A planar shield based on a wireless network of a park and a shielding device

Abstract

This invention relates to a planar shield and shielding device based on a campus wireless network. The device includes a planar shield, an RF module, a control unit, and a power supply system. The planar shield has a central through-hole on its substrate, a power feed patch on the back, and a parasitic patch group consisting of a central fan-shaped parasitic patch and multiple concentric fan-ring parasitic patches on the front. Some of the concentric fan-ring parasitic patches are composed of spaced sub-patterns. The RF module is connected to the planar shield to generate and process electromagnetic wave signals. The control unit controls the operating state of the RF module, and the power supply system provides power. The signal generated by the signal source module excites electromagnetic waves that interact with the parasitic patches through the through-hole. Changing the spacing can change the antenna characteristics, adapting to different locations and scenarios in the campus, achieving directional shielding, and reducing interference.

Description

Technical Field

[0001] This utility model relates to the field of electronic shielding technology, specifically to a planar shielding device and shielding apparatus based on a campus wireless network. Background Technology

[0002] With the rapid development of wireless communication technology, wireless networks are being used more and more widely in industrial parks. However, the openness of wireless networks also brings certain security risks, such as information leakage and illegal intrusion. Electronic shielding fences for industrial park wireless networks are professional devices designed to accurately block wireless signals within the park to ensure the security of the park's information and network. They interfere with unauthorized access to the park's network by emitting specific wireless signals.

[0003] Existing technologies primarily employ two types of shielding: traditional full-band, full-area coverage jammers and simple directional antenna shielding systems. Traditional full-band, full-area coverage jammers, centered around an omnidirectional antenna, signal generator, and power amplifier module, indiscriminately block all wireless signals within a target area by emitting high-intensity, broad-spectrum interference signals, thus achieving comprehensive coverage. Simple directional antenna shielding systems, on the other hand, utilize ordinary directional antennas and basic signal generators, providing only coarse signal shielding in a fixed direction.

[0004] Given the many shortcomings of existing wireless signal shielding technologies in industrial parks, there is an urgent need to develop a new type of shielding device that can adapt to the complex spatial environment of industrial parks. Utility Model Content

[0005] In view of the defects and problems of existing technologies, this utility model aims to provide a planar jammer and jamming device based on campus wireless network, so as to achieve accurate jamming of wireless signals in the campus, improve the jamming effect, directional control and scene adaptability, and ensure the information security of campus and other places.

[0006] The solution to the technical problem of this utility model is as follows: a planar shield based on a campus wireless network is adopted, including a substrate, a power supply patch, and a parasitic patch group; the substrate has a signal transmission hole, the power supply patch is disposed on the back of the substrate and connected to the power supply signal line; the parasitic patch group is disposed on the front of the substrate, and the parasitic patch group includes a central fan-shaped parasitic patch and concentric fan-ring parasitic patches; outside the central fan-shaped parasitic patch, there is at least one layer of concentric fan-ring parasitic patches, the concentric fan-ring parasitic patches include combined fan-ring parasitic patches, the combined fan-ring parasitic patches are composed of multiple sub-patterns arranged at intervals along a ring, there is a spacing e between the sub-patterns in the same layer, and there is a spacing d between adjacent concentric fan-ring parasitic patches.

[0007] Furthermore, the concentric fan ring parasitic patch also includes an outermost integrated fan ring parasitic patch, which is located outside all the combined fan ring parasitic patches.

[0008] Furthermore, the central sector parasitic patch is a sector patch fixed at the center of the front side of the substrate, and the central angle of the sector is equal to the central angle of the concentric sector parasitic patches of each layer.

[0009] Furthermore, the central angle is any angle between 90 and 270 degrees.

[0010] A shielding device based on a campus wireless network is also adopted, including the aforementioned planar shield, as well as a radio frequency module, a control unit, and a power supply system. The radio frequency module's signal input terminal is connected to the feed signal line of the planar shield to generate electromagnetic wave signals; the control unit is connected to the control terminal of the radio frequency module to control the module's operating state; and the power supply system provides stable power support for the entire device.

