High-gain antenna

Abstract

The utility model provides a high-gain antenna, and belongs to the technical field of antennas. The high-gain antenna comprises a reflecting plate; the two log-periodic antennas are symmetrically arranged relative to the middle vertical plane of the reflecting plate, each log-periodic antenna is provided with a plurality of oscillators, and each log-periodic antenna is provided with a first end provided with the shortest oscillator and a second end provided with the longest oscillator; the second end of each log-periodic antenna is connected to the reflecting plate, and the distance between the first ends of the two log-periodic antennas is smaller than the distance between the second ends of the two log-periodic antennas; the power divider is provided with a first input end and two first output ends, and the two first output ends are respectively connected with the two log-periodic antennas; and the connector is provided with a second input end and a second output end, and the second output end is connected with the first input end. The antenna provided by the utility model has high gain and realizes the consistency of beam width.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to a high-gain antenna. Background Technology

[0002] With the continuous development of technology, the internet has permeated every aspect of our lives, playing a vital role in work, study, and entertainment. However, in some scenarios, especially in narrow environments such as elevators and tunnels, network signal instability due to poor antenna signal coverage causes great inconvenience to users and also affects the service quality of operators.

[0003] Currently, for antennas used in narrow environments, the beamwidth narrows as the frequency band increases, resulting in unsatisfactory high-frequency coverage in the edge areas of regular, narrow environments. Therefore, how to achieve high gain while maintaining consistent beamwidth across the frequency band has become a pressing technical problem for those skilled in the art. Utility Model Content

[0004] One objective of this invention is to provide a high-gain antenna that achieves consistent beamwidth.

[0005] Another objective of this invention is to facilitate disassembly and assembly and improve application flexibility.

[0006] A further objective of this invention is to improve intermodulation indices.

[0007] An embodiment of this utility model provides a high-gain antenna, comprising:

[0008] Reflector;

[0009] Two log-periodic antennas are arranged symmetrically with respect to the vertical plane of the reflector. Each log-periodic antenna has multiple elements. Each log-periodic antenna has a first end with the shortest element and a second end with the longest element. The second end of each log-periodic antenna is connected to the reflector. The distance between the first ends of the two log-periodic antennas is less than the distance between the second ends.

[0010] The power divider has a first input terminal and two first output terminals, and the two first output terminals are respectively connected to the two log-periodic antennas;

[0011] The connector has a second input terminal and a second output terminal, the second output terminal being connected to the first input terminal.

[0012] Optionally, each of the log-periodic antennas comprises a coaxial cable and two antenna frames, an outer conductor of the coaxial cable is fixed at one of the antenna frames, an inner conductor of the coaxial cable is connected with the other antenna frame, and each of the antenna frames is independently fixed at the reflecting plate.

[0013] Optionally, each of the antenna frames comprises a support rod and a plurality of the dipoles located on both sides of the support rod, one end of the support rod is provided with a support plate parallel to the reflecting plate, and the support plate is fixedly connected with the reflecting plate.

[0014] Optionally, an insulating plate is further arranged between the support plate and the reflecting plate, and the support plate and the insulating plate are conductively connected with the reflecting plate through fasteners.

[0015] Optionally, the support rod of the antenna frame connected with the inner conductor of the coaxial cable is provided with a connecting plate at an end away from the reflecting plate, and the connecting plate is connected with the inner conductor.

[0016] Optionally, the coaxial cable comprises an insulating outer layer, a plurality of exposure openings are arranged at the insulating outer layer, and the outer conductor is exposed through the exposure openings and welded to the antenna frame.

[0017] Optionally, the high-gain antenna further comprises insulating reinforcing plates clamped on both sides of the length direction of the dipoles of the two log-periodic antennas, at least one through hole is arranged on each of the two sides of the insulating reinforcing plate for clamping the dipole, and the two insulating reinforcing plates are connected through fasteners.

[0018] Optionally, the insulating reinforcing plates are arranged close to the second end.

[0019] Optionally, the power divider is a microstrip power divider and is fixed to one side of the reflecting plate connected with the log-periodic antennas.

