Narrow space magnetic field shielding effectiveness test antenna

Abstract

The utility model discloses a narrow space magnetic field shielding effectiveness test antenna, which is characterized in that a ring of a magnetic field signal transmitting antenna is fixed on a flexible soft board, so that the antenna can stably transmit a magnetic field signal, and the antenna is flexibly arranged according to the requirements of tested equipment. According to the scheme, a coaxial cable is adopted to connect a signal source with a first antenna ring, and then a signal transmission line is twisted in pairs and wrapped by a metal net to form shielding so as to reduce interference. After the arrangement of the first antenna loop is completed, connecting the signal to the subsequent antenna loop through the twisted pair, and continuing to arrange according to the same mode to form a closed-loop system. According to the method, multiple loop antennas can be arranged at a time, and the test efficiency is remarkably improved. Through accurate signal emission and structural design, the scheme can meet the requirement of magnetic field shielding effectiveness test in a narrow space, ensures wide and consistent signal coverage, and provides an effective test means for related research and application.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic field shielding effectiveness testing, specifically relating to an antenna for testing the magnetic field shielding effectiveness in a confined space. Background Technology

[0002] A magnetic field signal transmitting antenna is a device specifically designed to transmit magnetic field signals, typically used in applications such as wireless communication, data transmission, and positioning systems. Unlike traditional electric field signal antennas, magnetic field signal antennas primarily transmit information through changing magnetic fields. The working principle of a magnetic field signal transmitting antenna is based on the radiation of electromagnetic waves. According to electromagnetic theory, when an electric current passes through a conductor, it generates a magnetic field around the conductor. When this current changes, it produces a changing magnetic field in the surrounding space, and this changing magnetic field can propagate through the air in the form of electromagnetic waves, thereby enabling data communication.

[0003] Existing magnetic field signal transmitting antennas can only be fixed in one location. After transmitting and receiving signals to test the shielding effectiveness of one area, the antenna is moved to the next location for testing. Moving to the next location requires resetting the antenna, reinstalling the equipment, and then testing at that point again. This process of setting up the antenna, testing, setting up again, and testing again continues until the test is completed. When the device under test (DUT) cannot easily have its antenna positioned, this significantly increases the difficulty of testing its shielding effectiveness, leading to longer testing times and higher costs.

[0004] Therefore, there is an urgent need for a method (antenna) that can improve the efficiency of shielding effectiveness testing in confined spaces, so as to improve the efficiency of shielding effectiveness testing of the device under test. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model aims to provide a magnetic field shielding effectiveness testing antenna for confined spaces. This antenna can be deployed at different locations within a confined space in a single operation, transmitting a signal to each tested location within the space at once. By deploying the antenna once and then moving the receiving antenna to receive signals from different locations, the shielding effectiveness testing of devices in confined spaces can be completed efficiently, significantly improving testing efficiency.

[0006] To solve the technical problem, the technical solution of this utility model is as follows:

[0007] A test antenna for magnetic field shielding effectiveness in confined spaces includes: a signal source, a magnetic field antenna preamplifier, a magnetic field signal transmitting antenna composed of multiple antenna loops, a flexible circuit board, a coaxial cable, a twisted pair cable, and a metal mesh.

[0008] The signal source is connected to the magnetic field antenna preamplifier. The magnetic field antenna preamplifier transmits the signal to the antenna rings via a coaxial cable. The antenna rings are all fixed by flexible boards. The antenna rings are connected by twisted pairs of wire wrapped with metal mesh.

[0009] Compared with the prior art, the advantages of this utility model are:

[0010] When used in conjunction with a magnetic field signal transmitter, the signal is provided to the magnetic field antenna through the magnetic field transmitter. The antenna transmits the signal to the required test location at once, so that different locations in a confined space can have a certain magnetic field signal at the same time. This achieves the effect of transmitting the signal once and receiving it at different test locations at the same time, or receiving it continuously by simply moving the antenna under test, which can greatly improve the efficiency of screen effect testing. Attached Figure Description

[0011] Figure 1 A system structure diagram of an antenna for testing the magnetic field shielding effectiveness in a confined space, according to this utility model;

[0012] Figure 2 Diagram showing the connection between the antenna ring and the flexible circuit board of this utility model. Detailed Implementation

