System for radiation immunity testing
By integrating the signal generator, power amplifier, and antenna onto a rack and connecting them with short coaxial cables, the energy loss problem in the high-frequency range is solved, realizing a high-efficiency, low-cost radiated immunity testing system.
Patent Information
- Application Number
- CN202520289434.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-21
AI Technical Summary
In radiated immunity testing, coaxial cables have high losses in the high-frequency range, which leads to the need for high-power amplifiers, increasing the cost of the test system. Furthermore, long cable connections are complex and time-consuming.
Integrating the signal generator, power amplifier, and antenna into a single rack, using short coaxial cables for connection, reducing cable length, and incorporating adjustable brackets, this design is suitable for high-frequency testing.
By shortening the coaxial cable length, energy loss is reduced, dependence on high-power amplifiers is decreased, costs are saved, and system setup time is simplified.
Smart Images
Figure CN223597799U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the field of electromagnetic compatibility (EMC), and more particularly to a system for radiated immunity test. BACKGROUND
[0002] Radiated immunity test (RI or RS for short) is an important item in electromagnetic compatibility (EMC) test, which is used to evaluate the anti-interference ability of a device or system in an electromagnetic radiation environment, so as to ensure that the device can work normally in a complex electromagnetic environment. The radiated immunity test simulates the electromagnetic radiation that may be encountered in the actual working environment, and radiates the interference signal through an antenna into the space around the equipment under test (EUT) to form an electromagnetic field of a certain intensity. During the test, the device is exposed to electromagnetic fields of different frequencies and intensities to evaluate its performance under radiated interference. Through the radiated immunity test, on the one hand, the anti-interference ability of the device can be evaluated, and the weak link of the device at a specific frequency can be further found out and optimized, and on the other hand, the industry standard can be met to ensure that the device meets the international and domestic electromagnetic compatibility requirements.
[0003] The frequency range of the radiated immunity test can vary from low frequency range to high frequency range depending on the specific standard and application scenario. The radiated immunity test is usually carried out in a laboratory, especially in an anechoic chamber, to avoid external electromagnetic interference. The system for radiated immunity test can include control devices, signal generators, power amplifiers, antennas, etc., which are usually connected to each other through coaxial cables. The shielding layer of the coaxial cable can effectively prevent external electromagnetic interference from entering the internal signal transmission channel, and also prevent internal signal leakage. Therefore, coaxial cables are particularly suitable for radio frequency antennas used in radiated immunity tests, so that signal interference can be reduced and signal quality can be guaranteed.
[0004] For the low frequency range of the radiated immunity test, the loss of the coaxial cable is low, and not much energy is lost on the coaxial cable. But for the high frequency range of the radiated immunity test, the loss of the coaxial cable is high, and more energy is lost on the coaxial cable. Moreover, for the system for radiated immunity test, the total length of the coaxial cable can reach tens of meters, so the loss of the coaxial cable is very large at this time. Therefore, the system for radiated immunity test needs a large power amplifier to achieve a high field strength in the high frequency range, thereby greatly increasing the cost of establishing the test system. UTILITY MODEL CONTENT
[0005] Therefore, the purpose of the present disclosure is to provide a system for radiated immunity test, which can realize high frequency test without a large power amplifier, and thus is extremely cost-effective.
[0006] The present disclosure provides a system for radiated immunity test, comprising a signal generator, a power amplifier and an antenna, characterized in that the signal generator and the power amplifier are arranged on a common rack, which can be arranged in a test chamber for radiated immunity test; and the antenna is also arranged on the common rack and connected to the power amplifier by a coaxial cable during the test.
[0007] Therefore, in the system for radiated immunity test according to the present disclosure, since the signal generator, the power amplifier and the antenna are all arranged on the rack, the coaxial cable used for connecting the signal generator, the power amplifier and the antenna is very short, so that the attenuation / loss of the long coaxial cable at high frequency can be avoided. Therefore, the output power of the power amplifier can be saved, so that a small power amplifier can be used to save the cost of the system. In addition, since the signal generator, the power amplifier and the antenna are all "integrated" on the rack, the manual connection between these components is reduced, and the time for setting up the system is saved.
[0008] In some embodiments, the system further comprises a control device, which can be connected to the signal generator and the power amplifier by an optical fiber. Thus, the transmission of control signals can be realized.
[0009] In some embodiments, the rack comprises a cabinet, and the signal generator and the power amplifier are arranged in the cabinet. Thus, the influence of the signal generator and the power amplifier on the test can be reduced.
