Ultra-bandwidth omnidirectional antenna device and ultra-bandwidth 5G omnidirectional antenna

Abstract

The invention provides an ultra-bandwidth omnidirectional antenna device and an ultra-bandwidth 5G omnidirectional antenna. The ultra-bandwidth omnidirectional antenna device comprises an antenna support and an antenna structure. The antenna structure comprises a flexible dielectric substrate, a micro-strip transmission line, a first radiator and a second radiator, the flexible dielectric substrate is attached to the antenna support, the micro-strip transmission line, the first radiator and the second radiator are all arranged on the face, away from the antenna support, of the flexible dielectric substrate, the micro-strip transmission line is connected with the first radiator, and the second radiator is connected with the micro-strip transmission line. To generate a first resonance bandwidth; the second radiator and the microstrip transmission line are arranged at an interval so as to generate a second resonance bandwidth. By adopting the flexible dielectric substrate, the antenna can be directly attached to the surface of the antenna support, the space occupied by the antenna is prevented from being too large, the space is effectively saved, and the frequency band coverage range is widened through a plurality of resonance frequency bands generated between the microstrip transmission line and the first radiator and between the microstrip transmission line and the second radiator. Therefore, the antenna performance is stable.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of 5G antennas, in particular to an ultra-wideband omnidirectional antenna device and an ultra-wideband 5G omnidirectional antenna. BACKGROUND

[0002] In a mobile communication system, an antenna plays a crucial role, and the coverage of a mobile communication network needs an antenna as a carrier to receive and transmit electromagnetic waves required for network coverage. With the rapid development of 5G antenna technology, the requirements for 5G antenna performance are becoming higher and higher, and there are certain requirements for its working frequency band and antenna size. In order to achieve a wider bandwidth, a larger antenna size is usually used, for example, patent application No. CN116264350A.

[0003] However, in many application scenarios, the spatial size of the antenna design is limited, so that a large size antenna cannot be used, and a larger antenna size also increases the cost and affects the aesthetics. Although the existing technology has miniaturized the antenna size, for example, patent application No. CN114678679A, due to the design space and the crosstalk problem of the adjacent feed signal, the frequency band it covers is usually the mainstream frequency band of 5G, i.e. 3.3-3.6GHz, which cannot cover other frequency bands of 5G, thereby failing to achieve the requirement of ultra-wideband. SUMMARY

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide an ultra-wideband omnidirectional antenna device with wide frequency band coverage and space saving, as well as an ultra-wideband 5G omnidirectional antenna.

[0005] The purpose of the present disclosure is achieved by the following technical solutions: An ultra-wideband omnidirectional antenna device, comprising: an antenna support and an antenna structure; the antenna structure comprises a flexible dielectric substrate, a microstrip transmission line, a first radiator and a second radiator, the flexible dielectric substrate is attached to the antenna support, the microstrip transmission line, the first radiator and the second radiator are all arranged on one side of the flexible dielectric substrate away from the antenna support, the microstrip transmission line is connected with the first radiator to generate a first resonant bandwidth; the second radiator is arranged in a spaced manner with the microstrip transmission line to generate a second resonant bandwidth.

[0006] In one embodiment, the first radiator is rectangular, and the first radiator is located at one end of the microstrip transmission line.

[0007] In one embodiment, the first radiator is provided with a resonant window.

[0008] In one embodiment, the second radiator and the microstrip transmission line are arranged in parallel with each other.

[0009] In one of the embodiments, the second radiator comprises at least two symmetrically arranged first branches, the first branches are connected with the flexible dielectric substrate, and each side of the microstrip transmission line is provided with one of the first branches.

[0010] In one of the embodiments, the second radiator further comprises a ground pad, the ground pad is arranged on the flexible dielectric substrate, the ground pad is connected with each of the first branches, and the ground pad is used for connecting with the outer conductor of the coaxial line.

[0011] In one of the embodiments, the second radiator further comprises at least two second branches, each of the second branches is connected with one of the first branches, the second branches are arranged in parallel with the corresponding first branches to generate a third resonant bandwidth, wherein the first resonant bandwidth is 0.6GHz to 0.96GHz, the second resonant bandwidth is 1.4GHz to 2.7GHz, and the third resonant bandwidth is 3.3GHz to 5GHz.

[0012] In one of the embodiments, the second branch has a bent protrusion, and at least two of the bent protrusions are arranged oppositely.

[0013] In one of the embodiments, the antenna structure further comprises a feeding pad, the feeding pad is connected with one end of the microstrip transmission line away from the first radiator, and the feeding pad is used for connecting with the inner conductor of the coaxial line.

