Omnidirectional antenna, antenna array and manufacturing method

Abstract

The present application discloses an omnidirectional antenna, an antenna array and a manufacturing method. The omnidirectional antenna is whip-shaped, including a first radiating unit, a second radiating unit, a phase modulation circuit, an excitation end and a passive director; the phase modulation circuit is connected between the first radiating unit and the second radiating unit; the passive director is located at the lower side of the excitation end when the antenna is placed vertically upward; the first radiating unit and the second radiating unit are used to receive power from the excitation end to send or receive radio frequency signals; the phase modulation circuit is used to change the phase to synchronize the phases of adjacent radiating units; the passive director is used to make the main lobe radiation angle of the antenna downward. The antenna, antenna array and manufacturing method disclosed in the present application all use the passive director to make the main lobe of the antenna downward and improve the antenna performance.

Description

Technical Field

[0001] The present invention generally relates to the field of antenna technology. More specifically, the present invention relates to an omnidirectional antenna, an antenna array and a manufacturing method thereof. Background Art

[0002] Traditional omnidirectional fiberglass antennas are mainly divided into two types from the perspective of radiation direction: one is that the main beam is in the horizontal direction, and the other is that the main beam is slightly tilted upward. In addition, on the E-plane radiation diagram, the farther away from the main beam, the more rapidly the gain decreases. In the application scenario of high-rise buildings, when the antenna is installed at the highest point on the top, it is easy to cause the situation of "darkness under the lamp", that is, the antenna gain directly below the building where the antenna is deployed is low and the coverage is poor. When deploying regional wireless networks, traditional antennas concentrate energy in the horizontal direction, which will lead to poor coverage of the deployed area. In order to achieve beam downtilt, MIMO array technology and beamforming technology are generally used in traditional base station antennas. By controlling the amplitude and phase of each feed point of the feed network, beam downtilt is achieved. For a binary or ternary array with a single feed point, since the phase of the radiating unit close to the feed point must be ahead of the radiating unit far away from the feed point and the amplitude is the same, it is impossible to achieve the downtilt of the main beam angle in principle.

[0003] On the other hand, the traditional omnidirectional fiberglass antenna is passive. When deployed outdoors, it is necessary to use expensive low-loss armored RF cables to transmit the RF signal to the antenna. Although the traditional outdoor deployment extension antenna requires the gateway to be as close to the antenna as possible during design, the actual deployment often encounters the problem of long feeder lines causing serious signal transmission attenuation, which has a great impact on performance. The use of RF cables with lower loss is very expensive.

[0004] In the Sub 1G frequency band, it is difficult to deploy traditional antennas on a large scale using MIMO technology. The large size of high-gain antennas leads to high antenna costs, which affects the scale of commercial deployment. Summary of the invention

[0005] In order to at least solve the technical problems described in the above background technology section, the present invention proposes an omnidirectional antenna, an antenna array and a manufacturing method. By using the solution of the present invention, the main beam of the antenna vertical plane can be effectively tilted down and a higher antenna gain can be obtained. In view of this, the present invention provides solutions in the following aspects.

[0006] The first aspect of the present invention provides an omnidirectional antenna with a whip-shaped appearance, characterized in that it includes a first radiating unit, a second radiating unit, a phase modulation circuit, an excitation end and a passive director; the phase modulation circuit is connected between the first radiating unit and the second radiating unit; the passive director is located at the lower side of the excitation end when the antenna is placed vertically upward; the first radiating unit and the second radiating unit are used to receive power fed by the excitation end to send or receive radio frequency signals; the phase modulation circuit is used to change the phase to synchronize the phases of adjacent radiating units; the passive director and the antenna are located on the same PCB, so that the antenna as a whole is whip-shaped, which is used to tilt the main lobe of the antenna downward.

[0007] In one embodiment, the phase modulation circuit is composed of a physically separated first phase modulation circuit and a second phase modulation circuit, and the phase modulation circuit is also used to increase the physical distance between the radiation units.

[0008] In one embodiment, a reference ground line is further provided, and the reference ground line is arranged between the radiation unit and the excitation end.