[0011] Furthermore, the radio frequency module includes a signal source generation module, a power amplifier module, a filter, and a modulator. The output terminal of the signal source generation module is connected to the input terminal of the power amplifier module. The output terminal of the power amplifier module is connected in series with the filter and then connected to the input terminal of the modulator. The output terminal of the modulator is connected to the feed signal line. The control unit controls the signal source generation module. The high-frequency current output by the signal source generation module is transmitted to the feed patch through the power amplifier module, the filter, the modulator, and the feed network, causing alternating current and electric field to be generated on the patch, thereby exciting electromagnetic waves.

[0012] The beneficial effects of this utility model are:

[0013] 1. Precise Wireless Signal Shielding: The planar shield employs a unique parasitic patch group design, enabling precise shielding of wireless signals within the park. When the feed patch generates alternating current and electric field, thus exciting electromagnetic waves, these waves pass through the signal transmission aperture and interact with the central sector-shaped parasitic patch via electromagnetic coupling. Current and voltage are induced at the sector edge of the central sector-shaped patch, subsequently interacting with adjacent concentric sector rings and multiple sub-patches. The central sector-shaped parasitic patch and the parasitic patches of multiple concentric sector rings simultaneously participate in the antenna's radiation process. By changing the spacing, the antenna's radiation pattern, bandwidth, and impedance characteristics are altered. By arranging the spacing, position, and angle of each sub-pattern, wireless signals in specific frequency bands can be effectively shielded, while reducing interference with signals in non-target frequency bands, improving the flexibility and accuracy of shielding. It can better adapt to the wireless signal shielding needs of different locations and scenarios within the park, achieving directional shielding of specific areas and avoiding unnecessary interference to other areas.

[0014] 2. Compared with traditional omnidirectional coverage shielding methods, this solution can meet the wireless signal shielding needs in different scenarios within the park through precise frequency matching, power adjustment and modulation mode selection, while not affecting the normal use of legitimate internal equipment. Attached Figure Description

[0015] Figure 1 This is a perspective view of the planar shielding device of this utility model;

[0016] Figure 2 yes Figure 1 Assembly relationship diagram;

[0017] Figure 3 yes Figure 1 The front view;

[0018] Figure 4 yes Figure 1 Rear view;

[0019] Figure 5 This is a system relationship diagram of the planar shield of this utility model;

[0020] Figure 6 This is a schematic diagram of the voltage intensity distribution of the planar shield of this utility model;

[0021] Figure 7 This is a schematic diagram of the voltage distribution density and current direction of the planar shield of this utility model;

[0022] Figure 8 This is a schematic diagram of the current distribution density and current direction of the planar shield of this utility model.

[0023] The following labels are used in the diagram: Planar shield 10; bracket 20; RF module 30; control unit 40; power system 50; substrate 11; central sector parasitic patch 12; combined sector ring parasitic patch 13; integrated sector ring parasitic patch 14; power supply patch 15; power supply signal line 16; patch center hole 17; signal transmission hole 18. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Example 1: A planar shielding device based on a campus wireless network, mainly comprising a substrate 11, a power-feed patch 15, and a parasitic patch group, etc. Figures 1-4As shown, the substrate 11 of the planar shield 10 is made of a low-loss, high-dielectric-constant resin material, such as FR-4 glass fiber epoxy resin board, with a thickness of 1.6mm, ensuring good electromagnetic performance and mechanical support. A circular feed patch 15, made of copper foil with a diameter of 20mm, is fixed at the center of the back of the substrate 11 and is fixed with conductive adhesive to ensure tight adhesion to the substrate and reduce signal transmission loss. The parasitic patch group includes a central fan-shaped parasitic patch 12 and concentric fan-ring parasitic patches (at least one layer of combined fan-ring parasitic patches 13 and an outermost integral fan-ring parasitic patch 14).

[0026] Central sector parasitic patch 12: A central sector parasitic patch 12, made of copper foil, is fixed at the center of the front side of the substrate 11. The central angle of the sector is 120° (or other set angles), and the radius is 12-15mm. It is assembled by adhesive or heat sealing to ensure positional accuracy and stability. A through hole with a diameter of 0-3mm is set in the center of the central sector parasitic patch 12 as the patch center hole 17. Concentric sector parasitic patches: Multiple concentric sector parasitic patches are fixed on the outside of the central sector parasitic patch 12, including at least one layer of combined sector parasitic patches 13 and an outermost integrated sector parasitic patch 14. The radial width of each concentric sector is 5-10mm, and the spacing between adjacent concentric sector rings is d, approximately 1mm. The spacing may be equal or unequal, and the design is optimized according to actual needs.

