna radiator through a middle connecting part to form a petal-shaped metal radiating whole. The middle connecting part is connected to the core wire of the coaxial transmission line for power feeding.

[0008] Furthermore, a circular ring is provided at the middle position of the back side of the double-sided PCB antenna radiator, and the circular ring is connected to the outer braid of the coaxial transmission line.

[0009] Furthermore, the back of the dual-sided PCB antenna radiator is provided with a microstrip feed network connecting the circular ring.

[0010] Furthermore, the microstrip power supply network is composed of several microstrip line groups of the same size and shape. Each microstrip line group includes a first microstrip line, a second microstrip line, and a third microstrip line connected in sequence. The outer diameter of the annular portion is tangentially connected to the first microstrip line.

[0011] Furthermore, the first, second, and third microstrip lines have different widths, and bandwidth matching is achieved through a three-segment structure.

[0012] Furthermore, the first microstrip line is horizontally connected to the second microstrip line, and the second microstrip line is vertically connected to the third microstrip line.

[0013] Furthermore, the antenna radiator has a slot in the middle, which increases the current path and squeezes it to the edge, thereby increasing the current density of the Vivaldi antenna and improving the antenna gain.

[0014] Furthermore, the double-sided PCB antenna radiator is provided with a non-conductive first through hole and a second through hole. The double-sided PCB antenna radiator is supported and connected to the PCB base plate through the first through hole and the second through hole, as well as the corresponding plastic bolts, plastic studs and plastic nuts.

[0015] Furthermore, the PCB substrate is covered with copper foil, which causes the energy radiated by the antenna on the double-sided PCB antenna radiator to be reflected when it comes into contact with the PCB substrate, so that the radiated energy of the antenna is mainly concentrated in its upper half space.

[0016] Furthermore, the first through hole and the second through hole are located within the slot.

[0017] The beneficial effects of this utility model are:

[0018] This utility model antenna adopts the Vivaldi principle, combining four Vivaldi antennas rotated 90°. The power divider principle is used to divide the feed into four branches, which feed the four Vivaldi antennas respectively. Through the microstrip impedance matching of the feed branches, the antenna has an ultra-wide bandwidth effect. The antenna has the advantages of small size and low profile, while maintaining horizontal polarization characteristics.

[0019] When micro base stations are deployed in densely populated areas such as shopping malls, classrooms, and factories, the omnidirectional antenna design of this invention can meet the needs of covering a wider range of users. Furthermore, WiFi 6E provides greater bandwidth and less interference. Through the combination principle of Vivaldi antennas, omnidirectionality can be guaranteed while also increasing antenna gain. The beamwidth of a single Vivaldi antenna can reach 120°, and four antennas combined can perfectly cover 360°, meeting the omnidirectional requirement. Vertically polarized antennas can also be placed in the micro base station, which significantly improves the isolation between antennas, enabling a compact layout of multiple antenna combinations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front structure of the double-sided PCB antenna radiator of this utility model;

[0021] Figure 2 This is a schematic diagram of the back structure of the double-sided PCB antenna radiator of this utility model.

[0022] Figure 3 This is a schematic diagram of the PCB base plate structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the plastic bolt, plastic nut, and plastic stud of this utility model;

[0024] Figure 5 This is a schematic diagram of the overall assembly of the antenna of this utility model. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figure 1As shown, a low-profile horizontally polarized omnidirectional antenna includes a double-sided PCB antenna radiator A. The substrate of the double-sided PCB antenna radiator A is made of high-frequency board material, which has the characteristics of low loss and stability. The substrate is generally square in shape and its position is tilted at a 30° angle to the horizontal. The front side of the double-sided PCB antenna radiator A has several lobe antenna radiators A1. In this embodiment, four lobe antenna radiators A1 are evenly distributed, namely the first antenna radiator A11, the second antenna radiator A12, the third antenna radiator A13, and the fourth antenna radiator A14. The material is copper foil, which is glued and pressed onto the substrate. The circuitry on it is exposed using an exposure method. The antenna radiators A1 are obtained through etching and the gaps between adjacent antenna radiators A1 form a planar Vivaldi antenna pattern. Each antenna radiator A1 is connected together at the middle position of the double-sided PCB antenna radiator A by a middle connecting part A21 to form a petal-shaped metal radiating whole. The middle connecting part A21 conducts power to the core wire of the coaxial transmission line. In this embodiment, a through hole A22 is provided in the center of the middle connecting part A21. The hole penetrates the substrate and is a non-metallic through hole. The coaxial transmission line passes through the through hole A22 and the core wire of the coaxial transmission line is soldered to the middle connecting part A21 using solder wire.

