Low noise amplifier and electromagnetic compatibility test device

Abstract

The present invention relates to a low noise amplifier and an electromagnetic compatibility testing device. The low noise amplifier comprises: a containing box body, which is provided with a first opening and a second opening; an amplifier module, which is contained in the containing box body, and the amplifier module has an input port and an output port, the input port can be connected to the outside of the containing box body through the first opening, and the output port can be connected to the outside of the containing box body through the second opening; the containing box body is also provided with a connecting hole to install the containing box body. Technical effect: Compared with a separately placed low noise amplifier, the low noise amplifier provided by the present technical solution can be directly installed on the antenna bracket by using the connecting hole on the containing box body, which is closer to the antenna module, and can achieve good noise reduction effect, greatly reduce the noise caused by line attenuation and antenna factor, and can also shorten the radio frequency cable. At the same time, the connecting hole on the containing box body is more convenient for installation and disassembly operations.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic compatibility radiation disturbance testing, and in particular to a low noise amplifier and an electromagnetic compatibility testing device. Background Art

[0002] The electromagnetic compatibility radiation interference test is used to detect the electromagnetic compatibility of the device under test, so as to obtain a device under test with good electromagnetic compatibility. The electromagnetic compatibility radiation interference test equipment mainly includes antennas, cables, receivers, etc. The test result is equal to the measured value of the receiver plus the line attenuation and antenna factor. Since the line attenuation and antenna factor are large and proportional to the frequency, if measured directly, the test result will be higher than the test limit, and the interference signal to be tested cannot be measured. The addition of a low noise amplifier can effectively solve this problem and play a role in noise reduction.

[0003] In traditional electromagnetic compatibility radiated disturbance test equipment, a low noise amplifier is usually connected to an antenna via a radio frequency line, and then connected to a receiver via another radio frequency line.

[0004] In the process of implementing traditional technology, the inventors found that the traditional low-noise amplifier cannot achieve a good noise reduction effect. Summary of the invention

[0005] Based on this, it is necessary to provide a low noise amplifier and an electromagnetic compatibility test device to address the problem that traditional low noise amplifiers cannot achieve a good noise reduction effect.

[0006] The present invention provides a low-noise amplifier, comprising: a containing box body, provided with a first opening and a second opening; an amplifier module, contained in the containing box body, the amplifier module having an input port and an output port, the input port being connectable to the outside of the containing box body through the first opening, the output port being connectable to the outside of the containing box body through the second opening; the containing box body is also provided with a connecting hole for installing the containing box body.

[0007] The above technical solution has at least the following technical effects: In the low-noise amplifier provided by the present technical solution, the amplifier module is placed in a containing box body, and the containing box body can be installed on other components by using the connection holes on the containing box body. In particular, for electromagnetic compatibility radiation interference testing, the containing box body can be installed on the antenna bracket. Compared with a separately placed low-noise amplifier, the low-noise amplifier provided by the present technical solution can be directly installed on the antenna bracket, which is closer to the antenna module, and can achieve good noise reduction effects, greatly reducing the noise caused by line attenuation and antenna factors, and can also shorten the RF cable. At the same time, the connection holes on the containing box body are more convenient for installation and disassembly operations. In addition, the first opening and the second opening on the containing box body facilitate connecting the input port and the output port of the low-noise amplifier to the antenna module and the measurement module, respectively.

[0008] In one embodiment, the input port passes through the first opening and extends out of the receiving box.

[0009] In one embodiment, the output port is accommodated in the accommodating box body, and the second opening has a hole wall extending out of the outer wall of the accommodating box body.

[0010] In one embodiment, the housing box is provided with a pair of symmetrical connection holes, and the connection holes avoid the amplifier module.

[0011] In one of the embodiments, a battery module electrically connected to the amplifier module is further disposed in the housing box.

[0012] In one of the embodiments, a button switch for controlling whether the battery module supplies power is disposed outside the housing box, and an indicator light for displaying the power level of the battery module is also disposed outside the housing box.

[0013] In one embodiment, the battery module includes a rechargeable battery, and a charging interface is provided outside the housing box; or, the battery module includes a disposable battery.

[0014] In one embodiment, the amplifier module and the battery module are spaced apart and are both locked to the inner wall of the accommodating box.

[0015] In one embodiment, the amplifier module is disposed on the battery module and locked to the battery module, and the battery module is locked to the inner wall of the accommodating box.

