A VLF broadband antenna

Abstract

This utility model discloses a VLF broadband antenna, belonging to the field of very low frequency electromagnetic field monitoring. It includes a first PCB board and a second PCB board arranged vertically opposite each other, with several conductive support components disposed between them. One of the PCB boards has an output port. Each conductive support component includes a bracket vertically disposed between the first and second PCB boards. Multiple sets of coils are disposed inside the bracket. The coils employ a double-shielded structure, and the coils used for detecting electric fields and those used for detecting magnetic fields are arranged perpendicularly to each other. The double-shielded structure includes a copper foil shielding layer and a metal bracket shielding layer. The coils use single-strand silver-plated ribbon cables. This VLF broadband antenna, by employing high-Q, low-loss coils combined with high-Q materials, can more accurately capture electromagnetic field signals, providing more effective data for backend data processing and meeting the requirements of high-precision monitoring.

Description

Technical Field

[0001] This utility model relates to the field of very low frequency electromagnetic field monitoring technology, and in particular to a VLF broadband antenna. Background Technology

[0002] In the field of very low frequency (VLF: 5–400 kHz) electromagnetic field monitoring, especially in high-precision monitoring scenarios of lightning electromagnetic fields, traditional VLF antennas (such as loop antennas, ferrite rod antennas, etc.) have many insurmountable shortcomings:

[0003] First, traditional antennas generally suffer from low sensitivity, making it difficult to accurately capture weak electromagnetic field changes. Second, they have weak anti-interference capabilities and are easily affected by external electromagnetic interference, leading to a decrease in the effectiveness of monitoring data. Finally, they are large in size and have poor adaptability in application scenarios with strict limitations on installation space. Utility Model Content

[0004] The purpose of this invention is to provide a VLF broadband antenna to address the problem that existing VLF antennas cannot meet the requirements of high-precision monitoring and cannot provide sufficient and effective data for back-end data processing.

[0005] To achieve the above objectives, the present invention employs the following technology: a VLF broadband antenna, comprising a first PCB board and a second PCB board arranged vertically opposite each other, wherein a plurality of conductive support components are provided between the first PCB board and the second PCB board, and an output port is provided on one of the PCB boards.

[0006] The conductive support assembly includes a bracket vertically disposed between the first PCB board and the second PCB board. Multiple sets of coils are disposed inside the bracket. The coils adopt a double-shielded structure, and the coils used to detect the electric field and the coils used to detect the magnetic field are arranged perpendicularly to each other.

[0007] As a further description of the above technical solution: the double shielding structure includes a copper foil shielding layer and a metal support shielding layer.

[0008] As a further description of the above technical solution: the coil adopts a single-strand silver-plated ribbon cable.

[0009] As a further description of the above technical solution: the coil is a 10-strand 0.9m low-loss high-Q wire.

[0010] As a further description of the above technical solution: the coil includes an electric field coil and a magnetic field coil, which are arranged perpendicularly to each other.

[0011] As a further description of the above technical solution: the antenna operates in the frequency range of 5kHz to 400kHz.

[0012] As a further description of the above technical solution: the output ports constitute six sets of outputs, including two electric field output ports, two magnetic field output ports, and two self-test output ports.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0014] By employing a high-Q, low-loss coil and combining it with high-Q materials, the antenna exhibits high sensitivity to very low frequency (5–400 kHz) electromagnetic field changes, enabling it to capture electromagnetic field signals more accurately and provide more effective data for back-end data processing, thus meeting the requirements for high-precision monitoring.

[0015] The coil adopts a double-shielded structure, which can effectively reduce external electromagnetic interference. At the same time, the electric field and magnetic field coils are set perpendicularly to each other, which further improves the anti-interference performance and ensures the stability and reliability of the signal.

[0016] Compared to the original model, its size is greatly reduced, making it easier to install and use in space-constrained scenarios and improving application flexibility. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure according to an embodiment of the present utility model is shown. Figure 1 ;

[0018] Figure 2 A schematic diagram of the overall structure according to an embodiment of the present utility model is shown. Figure 2 ;

[0019] Figure 3 A top view according to an embodiment of the present invention is shown;

[0020] Figure 4 A bottom view according to an embodiment of the present invention is shown.

[0021] Legend:

[0022] 1. First PCB board; 2. Second PCB board; 3. Conductive support assembly; 4. Output port. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figures 1-4 This embodiment provides a VLF broadband antenna, including a first PCB board 1 and a second PCB board 2 arranged vertically opposite each other. A plurality of conductive support components 3 are arranged between the first PCB board 1 and the second PCB board 2. One of the PCB boards is provided with an output port 4. The conductive support component 3 includes a bracket vertically arranged between the first PCB board 1 and the second PCB board 2. Multiple sets of coils are arranged inside the bracket. Among them, the coil used for detecting electric field and the coil used for detecting magnetic field are arranged perpendicularly to each other.

