WO2019114254A1 - 无源互调测试装置 - Google Patents

无源互调测试装置 Download PDF

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Publication number
WO2019114254A1
WO2019114254A1 PCT/CN2018/093637 CN2018093637W WO2019114254A1 WO 2019114254 A1 WO2019114254 A1 WO 2019114254A1 CN 2018093637 W CN2018093637 W CN 2018093637W WO 2019114254 A1 WO2019114254 A1 WO 2019114254A1
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passive intermodulation
transmission line
tester
under test
load
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PCT/CN2018/093637
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English (en)
French (fr)
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周波
李志东
陈蓓
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广州兴森快捷电路科技有限公司
深圳市兴森快捷电路科技股份有限公司
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Publication of WO2019114254A1 publication Critical patent/WO2019114254A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
    • G01R31/2822—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere of microwave or radiofrequency circuits

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  • the present invention relates to the field of testing technology, and in particular to a passive intermodulation testing device.
  • next-generation communication 5G
  • 5G communication will bring a huge number of device connections, data transmission speeds of up to 10Gbps, and need to use a higher spectrum range to meet the 5G data transmission requirements.
  • 5G will use 1GHz to 100GHz spectrum to improve data transmission efficiency.
  • PIM passive intermodulation
  • PCBs Printed circuit boards
  • FED-HORN feeders
  • multiplexers Printed circuit boards
  • a passive intermodulation test device includes a passive intermodulation tester and a first transmission line
  • the passive intermodulation tester is connected to one end of a line of the device to be tested through the first transmission line, and the other end of the line of the device to be tested is connected to a load;
  • the passive intermodulation tester transmits at least two carrier signals, and outputs the signal to the device under test through the first transmission line, where the passive intermodulation tester receives the device to be tested through the first transmission line. Passive intermodulation signal.
  • the passive intermodulation test apparatus further includes a second transmission line; and the other end of the line of the device under test is connected to the load through the second transmission line.
  • one end of the second transmission line is soldered to the other end of the line of the device under test, and the other end is connected to the load.
  • the second transmission line is a cable line, and the other end of the second transmission line is connected to the load through a first DIN interface.
  • the passive intermodulation test apparatus further includes the load, and the load is a low intermodulation load.
  • one end of the first transmission line is connected to the passive intermodulation tester, and the other end of the first transmission line is soldered to one end of the line of the device under test.
  • the first transmission line is a cable, and one end of the first transmission line is connected to the passive intermodulation tester through a second DIN interface.
  • the passive intermodulation test apparatus further includes a terminal connected to the passive intermodulation tester.
  • the passive intermodulation test apparatus further includes a shielding box, and the device to be tested is placed in the shielding box.
  • the device to be tested is a printed circuit board to be tested.
  • the device to be tested is placed between the passive intermodulation tester and the load, and the passive intermodulation tester is connected to the device under test through the first transmission line, and the carrier signal is transmitted to the first transmission line.
  • the remaining intermodulation interference signal can be fed back to the passive intermodulation tester through the first transmission line, which is convenient for testing, and the test structure is simple, and the signal is not required to be forwarded through a cumbersome device. To ensure fast and stable signal transmission, it can achieve fast and stable testing of passive intermodulation.
  • FIG. 1 is a schematic diagram of a passive intermodulation test apparatus of an embodiment
  • FIG. 2 is a schematic structural diagram of a passive intermodulation test apparatus according to another embodiment.
  • a passive intermodulation test apparatus of an embodiment including a passive intermodulation tester 110 and a first transmission line 120.
  • the passive intermodulation tester 110 is connected to the device under test 130 through the first transmission line 120. At one end of the line, the other end of the line of the device under test 130 is connected to the load 200.
  • the passive intermodulation tester 110 transmits at least two carrier signals, which are output to the device under test 130 through the first transmission line 120, and the passive intermodulation tester 110 receives the passive intermodulation signals returned by the device under test 130 through the first transmission line 120.