[0009] In one embodiment, the reference ground line includes a ground line and a linear array formed by rectangular pads, and the antenna standing wave is adjusted by connecting the end of the ground line to a preset number of pads in the linear array.

[0010] In one embodiment, at least one of the first radiation unit, the second radiation unit, and the ground line is a bent structure.

[0011] In one embodiment, a radio frequency front-end chip is also provided, and the radio frequency front-end chip is arranged between the excitation end and the director, so that the modulation and demodulation chip is arranged in the antenna package; the radio frequency front-end chip performs impedance matching through the PCB of the director; and transmits energy directly to the radiation unit through the reference ground line.

[0012] In one embodiment, the RF front-end chip includes a modem.

[0013] The second aspect of the present invention provides an omnidirectional antenna array, which is composed of the omnidirectional antenna described in any one of the above items, and also includes a wired bus communication unit and a gateway control management unit; the wired bus communication unit is used to connect the gateway control management unit with multiple omnidirectional antennas; the gateway control management unit controls the corresponding omnidirectional antennas to communicate in time through the wired bus communication unit, and the omnidirectional antennas with different radiation angles transmit simultaneously, and the antennas with the same radiation angle do not transmit simultaneously.

[0014] The third aspect of the present invention provides a method for manufacturing an omnidirectional antenna, which is used to manufacture the omnidirectional antenna described in any of the above items, including adjusting the downtilt angle of the antenna main lobe by adjusting one or more of the following parameters: the length of the passive director; the distance between the passive director and the radiating unit; the distance between the passive director and the short-circuit bottom line.

[0015] In one embodiment, it also includes: setting a ground wire and a rectangular pad in the reference ground wire to form a linear array, and adjusting the antenna standing wave by connecting the end of the ground wire with a preset number of pads in the linear array.

[0016] In one embodiment, the RF front-end chip is further arranged between the excitation end and the director, so that the RF front-end chip is arranged in the antenna package; the RF front-end chip is impedance matched through the PCB of the director; and the energy is directly transmitted to the radiation unit through the reference ground line.

[0017] In one embodiment, the RF front-end chip includes a modem.

[0018] In one embodiment, it also includes: connecting the omnidirectional antenna and the gateway through a twisted pair cable; the twisted pair cable is used to simultaneously transmit digital communication signals and power supply signals.

[0019] By utilizing the solution provided by the present invention, the downward tilt angle of the main lobe of the antenna can be effectively adjusted through the use of a passive director, and the rectangular pad array provided in the reference ground wire module can be used to facilitate the adjustment of the antenna standing wave, thereby improving the antenna performance while also improving the adaptability of the antenna; and by providing the modulation and demodulation module in the antenna package, the transmission loss problem is solved and the radiation efficiency of the antenna is improved; and in the present invention, by providing the RF front-end chip in the internal package of the antenna, the omnidirectional antenna of the present invention can be powered and communicated with an external gateway through a twisted pair cable, thereby greatly reducing the transmission cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0021] Figure 1 is a schematic diagram showing the connection of an omnidirectional antenna module according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram showing an omnidirectional antenna according to an embodiment of the present invention;

[0023] Figure 3is a partial schematic diagram showing an excitation end and a reference ground line of an omnidirectional antenna according to an embodiment of the present invention;

[0024] Figure 4 is a partial schematic diagram showing a phase modulation circuit of an omnidirectional antenna according to an embodiment of the present invention;

[0025] Figure 5 is an E-plane radiation diagram of an omnidirectional antenna according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram showing the connection of an omnidirectional antenna array module according to an embodiment of the present invention;

[0027] Figure 7 It is a physical schematic diagram of an omnidirectional antenna array according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] It should be understood that the terms "first", "second", "third" and "fourth" etc. in the claims, specifications and drawings of the present invention are used to distinguish different objects rather than to describe a specific order. The terms "include" and "comprise" used in the specification and claims of the present invention indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0030] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the claims, the singular forms of "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the specification of the present invention and the claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0031] As used in this specification and claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0032] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] The first aspect of the present invention provides an omnidirectional antenna. The overall structure of the omnidirectional antenna of the present invention can be found in Figure 1 and Figure 2 .in, Figure 1 is a schematic diagram showing the connection of an omnidirectional antenna module according to an embodiment of the present invention, Figure 2 Schematic diagram of an omnidirectional antenna according to an embodiment of the present invention. Specifically, the omnidirectional antenna provided by the present invention is a whip antenna, comprising: a first radiating unit 3, a second radiating unit 4, a phase modulation circuit 5, an excitation terminal 1 and a passive director 6;