[0016] The present invention also provides an electromagnetic compatibility testing device, comprising: an antenna bracket; a low-noise amplifier as described in any of the above items, installed on the antenna bracket through the connecting hole; an antenna module, fixed to the antenna bracket and electrically connected to the input port through a first radio frequency cable; and a measuring module, electrically connected to the output port through a second radio frequency cable.

[0017] The above technical solution has at least the following technical effects: the electromagnetic compatibility test device provided by this technical solution adopts a low-noise amplifier as described in any of the above items, and the amplifier module is placed in a containing box body. The containing box body can be installed on the antenna bracket by using the connection holes on the containing box body. Compared with a separately placed low-noise amplifier, the low-noise amplifier used in this technical solution can be directly installed on the antenna bracket, which is closer to the antenna module, and can achieve a good noise reduction effect, greatly reducing the noise caused by line attenuation and antenna factors, and can also shorten the RF cable. At the same time, the connection holes on the containing box body are more convenient for installation and disassembly operations. In addition, the first opening and the second opening on the containing box body facilitate connecting the input port and the output port of the low-noise amplifier to the antenna module and the measurement module, respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a low noise amplifier according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 The structural schematic diagram of the containing box body shown;

[0020] Figure 3 for Figure 1 The schematic diagram of the structure of the amplifier module shown;

[0021] Figure 4 for Figure 1 A schematic diagram of the structure of the battery module shown;

[0022] Figure 5 The figure is a schematic diagram of the structure of an electromagnetic compatibility testing device according to an embodiment of the invention.

[0023] in:

[0024] 100, low noise amplifier 110, housing 112, first opening

[0025] 114, second opening 116, connection hole 118, charging interface

[0026] 120, amplifier module 122, input port 124, output port

[0027] 130, battery module 140, button switch 150, indicator light

[0028] 200, electromagnetic compatibility testing device 210, antenna bracket 212, first bracket

[0029] 214, second bracket 216, third bracket 220, antenna module

[0030] 232, first radio frequency cable 234, second radio frequency cable 240, measurement module DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] In traditional electromagnetic compatibility radiation interference tests, a low noise amplifier is usually set on the ground or on an operating table, and connected to an antenna module fixed to an antenna bracket using a radio frequency cable, and the antenna module is subjected to noise reduction processing to reduce the influence of line attenuation and antenna factor. The inventors have found that such a low noise amplifier cannot effectively reduce noise. After repeated tests, it is found that the noise reduction effect is affected by the distance between the low noise amplifier and the antenna module. Without affecting the proportion of line attenuation and antenna factor in the test results, when the low noise amplifier is closer to the antenna module, the noise reduction effect will be improved.

[0035] To do this, refer to Figure 1An embodiment of the present invention provides a low noise amplifier 100, comprising: a containing box body 110, which is provided with a first opening 112 and a second opening 114; an amplifier module 120, which is accommodated in the containing box body 110, and the amplifier module 120 has an input port 122 and an output port 124, the input port 122 can be connected to the outside of the containing box body 110 through the first opening 112, and the output port 124 can be connected to the outside of the containing box body 110 through the second opening 114, that is, the input port 122 and the output port 124 are connected to other components outside the containing box body 110 through the first opening 112 and the second opening 114 respectively; the containing box body 110 is also provided with a connecting hole 116 for installing the containing box body 110, that is, the containing box body is installed on the antenna bracket through the connecting hole 116, so as to achieve the purpose of installing the low noise amplifier 100 on the antenna bracket, so as to shorten the distance between the low noise amplifier 100 and the antenna module.

[0036] It should be noted that the low noise amplifier 100 provided in the embodiment of the present invention can be applied to electromagnetic compatibility radiation disturbance testing, and can reduce noise while being easy to install. However, it can also be applied to other places where the low noise amplifier 100 needs to be installed, and can be portable by taking advantage of its easy installation characteristics. The housing box 110 can be made of metal, non-metal, or alloy, as long as it has no adverse effect on the test results. The "bottom" mentioned in this article refers to Figure 1 and Figure 5 Placement shown.