[0027] Among them, at least one layer of concentric fan-ring parasitic patch is composed of multiple sub-patterns arranged along the ring interval. The concentric fan-ring parasitic patch of this layer is a combined fan-ring parasitic patch 13. There is a spacing e between the sub-patterns in the same layer, which is about 0.5mm. The spacing may be equal or unequal. Precision machining technology is used to ensure the consistency and accuracy of the spacing.

[0028] A through hole with a diameter of 3mm is provided in the center of the substrate 11 as a signal transmission hole 18 to ensure that the high-frequency current generated by the signal source can pass through smoothly and to provide a channel for electromagnetic coupling.

[0029] In practice, the planar shield is first installed in the designated location and the feed signal line is connected. Then, the parameters of the RF module are set through the control unit to generate an electromagnetic wave signal with a frequency of 2.4 GHz and a power of 20 dBm. When the high-frequency current generated by the RF module passes through the feed patch, alternating current and electric field are generated on the patch, thereby exciting electromagnetic waves. The electromagnetic waves pass through the signal transmission aperture and interact with the central fan-shaped parasitic patch, inducing current and voltage at the edge of the fan. They then interact sequentially with adjacent concentric fan-shaped rings and with each other among multiple sub-patches, forming electromagnetic wave radiation in a specific direction, thereby shielding the wireless network signal in the area.

[0030] Example 2: Based on the above-mentioned planar shielding device, the main components include a planar shield 10, a radio frequency module 30, a control unit 40, and a power system 50. These components work in concert to achieve precise shielding of wireless signals within the park, and possess good directional control and adaptability to different scenarios. Figure 5 As shown, the RF module 30 mainly consists of the following parts: A signal source generation module employs a highly stable synthesized signal generator, covering common wireless communication frequency bands, with an output power range of -20dBm to +10dBm, providing a stable signal foundation for subsequent signal processing. A power amplifier amplifies the relatively low-power signal generated by the signal source generation module to a sufficiently high power level, ensuring effective shielding of wireless signals within the campus. A bandpass filter is used, with its passband frequency range designed according to the target shielding frequency band, effectively suppressing harmonics and spurious signals, improving the purity of the shielded signal, and avoiding unnecessary interference to other non-target frequency band wireless signals. A modulator employs digital modulation technology, such as QPSK (Quadruple Phase Shift Keying) modulation, modulating the baseband signal generated by the signal source generation module onto the RF carrier, improving the signal's anti-interference capability and transmission efficiency, while also increasing the complexity of the shielded signal, making it more difficult for the shielded wireless device to recover the original signal.

[0031] The control unit 40 employs a high-performance microcontroller, which, through a preset control program, controls the on / off state of the radio frequency module 30 and the switching of different operating modes to adapt to the wireless signal shielding requirements of different scenarios within the park. The control unit 40 monitors the real-time operating status of key components such as the radio frequency module 30, the planar shield 10, and the power supply network, including parameters such as the temperature, voltage, and current of the power amplifier, and indicators such as the antenna's reflection coefficient and VSWR. Upon detecting any abnormality, an alarm mechanism is immediately triggered, promptly notifying maintenance personnel through flashing indicator lights, audible alarms, or sending alarm information to the remote monitoring center to ensure reliable operation of the device.

[0032] The power supply system 50 adopts a wide voltage input range switching power supply with an input voltage range of AC100V-240V and an output DC voltage of +12V and +5V, respectively, providing stable power support for components such as the RF module 30, the control unit 40, and the planar shield 10.