[0034] The phase modulation circuit 5 is connected between the first radiation unit 3 and the second radiation unit 4;

[0035] The passive director 6 is located at the lower side of the excitation end 1 when the antenna is placed vertically upward;

[0036] The first radiation unit 3 and the second radiation unit 4 are used to receive the feeding of the excitation end 1 to send or receive radio frequency signals;

[0037] The phase modulation circuit 5 is used to change the phase so as to synchronize the phases of adjacent radiating units;

[0038] The passive director 6 and the antenna are located on the same PCB, so that the antenna as a whole presents a whip shape, which is used to tilt the main lobe of the antenna downward.

[0039] In an embodiment of the present invention, by adding a passive director 6 at the bottom of the antenna, the single-feed point multi-element half-wave array omnidirectional antenna of the present invention can achieve the radiation direction of the antenna being omnidirectional in the horizontal plane and the main beam being downtilted in the vertical plane. The passive director 6 described in the present invention is a metal copper clad spaced from the antenna, and is integrally formed on the PCB with the antenna. The length of the passive director 6 is slightly less than λ / 2, and as the length increases, the downtilt effect becomes better. The shorter the distance between the passive director 6 and the radiation unit, the better the downtilt effect. The width of the passive director 6 is the same as that of the PCB board, and within a certain range, the wider it is, the better the downtilt guiding effect. The antenna of the present invention is protected as a whole by an outer shell made of fiberglass or other materials, and is sealed with a sealant to achieve the functions of waterproofing and dustproofing.

[0040] In a preferred embodiment of the present invention, the shape structure of the first radiation unit 3 and the second radiation unit 4 is a bending structure. The purpose of using the bending structure in the present invention is to increase the path through which the current flows and reduce the physical size of the radiation unit. Specifically, the bending structure can be various regular or irregular bending structures, such as a wavy structure, a broken line structure, or a sawtooth structure. The lengths of the above-mentioned radiation units are not exactly the same. Starting with the first radiation unit, the lengths of the subsequent one or more radiation units can increase successively, so as to improve the gain. Preferably, the length of the first radiation unit in the present invention is approximately around 0.5λ, where λ is the wavelength of the used frequency band in this structural state.

[0041] In a preferred embodiment of the present invention, pads are provided on the upper and lower sides of the excitation end 1, such as Figure 3 shown. Figure 3 A partial schematic diagram of the excitation end and reference ground line of an omnidirectional antenna according to an embodiment of the present invention is shown. The excitation end 1 mentioned above is connected between the pad 11 and the pad 12, and a short-circuit bottom line 13 is arranged below the pad 12. The pad 11 is used for welding the core wire of the coaxial line, the pad 12 is used for welding the outer conductor of the coaxial line, and the short-circuit bottom line 13 is used to adjust the impedance matching of the antenna. By welding the core wire and the outer conductor of a 50-ohm coaxial cable, the other end of the coaxial line is connected to the RF connector to provide excitation. In the present invention, the capacitive reactance of the antenna can also be adjusted by adjusting the distance between the excitation end 1 and the short-circuit bottom line 13. It should be noted that there is a certain distance between the passive director 6 and the bottom line 13 mentioned above. If the distance is too small, coupling with the antenna will occur, affecting the impedance matching of the antenna. Proper adjustment of the distance is conducive to antenna impedance matching.

