Electronic shielding fence protection device based on park wireless network and deployment method

Abstract

The invention relates to an electronic shielding fence protection device based on a park wireless network and a deployment method, the device comprises a planar antenna, a radio frequency module, a control unit and a power supply system, the substrate of the planar antenna is provided with a central through hole, and the back surface is a wafer feed patch; a parasitic patch group consisting of a central fan-shaped parasitic patch and a plurality of concentric fan-shaped parasitic patches is arranged on the front surface of the planar antenna, part of the concentric fan-shaped parasitic patches are formed by sub-patches arranged at intervals, the adjusting mechanism can adjust the distance between the sub-patches, the radio frequency module is connected with the planar antenna to generate and process electromagnetic wave signals, and the control unit controls the working state of the radio frequency module. The power supply system provides electric power, signal excitation electromagnetic waves interact with the parasitic patches through the through holes, the antenna characteristics can be changed by changing the distance, the adjusting mechanism drives the sliding plate to finely adjust and optimize the directionality, the antenna direction can be manually or automatically adjusted through the design of the overturning frame and the sheath, different position scenes of a park are adapted, directional shielding is achieved, and interference is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic shielding, and particularly relates to an electronic shielding fence protection device and a deployment method based on a park wireless network. Background Art

[0002] With the rapid development of wireless communication technology, wireless networks are increasingly widely used in major industrial parks. However, the openness of wireless networks also brings certain security risks, such as information leakage and illegal intrusion. The electronic shielding fence protection device for industrial park wireless networks is a professional device designed to accurately shield wireless signals within the park to ensure the information and network security of the park, and it interferes with illegal access to the park's network from the outside by transmitting specific wireless signals.

[0003] In the prior art, the relevant protection means mainly include traditional full-band full-area coverage blockers and simple directional antenna shielding systems. The traditional full-band full-area coverage blocker takes an omnidirectional antenna, a signal generator, and a power amplification module as the core, and blocks all wireless signals within the area without discrimination by transmitting high-intensity broadband interference signals, so as to achieve full coverage of the target area. The simple directional antenna shielding system uses ordinary directional antennas and basic signal generators, and can only roughly shield signals in a fixed direction.

[0004] The common problems and deficiencies in the prior art are as follows: 1. Non-discriminatory interference: While blocking external illegal connections, the traditional full-band full-area coverage blocker will cause serious signal interference to legal wireless devices within the shielding area, resulting in their inability to work properly. Due to its lack of directional control ability, it cannot distinguish the signal source direction and the target area. 2. Insufficient directional ability: Most of the existing antenna designs are omnidirectional transmission or fixed-direction high-gain transmission, lacking adjustable gain control technology for planar fan-shaped areas, and it is difficult to accurately shield specific directions (such as the outside of building facades) in three-dimensional space. For example, it is impossible to only target illegal access points outside the building for directional interference without affecting indoor signals. 3. Poor frequency adaptability: Traditional blockers usually only interfere with fixed frequency bands (such as 2.4 GHz or 5 GHz), and it is difficult to flexibly adapt to the multi-band requirements of different WiFi protocols. Moreover, signal parameters need to be manually configured, resulting in high deployment costs and low efficiency. 4. Single deployment method: Most of the prior art is single-point omnidirectional shielding, lacking a systematic three-dimensional space deployment plan, and it is easy to form protection blind spots in multi-story buildings or complex-structured spaces, unable to meet the comprehensive protection requirements of scenarios such as industrial parks.

[0005] In view of the many deficiencies in the existing industrial park wireless signal shielding technology, which seriously affect the security and normal use of the park network. A new shielding technology that can accurately shield illegal signals, ensure smooth communication of internal legal devices, and adapt to the complex spatial environment of the park is urgently needed to improve the network security protection level of the park. Summary of the Invention

[0006] Aiming at the defects and problems existing in the prior art, the present invention aims to provide an electronic shielding fence protection device based on the campus wireless network and its deployment method, to achieve precise shielding of wireless signals in the campus, improve the shielding effect, directivity control and scene adaptation ability, and ensure the information security of places such as campuses.

[0007] The solution of the present invention to solve its technical problems is: adopting an electronic shielding fence protection device based on the campus wireless network, including a planar antenna, a radio frequency module, a control unit and a power supply system. The planar antenna includes a substrate, a feeding patch, a parasitic patch group and an adjusting mechanism; the substrate has a central through hole, the feeding patch is a circular feeding patch and is arranged on the back of the substrate; the parasitic patch group is arranged on the front of the substrate and includes a central sector parasitic patch and a plurality of concentric sector ring parasitic patches; among them, at least one layer of concentric sector ring parasitic patches is composed of a plurality of sub-patches arranged at intervals along the ring, and there is a spacing e between the sub-patches of the same layer, and there is a spacing d between adjacent concentric sector ring parasitic patches; the adjusting mechanism is used to adjust the spacing d and / or e of each sub-patch; the radio frequency module is connected to the planar antenna and is used to generate and process electromagnetic wave signals; the control unit is connected to the radio frequency module and is used to control the working state of the radio frequency module and adjust the frequency, phase and power of the signal; the power supply system provides stable power support for the entire device; among them, the high-frequency current generated by the signal source is transmitted to the feeding patch through the radio frequency module and the feeding network, so that an alternating current and electric field are generated on the patch, and then electromagnetic waves are excited. The electromagnetic waves pass through the through hole in the center of the substrate and interact with the central sector parasitic patch through electromagnetic coupling. The central sector parasitic patch depends on the electromagnetic field generated by the feeding patch and induces current and voltage at the sector edge, and interacts with adjacent concentric sector rings in turn, as well as the interaction between a plurality of sub-patches. The central sector parasitic patch and the parasitic patches of a plurality of concentric sector rings simultaneously participate in the radiation process of the antenna, and the radiation pattern, bandwidth and impedance characteristics of the antenna are changed by changing the spacings d and e.