  • the passive intermodulation signal is an interference signal, that is, an interference signal generated by intermodulation between the carrier signals when at least two carriers are transmitted on the line of the device under test 130.
  • the passive intermodulation tester 110 is a special device capable of measuring intermodulation interference signals.
  • the passive intermodulation tester 110 can be a multi-band passive intermodulation tester 110, that is, a carrier signal of at least two frequency bands can be transmitted for interference detection.
  • At least two carrier signals are first transmitted through the passive intermodulation tester 110, and are output to the line of the device under test 130 through the first transmission line 120, and the other end of the line of the device under test 130 is responsible for the load. 200 receives the carrier signal.
  • modulation may occur between the signals, and the intermodulation interference signal, that is, the above-mentioned passive intermodulation signal, is generated, and the intermodulation interference signal on the line of the device under test 130 passes the first
  • the transmission line 120 sends the intermodulation interference signal to the passive intermodulation tester 110 to implement passive intermodulation testing of the line of the device under test 130.
  • the device under test 130 is placed between the passive intermodulation tester 110 and the load 200, and the passive intermodulation tester 110 is connected to the device under test 130 through the first transmission line 120, at least two The carrier signal is transmitted to the device under test 130 through the first transmission line 120. After the load 200 absorbs the carrier signal, the remaining intermodulation interference signal can be fed back to the passive intermodulation tester 110 through the first transmission line 120. It is easy to test, and the test structure is simple. It does not need to carry out signal forwarding through cumbersome devices, ensuring fast and stable signal transmission, and can realize fast and stable test of passive intermodulation.
  • the line of the device under test 130 may be a line composed of straight lines, which may be a curved line, or a line composed of a straight line and a curved line. Additionally, in one example, the number of carrier signals is two.
  • the device under test 130 may be a printed circuit board to be tested, and further may be a printed circuit board applied to a mobile communication related antenna or feeder. That is, the above-mentioned passive intermodulation test device is a passive intermodulation test device for a printed circuit board, and performs passive intermodulation test on the printed circuit board, and can select a qualified circuit board according to the passive intermodulation signal obtained by the test.
  • the passive intermodulation test apparatus further includes a second transmission line 140, and the other end of the line of the device under test 130 is connected to the load 200 through the second transmission line 140.
  • the other end of the line of the device under test 130 is directly connected to the load 200 through the second transmission line 140.
  • the carrier signal in the line of the device under test 130 can be quickly and stably absorbed by the load 200.
  • one end of the second transmission line 140 is soldered to the other end of the line of the device under test 130, and the other end of the second transmission line 140 is connected to the load 200.
  • one end of the second transmission line 140 By soldering one end of the second transmission line 140 to the other end of the line of the device under test 130, one end of the second transmission line 140 can be firmly connected to the other end of the line of the device under test 130 to avoid falling off and improve stability. It can avoid the problem that the existing size is not properly clamped when being clamped by the jig, so that it cannot be clamped and easily dropped.
  • the second transmission line 140 is a cable, and the other end of the second transmission line 140 is connected to the load 200 through the first DIN interface 141.
  • the second transmission line 140 selects the cable to be used, which improves the durability of the second transmission line 140 and is highly resistant to interference, so as to ensure stable and accurate transmission of the carrier signal to the load 200.
  • the other end of the second transmission line 140 is connected to the load 200 through the first DIN interface 141 to ensure accurate transmission of signals on the one hand, and the DIN interface is easy to plug and unplug on the other hand, facilitating the insertion and removal of the second transmission line 140, thereby facilitating the load. Replacement of 200.
  • the passive intermodulation test apparatus further includes a load 200, and the load 200 is a low intermodulation load.
  • the passive intermodulation test device further includes the above-mentioned load 200, and the load 200 is a low intermodulation load, so that the intermodulation interference of the load 200 can be reduced, and the feedback to the passive intermodulation tester 110 is ensured.
  • the intermodulation interference signal is an interference signal in the line of the device under test 130, thereby ensuring the accuracy of passive intermodulation detection of the line of the device under test 130.