[0037] Traditional low noise amplifiers generally consist of only amplifier modules, which are placed on the ground or on an operating table. Figure 2 and Figure 3, and the low noise amplifier 100 provided in the embodiment of the present invention includes an amplifier module 120 and a housing 110 for accommodating the amplifier module 120. The amplifier module 120 has an input port 122 and an output port 124, the input port 122 can be electrically connected to the antenna module, and the output port 124 can be electrically connected to the measurement module (receiver or spectrum analyzer, etc.) to achieve electromagnetic compatibility radiation interference test. The housing 110 is provided with a first opening 112, and a radio frequency cable can pass through the first opening 112 to connect the input port 122 and the antenna module; the housing 110 is also provided with a second opening 114, and another radio frequency cable can pass through the second opening 114 to connect the output port 124 and the measurement module. Alternatively, the input port 122 and the output port 124 extend out of the first opening 112 and the second opening 114, respectively, and then are connected to the antenna module and the measurement module through different radio frequency cables. In order to facilitate the installation of the housing box 110, a connection hole 116 is provided on the housing box 110. For example, an intermediate piece is passed through the connection hole 116 and suspended on the antenna bracket. The intermediate piece can be a rope or a hook, etc., to shorten the distance between the low noise amplifier 100 and the antenna module; or multiple connection holes 116 are provided, and the housing box 110 is erected on the antenna bracket by a rod, which can also achieve the effect of shortening the distance and facilitating installation. The length of the RF cable between the low noise amplifier 100 and the antenna module can be reduced to less than 20 cm. In the frequency range of 18 GHz to 40 GHz, the influence of line attenuation and antenna factor is greatly reduced, thereby achieving a better noise reduction effect and achieving a more accurate measurement effect.

[0038] The above technical solution has at least the following technical effects: In the low noise amplifier 100 provided by the present technical solution, the amplifier module 120 is contained in the containing box body 110, and the containing box body 110 can be installed on other components by using the connection hole 116 on the containing box body 110. In particular, for electromagnetic compatibility radiation interference testing, the containing box body 110 can be installed on the antenna bracket. Compared with the low noise amplifier placed separately, the low noise amplifier 100 provided by the present technical solution can be directly installed on the antenna bracket, which is closer to the antenna module, and can achieve good noise reduction effect, greatly reduce the noise caused by line attenuation and antenna factor, and can also shorten the RF cable. At the same time, the connection hole 116 on the containing box body 110 is more convenient for installation and disassembly operations. In addition, the first opening 112 and the second opening 114 on the containing box body 110 facilitate connecting the input port 122 and the output port 124 of the low noise amplifier 100 to the antenna module and the measurement module respectively.

[0039] In some embodiments, the input port 122 passes through the first opening 112 and extends out of the housing 110. In order to better lock and fix the position of the amplifier module 120 in the housing 110 and to facilitate the connection of the RF cable, the input port 122 has a certain length. The input port 122 passes through the first opening 112 and extends out of the housing 110, which plays a role in positioning the amplifier module 120. Bolts, screws or brackets are then used to lock the amplifier module 120 in the corresponding position to avoid shaking as much as possible. Similarly, the output port 124 can also pass through the second opening 114 and extend out of the housing 110 to further play a role in positioning.

[0040] Considering the volume of the amplifier module 120, in some other embodiments, the output port 124 is accommodated in the receiving box body 110, and the second opening 114 has a hole wall extending out of the outer wall of the receiving box body 110. In this embodiment, the output port 124 also has a certain length to facilitate wiring. Generally speaking, the volume of the amplifier module 120 is relatively small. If the input port 122 passes through the first opening 112 and extends out of the receiving box body 110, the output port 124 will basically be accommodated inside the receiving box body 110. In order to facilitate threading, the second opening 114 is set to have a hole wall extending out of the outer wall of the receiving box body 110. Of course, both the input port 122 and the output port 124 can be accommodated inside the receiving box body 110, as long as the amplifier module 120 is locked.

[0041] In some embodiments, the housing box 110 is provided with a pair of symmetrical connection holes 116, and the connection holes 116 avoid the amplifier module 120. Without affecting the amplifier module 120, there are no other obstacles between the pair of connection holes 116. During installation, the axes of the pair of connection holes 116 are parallel to the horizontal direction, and a transverse rod is used to pass through the pair of connection holes 116. An interference fit or bolt locking is used at two joints to achieve a tight fit, so that the housing box 110 is erected and locked to the transverse rod, and the transverse rod is fixed to the antenna bracket, thereby achieving the locking of the low noise amplifier 100 to the antenna bracket. Of course, in order to further prevent the low noise amplifier 100 from shaking, multiple pairs of connection holes 116 can also be provided, and multiple transverse rods are used to pass through the corresponding connection holes 116 respectively. In addition, the low noise amplifier 100 can be locked to the antenna bracket using insulating tape or rope.