[0014] An ultra-wideband 5G omnidirectional antenna comprises the ultra-wideband omnidirectional antenna device of any one of the above embodiments.

[0015] Compared with the prior art, the present disclosure has at least the following advantages: By adopting the flexible dielectric substrate, the antenna can be directly attached to the surface of the antenna support, avoiding the problem of too large space volume occupied by the antenna size, effectively saving space, and the multiple resonant frequency bands generated between the microstrip transmission line and the first radiator and the second radiator respectively widen the frequency range, thereby stabilizing the performance of the antenna. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 It is a schematic diagram of the ultra-wideband omnidirectional antenna device in one of the embodiments. Figure 2 This is a schematic diagram of the antenna structure in one embodiment; Figure 3 for Figure 2 A schematic diagram of the antenna structure shown from another perspective; Figure 4 This is a graph showing the antenna return loss of an ultra-wideband omnidirectional antenna device. Figure 5 This is a graph showing the antenna standing wave ratio (VSWR) of an ultra-wideband omnidirectional antenna device. Detailed Implementation

[0018] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] This disclosure relates to an ultra-wideband omnidirectional antenna device. In one embodiment, the ultra-wideband omnidirectional antenna device includes an antenna support and an antenna structure. The antenna structure includes a flexible dielectric substrate, a microstrip transmission line, a first radiator, and a second radiator. The flexible dielectric substrate is attached to the antenna support. The microstrip transmission line, the first radiator, and the second radiator are all disposed on the side of the flexible dielectric substrate facing away from the antenna support. The microstrip transmission line is connected to the first radiator to generate a first resonant bandwidth. The second radiator is spaced apart from the microstrip transmission line to generate a second resonant bandwidth. By using a flexible dielectric substrate, the antenna can be directly attached to the surface of the antenna support, avoiding excessive space occupation by the antenna size and effectively saving space. Moreover, the multiple resonant frequency bands generated by the microstrip transmission line with the first and second radiators respectively widen the frequency band coverage, thereby stabilizing the antenna performance.

[0022] Please see Figure 1 This is a schematic diagram of the structure of an ultra-wideband omnidirectional antenna device according to an embodiment of the present disclosure.

[0023] One embodiment of the ultra-wideband omnidirectional antenna device 10 includes an antenna support 100 and an antenna structure 200. Please refer to both. Figure 2 The antenna structure 200 includes a flexible dielectric substrate 210, a microstrip transmission line 220, a first radiator 230, and a second radiator 240. The flexible dielectric substrate 210 is attached to the antenna support 100. The microstrip transmission line 220, the first radiator 230, and the second radiator 240 are all disposed on the side of the flexible dielectric substrate 210 facing away from the antenna support 100. The microstrip transmission line 220 is connected to the first radiator 230 to generate a first resonant bandwidth. The second radiator 240 is spaced apart from the microstrip transmission line 220 to generate a second resonant bandwidth.

[0024] In this embodiment, by employing a flexible dielectric substrate 210, the antenna can be directly attached to the surface of the antenna support 100, avoiding excessive space occupation by the antenna size and effectively saving space. Furthermore, the multiple resonant frequency bands generated between the microstrip transmission line 220 and the first radiator 230 and the second radiator 240 respectively widen the frequency band coverage, thereby stabilizing the antenna performance. The overall length of the microstrip transmission line 220 is 50mm to 55mm, specifically 53mm.

[0025] In one embodiment, please refer to Figure 2The first radiator 230 is rectangular and located at one end of the microstrip transmission line 220. In this embodiment, the first radiator 230 is disposed on the flexible dielectric substrate 210 and electrically connected to one end of the microstrip transmission line 220. A first resonant bandwidth is generated between the first radiator 230 and the microstrip transmission line 220 through multi-section impedance transformation. By limiting the specific shape and structure of the first radiator 230, i.e., its rectangular structure, self-resonance is generated on the first radiator 230, which facilitates the widening of the frequency band of the first resonant bandwidth. Specifically, the length of the first radiator is 50mm to 55mm, and the width is 12mm to 15mm; for example, the length of the first radiator is 52mm and the width is 14mm.

[0026] In one embodiment, please refer to Figure 2 The first radiator 230 has a resonant window 202. In this embodiment, the resonant window 202 is located in the middle of the first radiator 230. Specifically, the resonant window 202 is trapezoidal in shape, with a short side of 12mm, a long side of 14mm, and a height of 7.5mm. By forming the resonant window 202 within the first radiator 230, it is convenient to form multiple branch structures on the first radiator 230, thereby facilitating the widening of the resonant frequency band through the first radiator 230. Moreover, the resonant window 202 forms an internal hollow structure in the first radiator 230, making it easy to adjust the self-resonance of the first radiator 230 to adapt to the selected resonant frequency band.

