Electronic equipment shell structure shielding effectiveness test system

Abstract

The utility model discloses a shielding effectiveness test system for an electronic equipment shell structure. An upper computer module is respectively connected with a signal generation module and a signal receiving module; the signal generation module is connected with the transmitting antenna; the receiving antenna is connected with the signal receiving module, and the signal generating module comprises a power amplifier, a first signal generator, a second signal generator and an amplitude multiplication modulator; the first signal generator and the second signal generator respectively receive electric signals sent by the upper computer module, respectively generate a modulation signal and a carrier signal, and transmit the modulation signal and the carrier signal to the amplitude multiplication modulator; the amplitude multiplication modulator receives the modulation signal and the carrier signal and outputs a pulse modulation signal to the power amplifier; and the power amplifier amplifies the pulse modulation signal and transmits the pulse modulation signal to a transmitting antenna. According to the scheme of the utility model, the shielding effectiveness test is carried out by using the modulated pulse modulation signal, which is closer to the use environment of the actual working state, so that the result of the shielding effectiveness test is more accurate.

Description

Technical Field

[0001] The utility model belongs to the field of electromagnetic compatibility and electromagnetic shielding effectiveness, and in particular relates to a shielding effectiveness testing system for an electronic equipment shell structure. Background Art

[0002] With the rapid development of electronic equipment functions and applications in recent years, the number and variety of electronic devices in equipment have reached unprecedented levels. Electromagnetic compatibility testing standards clearly define maximum limits for radiated emissions from electronic equipment. Electromagnetic shielding is one of the primary means by which electronic equipment can suppress electromagnetic interference. Due to safety and structural strength requirements, some electronic product housings are often made of metal. Electromagnetic principles show that a material's electromagnetic shielding capability is related to its conductivity. Common metals generally have higher electrical conductivity, resulting in stronger electromagnetic shielding capabilities. With advancements in material production and processing technologies, composite materials are increasingly being used in electromagnetic shielding, even partially replacing sheet metal as the primary component of electronic device housings. Furthermore, the shielding properties of composite materials with different structures differ from those of pure composite flat panels. Recent research and field testing have also revealed that different modulation waveforms can have different sensitivity characteristics to a device. While shielding characteristics are simply considered in the frequency domain, the introduction of modulation signals allows for a more intuitive and effective assessment of the shielding capabilities of composite structured products.

[0003] Shielding effectiveness is a key indicator of a material's or structure's electromagnetic shielding capabilities. From a computational electromagnetics perspective, understanding a material's key electromagnetic parameters, such as conductivity (σ), dielectric constant (ε), and magnetic permeability (μ), allows calculation of the shielding effectiveness of the material or structure through simulation modeling and application scenarios. However, in actual research and production, accurate material electromagnetic parameters cannot be obtained, or the material's complex load conditions and application scenarios complicate simulation modeling. Therefore, experimental testing remains an irreplaceable means of shielding effectiveness assessment.

[0004] However, existing shielding effectiveness measurements generally use a single-frequency sine wave to evaluate shielding effectiveness. This is somewhat convincing for the evaluation of a single material, but rarely evaluates different types of modulated signals. Summary of the Invention

[0005] In order to solve the above technical defects in the prior art, the present invention proposes a shielding effectiveness testing system for an electronic device housing structure.

[0006] The technical solutions to achieve the purpose of this utility model are:

[0007] A shielding effectiveness test system for an electronic device housing structure includes a host computer module, a signal generating module, a signal receiving module, a transmitting antenna, and a receiving antenna;

[0008] The host computer module is connected to the signal generating module and the signal receiving module respectively;

[0009] The signal generating module is connected to the transmitting antenna;

[0010] The receiving antenna is connected to the signal receiving module.

[0011] Furthermore, the host computer module includes a host computer and an Ethernet switch;

[0012] The host computer is used to receive external control instructions and transmit the electrical signals of the instructions to the signal generating module and the signal receiving module respectively through the Ethernet switch.

[0013] Furthermore, the signal generating module includes a power amplifier, a first signal generator, a second signal generator and an amplitude multiplication modulator;

[0014] The first signal generator and the second signal generator respectively receive the electrical signals sent by the host computer module, respectively generate a modulation signal and a carrier signal, and transmit them to the amplitude multiplication modulator;

[0015] The amplitude multiplication modulator receives a modulation signal and a carrier signal, and outputs a pulse modulation signal to a power amplifier;

[0016] The power amplifier amplifies the pulse modulated signal and transmits the amplified signal to a transmitting antenna.

[0017] Furthermore, the first signal generator is a low-frequency function signal generator;

[0018] The second signal generator is a high-frequency signal generator.

[0019] Furthermore, the amplitude multiplication modulator performs a multiplication operation on the modulation signal and the carrier signal based on a multiplier, thereby achieving the output of a pulse modulation signal.

[0020] Compared with the prior art, the present invention utilizes a modulated pulse modulation signal to perform shielding effectiveness testing, which is closer to the use environment of an actual working state and makes the shielding effectiveness test result more accurate.