[0042] In a preferred embodiment of the present invention, the phase modulation circuit is composed of a physically separated first phase modulation circuit and a second phase modulation circuit, and the phase modulation circuit is also used to increase the physical distance between the radiation units. Figure 4 , which is a partial schematic diagram of a phase modulation circuit of an omnidirectional antenna according to an embodiment of the present invention. Figure 4In the embodiment, the phase modulation circuit 5 includes a first phase modulation circuit 51 and a second phase modulation circuit 52. The phase modulation circuit 5 in the present invention is used to change the phase so as to synchronize the phases of adjacent radiation units to achieve field superposition. The two phase modulation circuits 51 and 52 are both axially symmetrical structures. In the present invention, two physically separated phase modulation circuits are provided so that when the total length of the phase modulation circuit is constant, the length of one phase modulation circuit can be reduced and the length of the other phase modulation circuit can be increased, thereby increasing the physical spacing between the radiation units and improving the gain. Preferably, the total length of the phase modulation circuit is about 0.5λ, and the spacing between the two radiation units is about λ / 6, which is fine-tuned according to actual conditions.

[0043] In a preferred embodiment of the present invention, the PCB part array of the antenna is composed of at least two radiating elements and one phase modulation circuit, which can be stacked one after another. The combination of multiple radiating elements and phase modulation circuits should be within the protection range.

[0044] In a preferred embodiment of the present invention, a reference ground line 2 is further provided, and the reference ground line is arranged between the radiation unit 3 and the excitation end 1. Figure 3 The reference ground wire 2 includes a ground wire 21 and a linear array 22 formed by rectangular pads. The antenna standing wave is adjusted by connecting the end of the ground wire 21 to a preset number of pads in the linear array 22. The ground wire 21 is an ordinary rectangular straight line, and the antenna inductance is adjusted by adjusting the length. In the present invention, the ground wire 2 also adopts a multi-bend structure, and the bend structure can be various regular or irregular bend structures, such as a wavy structure or a fold line structure or a sawtooth structure. The inductance can be adjusted by adjusting the length of the ground wire 21, and the inductance can be efficiently adjusted within a smaller size range by adjusting the distance between the bends, so that the adjustment of the antenna is not limited to the distance between the excitation end and the bottom line 13. The bending structure of the ground wire 21 is also conducive to shortening the distance between the first radiation unit 3 and the passive director 6, which can effectively enhance the steering effect and easily make the main beam of the antenna tilt downward. Preferably, the distance between the radiation unit and the director is controlled within 0.4λ.

[0045] The above-mentioned linear array 22 is specifically a linear array composed of multiple rectangular pads, and the size of each pad is set to be 1mm in length and the same width as the reference ground line. The spacing between the linear arrays is 0.5mm. The number of linear arrays is not limited and is set according to actual needs. The end of the ground wire 21 is also a pad. During the actual production process, the end pad of the ground wire 21 and an appropriate number of rectangular pads in the linear array 22 can be soldered together to quickly debug the standing wave, while omitting the complex changes to the antenna, which greatly enhances the adaptability of the antenna. It should be noted that the above-mentioned pad size, shape, linear array spacing, and array number are all exemplary statements, and the remaining settings can also be adjusted according to actual needs.

[0046] In a preferred embodiment of the present invention, the omnidirectional antenna also includes a radio frequency front-end chip, which is arranged between the excitation end and the director, so that the modulation and demodulation chip is arranged in the antenna package; the radio frequency front-end chip is impedance matched through the PCB of the director; and the energy is directly transmitted to the radiation unit through the reference ground line.

[0047] Figure 2 In the figure, the RF front-end chip is arranged at the excitation end 1 of the antenna (not shown in the figure), specifically, the area from below the excitation end 1 to above the director 6. The RF front-end chip transmits energy matching to the antenna radiation unit through the impedance line. The director of the antenna is below the RF chip, thereby changing the radiation direction of the antenna. Preferably, the RF front-end chip can be a modem or a RF base station.

[0048] In the present invention, by arranging the RF front-end chip in the antenna package, the omnidirectional antenna of the present invention can be powered and communicated with the external gateway through an ordinary twisted pair. Specifically, one wire in the twisted pair is the GND ground, and the other wire is the signal line and the power supply line. Since the baseband signal transmitted in the twisted pair is a low-frequency signal, the wired frequency band of the signal is within 20Mhz, and the operating frequency band of the RF signal is above 433MHz, such as 868Mhz and 2.4Ghz. Therefore, compared with the RF coaxial RF cable, there is no need to make an expensive shielding layer and limit the radiation loss, thereby greatly reducing the transmission cost.

