Passive intermodulation detection method and device

Abstract

An embodiment of the invention provides a passive intermodulation detection method and device. The device comprises a signal source input end, a duplexer, a frequency doubler, a mixer and a detector, the signal source input end is used for inputting at least two times of test signals with different frequencies, the duplexer is used for sending each test signal to an antenna feeder system and receiving harmonic signals which correspond to each test signal and are fed back by the antenna feeder system, the frequency doubler is used for conducting frequency doubling treatment on each test signal and obtaining frequency doubling signals of the test signals, the mixer is used for conducting frequency mixing treatment on the frequency doubling signals of the test signals and corresponding harmonic signals and obtaining frequency mixing signals, and the detector is used for obtaining a personal information management (PIM) testing result of the antenna feeder system according to the frequency mixing signals of each test signal. The embodiment only needs to send one frequency signal at one time, frequencies of the harmonic signals and the testing signals are far away, frequency spaces between sending signals and receiving signals of a PIM detecting device are big, requirements for the duplexer are reduced, size and weight are reduced, and cost is lowered.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a passive intermodulation detection method and device. Background technique [0002] In the mobile communication network, the antenna feeder system is an important part of the base station. The antenna feeder system is mainly composed of passive components such as antennas, jumpers and feeders. The passive components are nonlinear. When multiple frequencies are in these passive components When mixed, PIM (Passive Inter Modulation, Passive Intermodulation) signal will be generated. When the PIM signal is unqualified and within the receiving frequency band of the base station receiver, it will be received by the base station receiver, which will reduce the sensitivity of the receiver and cause communication The capacity of the system is reduced and the quality of the network is reduced. Therefore, when detecting that the PIM index is unqualified, it is necess...

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Problems solved by technology

[0004] In the process of realizing the embodiment of the present invention, the inventor found that two transmission signals are required in the prior art, and at the same time, since the intermodulation product is very close to the frequency of the transmission signal, the frequency interval between the transmission signal and the reception signal of the duplexer is very small Small, it is necessary to increase the order of the filter in the duplexer, which will increase the size and weight of the PIM detection equipment, and will also increase the cost

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