[0008] Adopting a shielding device deployment method for the electronic shielding fence protection device, including the following steps: Step 1, measuring the information of the area to be installed: using tools such as a laser rangefinder and a tape measure to measure the length, width and height of the target area, and record the wall material; mark the positions of doors, windows, ventilation openings, metal frames, etc. that may affect the shielding effect, and analyze the signal penetration path.

[0009] Step 2, Plan the layout of the blockers: According to the single-unit coverage radius and the area of the region of the blockers, plan the number of blockers according to the principle of "20% overlap of the coverage range", and adopt a grid layout in the open area; increase the density of blockers at signal leakage points such as doors, windows, and corridors; it is recommended to install at a height of 2.5 - 3 meters above the ground, avoiding large metal obstacles.

[0010] Step 3, Use a spectrum analyzer to scan the target area and record the base station frequency bands; according to the wavelength formula, derive the wavelengths of different frequency bands through the formula wavelength λ = speed of light c / frequency f; detect the signal strength (dBm) of each frequency band and mark the area with the strongest signal.

[0011] Step 4, According to the base station frequency bands, set the interference frequency range of the blockers to ensure effective shielding of common wireless communication frequency bands; adjust the transmission power according to the area and signal strength of the region to ensure coverage of the entire target area without exceeding the national regulations limit value; select the pulse scanning or continuous wave interference mode, and give priority to covering the high-usage frequency bands to improve the shielding effect and efficiency.

[0012] Step 5, Use expansion bolts or brackets to fix the blockers at the predetermined positions, ensure that the heat dissipation openings are unobstructed, adopt independent power supply or connect to the UPS, and bury the signal lines and power lines through pipes.

[0013] Step 6, Select a special-shaped reflector that is generally similar in shape to the planar antenna, and firmly install the reflector behind the planar antenna to ensure an appropriate distance between the reflector and the antenna.

[0014] Advantages of the present invention: 1. Accurately shield wireless signals: The planar antenna adopts a unique parasitic patch group design, which can achieve accurate shielding of wireless signals in the park. By fine-tuning each sub-patch through the adjustment mechanism and combining the high-performance signal processing of the RF module, it is possible to effectively shield wireless signals in specific frequency bands, while reducing interference to non-target frequency band signals and improving the flexibility and accuracy of shielding.

[0015] 2. Improve the shielding effect and efficiency: The high-efficiency and wide-band power amplifier in the RF module can amplify the small-power signal generated by the signal source to a high enough power level to ensure effective shielding of wireless signals in the park. The filter effectively suppresses harmonic and spurious signals, improves the purity of the shielding signal, and avoids unnecessary interference to wireless signals in other non-target frequency bands. The modulator uses digital modulation technology to modulate the baseband signal generated by the signal source onto the RF carrier, improving the anti-interference ability and transmission efficiency of the signal, increasing the complexity of the shielding signal, and making it more difficult for the shielded wireless device to recover the original signal.

[0016] 3. Enhanced Directional Control and Adaptability to Different Scenarios: The adjustment mechanism can drive the sliding plate to move slightly in the radial and circumferential directions, optimizing the directivity of the planar antenna. Through the design of the flipping frame and the sheath, manual or automatic adjustment of the antenna direction can be achieved, better meeting the wireless signal shielding requirements in different locations and scenarios within the park, enabling directional shielding of specific areas and avoiding unnecessary interference to other areas.

[0017] 4. Ensure Normal Communication of Internal Devices: Compared with the traditional omnidirectional coverage shielding method, this solution can achieve precise shielding of wireless signals, effectively avoiding interference to legal wireless devices within the park and ensuring the normal communication of internal devices. Through precise frequency matching, power adjustment, and modulation mode selection, the shielding requirements for wireless signals in different scenarios within the park can be met without affecting the normal use of internal legal devices.

[0018] 5. Modular Design for Easy Maintenance and Upgrade: The radio frequency module, control unit, power supply system, planar antenna, etc. adopt an independent modular design. The modules are connected through standardized interfaces and connectors, facilitating quick location and replacement of the corresponding module in case of a fault. Maintenance space and interfaces are reserved, making it convenient for maintenance personnel to inspect, repair, and replace internal components, greatly shortening the maintenance time and improving the availability and reliability of the device. Description of the Drawings

[0019] Figure 1 is the front view of the planar antenna of the present invention; Figure 2 is Figure 1 the perspective view of Figure 3 is Figure 2 one of the assembly relationship diagrams of Figure 4 is Figure 2 the second assembly relationship diagram of Figure 5 is the combined structure schematic diagram of the main sliding plate and the auxiliary sliding plate; Figure 6 is one of the installation structure schematic diagrams of the planar antenna; Figure 7 is Figure 6 the side view of Figure 8 is the system architecture block diagram of the protection device of the present invention; Figure 9 is the deployment schematic diagram of the present invention; Figure 10 is the voltage intensity distribution schematic diagram of the planar antenna of the present invention; Figure 11 is the voltage distribution density and current direction schematic diagram of the planar antenna of the present invention; Figure 12 It is a schematic diagram of the current distribution density and current direction of the planar antenna of the present invention.