[0013] The specific embodiments of this utility model are described below with reference to examples:

[0014] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0015] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0016] Example 1:

[0017] like Figure 1 and 2As shown, an antenna for testing the magnetic field shielding effectiveness in confined spaces involves fixing the loop of the magnetic field antenna to a flexible circuit board, ensuring the loop maintains a certain transmitting magnetic field. The flexible circuit board can be configured to the required length according to the needs of the device under test. Additionally, in areas not requiring testing, the antenna loop is twisted in half and wrapped with a metal mesh, then fixed back to the flexible circuit board before moving to the next testing location, ensuring a certain magnetic field is present at the tested area.

[0018] The signal is generated by a signal source, amplified by a preamplifier of a magnetic field antenna, and then connected to the first antenna loop via a coaxial cable. After the first antenna loop is set up, the signal transmission line of the loop antenna is twisted in half, the twisted half is wrapped with wire mesh, and then connected to the next test position and connected to the second loop. In this way, multiple loop antennas can be connected to form a closed loop antenna to provide the same signal to different positions of the magnetic field antenna, so as to achieve a set of signals covering all test positions.

[0019] In summary, this utility model is a magnetic field transmitting antenna that can interconnect N antenna rings and arrange them at different positions in a small test space at once, so as to realize the antenna arrangement in one go and improve the testing efficiency.

[0020] Example 2:

[0021] This embodiment provides a specific system structure for testing the magnetic field shielding effectiveness of an antenna in a confined space, including:

[0022] Signal source: As the starting point of the system, the signal source generates a magnetic field signal of a specific frequency to provide a signal for the subsequent transmission of magnetic field signals.

[0023] Magnetic field antenna preamplifier: amplifies the signal generated by the signal source and transmits it to the antenna loop. The magnetic field signal emitted by this antenna loop will be used for shielding effectiveness testing.

[0024] Coaxial cable: A coaxial cable is used to transmit the signal from the signal source to the input of the preamplifier of the magnetic field antenna. After the signal is amplified, the coaxial cable is used again to transmit the amplified signal from the output of the preamplifier to the first antenna loop of the magnetic field antenna. The advantage of coaxial cable lies in its excellent shielding properties, which can effectively prevent signal loss and interference during transmission.

[0025] Installation of the first antenna loop: Position the first loop antenna at the designated test location to ensure that it can effectively transmit magnetic field signals.

[0026] Use of twisted-pair cable: After the first antenna loop is installed, the twisted-pair section on the signal transmission line (such as a coaxial cable) is used to connect to the next test location. In this part of the design, the twisted-pair cable structure effectively reduces external interference.

[0027] Metal mesh wrapping: The twisted pair is wrapped with wire mesh. This layer of shielding can further enhance signal quality and reduce interference with the surrounding environment.

[0028] Connect the second antenna loop: Connect the second antenna loop to the other end of the twisted pair. Repeat the above steps to continue connecting more antenna loops, forming a closed-loop antenna network.

[0029] Constructing a closed-loop design: Through this series of connections, multiple loop antennas can be interconnected to form a closed-loop magnetic field signal transmission system. This allows testing to be conducted in different locations, ensuring broad and consistent signal coverage.

[0030] Flexible printed circuit boards (FPCBs) play a crucial role in testing solutions. The following are the specific uses and functions of FPCBs throughout the testing process:

[0031] Antenna ring fixing:

[0032] The flexible printed circuit board (FPCB) forms the basis for the antenna loop. The antenna loop is fixed to the FPCB, providing a stable mounting method that ensures the antenna loop's position remains unchanged during testing, thus enabling continuous transmission of magnetic field signals.

[0033] Flexible layout:

[0034] Because of its flexibility, the flexible printed circuit board (FPCB) can be bent and adjusted to fit specific needs, making it easy to adapt to various testing environments, even in confined spaces. For devices of different shapes and sizes, the flexibility of the FPCB allows for easier antenna placement.

[0035] Simplified connection:

[0036] Flexible printed circuit boards (FPCBs) can integrate multiple circuits and connection points, reducing the complexity of using separate cables and making wiring between signal sources and multiple antenna loops simpler and neater. This reduces the likelihood of clutter and errors during measurement.