[0027] In another embodiment, the shape of the resonant window can be of various shapes. By selecting the corresponding shape of the resonant window, the bandwidth of the resonant frequency band of the first radiator can be adjusted, but its frequency band range is still within 0.6 GHz - 0.96 GHz.

[0028] In one embodiment, please refer to Figure 2 The second radiator 240 is arranged parallel to the microstrip transmission line 220. In this embodiment, the second radiator 240 serves as a coupling component with the microstrip transmission line 220. The parallel spacing between the second radiator 240 and the microstrip transmission line 220 creates mutual coupling. Combined with the resonance of the second radiator 240 itself, the second radiator 240 and the microstrip transmission line 220 jointly generate resonance with a second resonant bandwidth, facilitating further widening of the frequency band of the ultra-wideband omnidirectional antenna device.

[0029] In one embodiment, please refer to Figure 2The second radiator 240 includes at least two symmetrically arranged first branches 242, which are connected to the flexible dielectric substrate 210. One first branch 242 is disposed on each side of the microstrip transmission line 220. In this embodiment, the first branches 242 serve as antenna signal radiating components of the second radiator 240. The first branches 242 are disposed on the flexible dielectric substrate 210, and the first branches 242 and the microstrip transmission line 220 are located on the same surface of the flexible dielectric substrate 210. The first branches 242 are located on the sides of the microstrip transmission line 220; specifically, the two first branches 242 are respectively located on both sides of the microstrip transmission line 220, that is, the two first branches 242 are symmetrically distributed with the microstrip transmission line 220 as the central axis. The first stub 242 is parallel to the microstrip transmission line 220, and a gap is formed between the first stub 242 and the microstrip transmission line 220. Coupling is achieved through this gap to generate resonance with a second resonant bandwidth. The range of the second resonant bandwidth is adjusted by changing the width of the gap between the first stub 242 and the microstrip transmission line 220. The length of the first stub is 50mm to 55mm, specifically 53mm.

[0030] In another embodiment, a first stub 242 is provided on each of the left and right sides of the microstrip transmission line 220, that is, two first stubs 242 are symmetrically arranged on the left and right sides of the microstrip transmission line 220, and a gap is provided between the two first stubs 242 and the microstrip transmission line 220. Thus, the mutual coupling between the two first stubs 242 and the microstrip transmission line 220 facilitates the generation of the desired resonant frequency band. Moreover, the coupling distance between the two first stubs 242 and the microstrip transmission line 220 directly affects the resonant bandwidth, allowing the second resonant bandwidth to be adjusted by adjusting the coupling distance. Specifically, the gap width between the two first stubs is 3.2 mm to 3.5 mm, and more specifically, the gap width between the two first stubs is 3.3 mm.

[0031] In another embodiment, multiple parallel first branches can be provided on the left and right sides of the microstrip transmission line to form multiple feed branches, which facilitates the adjustment of the antenna impedance matching.

[0032] Further, please refer to Figure 2The second radiator 240 further includes a grounding pad 244 disposed on the flexible dielectric substrate 210. The grounding pad 244 is connected to each of the first branches 242 and is used to connect to the outer conductor of the coaxial line. In this embodiment, the grounding pad 244 serves as a grounding component for each of the first branches 242, and each of the first branches 242 is electrically connected to the outer conductor of the coaxial line through the grounding pad 244 to generate power.

[0033] In another embodiment, the grounding pad 244 is located at the end of the first branch 242 away from the first radiator 230, that is, the grounding pad 244 and the first radiator 230 are symmetrically arranged with the first branch 242 as the center.

[0034] In another embodiment, the grounding pad is located between two oppositely arranged first branches, that is, the grounding pad is electrically connected to the ends of the first branches on the left and right sides of the microstrip transmission line, so as to connect each first branch to the outer conductor of the coaxial line, thereby realizing the common ground of each first branch.