[0020] Reference numerals in the figure: substrate 1; composite ring plate 2; composite circular plate 3; parallel rail 4; radial rail 5; main slide plate 6; parallel chute 7; auxiliary slide plate 8; radial chute 9; convex arc block 10; concave arc groove 11; central sector parasitic patch 12; combined sector ring parasitic patch 13; integral sector ring parasitic patch 14; feed patch 15; drive mechanism assembly hole 16; drive end sleeve hole 17; substrate center hole 18; composite plate center hole 19; planar antenna 20; fixed seat 21; flip frame 22; control unit housing 23; rotating socket part 24; turntable 25; sheath 26; base 27; drive mechanism 28; RF module 30; control unit 40; power supply system 50; buildings in the park 60; visual shielding wall 70; equipment installation position 80. Specific embodiments

[0021] The present invention will be further described below with reference to the drawings and embodiments.

[0022] Embodiment 1: An electronic shielding fence protection device based on a park wireless network mainly includes a planar antenna 20, an RF module 30, a control unit 40, and a power supply system 50. Each part works together to achieve precise shielding of wireless signals in the park. By optimizing key parts such as the planar antenna design, RF module, feed network, and control unit, effective shielding of wireless signals is achieved, and it has good directivity control and the ability to adapt to different scenarios.

[0023] As Figure 1 and Figure 2 shown, the planar antenna 20 includes a substrate 1, a feed patch 15, a parasitic patch group, and an adjustment mechanism, etc. The substrate 1 is made of a resin material with low loss and high dielectric constant, such as an FR-4 glass fiber epoxy resin board, with a thickness of 1.6 mm, ensuring good electromagnetic performance and mechanical support. A circular feed patch 15 is fixed at the center position on the back of the substrate 1, made of copper foil, with a diameter of 20 mm, and is fixed by conductive adhesive to ensure close fitting with the substrate and reduce signal transmission loss. The parasitic patch group includes a central sector parasitic patch 12 and concentric sector ring parasitic patches (combined sector ring parasitic patch 13 and integral sector ring parasitic patch 14).

[0024] Central sector parasitic patch 12: A central sector parasitic patch 12 is fixed at the center of the front side of the substrate 1. It is made of copper foil, with a central angle of the sector being 120° and a radius of 15 mm. It is installed by mechanical fixing to ensure position accuracy and stability. Concentric fan-ring parasitic patches: Multiple concentric fan-ring parasitic patches (including combined fan-ring parasitic patch 13 and integral fan-ring parasitic patch 14) are fixed outside the central sector parasitic patch 12. The width of each concentric fan-ring is 5 mm, and the distance between adjacent concentric fan-rings is d, where d1, d2,... are about 1 mm respectively. The distances are equal or unequal, and are optimized according to actual requirements.

[0025] Among them, at least one layer of concentric fan-ring parasitic patches is composed of multiple sub-patches arranged at intervals along the ring. This layer of concentric fan-ring parasitic patch is the combined fan-ring parasitic patch 13. There is a distance e between the sub-patches in the same layer, where e1, e2,... are about 0.5 mm. The distances are equal or unequal, and precision machining technology is used to ensure the consistency and accuracy of the distances.

[0026] A through hole with a diameter of 3 mm is set at the center of the substrate 1 to ensure that the high-frequency current generated by the signal source can pass through smoothly and provide a channel for electromagnetic coupling. The feeding network adopts a microstrip line structure composed of standard 50Ω microstrip lines. It is led out from the output port of the signal source, passes through a power divider, a matching network, and a transmission line in sequence, and finally connects to the feeding patch 15. The power divider adopts a Wilkinson power divider to achieve uniform distribution of signals; the matching network adjusts the length and width of the microstrip line to achieve impedance matching, ensuring that the signal transmission efficiency reaches more than 95% and reducing signal reflection and loss.

[0027] The adjusting mechanism includes a sliding plate and a driving mechanism, etc. Each sub-patch is fixed on the surface of the corresponding sliding plate, and the driving mechanism is used to drive each sliding plate to move for fine adjustment radially and circumferentially. Specifically, as Figures 1-5 shown, the feeding patch 15 is fixed on the rear side of the substrate 1, the composite circular plate 3 is fixed at the center of the front side of the substrate 1, and the composite ring plate 2 is fixed at the edge of the front side of the substrate 1. Thus, an arc-shaped groove area is formed between the composite ring plate 2 and the composite circular plate 3. A parallel rail 4 is fixed at the bottom near the center position between the composite ring plate 2 and the composite circular plate 3, and a radial rail 5 is fixed at the edge position. A parallel sliding groove 7 is arranged at the bottom of the main sliding plate 6, and a radial sliding groove 9 is arranged at the bottom of the auxiliary sliding plate 8. The parallel sliding groove 7 is fitted outside the parallel rail 4, and the radial sliding groove 9 is fitted outside the radial rail 5. After fitting, there is a gap d between the arc-shaped edges of the main sliding plate 6 and the auxiliary sliding plate 8 and the composite ring plate 2 and the composite circular plate 3 respectively, and there is a gap e between the main sliding plate 6 and the auxiliary sliding plate 8, or between adjacent auxiliary sliding plates 8.

[0028] As Figure 5As shown in the figure, convex arc blocks 10 can be respectively arranged on one side edge of the main slide plate 6 and the auxiliary slide plate 8, and concave arc grooves 11 are arranged on the other side edge. The adjacent convex arc blocks 10 and concave arc grooves 11 are sleeved together. At this time, only one driving mechanism is needed to drive the main slide plate 6. When the main slide plate 6 moves outward or inward along the parallel rail 4, it can drive the adjacent parallel sliding grooves 7 to move radially outward or inward along the radial rail 5 through the convex arc blocks 10 or concave arc grooves 11, realizing the linkage effect.