  • one end of the first transmission line 120 is connected to the passive intermodulation tester 110, and the other end of the first transmission line 120 is soldered to one end of the line of the device under test 130.
  • one end of the first transmission line 120 can be firmly connected to one end of the line of the device under test 130 to avoid falling off and improve stability.
  • the first transmission line 120 is a cable, and one end of the first transmission line 120 is connected to the passive intermodulation tester 110 through the second DIN interface 121.
  • the first transmission line 120 selects the cable to be used, which can improve the durability of the first transmission line 120, and has strong anti-interference ability, so as to ensure stable and accurate transmission of the carrier signal to the line of the device under test 130 and ensure the line feedback of the device under test 130. Intermodulation of the accurate transmission of interference signals.
  • one end of the first transmission line 120 is connected to the passive intermodulation tester 110 through the second DIN interface 121 to ensure accurate transmission of signals on the one hand, and the DIN interface is easy to plug and unplug on the other hand, facilitating insertion and removal of the first transmission line 120. Therefore, the replacement of the passive intermodulation tester 110 is facilitated.
  • the passive intermodulation test apparatus further includes a terminal 150 coupled to the passive intermodulation tester 110.
  • the terminal 150 may include, but is not limited to, a display and a smart terminal 150.
  • the smart terminal 150 may include, but is not limited to, a computer terminal 150 and a mobile terminal.
  • the passive intermodulation tester 110 can transmit the received intermodulation interference signal to the terminal 150, and can display the intermodulation interference signal through the terminal 150, so that the detection personnel can observe the test result.
  • the passive intermodulation tester 110 can obtain a corresponding signal strength value (in dbm, decibel milliwatts), that is, a passive intermodulation value, according to the received intermodulation interference signal, and then transmit it to the terminal 150 for display, that is, The manner of the signal strength value is displayed on the terminal 150, which facilitates the inspection personnel to visually observe the test result.