[0035] Furthermore, please refer to Figure 2 The second radiator 240 further includes at least two second branches 246, each second branch 246 being connected to a first branch 242. The second branches 246 and their corresponding first branches 242 are arranged parallel to each other to generate a third resonant bandwidth, wherein the first resonant bandwidth is 0.6 GHz to 0.96 GHz, the second resonant bandwidth is 1.4 GHz to 2.7 GHz, and the third resonant bandwidth is 3.3 GHz to 5 GHz. In this embodiment, the second branches 246 and the first branches 242 are connected in a one-to-one correspondence. The second branch 246 serves as a coupling component with the first branch 242. Specifically, the second branch 246 is connected to the end of the first branch 242 closest to the first radiator 230, and the second branch 246 is bent to be parallel to the first branch 242. A gap is formed between the second stub 246 and the first stub 242, and the second stub 246 and the first stub 242 are coupled to each other through the gap to generate resonance in the third resonant bandwidth, thereby increasing the frequency band covered by the ultra-wideband omnidirectional antenna device. Specifically, the microstrip transmission line 220 is connected to the first radiator 230, generating a resonance of 0.6 GHz to 0.96 GHz through multi-section impedance transformation and its own resonance; the second radiator 240 generates a resonance of 1.4 GHz to 2.7 GHz through its own resonance and mutual coupling with the microstrip transmission line 220; and the first stub 242 and the second stub 246 of the second radiator 240 are coupled to each other through the gap to generate a resonance of 3.3 GHz to 5 GHz.

[0036] In another embodiment, a second branch 246 is provided at the upper end of the first branch 242. The second branch 246 is bent and extends downward along the outer side of the first branch 242, and a gap is provided between it and the first branch 242. This allows the first branch 242 and the second branch 246 of the second radiator 240 to couple with each other through the gap. This facilitates the generation of a third resonant bandwidth through the coupling between the two different branches of the second radiator 240, adapting to the wideband requirements of 5G antenna signals. The gap width between the first branch and the second branch is 2.2 mm to 2.6 mm, specifically, the gap width between the first branch and the second branch is 2.5 mm.

[0037] In another embodiment, each first stub is connected to multiple second stubs, i.e., multiple second stubs are arranged side by side to form multiple coupled stubs, thereby improving antenna performance. The length of the second stub is 65mm to 68mm, specifically, the length of the second stub is 66mm.

[0038] In another embodiment, please refer to Figure 2 The second stub 246 has a bent protrusion 2462, and at least two of the bent protrusions 2462 are arranged opposite to each other. In this embodiment, the bent protrusion 2462 is located at the end of the second stub 246 away from the first radiator 230. The bent protrusions 2462 of the two oppositely arranged second stubs 246 are arranged facing each other, which adds one more stub to the second stub 246, thereby enabling mutual coupling between the two opposite second stubs 246 and thus stabilizing the antenna performance.

[0039] In another embodiment, the bent protrusion 2462 and the first radiator 230 are symmetrically arranged with the microstrip transmission line 220 as the center, that is, the bent protrusion 2462 is located near one end of the microstrip transmission line 220, and the first radiator 230 is located near the other end of the microstrip transmission line 220.

[0040] In one embodiment, please refer to Figure 2 The antenna structure 200 further includes a feed pad 250, which is connected to the end of the microstrip transmission line 220 away from the first radiator 230. The feed pad 250 is used to connect to the inner conductor of the coaxial line. In this embodiment, the feed pad 250 is located at one end of the microstrip transmission line 220, and serves as the feed point for the microstrip transmission line 220. The antenna signals of each resonant frequency band are transmitted to the inner conductor of the coaxial line through the feed pad 250, facilitating timely transmission of the antenna signals.

[0041] In another embodiment, the power pad 250 and the ground pad 244 are both located at the same end of the microstrip transmission line 220, that is, the power pad 250 and the ground pad 244 are both located at the end of the microstrip transmission line 220 away from the first radiator 230.

[0042] In another embodiment, the feed pad is disposed on the microstrip transmission line and soldered to the microstrip transmission line. The microstrip transmission line transmits the fed antenna signal to the inner conductor of the coaxial line through the feed pad, which facilitates the centralized transmission and reception of the antenna signal.

[0043] In another embodiment, the inner conductor and outer conductor of the coaxial line are isolated from each other, that is, an insulating layer is wrapped between the inner conductor and outer conductor of the coaxial line to facilitate the insulation of the power supply and grounding from each other.

[0044] In one embodiment, please refer to Figure 3 The antenna structure 200 further includes an antenna PCB board 260, which is located on the side of the flexible dielectric substrate 210 opposite to the microstrip transmission line 220. The antenna PCB board 260 corresponds to the feed pad 250 to adjust the antenna impedance matching. In this embodiment, the antenna PCB board 260 has a single-sided copper-clad structure, and the substrate of the antenna PCB board 260 is FR4 material. The copper-free side of the antenna PCB board 260 is adhered to a specific position on the back of the flexible dielectric substrate 210 using adhesive, i.e., the antenna PCB board 260 is positioned opposite to the feed pad 250. By adding the antenna PCB board 260, the ultra-wideband omnidirectional antenna device can adjust the antenna impedance matching, improve the antenna efficiency, and thus improve the antenna performance, for example, by having better return loss and voltage standing wave ratio. See details below. Figure 4 and 5 Therefore, it can be seen that the return loss is less than -10dB and the standing wave reflection coefficient is less than 2 in the frequency range of 600-5000MHz, indicating that the antenna has excellent broadband characteristics.