[0029] The driving mechanism is assembled on the inner side or the outer end of the main slide plate 6. For example, Figure 4 as shown in the figure, a driving mechanism assembly hole 16 is arranged at the center of the composite ring plate 2, and at the same time, a driving end sleeve hole 17 is arranged at the center of the main slide plate 6. The driving mechanism is assembled in the driving mechanism assembly hole 16, and the telescopic end of the driving mechanism is sleeved in the driving end sleeve hole 17. The driving mechanism can adopt a piezoelectric ceramic driver or a ball screw pair drive, etc. Among them, the piezoelectric ceramic driver utilizes the inverse piezoelectric effect of piezoelectric ceramics to generate mechanical deformation under the action of an electric field, has sub-nanometer resolution, high positioning accuracy, such as the PiezoWalk stepping driver, which is fixed at the corresponding position at the outer end of the composite ring plate 2 or the sheath 26, its push rod is sleeved in the driving mechanism assembly hole 16, and the end of its push rod is fixed in the driving end sleeve hole 17, and an open-loop 1nm movement can be realized; it has a fast response speed, can quickly reach a stable state, has good self-locking performance, and can maintain the output force and displacement for a long time after power-off; it is small in size, light in weight, and has a compact structure. When the lead screw (sleeved in the driving mechanism assembly hole 16) of the ball screw pair (fixed at the corresponding position at the outer end of the composite ring plate 2 or the sheath 26) rotates, the nut (sleeved and fixed in the driving end sleeve hole 17) cooperating with it will move in a straight line direction, thereby driving the connected components to perform a straight-line motion. Ball screws, hydrostatic screws, differential screws, etc. are common types. For example, the hydrostatic screw has high stiffness, small wear, high precision, stable operation, and can achieve a relatively high movement speed; the differential screw can achieve a very small displacement and improve the transmission accuracy. By selecting a super-high-precision lead screw, optimizing the nut structure, and adopting corresponding error compensation measures, a control accuracy of the nm level can be achieved.

[0030] For example, Figure 6 and Figure 7As shown in the figure, the fixed seat 21 is fixed to the structural wall surface or the top surface. The inner end of the flipping frame 22 is hinged to the surface support of the fixed seat 21 through the first pin shaft, and the outer end is hinged to the rear support of the control unit housing 23 through the second pin shaft. The first pin shaft and the second pin shaft are parallel, inclined or perpendicular to each other. A groove is provided on the front surface of the sheath 26, and the planar antenna 20 is installed in the groove area. An inner rotating sleeve is provided on the rear side of the sheath 26, and an outer rotating sleeve is provided at the front end of the control unit housing 23. The inner and outer rotating sleeves are sleeved together to form a rotating socket part 24. A turntable 25 is also provided on the rear side wall of the sheath 26 to facilitate manual rotation to enable the sheath 26 to rotate, or a servo motor is installed in the control unit housing 23, and its rotating shaft is connected to the center of the rear wall of the driving mechanism assembly hole 16 for automatically controlling the rotation of the sheath 26.

[0031] A control unit 40, a radio frequency module 30, a power supply system 50, etc. are installed in the control unit housing 23. Among them, the radio frequency module 30 mainly consists of the following parts: 1. Signal source: A highly stable synthesized signal generator is adopted, with a frequency range covering common wireless communication frequency bands (such as 2.4GHz Wi-Fi frequency band, 5GHz Wi-Fi frequency band, 900MHz GSM frequency band, etc.), a frequency accuracy of up to ±10ppm, and an output power range of -20dBm to +10dBm, providing a stable signal basis for subsequent signal processing.

[0032] 2. Power amplifier: A high-efficiency and wide-band GaN power amplifier is selected, with a maximum output power of up to 30dBm. It amplifies the relatively small power signal generated by the signal source to a sufficiently high power level to ensure effective shielding of wireless signals in the park. During the amplification process, by optimizing the bias circuit and heat dissipation design of the amplifier, it is ensured that the amplifier maintains a stable working state during high-power output while reducing nonlinear distortion.

[0033] 3. Filter: A band-pass filter is adopted, and the passband frequency range is designed according to the target shielding frequency band, such as 2.4GHz to 2.5GHz, with an in-band insertion loss of less than 2dB and an out-of-band rejection of greater than 40dB, effectively suppressing harmonics and spurious signals, improving the purity of the shielding signal, and avoiding unnecessary interference to wireless signals in other non-target frequency bands.

[0034] 4. Modulator: Digital modulation technology such as QPSK (Quadrature Phase Shift Keying) modulation is adopted to modulate the baseband signal generated by the signal source onto the radio frequency carrier, improving the anti-interference ability and transmission efficiency of the signal, and at the same time increasing the complexity of the shielding signal, making it more difficult for the shielded wireless device to recover the original signal.

[0035] The control unit 40 adopts a high-performance microcontroller (such as the ARM Cortex-M series microcontroller) and has the following functions: 1. Working state control: Through a preset control program, the turning on, turning off of the RF module 30 and the switching between different working modes are controlled, such as the full-band shielding mode, the specific-band shielding mode, etc., to meet the wireless signal shielding requirements in different scenarios within the park.

[0036] 2. Signal parameter adjustment: According to the actual application scenarios and requirements, the frequency, phase and power of the signal are precisely adjusted. The frequency adjustment accuracy can reach ±1 Hz, the phase adjustment accuracy is ±1°, and the power adjustment step is 1 dB. By real-time monitoring the output signal of the RF module 30 and comparing it with the preset target parameters, the PID (Proportional-Integral-Derivative) control algorithm is used to perform closed-loop control on the RF module 30 to ensure the parameter stability and accuracy of the output signal.