[0010] In some embodiments, in the cabinet, the power amplifier is arranged above the signal generator. Thus, the length of the required coaxial cable can be further shortened.
[0011] In some embodiments, the rack comprises a support, which extends beyond the cabinet in the vertical direction, and the antenna is arranged on the support above the cabinet. Thus, the installation of the antenna can be simply realized.
[0012] In some embodiments, the position and angle of the antenna relative to the support can be adjusted by an adjusting mechanism. Thus, the adjustment of the antenna can be simply realized in order to meet the setting requirements of the relevant EMC standards.
[0013] In some embodiments, the length of the coaxial cable 354 is not more than 3 meters. Thus, the attenuation / loss of the long coaxial cable, especially at high frequency, can be avoided.
[0014] In some embodiments, the rack has a movable mechanism. In this regard, in some embodiments, the movable mechanism is configured as a lockable roller. Thus, the movement and transportation can be facilitated in order to facilitate the establishment of the test system.
[0015] In some embodiments, the antenna is configured as a horn antenna. Thus, the system according to the present disclosure can be particularly suitable for high frequency test.
[0016] It can be seen that a mobile high-frequency radiation immunity test system is provided, which reduces energy loss by shortening the length of the coaxial cable used, so that a high-cost high-power amplifier can be avoided. In addition, an adjustable support is introduced for adjusting the antenna. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to make the above-mentioned objects, features and advantages of the present disclosure more apparent and understandable, a detailed description of the specific embodiments of the present disclosure will be given below with reference to the accompanying drawings. In the drawings:
[0018] Figure 1 a schematic diagram of a test chamber and a test system for radiation immunity test according to the prior art is shown;
[0019] Figure 2 a schematic diagram of a test chamber and a test system for radiation immunity test according to an embodiment of the present disclosure is shown;
[0020] Figure 3A a schematic perspective view of a cabinet according to an embodiment of the present disclosure is shown;
[0021] Figure 3B another schematic perspective view of a cabinet according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION
[0022] The present disclosure will be described below with reference to the accompanying drawings, which show several embodiments of the present disclosure. It should be understood, however, that the present disclosure can be presented in various different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and to fully inform those skilled in the art of the scope of protection of the present disclosure. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.
[0023] It should be understood that in all the drawings, the same reference numerals represent the same elements. In the drawings, the dimensions of certain features can be distorted for the sake of clarity.
[0024] It should be understood that the language used in the specification is only used to describe specific embodiments and is not intended to limit the present disclosure. Unless otherwise defined, all terms (including technical and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art. For the sake of brevity and / or clarity, well-known functions or constructions can not be described in detail.
[0025] As used in the specification, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. The terms “comprises,” “comprising,” “includes,” “including,” and “contains,” as used in the specification, mean that there are contained, but do not necessarily exclude, the presence of one or more additional features. The term “and / or” as used in the specification encompasses all possible combinations of one or more of the associated listed items. The terms “between,” “among,” and “between about” as used in the specification shall be interpreted to include the values of X and Y. The term “between about X and Y” as used in the specification means “between about X and about Y,” and the term “from about X to Y” as used in the specification means “from about X to about Y.”
[0026] In the specification, when it is said that an element is positioned “on,” “attached to,” “connected to,” “coupled to,” or “contacted” another element, etc., the element can be positioned directly on, attached to, connected to, coupled to, or contacted with the other element, or there can be intervening elements. In contrast, when it is said that an element is “directly on,” “directly attached to,” “directly connected to,” “directly coupled to,” or “directly contacted” another element, there can be no intervening elements. In the specification, when it is said that one feature is disposed “adjacent” to another feature, it can mean that the one feature has a portion that overlaps the adjacent feature or a portion that is positioned above or below the adjacent feature.
[0027] In the specification, spatially relative terms such as “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” and the like can be used for the purpose of explanation about a relationship between one feature and another feature in the drawings. It will be understood that the spatially relative terms encompass different orientations of the device in use or operation, depending on the position of the device in the orientation. For example, if a device is turned over, a feature that is described as “below” or “beneath” other features would then be oriented “above” the other features. The device can be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors will be interpreted accordingly.
[0028] As described above, a system for radiated immunity test can include a control device, a signal generator, a power amplifier, an antenna, etc., which are usually connected to each other through a coaxial cable. However, in a high frequency range, the loss of the coaxial cable is high due to factors such as skin effect, dielectric loss, radiation loss, and mismatch loss. In addition, the loss of the coaxial cable is also proportional to the length of the cable, and the longer the cable, the greater the loss.