[0033] Mechanical fixing method: The power supply patch 15 and the parasitic patch group are fixed to the base plate 11 to ensure that the patch position remains stable under the action of external factors such as vibration and wind load, and will not loosen or shift. The base plate 11 of the planar shield 10 can be directly fixed to the device housing with bolts, or fixed to the bracket 20, which is fixed to the wall or column. The bracket can be any fixed bracket or an adjustable angle bracket. The connecting bracket is made of aluminum alloy, which has been precision machined and surface treated to ensure the structural stability and electrical performance of the planar shield 10 during long-term use. The device housing is made of high-strength, corrosion-resistant engineering plastic material, which has good mechanical properties and environmental adaptability, and can withstand harsh weather conditions and external physical impacts, ensuring long-term stable operation of the device in the outdoor environment of the park.

[0034] Modular design: The RF module 30, control unit 40, power system 50, and planar shield 10 are designed as independent modules, connected by standardized interfaces and connectors. This facilitates quick location and replacement of the corresponding module in case of failure. For example, the RF module 30 uses a pluggable connection method, connecting to the power supply network and control unit 40 through dedicated RF connectors and data interfaces, eliminating the need for complex soldering and debugging processes and significantly reducing maintenance time.

[0035] The above scheme is based on the electronic shielding fence protection device of the campus wireless network. The high-frequency current output by the signal source generation module is transmitted to the feed patch through the power amplifier module, filter, modulator and feed network, causing alternating current and electric field to be generated on the patch, thereby exciting electromagnetic waves. The electromagnetic waves pass through the signal transmission aperture and interact with the central sector parasitic patch through electromagnetic coupling. The central sector parasitic patch depends on the electromagnetic field generated by the feed patch, and induces current and voltage at the edge of the sector, which then interacts with adjacent concentric sector rings and multiple sub-patches in sequence. The central sector parasitic patch and the parasitic patches of multiple concentric sector rings participate in the antenna radiation process simultaneously. For different planar shields, the radiation pattern, bandwidth and impedance characteristics of the antenna can be changed by changing the spacing d and e, such as... Figures 6-8 As shown. The above-mentioned electronic shielding fence protection device based on the campus wireless network achieves effective shielding of wireless signals by optimizing key components such as the planar shield 10, radio frequency module 30, power supply network and control unit 40, and has good directional control and adaptability to different scenarios.

[0036] Based on the planar shielding device of Embodiment 1, a complete shielding device is constructed in this embodiment. First, the planar shielding device is installed at a key location within the park, such as on a wall or pillar near the park entrance or a sensitive area, at a height of 4 meters to ensure effective coverage of the target area. The planar shielding device is installed using an adjustable angle bracket made of aluminum alloy. The base plate is fixed to the bracket with bolts, and then the bracket is fixed to the wall or pillar. This installation method allows for easy adjustment of the shielding device's orientation to adapt to different shielding requirements.

[0037] The RF module 30 is mounted close to the planar shield and connected to the feed signal line via a dedicated RF connector. The signal generator module employs a highly stable synthesized signal generator, covering the common 2.4GHz and 5GHz wireless communication bands, with an output power range of -20dBm to +10dBm. The power amplifier amplifies the relatively low-power signal generated by the signal generator module to 30dBm, ensuring effective shielding of wireless signals over a wide area. The filter is a bandpass filter, with its passband frequency range designed according to the target shielding frequency band, effectively suppressing harmonics and spurious signals and improving the purity of the shielded signal. The modulator uses QPSK modulation to modulate the baseband signal generated by the signal generator module onto the RF carrier, improving signal anti-interference capability and transmission efficiency.

[0038] The control unit 40 employs a high-performance microcontroller, installed within the control box of the shielding device, and connected to the radio frequency module via a data interface. Through a preset control program, the control unit can enable and disable the radio frequency module, as well as switch between different operating modes. For example, during daytime working hours, the shield can be set to provide shielding at higher power and with a wider frequency band; at night or during non-working hours, the shielding power can be reduced or the shielding frequency band narrowed to save energy and minimize unnecessary interference to the surrounding environment.

[0039] The power supply system 50 employs a wide-range switching power supply with an input voltage range of AC100V-240V and output DC voltages of +12V and +5V, providing stable power support for components such as the RF module, control unit, and planar shield. The power supply system is installed inside the control box, connected to the mains power supply via a power cord, and is equipped with overload and short-circuit protection functions to ensure the safe operation of the shielding device.