[0045] In another embodiment, the antenna PCB board includes a PCB substrate and a copper-clad circuit layer. The PCB substrate is bonded to a flexible dielectric substrate, and the copper-clad circuit layer is disposed on the side of the PCB substrate facing away from the flexible dielectric substrate. The copper-clad circuit layer serves as a circuit board connected to the controller MCU, which facilitates the adjustment of the antenna structure performance through the antenna PCB board, such as the selection of different resonant frequency bands to adapt to the use of 5G antenna signals.

[0046] In another embodiment, the antenna PCB is electrically connected to the feed pad and the ground pad. Specifically, the antenna PCB is electrically connected to the feed pad and the ground pad via a coaxial cable.

[0047] In one embodiment, this disclosure also provides an ultra-wideband 5G omnidirectional antenna, including the ultra-wideband omnidirectional antenna device described in any of the above embodiments. In this embodiment, the ultra-wideband omnidirectional antenna device includes an antenna support and an antenna structure; the antenna structure includes a flexible dielectric substrate, a microstrip transmission line, a first radiator, and a second radiator. The flexible dielectric substrate is attached to the antenna support. The microstrip transmission line, the first radiator, and the second radiator are all disposed on the side of the flexible dielectric substrate facing away from the antenna support. The microstrip transmission line is connected to the first radiator to generate a first resonant bandwidth; the second radiator is spaced apart from the microstrip transmission line to generate a second resonant bandwidth. By using a flexible dielectric substrate, it is convenient to directly attach the antenna to the surface of the antenna support, avoiding excessive space occupied by the antenna size, effectively saving space. Moreover, the multiple resonant frequency bands generated between the microstrip transmission line and the first and second radiators respectively widen the frequency band coverage, thereby stabilizing the antenna performance.

[0048] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An ultra-wideband omnidirectional antenna device, characterized in that, include: Antenna support An antenna structure is provided, comprising a flexible dielectric substrate, a microstrip transmission line, a first radiator, and a second radiator. The flexible dielectric substrate is attached to an antenna support. The microstrip transmission line, the first radiator, and the second radiator are all disposed on the side of the flexible dielectric substrate facing away from the antenna support. The microstrip transmission line is connected to the first radiator to generate a first resonant bandwidth. The second radiator is spaced apart from the microstrip transmission line to generate a second resonant bandwidth.

2. The ultra-wideband omnidirectional antenna device according to claim 1, characterized in that, The first radiator has a resonant window.

3. The ultra-wideband omnidirectional antenna device according to claim 1, characterized in that, The second radiator is arranged parallel to the microstrip transmission line.

4. The ultra-wideband omnidirectional antenna device according to claim 1, characterized in that, The second radiator includes at least two symmetrically arranged first branches, which are connected to the flexible dielectric substrate. A first branch is provided on each side of the microstrip transmission line.

5. The ultra-wideband omnidirectional antenna device according to claim 4, characterized in that, The second radiator further includes a grounding pad disposed on the flexible dielectric substrate. The grounding pad is connected to each of the first branches and is used to connect to the coaxial external conductor.

6. The ultra-wideband omnidirectional antenna device according to claim 4, characterized in that, The second radiator further includes at least two second branches, each second branch being connected to a first branch, and the second branches and corresponding first branches being arranged parallel to each other to generate a third resonant bandwidth, wherein the first resonant bandwidth is 0.6 GHz to 0.96 GHz, the second resonant bandwidth is 1.4 GHz to 2.7 GHz, and the third resonant bandwidth is 3.3 GHz to 5 GHz.

7. The ultra-wideband omnidirectional antenna device according to claim 6, characterized in that, The second branch has a bent protrusion, and at least two of the bent protrusions are arranged opposite each other.

8. The ultra-wideband omnidirectional antenna device according to claim 1, characterized in that, The antenna structure also includes a feed pad, which is connected to the end of the microstrip transmission line away from the first radiator. The feed pad is used to connect to the inner conductor of the coaxial line.

9. The ultra-wideband omnidirectional antenna device according to claim 1, characterized in that, The first radiator is rectangular and is located at one end of the microstrip transmission line.

10. An ultra-wideband 5G omnidirectional antenna, characterized in that, Includes the ultra-wideband omnidirectional antenna device as described in any one of claims 1 to 9.

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