[0049] The present invention uses a passive director to effectively adjust the downtilt angle of the antenna main lobe. The rectangular pad array set in the reference ground wire module facilitates the adjustment of the antenna standing wave, which improves the antenna performance and the adaptability of the antenna. The modem module is set in the antenna package to solve the transmission loss problem, reduce the transmission cost, and improve the radiation efficiency of the antenna. Please refer to Figure 5 , Figure 5 The E-plane radiation pattern of the omnidirectional antenna of the embodiment of the present invention. The omnidirectional antenna of the present invention achieves a maximum gain of 5.2dBi, a standing wave within 1.6 in the entire frequency band, a main lobe downward tilt angle of 12 degrees, and makes the antenna mainly radiate energy in the horizontal plane and below, greatly improving energy utilization.

[0050] The second aspect of the present invention provides an omnidirectional antenna array. The overall structure of the omnidirectional antenna array of the present invention can be found in Figure 6 and Figure 7 .in, Figure 6 is a schematic diagram showing the connection of an omnidirectional antenna array module according to an embodiment of the present invention, Figure 7Schematic diagram of an omnidirectional antenna array according to an embodiment of the present invention. Specifically, the present invention provides an omnidirectional antenna array, including the omnidirectional antenna disclosed above, and also including a wired bus communication unit and a gateway control management unit;

[0051] The wired bus communication unit is used to connect the gateway control management unit and the plurality of omnidirectional antennas;

[0052] The gateway control management unit controls the corresponding omnidirectional antenna to communicate in time-sharing manner through the wired bus communication unit. The omnidirectional antennas with different radiation angles transmit simultaneously, while the antennas with the same radiation angle do not transmit simultaneously.

[0053] In the embodiment of the present invention, by using antennas with different directors and different optimal gain frequencies, in the antenna array, the radiation gain downtilt angles of different antennas are different, thereby achieving full space coverage for different radiation angles.

[0054] In the embodiment of the present invention, the omnidirectional antenna is composed of an optional RF modulation and demodulation module (impedance matching end, RF front-end circuit), an antenna PCB and an external structural component (including an antenna interface, an antenna board, and a fiberglass shell). When multiple omnidirectional antennas are used to form an antenna array, the overall system includes: a gateway control management unit, a bus communication unit, an antenna end bus communication unit, a RF modulation and demodulation unit, a RF front-end matching circuit, and a single antenna unit. Figure 6 As shown. Preferably, the above-mentioned gateway control and management unit and wired bus communication unit are inside the wireless gateway of the Internet of Things, and the wired bus communication unit is responsible for converting the electrical signals of gateway control and management into wired bus communication signals. The gateway casing reserves a waterproof cable connector to connect with each antenna. The cables include power supply cables and communication cables, and the communication technologies include but are not limited to CAN bus, 485, carrier communication, single bus communication and other technical solutions. At the antenna end, the signal sent by the gateway control and management module is converted into an electrical drive signal of the RF modulation and demodulation unit through a wired communication unit arranged at the antenna end. The RF modulation and demodulation unit generates a RF signal or receives the RF signal transmitted by the antenna, and the RF front-end circuit is responsible for matching and filtering functions.

[0055] In the prior art, antennas are installed on the roofs of high-rise buildings, which require radiation to cover the entire range of nearby buildings, including the ground floor. For ordinary horizontal high-gain omnidirectional antennas, it is easy to make the signal on the lower floors very poor, resulting in failure to meet the usage scenario. The present invention can solve such problems by setting up an antenna array at a long distance, which can well cover all floors of nearby buildings. The gateway and its antenna array can be extended by wires, so that the antennas in the antenna array can be deployed at a longer distance, thereby achieving better radiation to the space. For example, each sub-antenna can be set up on the edges of the roof in different directions to achieve a wider coverage range.

[0056] based on Figure 1-Figure 5 The third aspect of the present invention further provides a method for manufacturing an omnidirectional antenna; the manufacturing method can be implemented Figure 1-Figure 5 The omnidirectional antenna described herein can achieve the purpose of downtilting the main lobe of the antenna and improving the antenna performance. Specifically, the present invention provides an omnidirectional antenna manufacturing method, comprising: adjusting the downtilt angle of the main lobe of the antenna by adjusting one or more of the following parameters:

[0057] The length of the passive director;

[0058] The distance between the passive director and the radiating element;

[0059] The distance between the passive director and the short-circuit bottom line.