[0020] Optionally, a ratio of the longest distance and the shortest distance between the two log-periodic antennas is set according to a ratio of the maximum frequency and the minimum frequency of the target working band.

[0021] According to the first aspect of the utility model, the output end of the power divider is connected with the two log-periodic antennas arranged in the form of gradually decreasing distance according to the two log-periodic antennas arranged in a symmetrical manner, so that the wideband operation with high gain can be realized, and the consistency of the beam width is realized.

[0022] Further, each of the antenna frames is independently detachably mounted at the reflecting plate, so that the distance between the two log-periodic antennas can be conveniently adjusted, the assembly and disassembly are convenient, and the application is flexible.

[0023] Further, the antenna frame is stably connected to the reflecting plate by arranging the support plate at the support rod, and the mutual interference index is improved by arranging the insulating plate to make the antenna frame and the reflecting plate conductive through the fastener, so that the communication signal quality and performance are ensured.

[0024] Further, the structure stability is ensured by arranging the insulating reinforcing plates at the extending ends of the two log-periodic antennas. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of a high-gain antenna according to an embodiment of the present application;

[0026] Figure 2 is a structural schematic diagram of a high-gain antenna according to an embodiment of the present application;

[0027] Figure 3 is a gain pattern of a high-gain antenna according to an embodiment of the present application;

[0028] Figure 4 is a structural schematic diagram of an antenna frame of a high-gain antenna according to an embodiment of the present application;

[0029] Reference signs:

[0030] 100-high-gain antenna, 10-reflecting plate, 20-log-periodic antenna, 21-coaxial cable, 211-insulating outer layer, 201-exposed port, 212-outer conductor, 213-inner conductor, 22-antenna frame, 221-vibrator, 222-support rod, 223-support plate, 224-connection plate, 30-power divider, 31-first input end, 32-first output end, 40-insulating reinforcing plate, 50-fastener. DETAILED DESCRIPTION

[0031] To make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0032] It is to be understood that when a component is referred to as being "on" or "disposed on" another component, it can be directly on the other component or intervening components can also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used in the description herein are for illustrative purposes only and do not indicate the only orientation of the embodiments.

[0033] In addition, the terms "first", "second", etc. are used herein only to describe various conditions, and are not to be construed as indicating relative importance or a specific order of the features so indicated. Thus, a feature defined with "first", "second", etc. can include at least one of the features so defined, either explicitly or implicitly. In the description of the application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above" and "over" of a first feature to a second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above" and "over" of a first feature to a second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. The "under", "below" and "under" of a first feature to a second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0036] Figure 1 is a structural schematic diagram of a high-gain antenna 100 according to an embodiment of the present application. Figure 2 is a side structural schematic diagram of a high-gain antenna 100 according to an embodiment of the present application. As shown in Figure 1As shown, in one embodiment, the high-gain antenna 100 comprises a reflector plate 10, two log-periodic antennas 20, a power divider 30 and a connector (not shown). The reflector plate 10 can be a conventional metal reflector plate. The two log-periodic antennas 20 are symmetrically arranged with respect to the median plane of the reflector plate 10, each of the log-periodic antennas 20 is provided with a plurality of dipoles 221, each of the log-periodic antennas 20 has a first end provided with the shortest dipole 221 and a second end provided with the longest dipole 221, the second end of each of the log-periodic antennas 20 is connected to the reflector plate 10, and the distance between the first ends of the two log-periodic antennas 20 is less than the distance between the second ends. The lengths and intervals of the dipoles 221 of the log-periodic antennas 20 are arranged according to the lengths and intervals of the dipoles 221 of the conventional log-periodic antennas 20, and are arranged according to a certain scale factor. The power divider 30 has a first input end 31 and two first output ends 32 (i.e. a one-to-two equal-amplitude in-phase power divider), and the two first output ends 32 are connected to the two log-periodic antennas 20 respectively. The connector has a second input end and a second output end, and the second output end is connected to the first input end 31. In one embodiment, the power divider 30 is a microstrip power divider, which can be fixed to one side of the reflector plate 10 and connected to the log-periodic antennas 20. The microstrip power divider is simple to manufacture, has high repeatability, and has good isolation and low insertion loss. The connector can be a commonly used connector such as an N-type connector, an SMA connector or a BNC connector. The connector can be arranged at the reflector plate 10, so that the second input end and the second output end are located on the two sides of the reflector plate 10 respectively, facilitating connection.

