Vehicle-mounted omnidirectional ultra-wideband antenna and shark fin antenna device

Abstract

The vehicle-mounted omnidirectional ultra-wideband antenna comprises a substrate, the back surface of the substrate is provided with a first radiation floor, the front surface of the substrate is provided with a radiation branch knot, a transmission line and a second radiation floor, one end of the transmission line is connected with the radiation branch knot, and the other end of the transmission line is connected with the second radiation floor. The two sides of the transmission line are respectively provided with the second radiation floor, the second radiation floors are electrically connected with the first radiation floor, and the whole radiation branch knot is circular. The vehicle-mounted omnidirectional ultra-wideband antenna is small and compact in structure, has good total radiation efficiency, is particularly suitable for being placed in a shark fin antenna device, can effectively cover the bandwidth from 2.4 GHz to 10.5 GHz, and can realize the coverage of BLE / WALN / UWB antenna frequency bands, so that the number of antennas in the shark fin antenna device can be reduced, and the service life of the shark fin antenna device is prolonged. And the integral performance of the shark fin antenna device can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted communication, in particular to a vehicle-mounted omnidirectional ultra-wideband antenna and a shark fin antenna device. Background Art

[0002] In order to realize functions such as vehicle interconnection and sharing of traffic information, more antennas need to be placed in the shark fin antenna device. However, due to the limitation of the shell structure size of the shark fin antenna device, the distance between the antennas is small, so that the isolation between the antennas is reduced, and the performance of the antenna is seriously affected. Therefore, how to cover a wider frequency band with fewer antennas has always been a hot issue for practitioners. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a vehicle-mounted omnidirectional ultra-wideband antenna that can cover a bandwidth of 2.4 GHz to 10.5 GHz, and a shark fin antenna device having the vehicle-mounted omnidirectional ultra-wideband antenna.

[0004] In order to solve the above technical problems, the first technical solution adopted by the utility model is: a vehicle-mounted omnidirectional ultra-wideband antenna, comprising a substrate, a first radiation floor is provided on the back of the substrate, a radiation branch, a transmission line and a second radiation floor are provided on the front of the substrate, one end of the transmission line is connected to the radiation branch, and the second radiation floor is provided on both sides of the transmission line respectively, the second radiation floor is electrically connected to the first radiation floor, and the radiation branch is circular as a whole.

[0005] In one embodiment, the vehicle-mounted omnidirectional ultra-wideband antenna is a bilaterally symmetrical structure.

[0006] In one embodiment, the second radiation floor is electrically connected to the first radiation floor through a metallized hole.

[0007] In one embodiment, the second radiation floor is connected with a plurality of the metallized holes, and the plurality of the metallized holes are arranged in a circle along an edge of the second radiation floor.

[0008] In one embodiment, the first radiation floor and the second radiation floor are respectively rectangular.

[0009] In one embodiment, when projected along the thickness direction of the substrate, all areas of the two second radiation floors are located within the projection area of ​​the first radiation floor.

[0010] In one embodiment, the width of the transmission line is 1.3 mm, the length of the transmission line is 12 mm, the gap between the transmission line and the second radiation floor is 0.25 mm; and the radius of the radiation branch is 15 mm.

[0011] In one embodiment, the length of the substrate is 32.8 mm, the width of the substrate is 32.8 mm, and the thickness of the substrate is 1.2 mm; the dielectric constant of the substrate is 4.3, and the loss tangent value is 0.025.

[0012] In order to solve the above technical problems, the second technical solution adopted by the present invention is: a shark fin antenna device, including the above-mentioned vehicle-mounted omnidirectional ultra-wideband antenna.

[0013] The beneficial effects of the utility model are:

[0014] This vehicle-mounted omnidirectional ultra-wideband antenna has a small and compact structure and good full radiation efficiency. It is particularly suitable for placement in a shark fin antenna device. This vehicle-mounted omnidirectional ultra-wideband antenna can effectively cover the bandwidth of 2.4GHz to 10.5GHz, and can achieve coverage of the BLE / WALN / UWB antenna frequency band, so that the number of antennas in the shark fin antenna device can be reduced, which is beneficial to improving the overall performance of the shark fin antenna device.

