Directional full-band external dual antenna

Abstract

The utility model belongs to the technical field of antenna, and relates to a directional full -band external dual antenna, including copper clad PCB board, two radiators and two coaxial cables, two radiators are connected respectively at two places of copper clad PCB board's feed point, the bottom end of radiator is set to be used for increasing the gradual change structure of current path through the radiator, realizes the current path from below to above gradually increases, thereby realizes signal frequency band from high frequency to low frequency's coverage, the feed point place is connected with coaxial cable through the feeder, the braided layer of coaxial cable is connected on the copper plate of copper clad PCB board, the inner core of coaxial cable is connected with the feeder. The copper plate on the copper clad PCB board is used as the ground, does not need to add the reflector plate extra and can reflect the electromagnetic wave, makes the antenna have the pointing function, avoids the influence antenna's radiation performance, thereby makes the application can obtain a wider frequency range.

Description

Technical Field

[0001] This utility model relates to the field of antenna technology, and in particular to a directional full-band external dual antenna. Background Technology

[0002] Most conventional monopole antennas lack the capability to achieve an efficiency of ≥40% (based on ANSI C63.10-2013 standard testing, see the example data table for details) in the 617MHz-7200MHz frequency band. They are generally omnidirectional antennas, where energy is uniformly distributed within a 360° range, lacking directional capability. When using methods to achieve antenna directionality by reflecting electromagnetic waves from the ground plane, the metallic ground absorbs the antenna's radiated energy, thus reducing antenna performance. Therefore, this invention proposes a directional full-band external dual antenna. Utility Model Content

[0003] The main objective of this invention is to provide a directional full-band external dual antenna to solve the problems mentioned in the background art.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a directional full-band external dual antenna, comprising a copper-clad PCB board, two radiators, and two coaxial cables. The two radiators are respectively connected to two feed points on the copper-clad PCB board. The bottom end of the radiator is configured with a gradient structure to increase the current path flowing through the radiator. The coaxial cables are connected to the feed points through feed lines. The braided layer of the coaxial cables is connected to the copper plate of the copper-clad PCB board, and the inner core of the coaxial cables is connected to the feed lines.

[0005] Preferably, the radiator is an L-shaped metal sheet with the vertical portion of the L-shaped metal sheet facing downwards, and the gradient structure is an inverted triangle integrally formed at the bottom of the vertical portion of the L-shaped metal sheet with the small end facing downwards.

[0006] Preferably, the two radiators are centrally symmetrically distributed on the upper surface of the copper-clad PCB board, and the horizontal portions of the two radiators are arranged facing each other.

[0007] Preferably, the copper plate of the copper-clad PCB is composed of two copper sheets, with a gap between the two copper sheets forming an isolation strip.

[0008] The beneficial effects of this utility model are as follows: This application can reflect electromagnetic waves without adding an additional reflector, giving the antenna a directional function and avoiding affecting the antenna's radiation performance. The reflected electromagnetic waves can also be used to enhance directional signals, making the signal propagation distance longer. The bottom of the radiator is provided with a gradient structure to increase the current path flowing through the radiator. According to the electromagnetic wave resonance principle (reference: Balanis, Antenna Theory, Chapter 2), the current path length L is inversely proportional to the resonant frequency f (f ∝ 1 / L). The gradient structure 4 increases the path length from 10mm to 120mm, resulting in the frequency band decreasing from 7200MHz to 617MHz, thus enabling this application to obtain a wider frequency band range. Attached Figure Description

[0009] Fig. 1 This is a schematic diagram of a directional full-band external dual-antenna structure for an example.

[0010] Fig. 2 This is an exploded view of a directional full-band external dual antenna.

[0011] The numbers in the diagram represent: 1. Copper-clad PCB; 2. Radiator; 3. Coaxial cable; 4. Gradient structure; 5. L-shaped metal sheet; 6. Copper sheet; 7. Isolation strip; 8. Feeder line. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to specific embodiments.