[0040] In practical applications, when it is necessary to shield the wireless network within a campus, the parameters of the radio frequency module, such as frequency, power, and modulation method, are first set through the control unit. Then, the shielding device is activated. The high-frequency current generated by the radio frequency module is transmitted to the feed patch through the feed network, causing alternating current and electric field to be generated on the patch, thereby exciting electromagnetic waves. The electromagnetic waves pass through the signal transmission aperture and interact with the central fan-shaped parasitic patch, inducing current and voltage at the edge of the fan. They then interact sequentially with adjacent concentric fan-shaped rings and with each other among multiple sub-patches, forming electromagnetic wave radiation in a specific direction, thereby shielding the wireless network signal in that area.

[0041] The control unit monitors the operational status of key components such as the RF module, planar shield, and power supply network in real time, including parameters like the power amplifier's temperature, voltage, and current, as well as the antenna's reflection coefficient and VSWR. If any abnormality is detected, such as excessively high power amplifier temperature or an abnormal antenna VSWR, an alarm mechanism is immediately triggered. This is done through indicator light flashing, audible alarms, or sending alarm information to the remote monitoring center, promptly notifying maintenance personnel to handle the situation and ensuring reliable operation of the device.

[0042] In the process of shielding the campus wireless network, by optimizing the parameters and settings of key components such as the planar shield, RF module, power supply network, and control unit, effective shielding of wireless signals was achieved, along with good directional control and adaptability to different scenarios. For example, when shielding a specific area within the campus, precise shielding of that area can be achieved by adjusting the orientation of the planar shield and the parameters of the RF module, while reducing interference to other surrounding areas. Through actual testing and evaluation, this shielding device effectively reduces the security risks of the campus wireless network and ensures the campus's information security.

[0043] The specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model.

Claims

1. A planar shield based on a wireless network of a campus, characterized in that, The system includes a substrate (11), a power supply patch (15), and a parasitic patch group. The substrate has a signal transmission hole (18). The power supply patch (15) is disposed on the back side of the substrate and connected to a power supply signal line (16). The parasitic patch group is disposed on the front side of the substrate. The parasitic patch group includes a central fan-shaped parasitic patch (12) and concentric fan-ring parasitic patches. On the outside of the central fan-shaped parasitic patch (12), there is at least one layer of concentric fan-ring parasitic patches. The concentric fan-ring parasitic patches include a combined fan-ring parasitic patch (13). The combined fan-ring parasitic patch (13) is composed of multiple sub-patterns arranged at an annular interval. There is a spacing e between each sub-pattern in the same layer and a spacing d between adjacent concentric fan-ring parasitic patches.

2. The planar shield of claim 1, wherein, The concentric fan ring parasitic patch also includes an outermost integrated fan ring parasitic patch (14), which is located outside all the combined fan ring parasitic patches (13).

3. The planar shield according to claim 1 or 2, characterized in that The central fan-shaped parasitic patch (12) is a fan-shaped patch fixed at the center of the front side of the substrate (11), and the central angle of the fan shape is equal to the central angle of the concentric fan-shaped parasitic patch of each layer.

4. The planar shield of claim 3, wherein, The central angle is any angle between 90 and 270 degrees.

5. A shielding device based on a wireless network of a park, comprising the planar shield according to claim 1, further comprising a radio frequency module (30), a control unit (40) and a power supply system (50), characterized in that, The signal input terminal of the radio frequency module (30) is connected to the power supply signal line (16) of the planar shield to generate electromagnetic wave signals; the control unit is connected to the control terminal of the radio frequency module to control the working state of the radio frequency module; the power supply system provides stable power support for the entire device.

6. The shielding device according to claim 5, characterized in that, The radio frequency module (30) includes a signal source generation module, a power amplifier module, a filter, and a modulator. The output end of the signal source generation module is connected to the input end of the power amplifier module. The output end of the power amplifier module is connected in series with the filter and then connected to the input end of the modulator. The output end of the modulator is connected to the feed signal line (16). The control unit (40) controls the signal source generation module. The high-frequency current output by the signal source generation module is transmitted to the feed patch through the power amplifier module, the filter, the modulator, and the feed network, so that alternating current and electric field are generated on the patch, thereby exciting electromagnetic waves.

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