[0027] like Figure 2 As shown, a circular ring B21 is provided at the middle position of the back side of the double-sided PCB antenna radiator A. The circular ring B21 is made of metal copper foil. The circular ring B21 is conductively connected to the outer braid of the coaxial transmission line. In this embodiment, a hole B22 is provided at the center of the circular ring B21. The hole B22 is connected to the through hole A22 on the front side. It is a non-metallized through hole on the substrate, used to insert the inner core of the coaxial transmission line and the Teflon protective layer. The circular ring B21 and the outer braid of the coaxial transmission line are soldered together with tin wire to achieve the conductive effect.

[0028] The back of the double-sided PCB antenna radiator A is provided with a microstrip feed network that connects to the circular ring portion B21.

[0029] The microstrip power supply network is composed of several microstrip line groups of the same size and shape. In this embodiment, there are four microstrip line groups. Each microstrip line group includes a first microstrip line B11, a second microstrip line B12, and a third microstrip line B13 connected in sequence. The outer diameter of the annular portion B21 is tangentially connected to the first microstrip line B11.

[0030] The first microstrip line B11, the second microstrip line B12, and the third microstrip line B13 have different widths, mainly for impedance matching, and the three-segment structure is used for bandwidth matching.

[0031] The first microstrip line B11 is horizontally connected to the second microstrip line B12, and the second microstrip line B12 is vertically connected to the third microstrip line B13.

[0032] The antenna radiator A1 has a slot A3 in the middle. In this embodiment, the slot A3 is an elliptical slot, which increases the current path and squeezes it to the edge, thereby increasing the current density of the Vivaldi antenna, improving the antenna gain, and reducing the antenna size.

[0033] like Figure 4 and Figure 5 As shown, the double-sided PCB antenna radiator A is provided with a non-conductive first through hole A41 and a second through hole A42. The double-sided PCB antenna radiator A is supported and connected to the PCB base plate C1 through the first through hole A41 and the second through hole A42 and the corresponding plastic bolts D1, plastic studs D2 and plastic nuts D3.

[0034] The substrate of the PCB base plate C1 is FR4, which is covered with copper foil. This allows the energy radiated by the antenna on the double-sided PCB antenna radiator A to be reflected when it comes into contact with the PCB base plate C1, so that the radiated energy of the antenna is mainly concentrated in its upper half space.

[0035] The first through hole A41 and the second through hole A42 are located within the groove A3.

[0036] In this embodiment, as Figure 3 As shown, the center hole C11 of the PCB base plate C1 is a through hole. The coaxial transmission line will pass through the center hole C11 and be soldered to the antenna above. Simultaneously, the center hole C11 can limit the movement of the coaxial transmission line, preventing excessive movement that could cause the antenna solder joint to break. The PCB base plate C1 has two holes C21 and C22, which are for positioning and fixing the antenna. After the plastic bolt D1 passes through holes C21 and C22, it is locked in place on the back of the PCB base plate C1 with a plastic nut D3. The holes C31 and C32 on the PCB base plate C1 are positioning holes, which will be fixed and limited to the bottom support of the micro base station. The holes C41 and C42 on the PCB base plate are screw holes, with a different diameter than C31 and C32, providing a foolproof design. They will be locked in place to the corresponding base plate of the base station using metal screws.