[0037] The two log-periodic antennas 20 arranged symmetrically and gradually decreasing in interval, and the output end of the power divider 30 connected to the two log-periodic antennas 20, can realize wideband operation with high gain and consistent beam width.

[0038] The ratio of the longest interval L1 to the shortest interval L2 between the two log-periodic antennas 20 of the high-gain antenna 100 of the above embodiment is set to be equal to the ratio of the maximum frequency to the minimum frequency of the target operating band. For example, if the high-gain antenna 100 is required to realize an operating band of A-B, then L1 / L2 is set to be equal to B / A. According to different requirements of the operating band, the ratio of the longest interval L1 to the shortest interval L2 can be set accordingly.

[0039] In one embodiment, the dipoles 221 are straight-line dipoles, the length of the longest straight-line dipole is 37 mm, the length of the shortest straight-line dipole is 5 mm, and the ratio of the longest interval L1 to the shortest interval L2 is 2.1, which can realize a wideband operating band of 1710-3600 MHz (relative bandwidth of 71%). Figure 3The gain pattern of the high-gain antenna 100 of the present embodiment includes the gain patterns at 1710 MHz (low frequency), 2655 MHz (medium frequency), and 3600 MHz (high frequency). According to the present embodiment, the gain of the low-frequency operation is 11.05 dB, the 3-dB beam width is 36.37°, the gain of the medium-frequency operation is 11.12 dB, the 3-dB beam width is 35.69°, and the gain of the high-frequency operation is 11.06 dB, the 3-dB beam width is 34.6°. That is, the gain of the antenna of the present embodiment is greater than 11 dB within the frequency band, and the 3-dB beam width is 35°±2°, achieving consistency of high gain and beam width. Figure 3

[0040] Figure 4 Fig. 22 is a structural schematic diagram of the antenna stand 22 of the high-gain antenna 100 according to an embodiment of the present application. In one embodiment, as shown in Fig. 22, each log-periodic antenna 20 includes a coaxial cable 21 and two antenna stands 22. The outer conductor 212 of the coaxial cable 21 is fixed at one antenna stand 22, and the inner conductor 213 of the coaxial cable 21 is connected to the other antenna stand 22. Each antenna stand 22 is independently fixed to the reflecting plate 10. As shown in Fig. 23, each antenna stand 22 includes a support rod 222 and a plurality of dipoles 221 on both sides of the support rod 222. One end of the support rod 222 is provided with a support plate 223 parallel to the reflecting plate 10, and the support plate 223 is fixedly connected to the reflecting plate 10. In one embodiment, an insulating plate is further provided between the support plate 223 and the reflecting plate 10, and the support plate 223 and the insulating plate are conductively connected to the reflecting plate 10 by fasteners. As shown in Fig. 24, the support rod 222 of the antenna stand 22 connected to the inner conductor 213 of the coaxial cable 21 is provided with a connecting plate 224 at the end away from the reflecting plate 10, and the connecting plate 224 is connected to the inner conductor 213. The coaxial cable 21 includes an insulating outer layer, and a plurality of exposure openings 201 are provided on the insulating outer layer for exposing the outer conductor 212. The outer conductor 212 is welded to the antenna stand 22. Figure 2 Figure 4 Figure 2

[0041] In the present embodiment, each antenna stand 22 is independently detachably mounted to the reflecting plate 10, so that the spacing between the two log-periodic antennas 20 can be conveniently adjusted, and the antenna is easy to disassemble and flexible to apply.

[0042] Further, by providing the support plate 223 at the support rod 222, the antenna stand 22 can be stably connected to the reflecting plate 10. By providing the insulating plate, the antenna stand 22 and the reflecting plate 10 are conductively connected by the fasteners, which improves the intermodulation index and improves the interference suppression capability of the antenna, thereby ensuring the communication signal quality and performance.