[0015] The vehicle-mounted omnidirectional ultra-wideband antenna can be processed and formed by a circuit board processing technology, and thus has the advantages of being easy to produce and having a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the internal structure of the shark fin antenna device according to the first embodiment of the present utility model;

[0018] Figure 2 This is a front view of the vehicle-mounted omnidirectional ultra-wideband antenna according to the first embodiment of the utility model;

[0019] Figure 3 This is a rear view of the vehicle-mounted omnidirectional ultra-wideband antenna according to the first embodiment of the utility model;

[0020] Figure 4 This is a simulated S-parameter diagram of the vehicle-mounted omnidirectional ultra-wideband antenna according to the first embodiment of the utility model;

[0021] Figure 5 This is a simulation efficiency diagram of the vehicle-mounted omnidirectional ultra-wideband antenna according to the first embodiment of the utility model;

[0022] Figure 6The radiation pattern of the vehicle-mounted omnidirectional ultra-wideband antenna of Embodiment 1 of the utility model when operating at 6.5 GHz;

[0023] Figure 7 The radiation pattern of the vehicle-mounted omnidirectional ultra-wideband antenna of Embodiment 1 of the utility model when operating at 7.5 GHz;

[0024] Figure 8 The radiation pattern of the vehicle-mounted omnidirectional ultra-wideband antenna of the first embodiment of the utility model when operating at 8.5 GHz;

[0025] Fig. 9 This is the radiation pattern of the vehicle-mounted omnidirectional ultra-wideband antenna of Example 1 of the utility model when operating at 10.5 GHz.

[0026] Description of Figure Numbers:

[0027] 1. Substrate;

[0028] 2. The first radiant floor;

[0029] 3. Radiating branches;

[0030] 4. Transmission line;

[0031] 5. Second radiant floor;

[0032] 6. Metallized holes;

[0033] 10. Vehicle-mounted omnidirectional ultra-wideband antenna. DETAILED DESCRIPTION

[0034] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0038] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Embodiment 1

[0041] Please refer to Figures 1 to 9 , Embodiment 1 of the present utility model is: Figure 1 As shown, a vehicle-mounted omnidirectional ultra-wideband antenna 10 can be applied to a shark fin antenna device.

[0042] like Figure 2 and Figure 3 As shown, the vehicle-mounted omnidirectional ultra-wideband antenna 10 includes a substrate 1, a first radiation floor 2 is provided on the back of the substrate 1, a radiation branch 3, a transmission line 4 and a second radiation floor 5 are provided on the front of the substrate 1, one end of the transmission line 4 is connected to the radiation branch 3, and the second radiation floor 5 is provided on both sides of the transmission line 4, the second radiation floor 5 is electrically connected to the first radiation floor 2, and the radiation branch 3 is circular as a whole.

[0043] In this embodiment, the vehicle-mounted omnidirectional ultra-wideband antenna 10 is a bilaterally symmetrical structure, that is, the extension line of the central axis of the transmission line 4 passes through the center of the radiation branch 3, and the two second radiation floors 5 are symmetrical about the central axis of the transmission line 4.

[0044] For the convenience of processing and production, optionally, the second radiant floor 5 is electrically connected to the first radiant floor 2 through the metallized hole 6. Preferably, the second radiant floor 5 is connected with a plurality of the metallized holes 6, and the plurality of the metallized holes 6 are arranged in a circle along the edge of the second radiant floor 5, so that the external signal interference on the transmission line 4 can be reduced to a greater extent.

[0045] Optionally, the first radiant floor 2 and the second radiant floor 5 are rectangular in shape. Preferably, when projected along the thickness direction of the substrate 1 , all areas of the two second radiant floors 5 are located within the projection area of ​​the first radiant floor 2 .

[0046] Preferably, the radiation branches 3, the first radiation floor 2, the second radiation floor 5 and the transmission line 4 are all printed on the substrate 1. Optionally, the substrate 1 is a FR-4 dielectric substrate, that is, the vehicle-mounted omnidirectional ultra-wideband antenna 10 can be a PCBA circuit board, which can effectively control the manufacturing cost of the vehicle-mounted omnidirectional ultra-wideband antenna 10.