[0037] Supports twisted pair cables:

[0038] The metal mesh wrapped around the twisted pair can also be fixed with a flexible board to ensure the neatness and effectiveness of the signal transmission line when connected to different antenna loops, avoiding poor contact or signal interference.

[0039] Ease of maintenance and replacement:

[0040] If an antenna ring needs to be replaced, a simple replacement can be made at the connection point on the flexible circuit board without rewiring, thus improving testing efficiency.

[0041] The primary function of the flexible printed circuit board (FPCB) is to fix and support the antenna loop, while also providing flexible arrangement options and simplifying signal transmission line connections. These characteristics make testing magnetic field shielding effectiveness in confined spaces more efficient and convenient.

[0042] It is understood that this utility model has the following features and advantages:

[0043] Scalability: This design allows you to increase the number of loop antennas as needed to suit the requirements of different test locations.

[0044] Effective signal transmission: By combining coaxial cable and twisted pair, signal integrity can be maintained and interference can be effectively reduced.

[0045] Flexibility: The entire system can be adjusted according to actual measurement conditions, providing a flexible solution for testing in confined spaces.

[0046] High-efficiency testing: By deploying multiple ring antennas at once, testing efficiency can be improved, and manual operation and time costs can be reduced.

[0047] Example 3:

[0048] This embodiment provides a test procedure for an antenna used to test the magnetic field shielding effectiveness in confined spaces, specifically including the following steps:

[0049] Preparation phase:

[0050] Determine the device under test and its operating status.

[0051] Based on the testing requirements, design the number and placement of antenna loops. Prepare components such as signal source, magnetic field antenna preamplifier, coaxial cable, twisted pair cable, and metal mesh.

[0052] Equipment layout:

[0053] Arrange the flexible printed circuit board in a confined space according to the designed configuration to ensure that each antenna loop can effectively transmit signals and make contact with the device under test.

[0054] Fix the first loop antenna to the flexible board to ensure its stable position and proper transmission of magnetic field signals.

[0055] Signal connection:

[0056] Connect the signal source to the first antenna loop using a coaxial cable. Ensure all connections are secure and tight to avoid signal loss.

[0057] Twisted pair connection:

[0058] After the first antenna loop is installed, part of the signal transmission line is converted to twisted pair to reduce interference during signal transmission.

[0059] Wrap this end of the twisted pair with wire mesh to enhance shielding, and then connect it to the next location to be tested.

[0060] Second antenna ring installation:

[0061] Install the second antenna loop at the second test location. Ensure the loop is secure again, and connect the wrapped twisted-pair cable to the second loop.

[0062] Repeat the steps:

[0063] Add more antenna loops as needed. After installing each antenna loop, repeat the twisted-pair and wrapping steps to ensure a stable connection at each test point.

[0064] Signal transmission and monitoring:

[0065] Start the signal source and begin transmitting the magnetic field signal. Monitor the signal output of each loop antenna to ensure that the signal strength and quality at each location meet the test standards.

[0066] The coverage of the magnetic field is assessed based on signal strength and effectiveness.

[0067] Data collection and analysis:

[0068] Record the signal strength and quality data of each loop antenna at different locations, and then compare and analyze them.

[0069] Based on the collected data, the magnetic field shielding effectiveness of the device under test at different locations is evaluated.

[0070] Summary and Report:

[0071] Organize the test results, write the test report, and summarize the problems found and improvement suggestions during the testing process.

[0072] If necessary, propose follow-up improvement plans or suggestions for retesting.

[0073] This testing process ensures accurate testing of magnetic field performance through scientific and orderly steps, and improves detection efficiency by deploying multiple antenna rings at once.

[0074] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0075] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. An antenna for testing the magnetic field shielding effectiveness in confined spaces, characterized in that, include: Signal source, magnetic field antenna preamplifier, magnetic field signal transmitting antenna consisting of multiple antenna loops, flexible circuit board, coaxial cable, twisted pair cable and metal mesh; The signal source is connected to the magnetic field antenna preamplifier. The magnetic field antenna preamplifier transmits the signal to the antenna rings via a coaxial cable. The antenna rings are all fixed by flexible boards. The antenna rings are connected by twisted pairs of wire wrapped with metal mesh.

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