[0029] Radiated immunity tests can be applied in the development and verification process of vehicle electromagnetic compatibility to ensure the electromagnetic compatibility performance of the vehicle in a complex electromagnetic compatibility environment. In the process of developing and verifying the electromagnetic compatibility of a vehicle, a radiated immunity test is usually performed on the vehicle to ensure that the vehicle has a certain level of electromagnetic compatibility. Figure 1A system 300 for a radiated immunity test of a vehicle is shown exemplarily. The system 300 can comprise a control device 310, a signal generator 320, a power amplifier 330, an antenna 340 in order to generate a field strength in a test chamber 100 for a radiated immunity test. The test chamber 100 can comprise a chamber door 110 and a cable interface 120. A device under test 200, e.g. a vehicle, can be arranged in the test chamber 100. The control device 310, the signal generator 320 and the power amplifier 330 are arranged outside the test chamber 100, while the antenna 340 is arranged inside the test chamber 100 in order to generate electromagnetic interference to the device under test 200. The power amplifier 330 is connected to the cable interface 120 in the test chamber 100 by a first coaxial cable 351 and in turn to the antenna 340 by a second coaxial cable 352. Here, as already mentioned before, the connection of the power amplifier 330 and the antenna 340 by the coaxial cables 351 and 352 can reduce signal interference and ensure signal quality, which is particularly suitable for radio frequency antennas used in radiated immunity tests.
[0030] In a radiated immunity test of a vehicle, the frequency range required by the test standard is very wide, e.g. from 100 kHz to 6 GHz, i.e. from a low frequency range up to a high frequency range. As known, the division of high frequency signals and low frequency signals is mainly based on the frequency range, but the specific division criteria can vary depending on the application field. In vehicle electromagnetic tests, the division of low frequency and high frequency signals is mainly based on the test frequency range and the application scenario. Low frequency tests mainly focus on magnetic field emission and conducted immunity from 10 kHz to 30 MHz, while high frequency tests cover radiated immunity and radiation emission from 30 MHz to 18 GHz.
[0031] For the low frequency range, the cable loss of the coaxial cables 351, 352 is low, and not too much energy is wasted on the coaxial cables. For the high frequency range, the cable loss of the coaxial cables 351, 352 is high, and more energy is wasted on the coaxial cables. Furthermore, since the power amplifier 330 is arranged outside the test chamber 100 and the antenna 340 is arranged inside the test chamber 100, based on the size of the test chamber 100, the total length of the coaxial cables 351, 352 can reach tens of meters, so the coaxial cables bring huge energy consumption. Therefore, in such a system for a radiated immunity test, a high-power power amplifier is required to achieve a high-level field strength in the high frequency range, which significantly increases the cost of the test system.
[0032] Based on the above knowledge, the present disclosure proposes a system for a radiated immunity test, in which the length of the coaxial cables is significantly reduced, so that the loss can be effectively reduced and the efficiency and reliability of high frequency signal transmission can be improved. Therefore, a cost-advantageous power amplifier with less power can be used, so that the cost of the test system can be reduced. Furthermore, the system can advantageously be configured to be mobile.
[0033] The system for radiated immunity testing according to the present disclosure can be used in any radiated immunity test and is particularly suitable for radiated immunity testing of vehicles.
[0034] The following is explained by way of example with reference to a system 300 for radiated immunity testing according to an embodiment of the present disclosure.
[0035] Reference is made to Figure 2 , Figure 2 A schematic diagram of a test chamber 100 for radiated immunity testing and a system 300 for radiated immunity testing according to an embodiment of the present disclosure is shown. The test chamber 100 can comprise a chamber door 110. A device under test 200, e.g. a vehicle, can be arranged in the test chamber 100. The system 300 for radiated immunity testing can comprise a signal generator 320, a power amplifier 330 and an antenna 340.
[0036] The signal generator 320 can be configured to generate a desired electrical signal and can be configured as any type of signal generator as required.
[0037] The power amplifier 330 can be configured to amplify the power of the input signal from the signal generator 320. Herein, the power amplifier 330 can in particular be configured as a high frequency power amplifier.
[0038] The antenna 340 is capable of converting electrical signals into electromagnetic waves (transmission) or electromagnetic waves into electrical signals (reception). The antenna 340 can be configured as an antenna suitable for different frequencies. Herein, the antenna 340 can in particular be configured as a horn antenna suitable for high frequencies.