[0037] During installation, two plastic bolts D1 are first passed through the first through hole A41 and the second through hole A42 on the double-sided PCB antenna radiator A, respectively. After passing through the plastic bolts D1 on the double-sided PCB antenna radiator A, plastic studs D2 are then threaded onto them. Then, they are passed through the through holes C21 and C22 on the PCB base plate C1 to define the position. Finally, plastic nuts D3 are used on the back side to lock and fix the antenna. Through the above assembly operations, the double-sided PCB antenna radiator A and the PCB base plate C1 can be assembled to form a complete antenna.

[0038] Furthermore, it should be noted that, unless otherwise specified or indicated, the terms "first," "second," "third," etc., in the specification are used only to distinguish the various components, elements, and steps in the specification, and are not used to indicate the logical or sequential relationships between the various components, elements, and steps.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-profile horizontally polarized omnidirectional antenna, characterized in that, The device includes a double-sided PCB antenna radiator (A), on the front of which are provided several petal antenna radiators (A1), and the gaps between each adjacent antenna radiator (A1) form a planar Vivaldi antenna pattern. Each of the antenna radiators (A1) is connected together at the middle position of the double-sided PCB antenna radiator (A) through a middle connecting part (A21) to form a petal-shaped metal radiating whole. The middle connecting part (A21) conducts power to the core wire of the coaxial transmission line.

2. The low-profile horizontally polarized omnidirectional antenna according to claim 1, characterized in that, The double-sided PCB antenna radiator (A) has a circular ring (B21) at the middle position on the back side, and the circular ring (B21) is connected to the outer braid of the coaxial transmission line.

3. The low-profile horizontally polarized omnidirectional antenna according to claim 2, characterized in that, The back of the double-sided PCB antenna radiator (A) is provided with a microstrip feed network connecting the circular ring (B21).

4. The low-profile horizontally polarized omnidirectional antenna according to claim 3, characterized in that, The microstrip power supply network consists of several groups of microstrip lines of the same size and shape. Each group of microstrip lines includes a first microstrip line (B11), a second microstrip line (B12), and a third microstrip line (B13) connected in sequence. The outer diameter of the annular portion (B21) is tangentially connected to the first microstrip line (B11).

5. The low-profile horizontally polarized omnidirectional antenna according to claim 4, characterized in that, The first microstrip line (B11), the second microstrip line (B12), and the third microstrip line (B13) have different widths, and bandwidth matching is achieved through a three-segment structure.

6. The low-profile horizontally polarized omnidirectional antenna according to claim 5, characterized in that, The first microstrip line (B11) is horizontally connected to the second microstrip line (B12), and the second microstrip line (B12) is vertically connected to the third microstrip line (B13).

7. The low-profile horizontally polarized omnidirectional antenna according to claim 1, characterized in that, The antenna radiator (A1) has a slot (A3) in the middle, which increases the current path and squeezes it to the edge, thereby increasing the current density of the Vivaldi antenna and improving the antenna gain.

8. The low-profile horizontally polarized omnidirectional antenna according to claim 1, characterized in that, The double-sided PCB antenna radiator (A) is provided with a non-conductive first through hole (A41) and a second through hole (A42). The double-sided PCB antenna radiator (A) is supported and connected to the PCB base plate (C1) through the first through hole (A41) and the second through hole (A42) and the corresponding plastic bolts (D1), plastic studs (D2) and plastic nuts (D3).

9. The low-profile horizontally polarized omnidirectional antenna according to claim 8, characterized in that, The PCB substrate (C1) is covered with copper foil, so that the energy radiated by the antenna on the double-sided PCB antenna radiator (A) is reflected when it comes into contact with the PCB substrate (C1), so that the radiated energy of the antenna is mainly concentrated in its upper half space.

10. The low-profile horizontally polarized omnidirectional antenna according to claim 8, characterized in that, The first through hole (A41) and the second through hole (A42) are located in the groove (A3).

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