[0042] refer to Figure 1 and Figure 4In some embodiments, a battery module 130 electrically connected to the amplifier module 120 is further provided in the housing 110. In this embodiment, the battery module 130 supplies power to the amplifier module 120, and there is no need to connect to an external power source at all times, which reduces the complexity of the operation, avoids interference with the test caused by the external power source, reduces fatigue damage caused by multiple plugging and unplugging of the power cord, and increases the service life of the amplifier module 120. The battery module 130 directly supplies power to the amplifier module 120, which is more convenient and saves the use of power cords.

[0043] Furthermore, a button switch 140 for controlling whether the battery module 130 supplies power is provided outside the housing 110, and an indicator light 150 for displaying the power level of the battery module 130 is also provided outside the housing 110. In order to improve safety, a button switch 140 for controlling whether the battery module 130 supplies power is provided outside the housing 110. When the button switch 140 is turned on, a test operation can be performed; when the button switch 140 is turned off, the test operation can be stopped. In order to obtain the power level of the battery module 130 in time, an indicator light 150 for displaying the power level of the battery module 130 is provided outside the housing 110. Different power levels can be indicated according to the color change of the indicator light 150, so that the operator can charge or replace the battery module 130 in time.

[0044] In some embodiments, the battery module 130 includes a rechargeable battery, and a charging interface 118 is provided outside the housing body 110. The battery module 130 uses a rechargeable battery, and the number of rechargeable batteries is determined according to the actual measurement requirements and the volume occupied. The rechargeable battery can be repeatedly charged multiple times, thereby increasing the service life of the battery module 130 and reducing the number of replacement and maintenance times. A charging interface 118 is also provided on the housing body 110, and the charger connects the rechargeable battery and the power supply via the charging interface 118 to facilitate charging the rechargeable battery. Of course, the battery module 130 can also use a disposable battery. After the old disposable battery is used up, it can be replaced with a new disposable battery in time to meet the demand for powering the amplifier module 120.

[0045] In some embodiments, the amplifier module 120 and the battery module 130 are arranged at intervals and are both locked to the inner wall of the container body 110. The amplifier module 120 and the battery module 130 are electrically connected by a power cord and are arranged at intervals. The amplifier module 120 is locked to the inner wall of the container body 110 by bolts, screws or L-shaped brackets, and the battery module 130 is also locked to the inner wall of the container body 110 by bolts, screws or L-shaped brackets. Since the battery module 130 is relatively large in size, it can be directly placed at the bottom of the container body 110, and then locked and limited by a limit bracket.

[0046] In other embodiments, the amplifier module 120 may also be disposed on the battery module 130 and locked to the battery module 130, and the battery module 130 may be locked to the inner wall of the receiving box 110. Since the volume of the amplifier module 120 is smaller than that of the battery module 130, the amplifier module 120 may be directly stacked on the battery module 130 and locked to the battery module 130 by bolts, screws or brackets, and then the battery module 130 may be locked to the inner wall of the receiving box 110 by bolts, screws or L-shaped brackets. Since the volume of the battery module 130 is relatively large, it may be directly placed on the bottom of the receiving box 110 and then locked and limited by a limiting bracket.

[0047] Please refer to Figure 5 An embodiment of the present invention further provides an electromagnetic compatibility testing device 200, comprising: an antenna bracket 210; a low noise amplifier 100 as described in any of the above items, installed on the antenna bracket 210 through a connecting hole 116; an antenna module 220, fixed to the antenna bracket 210, and electrically connected to the input port 122 through a first RF cable 232; a measurement module 240, electrically connected to the output port 124 through a second RF cable 234.

[0048] Specifically, the antenna bracket 210 includes a bracket group fixed to the ground, and the bracket group includes a first bracket 212 fixed to the ground, a second bracket 214 vertically fixed to the first bracket 212, and a third bracket 216 vertically fixed to the second bracket 214, that is, the third bracket 216 is a horizontal crossbar. The antenna module 220 is installed and fixed to the end of the third bracket 216. In the low noise amplifier 100, the container body 110 is provided with a pair of mutually symmetrical connecting holes 116, and the connecting holes 116 avoid the amplifier module 120, that is, there is no other obstacle between the pair of connecting holes 116, and the third bracket 216 passes through the pair of connecting holes 116 and fits tightly. For example, the third bracket 216 and the connecting hole 116 are tightly fitted by interference fit or by bolt locking at two joints, so that the container body 110 is locked to the third bracket 216 to avoid shaking in the horizontal direction. At the same time, the container body 110 is erected on the third bracket 216 by gravity and will not fall easily. The low noise amplifier 100 and the antenna module 220 are both installed on the third bracket 216. Compared with the low noise amplifier that is separately set on the ground, the distance between the low noise amplifier 100 and the antenna module 220 is greatly shortened, which can achieve a good noise reduction effect to a large extent, and shorten the length of the first radio frequency cable 232, which can be roughly reduced to less than 20 cm, saving the consumption of the first radio frequency cable 232 and reducing the testing cost. The connection hole 116 on the accommodating box body 110 is more convenient for the installation and disassembly operation of the low noise amplifier 100, and is convenient for maintenance. Of course, the third bracket 216 can also be set as a plurality of cross bars, and correspondingly, the connection holes 116 are also set as a plurality of pairs, which further realizes the locking of the low noise amplifier 100 and the third bracket 216, improves the installation reliability, and is not limited to the locking method of this embodiment.