[0037] 3. Fault monitoring and alarm: The working states of key components such as the RF module 30, the planar antenna 20 and the feeding network are monitored in real time, such as parameters of the power amplifier like temperature, voltage, current, and indicators of the antenna like reflection coefficient, voltage standing wave ratio, etc. Once an abnormal situation is detected, the alarm mechanism is immediately triggered, and the maintenance personnel are notified in a timely manner to handle it through means such as indicator light flashing, sound alarm or sending alarm information to the remote monitoring center, ensuring the reliable operation of the device.

[0038] The power supply system 50 adopts a switching power supply with a wide input voltage range. The input voltage range is AC100V - 240V, and the output DC voltages are +12V and +5V, providing stable power support for components such as the RF module 30, the control unit 40 and the planar antenna 20 respectively. The power supply system 50 has protection functions such as overcurrent, overvoltage and short circuit, ensuring that the device will not be damaged under abnormal conditions. At the same time, electromagnetic shielding technology and filtering circuits are adopted to reduce the interference of the power supply on the internal signals of the device, and the power efficiency reaches more than 85%, ensuring the stability and reliability of the device during long-term operation.

[0039] Electromagnetic shielding measures: The outer shell of the device is made of galvanized steel plate with a thickness of 1.5 mm, and a good grounding treatment is carried out on the surface to ensure that the electromagnetic shielding effectiveness of the outer shell reaches more than 60 dB, effectively blocking the leakage of internal electromagnetic signals to the external environment and preventing external electromagnetic interference from affecting the normal operation of the device. Magnetic rings and filtering capacitors are installed on the power line and signal line to filter the electromagnetic interference on the power line and signal line, further improving the electromagnetic compatibility of the device.

[0040] Enhanced anti-interference ability: In the circuit design of the control unit 40 and the RF module 30, a multi-layer printed circuit board (PCB) layout is adopted. The power layer, ground layer, and signal layer are reasonably arranged. By adding decoupling capacitors, optimizing wiring, etc., the electromagnetic coupling and interference inside the circuit are reduced. At the same time, anti-interference measures are introduced in the software algorithm, such as filtering algorithms and error correction coding in digital signal processing, to improve the device's resistance to electromagnetic interference. Embodiment 1: An electronic shielding fence protection device based on a campus wireless network mainly includes a planar antenna 20, an RF module 30, a control unit 40, and a power supply system 50. Each part works together to achieve precise shielding of wireless signals within the campus.

[0041] Mechanical fixing method: The planar antenna 20 and its components adopt a mechanical fixing method. For example, the feeding patch 15 and the parasitic patch are fixed on the substrate 1 to ensure that the patch position remains stable under the action of external factors such as vibration and wind load, without loosening or displacement. The substrate 1 and the device housing are fixed by a high-strength connecting bracket. The material of the connecting bracket is aluminum alloy, which is precision machined and surface treated to ensure the structural stability and electrical performance of the planar antenna 20 during long-term use. The device housing is made of high-strength and corrosion-resistant engineering plastic, with good mechanical properties and environmental adaptability, capable of withstanding harsh weather conditions and external physical impacts, ensuring the long-term stable operation of the device in the campus outdoor environment.

[0042] Modular design: The RF module 30, the control unit 40, the power supply system 50, the planar antenna 20, etc. are designed as independent modules. Each module is connected through standardized interfaces and connectors, which is convenient for quickly locating and replacing the corresponding module in case of a fault. For example, the RF module 30 adopts a plug-and-play connection method, and its connection with the feeding network and the control unit 40 is realized through special RF connectors and data interfaces, without complex welding and debugging processes, greatly shortening the maintenance time.

[0043] Reserved maintenance space and interfaces: In the internal structure design of the device, sufficient maintenance space is reserved to facilitate maintenance personnel to inspect, repair, and replace internal components. At the same time, a maintenance door that is easy to open is set on the device housing. The maintenance door adopts a lock-and-latch design to ensure good sealing of the housing during normal operation to prevent foreign objects from entering the device, and can be quickly opened when maintenance is required, providing convenience for maintenance work. In addition, debugging interfaces such as USB interfaces and serial ports are set on the control unit 40 and the RF module 30, which is convenient for using professional test equipment for fault diagnosis and parameter debugging.

[0044] For the above-mentioned electronic shielding fence protection device based on a campus wireless network, the high-frequency current generated by the signal source is transmitted to the feeding patch through the RF module and the feeding network, such as Figures 10-12As shown, an alternating current and electric field are generated on the patch, thereby exciting electromagnetic waves. The electromagnetic waves pass through the through-hole in the center of the substrate and interact with the central sector parasitic patch through electromagnetic coupling. The central sector parasitic patch depends on the electromagnetic field generated by the feeding patch, and induces current and voltage at the sector edge, and interacts with adjacent concentric sector rings in sequence, as well as interacts between multiple sub-patches. The central sector parasitic patch and the parasitic patches of multiple concentric sector rings simultaneously participate in the radiation process of the antenna. By changing the distances d and e, the radiation pattern, bandwidth, and impedance characteristics of the antenna can be changed.

[0045] The above-mentioned electronic shielding fence protection device based on the campus wireless network realizes effective shielding of wireless signals by optimizing key parts such as the planar antenna 20, the radio frequency module 30, the feeding network, and the control unit 40, and has good directivity control and the ability to adapt to different scenarios. At the same time, comprehensive considerations and detailed descriptions are carried out in aspects such as electromagnetic compatibility, heat dissipation, structural stability, maintainability, performance evaluation and testing, application scenario expansion, and cost-benefit analysis, ensuring the reliability and practicability of the device. The device has broad application prospects in fields such as campus security, examination rooms, prisons, and military facilities, and can provide strong guarantee for information security.