[0025] In this invention, the antenna operates in a frequency range of 5kHz to 400kHz. When in a very low frequency electromagnetic field environment of 5 to 400kHz, multiple coils inside the conductive support component 3 will couple with the electromagnetic field. The coil used to detect the electric field will sense changes in the electric field in space, and the coil used to detect the magnetic field will sense changes in the magnetic field in space. The coils include electric field coils and magnetic field coils, which are arranged perpendicularly to each other. Because the electric field coils and magnetic field coils are arranged perpendicularly to each other, they can capture electromagnetic field components in different directions. The induced electrical signal is transmitted through the coil to the PCB board with an output port 4. Finally, the processed signal is output to the back-end equipment for analysis and processing through the output port 4. The first PCB board 1 and the second PCB board 2 serve as the upper and lower bases of the antenna, providing stable support for the entire structure. At the same time, the conductive support component 3 not only provides support but also provides a shielding environment for the coils and conducts signals.

[0026] It should be noted that the coil adopts a double-shielded structure, which includes a copper foil shielding layer and a metal support shielding layer. The copper foil shielding layer can effectively block most high-frequency electromagnetic interference, while the metal support shielding layer can further attenuate and reduce interference signals in the low-frequency, very low-frequency, very low-frequency, and very low-frequency bands. The two work together to form a three-dimensional shielding barrier, which significantly reduces the interference of the external electromagnetic environment on the coil's induced signal and ensures that the electromagnetic field signal captured by the coil is purer.

[0027] Specifically, the coil uses a single-strand silver-plated ribbon cable, and the coil itself is made of 10 strands of 0.9m low-loss, high-Q wire. The silver plating layer has excellent conductivity, which can reduce resistance loss during current transmission, reduce signal attenuation in the ribbon cable, and ensure that the weak electromagnetic field signal induced by the coil can be transmitted to output port 4 more completely. At the same time, silver has high chemical stability, which can improve the corrosion resistance of the ribbon cable, extend the service life of the coil, and ensure the long-term stability of the antenna.

[0028] The coil formed by combining 10 strands of wire can increase the equivalent cross-sectional area of ​​the conductor, reduce the loss caused by the skin effect under the same current, improve the coil's induction efficiency for very low frequency (5-400kHz) signals, enhance the overall sensitivity of the antenna, and the low-loss wire can minimize the energy loss of the signal when it is transmitted inside the coil, ensuring that the induced electromagnetic field signal is transmitted to the output terminal 4 with a higher intensity, and retaining more effective signal components for back-end data processing.

[0029] Specifically, output port 4 comprises six outputs, including two electric field output ports, two magnetic field output ports, and two self-test output ports. The two self-test output ports can monitor the antenna's operating status in real time, such as the coil's induction performance and the effectiveness of the shielding structure. The self-test signals can promptly detect antenna faults, facilitating rapid problem diagnosis, ensuring long-term stable antenna operation, and reducing maintenance costs.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A VLF broadband antenna, characterized by, It includes a first PCB board (1) and a second PCB board (2) arranged vertically opposite each other. A plurality of conductive support components (3) are arranged between the first PCB board (1) and the second PCB board (2), and an output port (4) is provided on one of the PCB boards. The conductive support assembly (3) includes a bracket vertically arranged between the first PCB board (1) and the second PCB board (2). The bracket has multiple sets of coils inside, wherein the coils adopt a double shielding structure, and the coils used to detect the electric field and the coils used to detect the magnetic field are arranged perpendicularly to each other.

2. A VLF broadband antenna according to claim 1, characterised in that, The dual-shielding structure includes a copper foil shielding layer and a metal support shielding layer.

3. A VLF broadband antenna according to claim 2, characterized in that, The coil uses a single-strand silver-plated ribbon cable.

4. A VLF broadband antenna according to claim 3, characterized in that, The coil is made of 10 strands of 0.9m low-loss, high-Q wire.

5. A VLF broadband antenna according to claim 4, characterized in that, The coil includes an electric field coil and a magnetic field coil, which are arranged perpendicularly to each other.

6. A VLF broadband antenna according to claim 1, characterized in that, The antenna operates in the frequency range of 5kHz to 400kHz.

7. A VLF broadband antenna according to claim 1, characterized in that, The output port (4) constitutes six sets of outputs, including two electric field output ports, two magnetic field output ports and two self-test output ports.

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