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the electronic equipment housing structure shielding effectiveness testing system measuring the housing model in an embodiment of the present utility model.

[0023] Figure 2Schematic diagram of the shielding effectiveness test system for electronic equipment housing structure in the embodiment of the present invention measuring the housing model after removal

[0024] Figure 3 This is a schematic diagram of the results of shielding effectiveness measurement based on the system of this solution in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] It is easy to understand that, based on the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can imagine a variety of implementation methods of the present invention. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or limitation of the technical solution of the present invention. On the contrary, the purpose of providing these embodiments is to enable those skilled in the art to understand the present invention more thoroughly. The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the innovative concept of the present invention.

[0026] Example

[0027] Combine Figure 1 or Figure 2 , an electronic equipment housing structure shielding effectiveness test system, including a host computer module, a signal generating module, a signal receiving module, a transmitting antenna and a receiving antenna;

[0028] The host computer module is connected to the signal generating module and the signal receiving module respectively for receiving external instructions

[0029] The signal generating module is connected to the transmitting antenna;

[0030] The receiving antenna is connected to the signal receiving module.

[0031] The host computer module includes a host computer and an Ethernet switch;

[0032] The host computer module is used to receive external control instructions and transmit the electrical signals of the instructions to the signal generating module and the signal receiving module respectively through the Ethernet switch;

[0033] The signal generating module is used to generate a modulated RF signal, the signal receiving module is used to receive the RF signal, the transmitting antenna is used to radiate the RF signal generated by the signal generating module into space, and the receiving antenna is used to receive the RF signal radiated in space and transfer the signal energy to the signal receiving module.

[0034] The signal generating module includes a power amplifier, a first signal generator, a second signal generator and an amplitude multiplication modulator;

[0035] The first signal generator and the second signal generator respectively receive the electrical signals sent by the host computer module, respectively generate a modulation signal and a carrier signal, and transmit them to the amplitude multiplication modulator;

[0036] The amplitude multiplication modulator receives a modulation signal and a carrier signal, and outputs a pulse modulation signal to a power amplifier;

[0037] The power amplifier amplifies the pulse modulated signal and transmits the amplified signal to a transmitting antenna.

[0038] The control instructions received by the host computer include parameters such as the center frequency of the carrier signal and the frequency and duty cycle of the modulated signal, and parameters such as the scanning rate and scanning step corresponding to the signal generating module and the signal receiving module;

[0039] The first signal generator is a low-frequency function signal generator;

[0040] The second signal generator is a high-frequency signal generator.

[0041] The amplitude multiplication modulator is a circuit hardware used for signal synthesis. It performs multiplication operations on the modulation signal and the carrier signal based on the multiplier, modulates the low-frequency signal into a high-frequency signal, and thus realizes the output of the pulse modulated signal. The modulation principle is amplitude modulation. The modulated signal has a certain high-frequency duty cycle characteristic, which is closer to the electromagnetic physical environment used in the actual product.

[0042] When using this test system, you only need to press Figure 1 and Figure 2 The electronic equipment is measured respectively in two forms, and the host computer in the host computer module can obtain the shielding effectiveness of the electronic equipment according to the measurement results.

[0043] Figure 3 This is a schematic diagram of the shielding effectiveness measurement results in an embodiment of this scheme. This scheme uses a modulated pulse modulation signal to perform shielding effectiveness testing, which is closer to the actual working environment and makes the shielding effectiveness test results more accurate.

[0044] The above embodiments illustrate and describe the basic principles and main features of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. A shielding effectiveness test system for electronic equipment housing structure, characterized in that: It includes a host computer module, a signal generating module, a signal receiving module, a transmitting antenna and a receiving antenna; The host computer module is connected to the signal generating module and the signal receiving module respectively; The signal generating module is connected to the transmitting antenna; The receiving antenna is connected to the signal receiving module; The host computer module includes a host computer and an Ethernet switch; The host computer is used to receive external control instructions and transmit the electrical signals of the instructions to the signal generating module and the signal receiving module respectively through the Ethernet switch; The signal generating module includes a power amplifier, a first signal generator, a second signal generator and an amplitude multiplication modulator; The first signal generator and the second signal generator respectively receive the electrical signals sent by the host computer module, respectively generate a modulation signal and a carrier signal, and transmit them to the amplitude multiplication modulator; The amplitude multiplication modulator receives a modulation signal and a carrier signal, and outputs a pulse modulation signal to a power amplifier; The power amplifier amplifies the pulse modulated signal and transmits it to the transmitting antenna; The first signal generator is a low-frequency function signal generator; The second signal generator is a high-frequency signal generator.

2. The electronic equipment housing structure shielding effectiveness testing system according to claim 1, characterized in that: The amplitude multiplication modulator performs a multiplication operation on the modulation signal and the carrier signal based on a multiplier, thereby achieving the output of a pulse modulation signal.

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