[0043] In a further embodiment, as shown in Fig. 25, the antenna stand 22 includes a support rod 222 and a plurality of dipoles 221 on both sides of the support rod 222.​​​​Figure 2 As shown, the high-gain antenna 100 further comprises two insulating reinforcing plates 40 clamped on the length direction of the two log-periodic antennas 20. Each of the two insulating reinforcing plates 40 is provided with at least one through hole for passing the dipole 221. The two insulating reinforcing plates 40 are connected by a fixing member 50, such as a bolt, screw, rivet, etc. In one embodiment, the insulating reinforcing plates 40 are located close to the second end, i.e. a group of oppositely arranged insulating reinforcing plates 40 are located close to the second end. Of course, the number of insulating reinforcing plates 40 can be more, such as multiple groups arranged in the length direction of the support rod 222, to enhance the structural stability.

[0044] The embodiment can ensure the stability of the structure by arranging the insulating reinforcing plates 40 on the extending end of the two log-periodic antennas 20. Further, the two insulating reinforcing plates 40 are directly connected by the fixing member 50, and the installation process is simplified by directly passing the dipole 221 through the through hole of the insulating reinforcing plate 40.

[0045] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A high gain antenna, characterized by, The utility model relates to a kind of log-periodic antenna, including: Reflective plate; Two log-periodic antennas are symmetrically arranged relative to the median plane of the reflective plate, each of the log-periodic antennas is provided with a plurality of dipoles, each of the log-periodic antennas has a first end provided with the shortest dipole and a second end provided with the longest dipole, the second end of each of the log-periodic antennas is connected to the reflective plate, the distance between the first ends of the two log-periodic antennas is less than the distance between the second ends; A power divider has a first input and two first outputs, and the two first outputs are respectively connected to the two log-periodic antennas; A connector has a second input and a second output, and the second output is connected to the first input.

2. The high-gain antenna of claim 1, wherein, Each of the log-periodic antennas includes a coaxial cable and two antenna supports, the outer conductor of the coaxial cable is fixed to one of the antenna supports, and the inner conductor of the coaxial cable is connected to the other antenna support, and each of the antenna supports is independently fixed to the reflective plate.

3. The high-gain antenna of claim 2, wherein, Each of the antenna supports includes a support rod and a plurality of dipoles located on both sides of the support rod, one end of the support rod is provided with a support plate parallel to the reflective plate, and the support plate is fixedly connected to the reflective plate.

4. The high-gain antenna of claim 3, wherein, An insulating plate is further provided between the support plate and the reflective plate, and the support plate and the insulating plate are conductively connected to the reflective plate by fasteners.

5. The high-gain antenna of claim 3, wherein, The support rod of the antenna support connected to the inner conductor of the coaxial cable is provided with a connecting plate at the end away from the reflective plate, and the connecting plate is connected to the inner conductor.

6. The high-gain antenna of claim 2, wherein, The coaxial cable includes an insulating outer layer, and a plurality of exposure openings are provided on the insulating outer layer for exposing the outer conductor, and the outer conductor is welded to the antenna support.

7. The high-gain antenna of any of claims 1-6, wherein, The utility model further includes insulating reinforcing plates clamped on both sides of the length direction of the dipoles of the two log-periodic antennas, at least one through hole is provided on both sides of each of the insulating reinforcing plates for passing through the dipole, and the two insulating reinforcing plates are connected by a fixing member.

8. The high-gain antenna of claim 7, wherein, The insulating reinforcing plates are located close to the second end.

9. The high-gain antenna of any of claims 1-6, wherein, The power divider is a microstrip power divider and is fixed to one side of the reflective plate connected to the log-periodic antennas.

10. The high-gain antenna of any one of claims 1-6, wherein, The ratio of the longest distance to the shortest distance between the two log-periodic antennas is set according to the ratio of the maximum frequency to the minimum frequency of the target operating band.

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