[0049] In addition, the first opening 112 on the containing box body 110 facilitates the electrical connection between the input port 122 and the antenna module 220 through the first RF cable 232, and the second opening 114 facilitates the electrical connection between the output port 124 and the measuring module 240 through the second RF cable 234. The second opening 114 is generally opened at the bottom end of the containing box body 110 in the gravity direction to further shorten the length of the second RF cable 234. The measuring module 240 can be a receiver or a spectrum analyzer, which can greatly reduce the influence of line attenuation and antenna factor in the frequency range of 18 GHz to 40 GHz in conjunction with the low noise amplifier 100 and the antenna module 220, and achieve a more accurate measurement effect.

[0050] The above technical solution has at least the following technical effects: the electromagnetic compatibility test device 200 provided by the present technical solution adopts the low noise amplifier 100 as described in any of the above items, and the amplifier module 120 is placed in the containing box body 110. The containing box body 110 can be installed on the antenna bracket 210 by using the connection hole 116 on the containing box body 110. Compared with the low noise amplifier placed separately, the low noise amplifier 100 used in the present technical solution can be directly installed on the antenna bracket 210, which is closer to the antenna module 220, and can achieve good noise reduction effect, greatly reduce the noise caused by line attenuation and antenna factor, and can also shorten the RF cable. At the same time, the connection hole 116 on the containing box body 110 is more convenient for installation and disassembly operations. In addition, the first opening 112 and the second opening 114 on the containing box body 110 facilitate connecting the input port 122 and the output port 124 of the low noise amplifier 100 to the antenna module 220 and the measurement module 240 respectively.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electromagnetic compatibility testing device, characterized in that: include: Antenna bracket; A low noise amplifier, comprising a housing body and an amplifier module; The containing box body is provided with a first opening and a second opening; The amplifier module is accommodated in the accommodating box body, and the amplifier module has an input port and an output port, the input port passes through the first opening and extends out of the accommodating box body, the output port can be connected to the outside of the accommodating box body through the second opening, the output port is accommodated in the accommodating box body, and the second opening is opened at the bottom end of the accommodating box body in the gravity direction; the accommodating box body is also provided with a pair of mutually symmetrical connecting holes, the axes of the pair of connecting holes are parallel to the horizontal direction, the connecting holes avoid the amplifier module, the low noise amplifier is installed on the antenna bracket through the connecting holes, the antenna bracket includes a third bracket arranged horizontally, the third bracket passes through the pair of connecting holes, and is tightly matched with the connecting holes, wherein the third bracket and the connecting holes are tightly matched by interference fit or by bolt locking at two connections; An antenna module is fixed to the antenna bracket and is electrically connected to the input port through a first radio frequency cable, wherein the length of the first radio frequency cable is within 20 cm; a measuring module, electrically connected to the output port via a second radio frequency cable; A battery module electrically connected to the amplifier module is also disposed inside the housing box, a button switch for controlling whether the battery module supplies power is disposed outside the housing box, and an indicator light for displaying the power level of the battery module is also disposed outside the housing box; The battery module is placed at the bottom of the accommodating box body, the amplifier module is stacked on the battery module and locked to the battery module using bolts, screws or brackets, and then the battery module is locked to the inner wall of the accommodating box body using bolts, screws or L-shaped brackets.

2. The electromagnetic compatibility testing device according to claim 1, characterized in that: The second opening has a hole wall extending out of the outer wall of the accommodating box body.

3. The electromagnetic compatibility testing device according to claim 1, characterized in that: The battery module includes a rechargeable battery, and a charging interface is provided outside the housing box; or, the battery module includes a disposable battery.

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