[0039] According to some embodiments of the present disclosure, the signal generator 320 and the power amplifier 330 can be arranged on a common rack 360, which can be arranged into the test chamber 100 for radiated immunity testing. The antenna 340 can also be arranged on this common rack 360 and can be connected to the power amplifier 330 via a coaxial cable 354 when performing the test.
[0040] Since the signal generator 320 and the power amplifier 330 are arranged on a common rack 360, the length of the coaxial cable connecting the signal generator 320 and the power amplifier 330 can be negligible. Since the antenna 340 is also arranged on the common rack 360 when the test is performed, the coaxial cable 354 for connecting the power amplifier 330 and the antenna 340 is very short, only 1 to 2 meters long, so that the attenuation / loss of long coaxial cable, especially at high frequencies, can be avoided. Therefore, the output power of the power amplifier 330 can be saved, and a small power amplifier can achieve the required high-level field strength, so that the cost of the system 300 can be saved. In addition, since the signal generator 320, the power amplifier 330 and the antenna 340 are all "integrated" on the rack 360, the manual connection between these components is reduced, and the time for setting up the system is saved.
[0041] According to some embodiments of the present disclosure, optionally, with reference to Figure 2 The system 300 can further comprise a control device 310, which is capable of being connected with the signal generator 320 and the power amplifier 330 through the optical fiber 353. Thus the transmission of control signals can be realized.
[0042] The control device 310 can be implemented as any type of computing device, computing circuit or any type of processor or processing circuit capable of executing a series of instructions stored in a memory. The control device can comprise a plurality of processors and / or multi-core central processing units (CPUs) and can comprise any type of processor, such as a microprocessor, a digital signal processor, a microcontroller, etc. The control device can further comprise a memory to store data and / or algorithms to execute a series of instructions. The control device can also be implemented as a computer program product or a software product.
[0043] The control device 310 can have the functions of processing data, receiving data and sending data, and can include a server and a terminal establishing a communication connection with the server. Optionally, the server can be a single server, a server cluster composed of several servers or a distributed system, and can also be a cloud server providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDN), and basic cloud computing services such as big data and artificial intelligence platforms. The terminal can run an operating system, which can include but is not limited to an Android system, an IOS system, a Linux system, Unix, a Windows system, etc., and can also include a user interface (UI) layer, which can provide the display of data to the outside through the UI layer, and can also send data to the signal generator 320 and the power amplifier 330 based on an application programming interface (API), and receive data transmitted by the signal generator 320 and the power amplifier 330.
[0044] The control device 310 can be arranged in a separate control room (not shown).
[0045] According to some embodiments of the present disclosure, optionally, referring to Figure 3A and Figure 3B , the rack 360 can include a cabinet 361, and the signal generator 320 and the power amplifier 330 can be arranged in the cabinet 361. In this way, the influence of the signal generator 320 and the power amplifier 330 on the test can be reduced.
[0046] According to some embodiments of the present disclosure, optionally, referring to Figure 2 , in the cabinet 361, the power amplifier 330 can be arranged above the signal generator 320. In this way, the length of the required coaxial cable 354 can be further shortened.
[0047] According to some embodiments of the present disclosure, optionally, referring to Figure 3A and Figure 3B , the rack 360 can include a support 362, the support 362 extends beyond the cabinet 361 in the vertical direction, and the antenna 340 can be arranged on the support 362 above the cabinet 361. As shown, the support 362 can be configured as a support column. In this way, the installation of the antenna 340 can be simply realized.
[0048] According to some embodiments of the present disclosure, optionally, referring to Figure 3A and Figure 3BThe position and angle of the antenna 340 relative to the stand 362 can be adjusted by the adjusting mechanism 363. Thereby, the adjustment of the antenna 340 can be simply realized in order to meet the setting requirements of the relevant EMC standards.
[0049] According to some embodiments of the present disclosure, optionally, the length of the coaxial cable 354 is not more than 3 meters. When the length of the coaxial cable 354 is not more than 3 meters, the attenuation / loss of the long coaxial cable, especially at high frequencies, can be avoided.
[0050] According to some embodiments of the present disclosure, optionally, the length of the coaxial cable 354 is not more than 3 meters. When the length of the coaxial cable 354 is not more than 3 meters, the attenuation / loss of the long coaxial cable, especially at high frequencies, can be avoided. Figure 3A and Figure 3B The stand 360 can have a movable mechanism, for example, a lockable roller 364, so that the stand 360 can be moved inside or outside the test chamber 100 for the radiated immunity test. Thereby, the movement and transportation can be facilitated in order to establish the test system.