  • the passive intermodulation test apparatus further includes a filter connected between the terminal 150 and the passive intermodulation tester 110.
  • a filter is provided between the terminal 150 and the passive intermodulation tester 110 for filtering out interference noise and transmitting The intermodulation of the terminal 150 interferes with the accuracy of the signal.
  • the passive intermodulation test device further includes a shielding box 160, and the device under test 130 is placed in the shielding box 160.
  • the shielding box 160 is further disposed.
  • the device to be tested 130 is placed in the shielding box 160, and the device to be tested 130 is isolated from the external connection to avoid External interference to improve test accuracy.
  • the passive intermodulation test apparatus further includes a test base for supporting the device under test 130.
  • the device under test 130 can be placed on the test base for testing, which is convenient for testing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

一种无源互调测试装置，包括无源互调测试仪（110）以及第一传输线（120），无源互调测试仪（110）通过第一传输线（120）连接待测设备（130）的线路的一端，待测设备（130）的线路的另一端连接负载（200）；无源互调测试仪（110）发射至少两个载波信号，通过第一传输线（120）输出至待测设备（130），无源互调测试仪（110）通过第一传输线（120）接收待测设备（130）返回的无源互调信号。即待测设备（130）置于无源互调测试仪（110）和负载（200）之间，且无源互调测试仪（110）通过第一传输线（120）与待测设备（130）连接，在负载（200）吸收载波信号后，通过第一传输线（120）即可实现将剩余的互调干扰信号反馈给无源互调测试仪（110），便于测试，且测试结构简单，无需通过繁琐的器件进行信号转发，确保信号快速稳定传输，即可实现无源互调的快速稳定测试。

Description

无源互调测试装置 技术领域
本发明涉及测试技术领域，特别是涉及一种无源互调测试装置。
背景技术
自20世纪80年代诞生蜂窝移动系统以来，无线通信的演进对于线路传输数据频率有着指数型的增长需求，1G通信解决了模拟语音通信的用户需求，2G解决了高质量数字语音通信和短信息通信的需求，3G通信解决的是窄带无线上网的用户需求，而4G通信解决的是宽带多媒体移动互联网的用户需求。随着万物互联的发展，预计下一代通信(5G)即将在2020年实现商业化。5G通信将带来海量的设备连接数量、高达10Gbps以上的数据传输速率，需要使用更高频谱范围来满足5G的数据传输需求，5G将会应用1GHz到100GHz的频谱来提升数据传输效率。
随着移动通信的飞速发展，通讯系统的发射功率和接收灵敏度都有进一步的提高，并且在同一传输信道内有可能存在很多不同频率的信号。在高功率条件下，一些原本认为具有线性特性的无源设备，例如：滤波器、双工器、接头、天线和传输电缆等，都表现出了非线性特性。因此，就有可能使不同频率的信号之间产生调制，即无源互调(Passive intermodulation，PIM)，又称互调失真，是由两个或多个频率的信号在无源器件中混合所产生的新的频率分量。