[0060] Also includes;

[0061] A grounding wire and a rectangular pad are arranged in the reference ground line to form a linear array, and the antenna standing wave is adjusted by connecting the end of the grounding wire with a preset number of pads in the linear array.

[0062] Also includes;

[0063] The active radio frequency modulation and demodulation module is packaged together with the antenna body.

[0064] Although this specification has shown and described a plurality of embodiments of the present invention, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will appreciate many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular compositions, equivalents or alternatives within the scope of these claims.

Claims

1. An omnidirectional antenna, characterized in that: It includes a first radiation unit, a second radiation unit, a phase modulation circuit, an excitation end and a passive director; The phase modulation circuit is connected between the first radiation unit and the second radiation unit; the passive director is located at the lower side of the excitation end when the antenna is placed vertically upward; The first radiation unit and the second radiation unit are used to receive power feeding from the excitation end to send or receive radio frequency signals; The phase modulation circuit is used to change the phase so as to synchronize the phases of adjacent radiating units; The passive director and the antenna are located on the same PCB, so that the antenna as a whole presents a whip shape, which is used to tilt the main lobe of the antenna downward; The phase modulation circuit is composed of a physically separated first phase modulation circuit and a second phase modulation circuit, and the phase modulation circuit is also used to increase the physical distance between the radiation units; A reference ground line is also provided, and the reference ground line is arranged between the radiation unit and the excitation end; The reference ground line includes a ground line and a linear array formed by rectangular pads, and the antenna standing wave is adjusted by connecting the end of the ground line with a preset number of pads in the linear array.

2. The omnidirectional antenna according to claim 1, characterized in that: At least one of the first radiation unit, the second radiation unit, and the ground wire is a bent structure.

3. The omnidirectional antenna according to claim 2, characterized in that: A radio frequency front-end chip is also provided, and the radio frequency front-end chip is arranged between the excitation end and the director, so that the modulation and demodulation chip is arranged in the antenna package; the radio frequency front-end chip performs impedance matching through the PCB of the director; and transmits energy directly to the radiation unit through the reference ground line.

4. The omnidirectional antenna according to claim 3, characterized in that: The radio frequency front-end chip includes a modem.

5. An omnidirectional antenna array, comprising the omnidirectional antenna according to any one of claims 1 to 4, characterized in that: It also includes a wired bus communication unit and a gateway control management unit; The wired bus communication unit is used to connect the gateway control management unit and the plurality of omnidirectional antennas; The gateway control management unit controls the corresponding omnidirectional antenna to communicate in time-sharing manner through the wired bus communication unit. The omnidirectional antennas with different radiation angles transmit at the same time, while the antennas with the same radiation angle do not transmit at the same time.

6. A method for manufacturing an omnidirectional antenna, used to manufacture the omnidirectional antenna according to any one of claims 1 to 4, characterized in that: This includes adjusting the antenna main lobe downtilt angle by adjusting one or more of the following parameters: The length of the passive director; The distance between the passive director and the radiating element; The distance between the passive director and the short-circuit bottom line.

7. The method for manufacturing an omnidirectional antenna according to claim 6, characterized in that: Also includes; A grounding wire and a rectangular pad are arranged in the reference ground line to form a linear array, and the antenna standing wave is adjusted by connecting the end of the grounding wire with a preset number of pads in the linear array.

8. The method for manufacturing an omnidirectional antenna according to claim 7, characterized in that: Also includes; The RF front-end chip is arranged between the excitation end and the director, so that the RF front-end chip is arranged in the antenna package; The RF front-end chip performs impedance matching through the PCB of the director; and transmits energy directly to the radiation unit through the reference ground line.

9. The method for manufacturing an omnidirectional antenna according to claim 8, characterized in that: The radio frequency front-end chip includes a modem.

10. The method for manufacturing an omnidirectional antenna according to claim 9, characterized in that: Also includes; Connect the omnidirectional antenna and gateway via twisted pair cable; The twisted pair is used to transmit digital communication signals and power supply signals simultaneously.

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