[0051] Therefore, for example, when the high frequency test is needed, the stand 360 with the signal generator 320 and the power amplifier 330 for high frequencies can be moved inside the test chamber 100, and the antenna 340 for high frequencies can be installed on the stand 360 to perform the high frequency test. When the low frequency test is performed, the stand 360 with the signal generator 320 and the power amplifier 330 for high frequencies can be moved outside the test chamber 100, and the low frequency test can be performed by using the signal generator and the power amplifier suitable for low frequencies located outside the test chamber 100.
[0052] According to some embodiments of the present disclosure, optionally, the antenna 340 can be configured as a horn antenna. The horn antenna is a kind of high frequency radio frequency antenna, which is widely used in radio frequency (RF) and microwave frequency band (such as 3 GHz to 300 GHz). It has high gain, narrow beam and good directivity. Thereby, the system 300 according to the present disclosure can be particularly suitable for high frequency test.
[0053] According to some embodiments of the present disclosure, particularly with reference to Figure 2 and Figure 3A , 3BThe present disclosure provides a system 300 for radiated immunity test, which comprises a control device 310, a signal generator 320, a power amplifier 330 and an antenna 340. The control device 310 is connected with the signal generator 320 and the power amplifier 330 through an optical fiber 353, the signal generator 320 is connected with the power amplifier 330 through a coaxial cable (not shown), and the power amplifier 330 is connected with the antenna 340 through a coaxial cable 354. During the test, the signal generator 320, the power amplifier 330 and the antenna 340 are all arranged on a rack 360. The rack 360 has a cabinet 361, a support 362, an adjusting mechanism 363 and a roller 364. The signal generator 320 and the power amplifier 330 are arranged in the cabinet 361 of the rack 360, and the antenna 340 is arranged on the support 362 of the rack 360. The position and angle of the antenna 340 relative to the support 362 can be adjusted by the adjusting mechanism 363.
[0054] During the radiated immunity test, the rack 360 carrying the signal generator 320, the power amplifier 330 and the antenna 340 can be arranged in the test room 100, so that the length of the coaxial cable 354 used can be significantly reduced, thereby avoiding the attenuation / loss of the long coaxial cable, especially at high frequencies, and saving the output power of the power amplifier 330. The required high-level field strength can be achieved by a small power amplifier, thereby saving the cost of building the system. Moreover, since the signal generator 320, the power amplifier 330 and the antenna 340 are integrated on the rack 360, the manual connection between the antenna 340 and the power amplifier 330 is reduced, thereby saving the time for setting up the test device. In addition, the height, polarization and angle of the antenna 340 can be adjusted to meet the setting requirements of the relevant EMC standards. The rack 360 is configured as a mobile rack to facilitate movement and transportation.
[0055] Although the exemplary embodiments of the present disclosure have been described, it should be understood that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in substance. Therefore, all changes and modifications are included in the scope of protection of the present disclosure defined by the claims. The present disclosure is defined by the appended claims, and equivalents of these claims are also included.
Claims
1. A system for radiated immunity testing comprising a signal generator (320), a power amplifier (330) and an antenna (340), characterized in that, The signal generator (320) and the power amplifier (330) are arranged on a common rack (360), which can be arranged in a test chamber (100) for radiated immunity tests; during the tests, the antenna (340) is also arranged on the common rack (360) and is connected to the power amplifier (330) via a coaxial cable (354).
2. The system of claim 1, wherein, The system further comprises a control device (310), which can be connected to the signal generator (320) and the power amplifier (330) via an optical fiber (353).
3. The system of claim 1, wherein, The rack (360) comprises a cabinet (361), in which the signal generator (320) and the power amplifier (330) are arranged.
4. The system of claim 3, wherein, In the cabinet (361), the power amplifier (330) is arranged above the signal generator (320).
5. The system of claim 3, wherein, The rack (360) comprises a support (362), which protrudes in the vertical direction beyond the cabinet (361), and the antenna (340) is arranged on the support (362) above the cabinet (361).
6. The system of claim 5, wherein, The position and angle of the antenna (340) relative to the support (362) can be adjusted by an adjusting mechanism (363).
7. The system of claim 1, wherein, The length of the coaxial cable (354) is not more than 3 meters.
8. The system of claim 1, wherein, The rack (360) has a movable mechanism.
9. The system of claim 8, wherein, The movable mechanism is configured as a lockable roller (364).
10. The system of claim 1, wherein, The antenna (340) is configured as a horn antenna.