印刷线路板(PCB)已经广泛应用于移动通信相关的天线、馈电器(FEED-HORN，可将卫星天线所反射的讯号搜集导引入导波管)、多工器等器件中。随着5G通信的兴起，在高频的数据传输条件下，高端天线和未来5G天线均有对线路板无源互调PIM控制的要求以及目前对于天线器件生产商军队线路板的PIM值提出了越来越高的控制要求，然而，目前没有一种对线路板的PIM进行稳定测试的方法。
发明内容
基于此，有必要针对现有进行无源互调测试不稳定的问题，提供一种无源互调测试装置。
一种无源互调测试装置，包括无源互调测试仪以及第一传输线；
所述无源互调测试仪通过所述第一传输线连接待测设备的线路的一端，所述待测设备的线路的另一端连接负载；
所述无源互调测试仪发射至少两个载波信号，通过所述第一传输线输出至所述待测设备，所述无源互调测试仪通过所述第一传输线接收所述待测设备返回的无源互调信号。
在其中一个实施例中，上述无源互调测试装置，还包括第二传输线；所述待测设备的线路的另一端通过所述第二传输线连接所述负载。
在其中一个实施例中，所述第二传输线的一端与所述待测设备的线路的另一端焊接，另一端连接负载。
在其中一个实施例中，所述第二传输线为电缆线，第二传输线的另一端通过第一DIN接口连接所述负载。
在其中一个实施例中，上述无源互调测试装置，还包括所述负载，所述负载为低互调负载。
在其中一个实施例中，第一传输线的一端连接所述无源互调测试仪，所述第一传输线的另一端与所述待测设备的线路的一端焊接。
在其中一个实施例中，所述第一传输线为电缆线，第一传输线的一端通过第二DIN接口连接所述无源互调测试仪。
在其中一个实施例中，上述无源互调测试装置，还包括与所述无源互调测试仪连接的终端。
在其中一个实施例中，上述无源互调测试装置，还包括屏蔽箱，所述待测设备置于所述屏蔽箱内。
在其中一个实施例中，所述待测设备为待测印刷线路板。
上述无源互调测试装置，待测设备置于无源互调测试仪和负载之间，且无源互调测试仪通过第一传输线与待测设备连接，通过第一传输线将载波信号传 递给待测设备，在负载吸收载波信号后，通过第一传输线即可实现将剩余的互调干扰信号反馈给无源互调测试仪，便于测试，且测试结构简单，无需通过繁琐的器件进行信号转发，确保信号快速稳定传输，即可实现无源互调的快速稳定测试。
附图说明
图1为一实施例的无源互调测试装置的示意图；
图2为另一实施例的无源互调测试装置的结构示意图。
具体实施方式
如图1所示，提供一个实施例的无源互调测试装置，包括无源互调测试仪110以及第一传输线120，无源互调测试仪110通过第一传输线120连接待测设备130的线路的一端，待测设备130的线路的另一端连接负载200。无源互调测试仪110发射至少两个载波信号，通过第一传输线120输出至待测设备130，无源互调测试仪110通过第一传输线120接收待测设备130返回的无源互调信号。
可以理解，无源互调信号为干扰信号，即至少两个载波在待测设备130的线路上传输时各载波信号之间发生互调产生的干扰信号。随着移动通信的发展，对与移动通信相关的产品的互调干扰信号的检测要求也越来越高，无源互调测试仪110是一种可测量互调干扰信号的专用设备。具体地，该无源互调测试仪110可以为多频段无源互调测试仪110，即可以发射至少两个频段的载波信号进行干扰检测。
在本实施例中，首先通过无源互调测试仪110发射至少两个载波信号，且通过第一传输线120输出给待测设备130的线路，待测设备130的线路的另一端连接负责，负载200接收载波信号。然而，至少两个载波信号在线路上传输时，可能发生信号之间可能会发生调制，产生互调干扰信号即上述无源互调信号，待测设备130的线路上的互调干扰信号通过第一传输线120路将互调干扰信号反馈给无源互调测试仪110，实现对待测设备130的线路的无源互调测试。
上述无源互调测试装置，待测设备130置于无源互调测试仪110和负载200 之间，且无源互调测试仪110通过第一传输线120与待测设备130连接，至少两个载波信号通过第一传输线120将载波信号传递给待测设备130，在负载200吸收载波信号后，通过第一传输线120即可实现将剩余的互调干扰信号反馈给无源互调测试仪110，便于测试，且测试结构简单，无需通过繁琐的器件进行信号转发，确保信号快速稳定传输，即可实现无源互调的快速稳定测试。
在一个示例中，待测设备130的线路可以是由直线组成的线路，可以是为曲线线路，也可以是直线和曲线组成的线路。另外，在一个示例中，载波信号的数量为2。
在一个实施例中，待测设备130可以是待测印刷线路板，进一步地，可以是应用于移动通信相关的天线或馈电器的印刷线路板。即上述无源互调测试装置为对印刷线路板的无源互调测试装置，以对印刷线路板实现无源互调测试，根据测试获得的无源互调信号，可筛选合格的线路板。
在其中一个实施例中，上述无源互调测试装置，还包括第二传输线140，待测设备130的线路的另一端通过第二传输线140连接负载200。
即待测设备130的线路的另一端直接通过第二传输线140路与负载200连接，如此，待测设备130的线路中的载波信号可快速稳定地被负载200吸收。
在其中一个实施例中，第二传输线140的一端与待测设备130的线路的另一端焊接，第二传输线140的另一端连接负载200。
通过将第二传输线140的一端与待测设备130的线路的另一端焊接，使第二传输线140的一端可牢固地与待测设备130的线路的另一端连接，避免脱落，提高稳定性，还可避免现有通过夹具进行夹持时尺寸大小不合适导致无法夹稳容易掉落的问题。
