Method and system for measuring passive intermodulation generation point of microwave device by using electromagnetic wave phase
A technology of passive intermodulation and phase measurement, applied in measuring devices, material analysis using wave/particle radiation, instruments, etc., can solve the problem of low noise and achieve the effect of quickly solving the problem of passive intermodulation
Inactive Publication Date: 2011-08-17
ZHEJIANG UNIV
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With the rapid development of mobile communication, the sensitivity requirements of the receiving system are increasing day by day. When the carrier signal is small, the noise caused by passive intermodulation due to the nonlinearity of the device is not large and does not attract people's attention, but when the carrier signal power When the value is larger, the effect of this intermodulation is more obvious.
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[0024] The signal source part can be designed with a phase-locked loop chip, and the phase-locked loop chip can be ADI's ADF4350.
[0025] The power divider can use Weinschel power divider 1870A.
[0026] The power amplifier can adopt the RF series power amplifier of Milmega Company, the frequency range is 200MHz~1GHz, and the output power is from 80W to 1200W.
[0027] The combiner can use Narda combiner SWC10644.
[0028] The duplexer can use K&L duplexer WSD-00230.
[0029] The mixer can use the ADE-12 of MINI company.
[0030] The filter can adopt TXC101 / 102 of RFM Company.
[0031] The phase comparator can adopt AD8302 of ADI Company. Its operating frequency is from low frequency to 2.7GHz.
[0032] The analog-to-digital converter can use TI's ADS8363.
[0033] The digital processor can be a computer, or it can be realized by an embedded system based on a microprocessor or DSP.
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The invention discloses a method and system for measuring a passive intermodulation generation point of a microwave device by using an electromagnetic wave phase. Two paths of signals with different frequencies are combined into one path by a combiner and then enter a detected device via an end TX of a duplexer to be passively intermodulated in the detected device; one part of intermodulation product returns to the duplexer and enters a receiving loop via an end RX. After two paths of signals with different frequencies in a transmission loop are mixed, a signal component having the same frequency with the intermodulation product can be extracted; a phase of the signal component is compared with that of the obtained intermodulation product; and a phase difference generated by roundtrip of the signal in a measuring device is obtained after a phase difference caused by the measuring system is removed. A passive intermodulation generation position is obtained according to phase difference analysis. The method for measuring the passive intermodulation generation point, disclosed by the invention, which is realized by using a relation between the electromagnetic wave phase and a transmission distance and combining with the Chinese remainder theorem, can be used for accurately detecting the passive intermodulation generation position of the microwave device, thereby providing support for fast solving the passive intermodulation problem.
Description
technical field [0001] The invention relates to a method for measuring the passive intermodulation occurrence point of a microwave device, in particular to a method and a system for measuring the passive intermodulation occurrence point of a microwave device by using electromagnetic wave phase. Background technique [0002] When two or more carrier signals pass through a component with a nonlinear response, a new signal with a frequency different from the carrier frequency will be generated. This phenomenon is called intermodulation. Passive Inter Modulation (PIM for short) refers to the phenomenon that the linear combination product of carrier signal frequency generated by two or more transmitting carriers meeting in passive devices falls into the receiving passband to form interference . With the rapid development of mobile communication, the sensitivity requirements of the receiving system are increasing day by day. When the carrier signal is small, the noise caused by p...
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IPC IPC(8): G01N23/00
Inventor 冉立新牟文秋皇甫江涛
Owner ZHEJIANG UNIV
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