[0046] Embodiment 2: A method for deploying a shielding device for an electronic shielding fence protection device based on Embodiment 1, as shown in the figure, includes the following content.

[0047] I. Preliminary preparation work (1) Measuring the information of the area to be installed 1. Tool preparation: Use tools such as a laser rangefinder and a tape measure to measure the length, width, and height of the target area (such as a factory workshop, a classroom, the perimeter of a campus, etc.), and record the wall materials (such as concrete, metal, glass, etc.).

[0048] 2. Marking key areas: Mark positions such as doors, windows, ventilation openings, and metal frames that may affect the shielding effect, and analyze the signal penetration paths.

[0049] (2) Planning the layout of the shielding devices 1. Quantity calculation: According to the single-device coverage radius of the shielding device (such as 30 meters) and the area of the region, plan the number of shielding devices according to the principle of "20% overlap of the coverage range". Formula: Quantity = Area of the region / (π × Coverage radius² × 0.8).

[0050] 2. Layout design: Uniform distribution: Adopt a grid layout in an open area to ensure no dead spots for signals.

[0051] Key strengthening: Increase the density of shielding devices at signal leakage points such as doors, windows, and corridors.

[0052] Installation height: It is recommended to be 2.5 - 3 meters above the ground (wall-mounted or ceiling-mounted), avoiding large metal obstacles.

[0053] (III) Detecting signal base station parameters 1. Frequency scanning: Use a spectrum analyzer to scan the target area and record the 2G / 3G / 4G / 5G base station frequency bands (such as mobile 900 MHz, 1800 MHz, telecom 2100 MHz, etc.).

[0054] 2. Wavelength calculation: Derive the wavelengths of different frequency bands through the formula wavelength λ = speed of light c / frequency f (such as the wavelength corresponding to 2.4 GHz is 12.5 cm).

[0055] 3. Signal strength detection: Detect the signal strength (dBm) of each frequency band and mark the area with the strongest signal (such as near the window or high-rise position).

[0056] II. Jammer parameter design (I) Frequency matching According to the base station frequency bands, set the interference frequency range of the jammer (such as full coverage from 800 MHz to 3500 MHz) to ensure effective shielding of common wireless communication frequency bands.

[0057] (II) Power adjustment Adjust the transmission power according to the area and signal strength (such as 10W - 50W) to ensure full coverage of the target area without exceeding the national regulations limit.

[0058] (III) Modulation mode selection Select the pulse scanning or continuous wave interference mode, and give priority to covering high-usage frequency bands (such as 4G / 5G) to improve the shielding effect and efficiency.

[0059] III. Jammer installation (I) Installation method 1. Fix the jammer: Use expansion bolts or brackets to fix the jammer at the predetermined position, ensuring that the heat dissipation openings are unobstructed to guarantee the stability and reliability of the equipment during operation.

[0060] 2. Connect the power supply: Use independent power supply or connect to a UPS (uninterruptible power supply) to avoid abnormal operation of the jammer caused by unstable voltage and ensure normal operation under power supply fluctuations.

[0061] 3. Hide the wires: Run the signal wires and power wires through pipes and bury them to reduce external interference, and at the same time improve the cleanliness and safety of the installation environment.

[0062] (II) Installation of antenna reflector 1. Reflector selection: Select a special-shaped reflector that is generally similar to the shape of the planar antenna to enhance the directivity and gain of the antenna and improve the shielding effect.

[0063] 2. Reflector Fixing: Firmly install the reflector behind the planar antenna, ensuring an appropriate distance between the reflector and the antenna to achieve the best signal reflection effect.

[0064] IV. Effect Verification and Optimization (I) Effect Testing 1. Tool Usage: Use devices such as mobile phones and signal detectors to test the signal strength of 2G - 5G within the shielding area.

[0065] 2. Testing Standard: Ensure that the signal strength in the shielding area ≤ -85dBm (no communication ability), and the attenuation in the boundary area is smooth without sudden changes to achieve effective shielding of the target area.

[0066] (II) Optimization and Adjustment According to the test results, adjust the device angle, power or add shielding devices as needed to eliminate possible blind spots and further improve the shielding effect.

[0067] V. Maintenance and Management Regularly inspect and maintain the shielding device, including cleaning the device surface, checking connection lines, updating software, etc., to ensure the long-term stable operation of the device. At the same time, establish a complete device management file to record the situation of each maintenance and test, so as to promptly detect problems and take corresponding solutions.

[0068] VI. Performance Evaluation and Testing 1. Performance Evaluation Indicators: Shielding Efficiency: At a distance of 1 meter from the device, test common wireless communication frequency bands (such as 2.4GHz Wi-Fi band, 5GHz Wi-Fi band, 900MHz GSM band, etc.). The shielding efficiency reaches above 40dB, ensuring effective shielding of wireless signals inside the park, preventing external wireless signals from penetrating the protection device into the park, and at the same time preventing internal wireless signals from leaking outside the park.

[0069] Operating Bandwidth: The operating bandwidth of the planar antenna covers multiple wireless communication frequency bands, with a bandwidth range of more than 500MHz, which can meet the shielding requirements of different wireless communication devices in the park, achieve simultaneous shielding of multiple wireless signals, and improve the versatility and practicality of the device.

