Multifunctional handheld passive intermodulation analyzer

Abstract

The invention discloses a multifunctional handheld passive intermodulation analyzer which comprises the components of two signal source generating circuits, a 3db bridge, a duplex combiner, a changeover switch, a first receiver, a second receiver and a third receiver. Two passive intermodulation excitation signals which are generated by the signal source generating circuit are amplified and input to the 3db bridge for being combined. After combination of the passive intermodulation excitation signals, an obtained signal is output to the duplex combiner for being processed. The first receiver is used for analyzing the intermodulation signal of the RX receiving end of the duplex combiner. The second receiver is used for analyzing the second-order intermodulation / secondary harmonic of the duplex combiner. The third receiver is connected with the coupling port of the duplex combiner or the N port of the analyzer through the changeover switch, and is used for analyzing isolation or frequency spectrum. The multifunctional handheld passive intermodulation analyzer has advantages of realizing detection for multiple functions of the passive intermodulation analyzer, realizing high integration level of an instrument, reducing size and weight of the instrument, and realizing convenient carrying.

Description

technical field [0001] The invention relates to the technical field of passive intermodulation testing in a mobile communication antenna feeder system, in particular to a hand-held passive intermodulation analyzer with multiple functions and small volume. Background technique [0002] With the rapid development of modern mobile communication technology, the data and voice data passing through the fixed bandwidth are increasing day by day. There will be many signals of different frequencies in the same transmission medium. Since the transmission medium has certain nonlinear characteristics, these signals of different frequencies When the signals are mixed together and input to a transmission medium with nonlinear characteristics, a spurious signal-passive intermodulation (PIM) will be generated. [0003] When the passive intermodulation falls within the receiving frequency band of the base station, the sensitivity of the receiver will be reduced, resulting in a decrease in th...

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Problems solved by technology

[0004] There are some passive intermodulation analyzer designs in the prior art, such as figure 1 and figure 2 shown, where figure 1 The passive intermodulation analyzer shown includes a first signal source, a second signal source, a 3db bridge, a duplexer and two receivers. The bridge is input to the TX end of the duplexer, and the RX end and the coupling port of the duplexer are each connected to a receiver. The disadvantage is that it is impossible to analyze and measure the second-order intermodulation / second harmonic, frequency spectrum, and isolation

[0005] figure 2 The passive intermodulation analyzer shown includes a first signal source, a second signal source, a 3db bridge, a duplexer and a receiver, and the first signal source and the second signal source pass through a 3db circuit The bridge is input to the GSM end of the duplexer, and the DCS end of the duplexer is connected to the receiver. The disadvantage is that it can only analyze and measure the second-order intermodulation / second harmonic

[0006] In addition to the shortcomings of few functions, the above two existing passive intermodulation analyzers also have shortcomings such as large instrument volume and inconvenient portability caused by the low integration of various parts in the instrument. There are few functions, the instrument is bulky and inconvenient to carry. It is necessary to provide a multifunctional and highly integrated passive intermodulation analyzer to solve the above-mentioned defects in the prior art.

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