[0047] In this embodiment, the length of the substrate is 32.8 mm, the width is 32.8 mm, the thickness is 1.2 mm, and the dielectric constant ε r =4.3, loss tangent value tanδ=0.025. It can be seen that the substrate occupies a small space, ensuring that the vehicle-mounted omnidirectional ultra-wideband antenna can be miniaturized, so that it can effectively adapt to the installation environment of the vehicle shark fin antenna device. The width of the transmission line is 1.3mm, the length of the transmission line is 12mm, and the gap between the transmission line and the second radiation floor is 0.25mm. The use of GCPW transmission line structure feeding can increase the bandwidth. The transmission line of the above size can match the impedance to 50Ω to achieve better radiation effect; the radius of the radiation branch is 15mm, and the first radiation floor is used as a local ground structure to reduce the coupling effect between the vehicle-mounted omnidirectional ultra-wideband antenna and other antenna units in the shark fin antenna device, thereby improving the isolation performance between antennas.

[0048] Figure 4 is a simulated S parameter diagram of the vehicle-mounted omnidirectional ultra-wideband antenna of this embodiment, Figure 4 It can be seen that the return loss of the vehicle-mounted omnidirectional ultra-wideband antenna is less than -6dB, and the vehicle-mounted omnidirectional ultra-wideband antenna can effectively cover the ultra-wideband communication frequency band from 2.4GHz to 10.5GHz.

[0049] Figure 5 is a simulation efficiency diagram of the vehicle-mounted omnidirectional ultra-wideband antenna of this embodiment, Figure 5 It can be seen that the full radiation efficiency of the vehicle-mounted omnidirectional ultra-wideband antenna from 2.4GHz to 10.5GHz can reach over 75%, and the vehicle-mounted omnidirectional ultra-wideband antenna has good performance in communication.

[0050] Figures 6 to 9 are the directional diagrams of the vehicle-mounted omnidirectional ultra-wideband antenna of this embodiment, such as Figures 6 to 9 As shown in the figure, the vehicle-mounted omnidirectional ultra-wideband antenna is an omnidirectional antenna at 6.5GHz, 7.5GHz, 8.5GHz, and 10.5GHz, and its gain can reach 4.6dBi, 5.2dBi, 5.6dBi, and 4.9dBi respectively. It can be seen that the vehicle-mounted omnidirectional ultra-wideband antenna has good omnidirectionality in the working frequency band.

[0051] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A vehicle-mounted omnidirectional ultra-wideband antenna, characterized in that: It includes a substrate, a first radiation floor is provided on the back side of the substrate, a radiation branch, a transmission line and a second radiation floor are provided on the front side of the substrate, one end of the transmission line is connected to the radiation branch, the second radiation floor is provided on both sides of the transmission line, the second radiation floor is electrically connected to the first radiation floor, and the radiation branch is circular as a whole.

2. The vehicle-mounted omnidirectional ultra-wideband antenna according to claim 1, characterized in that: The vehicle-mounted omnidirectional ultra-wideband antenna has a bilaterally symmetrical structure.

3. The vehicle-mounted omnidirectional ultra-wideband antenna according to claim 1, characterized in that: The second radiation floor is electrically connected to the first radiation floor through a metallized hole.

4. The vehicle-mounted omnidirectional ultra-wideband antenna according to claim 3, characterized in that: The second radiation floor is connected with a plurality of the metallized holes, and the plurality of the metallized holes are arranged in a circle along the edge of the second radiation floor.

5. The vehicle-mounted omnidirectional ultra-wideband antenna according to claim 1, characterized in that: The first radiation floor and the second radiation floor are respectively rectangular.

6. The vehicle-mounted omnidirectional ultra-wideband antenna according to claim 5, characterized in that: Projected along the thickness direction of the substrate, all areas of the two second radiation floors are located within the projection area of ​​the first radiation floor.

7. The vehicle-mounted omnidirectional ultra-wideband antenna according to claim 1, characterized in that: The width of the transmission line is 1.3 mm, the length of the transmission line is 12 mm, the gap between the transmission line and the second radiation floor is 0.25 mm; and the radius of the radiation branch is 15 mm.

8. The vehicle-mounted omnidirectional ultra-wideband antenna according to claim 7, characterized in that: The length of the substrate is 32.8 mm, the width of the substrate is 32.8 mm, and the thickness of the substrate is 1.2 mm; the dielectric constant of the substrate is 4.3, and the loss tangent value is 0.

025.

9. A shark fin antenna device, characterized in that: The vehicle-mounted omnidirectional ultra-wideband antenna comprises any one of claims 1-8.

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