[0070] Pattern Purity: By optimizing the patch layout and spacing design of the planar antenna, the pattern purity of the antenna reaches above 90%, that is, the radiation energy in the main lobe direction accounts for more than 90% of the total radiation energy, ensuring that the shielding signal is concentrated in the target area, reducing interference to non-target areas, and improving the accuracy and effectiveness of shielding.

[0071] Impedance matching characteristics: The impedance matching between the feeding network and the planar antenna is good, with a reflection coefficient less than -10 dB and a voltage standing wave ratio less than 1.5:1, ensuring the minimum signal loss during transmission. The radiation efficiency of the antenna reaches over 70%, improving the energy utilization efficiency and signal transmission quality of the device.

[0072] 2. Test verification: Laboratory test: Performance tests are carried out in a professional electromagnetic compatibility laboratory using test equipment such as vector network analyzers, spectrum analyzers, and signal sources to accurately measure and evaluate the performance indicators of the device. In a laboratory environment without reflection and interference, verify whether the shielding effectiveness, working bandwidth, pattern purity, and impedance matching characteristics of the device meet the design requirements, record and analyze the test results in detail, and optimize and improve the problems found in a timely manner.

[0073] Field test: Conduct field tests in the actual park environment, simulate the wireless communication environment in different scenarios within the park, such as office areas, production workshops, outdoor public areas, etc. Install the device at the predetermined position and use wireless signal detection equipment to monitor the wireless signal strength inside and outside the park in real time. By comparing the changes in wireless signals before and after installing the device, evaluate the actual shielding effect and adaptability of the device. At the same time, test the stability and reliability of the device under different environmental conditions, such as harsh environments of high temperature, low temperature, humidity, and vibration, to ensure that the device can meet the actual application requirements of the park and provide reliable protection for the information security of the park.

[0074] VII. Application scenario expansion 1. Park security: As an electronic shielding fence for the park's wireless network, it is installed at key positions such as the surrounding walls and building entrances of the park to prevent external wireless signal intrusion and internal information leakage, and ensure the security of the internal network and data of the park.

[0075] 2. Examination rooms: Install this device in examination rooms. By adjusting the shielding frequency band and direction, it can shield the signals of wireless communication devices such as mobile phones and walkie-talkies, effectively preventing candidates from cheating using wireless devices and maintaining the fairness and justice of the examination.

[0076] 3. Prisons: Deploy this device around prison walls and cells to prevent prisoners from using illegal wireless devices to contact the outside world, prevent events such as prison breaks and escapes, and improve the security prevention ability of prisons.

[0077] 4. Military facilities: Set up an electronic shielding fence around important military facilities such as military bases and command centers to shield enemy wireless signal reconnaissance and interference, protect the security of military communications and information, and at the same time prevent the leakage of friendly wireless signals to ensure the confidentiality of military operations.

[0078] VIII. Benefit analysis: Security protection benefits: This device can effectively shield wireless signals, prevent information leakage and illegal intrusion, safeguard the safety of personnel, property and information within the park, and avoid huge economic losses and reputation damage to the park caused by information security incidents. Its security protection benefits are immeasurable in terms of money.

[0079] Management benefits: After installing this device within the park, it can standardize the use of wireless communication devices, reduce wireless signal interference, improve the management efficiency and reliability of the wireless network within the park, provide strong support for the informatization construction and daily operation of the park, and indirectly improve the economic benefits of the park.

[0080] Enhanced market competitiveness: The electronic shielding fence protection device of the present invention has high performance, multiple functions and good adaptability, has obvious advantages compared with similar products on the market, can meet the needs of different users, has strong competitiveness in the electronic shielding market, is expected to obtain a high market share, and bring considerable economic benefits to the manufacturing enterprise.

[0081] The above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principles of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electronic shielding fence protection device based on a campus wireless network, comprising a planar antenna (20), a radio frequency module (30), a control unit (40) and a power supply system (50), characterized in that, The planar antenna (20) includes a substrate (1), a feeding patch (15), a parasitic patch group, and an adjusting mechanism; the substrate has a central through hole, the feeding patch is a disc feeding patch and is arranged on the back surface of the substrate; the parasitic patch group is arranged on the front surface of the substrate and includes a central sector parasitic patch and a plurality of concentric sector ring parasitic patches; wherein, at least one layer of the concentric sector ring parasitic patches is composed of a plurality of sub-patches arranged at intervals along a ring, there is a spacing e between the sub-patches of the same layer, and there is a spacing d between adjacent concentric sector ring parasitic patches; the adjusting mechanism is used to adjust the spacing d and / or e of each sub-patch; the radio frequency module is connected to the planar antenna and is used to generate and process electromagnetic wave signals; the control unit is connected to the radio frequency module and is used to control the working state of the radio frequency module and adjust the frequency, phase, and power of the signal; the power supply system provides stable power support for the whole device; wherein, the high-frequency current generated by the signal source is transmitted to the feeding patch through the radio frequency module and the feeding network, so that an alternating current and electric field are generated on the patch, and then electromagnetic waves are excited. The electromagnetic waves pass through the through hole in the center of the substrate and interact with the central sector parasitic patch by means of electromagnetic coupling. The central sector parasitic patch depends on the electromagnetic field generated by the feeding patch and induces current and voltage at the sector edge, and interacts with adjacent concentric sector rings in turn, as well as interacts between a plurality of sub-patches. The central sector parasitic patch and the parasitic patches of a plurality of concentric sector rings simultaneously participate in the radiation process of the antenna, and the radiation pattern, bandwidth, and impedance characteristics of the antenna are changed by changing the spacings d and e.