在其中一个实施例中，第二传输线140为电缆线，第二传输线140的另一端通过第一DIN接口141连接负载200。
第二传输线140选择使用电缆线，可提高第二传输线140路的耐用性，抗干扰性强，以确保载波信号的稳定准确传输至负载200。另外，第二传输线140的另一端通过第一DIN接口141连接负载200，一方面确保信号的准确传输，另一方面，DIN接口易插拔，便于第二传输线140路的插拔，从而便于负载200 的更换。
在其中一个实施例中，上述无源互调测试装置，还包括负载200，负载200为低互调负载。
即在本实施例中，无源互调测试装置还包括上述负载200，且该负载200为低互调负载，如此，可减少负载200的互调干扰，确保反馈至无源互调测试仪110的互调干扰信号为待测设备130的线路中的干扰信号，从而确保对待测设备130的线路的无源互调检测的准确性。
在其中一个实施例中，第一传输线120的一端连接无源互调测试仪110，第一传输线120的另一端与待测设备130的线路的一端焊接。
通过将第一传输线120的另一端与待测设备130的线路的一端焊接，使第一传输线120的一端可牢固地与待测设备130的线路的一端连接，避免脱落，提高稳定性。
在其中一个实施例中，第一传输线120为电缆线，第一传输线120的一端通过第二DIN接口121连接无源互调测试仪110。
第一传输线120选择使用电缆线，可提高第一传输线120路的耐用性，抗干扰性强，以确保载波信号的稳定准确传输至待测设备130的线路以及确保待测设备130的线路反馈的互调干扰信号的准确传输。另外，第一传输线120的一端通过第二DIN接口121连接无源互调测试仪110，一方面确保信号的准确传输，另一方面，DIN接口易插拔，便于第一传输线120路的插拔，从而便于无源互调测试仪110的更换。
在其中一个实施例中，上述无源互调测试装置，还包括与无源互调测试仪110连接的终端150。
其中，终端150可以包括但不限于显示器以及智能终端150，智能终端150可以包括但不限于计算机终端150以及移动终端。无源互调测试仪110可将接收的互调干扰信号传输至终端150，可通过终端150对互调干扰信号显示，便于检测人员观测测试结果。另外，无源互调测试仪110可根据接收的互调干扰信号获取对应的信号强度数值(单位为dbm，分贝毫瓦)即无源互调值，然后将其传输至终端150显示，即通过信号强度数值的方式显示于终端150，利于检测 人员更加直观地观测测试结果。
在其中一个实施例中，上述无源互调测试装置，还包括连接于终端150与无源互调测试仪110之间的滤波器。
为了减少无源互调测试仪110将互调干扰信号传输至终端150的过程中的干扰，在终端150与无源互调测试仪110之间设置滤波器，用于滤除干扰噪声，使传递给终端150的互调干扰信号的准确性。
在其中一个实施例中，上述无源互调测试装置，还包括屏蔽箱160，待测设备130置于屏蔽箱160内。
为避免外界对待测设备130的线路的干扰，在本实施中，还设置屏蔽箱160，在进行检测时，将待测设备130置于屏蔽箱160内，将待测设备130与外接隔离，避免外接干扰，提高测试准确性。
在其中一个实施例中，上述无源互调测试装置，还包括用于支撑待测设备130的测试底座。如此，可将待测设备130置于该测试底座上进行测试，便于测试。
以上实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种无源互调测试装置，其特征在于，包括无源互调测试仪以及第一传输线；
    所述无源互调测试仪通过所述第一传输线连接待测设备的线路的一端，所述待测设备的线路的另一端连接负载；
    所述无源互调测试仪发射至少两个载波信号，通过所述第一传输线输出至所述待测设备，所述无源互调测试仪通过所述第一传输线接收所述待测设备返回的无源互调信号。
  2. 根据权利要求1所述的无源互调测试装置，其特征在于，还包括第二传输线；所述待测设备的线路的另一端通过所述第二传输线连接所述负载。
  3. 根据权利要求2所述的无源互调测试装置，其特征在于，所述第二传输线的一端与所述待测设备的线路的另一端焊接，另一端连接负载。
  4. 根据权利要求2所述的无源互调测试装置，其特征在于，所述第二传输线为电缆线，第二传输线的另一端通过第一DIN接口连接所述负载。
  5. 根据权利要求1所述的无源互调测试装置，其特征在于，还包括所述负载，所述负载为低互调负载。
  6. 根据权利要求1所述的无源互调测试装置，其特征在于，第一传输线的一端连接所述无源互调测试仪，所述第一传输线的另一端与所述待测设备的线路的一端焊接。
  7. 根据权利要求1所述的无源互调测试装置，其特征在于，所述第一传输线为电缆线，第一传输线的一端通过第二DIN接口连接所述无源互调测试仪。
  8. 根据权利要求1所述的无源互调测试装置，其特征在于，还包括与所述无源互调测试仪连接的终端。
  9. 根据权利要求1所述的无源互调测试装置，其特征在于，还包括屏蔽箱，所述待测设备置于所述屏蔽箱内。
  10. 根据权利要求1-9中任意一项所述的无源互调测试装置，其特征在于，所述待测设备为待测印刷线路板。
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