[0013] Example: like Figs. 1-2 As shown, this utility model discloses a directional full-band external dual antenna, comprising a copper-clad PCB board 1, two radiators 2 (labeled ANT_1 and ANT_2 respectively), and two coaxial cables 3. The two radiators 2 are respectively connected to two feed points on the copper-clad PCB board 1. The bottom end of each radiator 2 is configured with a gradient structure 4 to increase the current path flowing through it, with the current path gradually increasing from bottom to top. The coaxial cables 3 are connected to the feed points via feed lines 8 to match the impedance at the feed points and avoid power loss. The braided layer of the coaxial cables 3 is connected to the copper plate of the copper-clad PCB board 1, and the inner core of the coaxial cables 3 is connected to the feed lines 8 to prevent external signal interference. This application uses the copper plate on the copper-clad PCB board 1 as a ground plane. ，Electromagnetic waves can be reflected without the need for an additional reflector, giving the antenna a directional function and avoiding affecting the antenna's radiation performance. The bottom of the radiator 2 is provided with a gradient structure 4 to increase the current path flowing through the radiator 2, and the current path gradually increases from bottom to top, thereby gradually decreasing the signal frequency band from bottom to top to achieve signal coverage from high frequency to low frequency. This allows the present application to obtain a wider frequency band range. Compared with a single antenna, the dual radiators 2 provide a wider signal coverage when transmitting signals. When receiving signals, the two radiators 2 simultaneously receive one signal, enhancing the signal reception capability.

[0014] The radiator 2 is a phosphor bronze L-shaped metal sheet 5 with a thickness of 0.8 mm, formed by laser cutting, with a bending angle of 90°±2°. The vertical part of the L-shaped metal sheet 5 faces downward. The gradient structure 4 is an inverted triangle with a height of 50 mm, an upper base width of 120 mm, and a lower base width of 10 mm (based on simulation optimization to ensure that the current path increase is ≥30%). The current fed by the feed line enters the radiator 2 and flows along the surface of the radiator 2. When the current advances to the lowest end of the gradient structure 4, the current path is the least, and the signal frequency band at this point covers the highest frequency. As the current continues upward, the current path gradually increases due to the gradually increasing width of the gradient structure 4, covering the lower frequency. This allows the radiator 2 to obtain a wider frequency band range. The bending of the L-shaped metal sheet 5 can reduce the overall height of the radiator 2, thereby reducing the overall volume.

[0015] Two radiators 2 are centrally symmetrically distributed on the upper surface of the copper-clad PCB board 1. The horizontal portions of the two radiators 2 are arranged facing each other. The projections of the two radiators 2 in the horizontal plane do not exceed the upper surface of the copper-clad PCB board 1. While ensuring the three-dimensional structure, the radiators 2 converge towards the center to make the structure more compact.

[0016] The copper plate of the copper-clad PCB board 1 is composed of two copper sheets 6, with a gap between the two copper sheets 6 forming an isolation strip 7 to prevent mutual interference between the two radiators.

[0017] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A directional full-band external dual antenna, characterized in that: The device includes a copper-clad PCB board, two radiators, and two coaxial cables. The two radiators are respectively connected to two feed points on the copper-clad PCB board. The bottom end of the radiator is configured with a gradient structure to increase the current path through the radiator. The coaxial cables are connected to the feed points via feed lines. The braided layer of the coaxial cables is connected to the copper plate of the copper-clad PCB board, and the inner core of the coaxial cables is connected to the feed lines.

2. The directional full-band external dual antenna according to claim 1, characterized in that: The radiator is an L-shaped metal sheet with its vertical portion facing downwards, and the gradient structure is an inverted triangle integrally formed at the bottom of the vertical portion of the L-shaped metal sheet.

3. A directional full-band external dual antenna according to claim 2, characterized in that: The two radiators are centrally symmetrically distributed on the upper surface of the copper-clad PCB board, with the horizontal portions of the two radiators facing each other.

4. A directional full-band external dual antenna according to claim 1, characterized in that: The copper plate of the copper-clad PCB is composed of two copper sheets, with a gap between the two copper sheets forming an isolation strip.

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