2. The electronic shielding fence protection device according to claim 1, characterized in that, The central sector parasitic patch (12) is to fix a central sector parasitic patch (12) at the center of the front surface of the substrate (1), made of copper foil material, and the central angle of the sector is 120°; the concentric sector ring parasitic patches are to fix a plurality of concentric sector ring parasitic patches on the outside of the central sector parasitic patch (12), made of copper foil material, and the central angle of the sector is 120°.

3. The electronic shielding fence protection device according to claim 1, characterized in that, The adjusting mechanism includes a slide plate and a driving mechanism. Each sub-patch is fixed on the surface of the corresponding slide plate, and each slide plate is driven by the driving mechanism to move finely along the radial direction and move finely along the circumferential direction.

4. The electronic shielding fence protection device according to claim 3, characterized in that, The adjusting mechanism is that a composite ring plate (2) is fixed on the edge of the front side surface of the substrate (1). Thus, an arc-shaped groove area is formed between the composite ring plate (2) and the composite circular plate (3). A plurality of slide plates are assembled in the arc-shaped groove area through tracks. The outer surface of each slide plate is fixed with the sub-patch, and a single or multiple slide plates are driven by the driving mechanism to move along the radial direction and / or move along the circumferential direction.

5. The electronic shielding fence protection device according to claim 4, characterized in that, A parallel rail (4) is fixed at the center of the bottom between the composite ring plate (2) and the composite circular plate (3), and a radial rail (5) is fixed at the edge position. The sliding plate includes a main sliding plate (6) and an auxiliary sliding plate (7). A parallel sliding groove (7) is arranged at the bottom of the main sliding plate (6), and a radial sliding groove (9) is arranged at the bottom of the auxiliary sliding plate (8). The parallel sliding groove (7) is sleeved on the outside of the parallel rail (4), and the radial sliding groove (9) is sleeved on the outside of the radial rail (5). A convex arc block (10) is arranged at one side edge of the main sliding plate (6) and the auxiliary sliding plate (8), and a concave arc groove (11) is arranged at the other side edge. The adjacent convex arc block (10) and concave arc groove (11) are sleeved together. The driving mechanism is assembled on the inner side or the outer end of the main sliding plate (6) and is used to drive the main sliding plate (6) to move radially outward or inward.

6. The electronic shielding fence protection device according to any one of claims 1-5, characterized in that, The driving mechanism is a piezoelectric ceramic driver or a ball screw pair driving method.

7. The electronic shielding fence protection device according to claim 1, characterized in that, It also includes a fixing seat (21) and a turning frame (22). The fixing seat (21) is fixed on the structural wall surface or the top surface. The inner end of the turning frame (22) is hinged to the surface support of the fixing seat (21) through a first pin shaft, and the outer end is hinged to the rear support of the control unit housing (23) through a second pin shaft. A groove is arranged on the front surface of the sheath (26), and the planar antenna (20) is installed in the groove area. An inner rotating sleeve is arranged at the rear side of the sheath (26), and an outer rotating sleeve is arranged at the front end of the control unit housing (23). The inner and outer rotating sleeves are sleeved together. A turntable (25) is also arranged on the rear side wall of the sheath (26). The sheath (26) is rotated manually, or a servo motor is installed in the control unit housing (23) to automatically control the rotation of the sheath (26).

8. The electronic shielding fence protection device according to claim 1, characterized in that, The feeding network adopts a microstrip line structure, including a power divider, a matching network and a transmission line, to realize the uniform distribution of signals and impedance matching.

9. A method for deploying a shielding device of an electronic shielding fence protection device according to claim 1, characterized in that, It includes the following steps: Step 1, measure the information of the area to be installed: Use tools such as a laser rangefinder and a tape measure to measure the length, width and height of the target area, and record the wall material; Mark the positions of doors, windows, ventilation openings, metal frames, etc. that may affect the shielding effect, and analyze the signal penetration path; Step 2, plan the layout of the shielding device: According to the single - unit coverage radius and the area of the shielding device, plan the number of shielding devices according to the principle of "20% overlap of the coverage range", and adopt a grid - like layout in the open area; Increase the density of shielding devices at signal leakage points such as doors, windows and corridors; The installation height is recommended to be 2.5 - 3 meters above the ground, avoiding large metal obstacles; Step 3, scan the target area with a spectrum analyzer and record the base station frequency bands; Deduce the wavelengths of different frequency bands according to the wavelength formula; Detect the signal strength of each frequency band and mark the area with the strongest signal; Step 4, according to the base station frequency bands, set the interference frequency range of the shielding device to ensure effective shielding of common wireless communication frequency bands; Adjust the transmission power according to the area and signal strength to ensure coverage of the entire target area and not exceed the national regulations; Select the pulse scanning or continuous wave interference mode, and give priority to covering the high - usage frequency bands to improve the shielding effect and efficiency; Step 5: Fix the jammer at a predetermined position using expansion bolts or brackets, ensuring that the heat dissipation openings are unobstructed. Use independent power supply or connect to a UPS, and run the signal and power cables through pipes and bury them underground. Step 6: Select a special-shaped reflector that is generally similar in shape to the planar antenna, and firmly install the reflector behind the planar antenna, ensuring an appropriate distance between the reflector and the antenna.

10. The method according to claim 9, wherein Regarding the power adjustment in the parameter design steps of the jammer, when adjusting the transmission power according to the area and signal strength of the region, the complexity of the surrounding electromagnetic environment should also be comprehensively considered. If it is in a region with strong electromagnetic interference, appropriately increase the power limit, but not exceed 90% of the national regulatory limit. And when selecting the modulation mode, for regions that mix multiple frequency bands, the pulse scanning and continuous wave interference modes can be simultaneously enabled to achieve a more comprehensive shielding effect.

Images