Intermodulation offset device for passive device

Abstract

The invention relates to an intermodulation offset device for a passive device. The intermodulation offset device comprises a power coupler, an adjustment module and a nonlinear device, wherein an input and an output of the intermodulation offset device share one port; the power coupler couples a transmission signal from the passive device through the input / output port; the adjustment module and the nonlinear module are respectively used for primarily processing the coupled transmission signal; the primarily-processed signal is reflected at the tail end of the intermodulation offset device and then is secondarily processed, so that a power signal containing a second intermodulation offset signal is generated in the secondarily-processed signal; the second intermodulation offset signal in the power signal has the same frequency and level and opposite phase with an intermodulation signal of the transmission signal in the passive device; and the power signal is overlapped with the transmission signal in the passive device and is outputted to the passive device through the input / output port. According to the intermodulation offset device disclosed by the invention, the intermodulation signal of the passive device can be offset in the whole work frequency range.

Description

technical field [0001] The present invention relates to the field of communication. In particular, the present invention relates to an intermodulation cancellation device for passive devices. Background technique [0002] Passive components such as transmit filters, duplexers, combiners, and power splitters are widely used in antenna feeder systems. The antenna feed system is often used to share the antenna after combining the receiving path and the transmitting path. In the antenna feeder system, the signal power of the transmission path is much greater than that of the reception path, and the transmission signal will generate a large level of intermodulation signal through the passive nonlinear device. At the antenna end, the intermodulation signal falls into the receiving channel, forming intermodulation interference, which makes the antenna feeder system unable to work normally. Therefore, when passive devices are working, the passive intermodulation signal level gene...

AI Technical Summary

Problems solved by technology

[0004] This technical solution has the following deficiencies: 1. This technical solution is not suitable for passive devices. It does not consider the difference in intermodulation values ​​at different positions inside the nonlinear unit. This difference is obvious for passive devices. In passive circuits Among them, the amplitude attenuation and phase change of the transmission signal are very large. In the case of intermodulation at multiple positions, the intermodulation signal generated by the front end of the circuit will be greatly attenuated during the signal transmission process. The intermodulation signal output by the circuit contains only The intermodulation signal generated at the end of the circuit, therefore, for the duplexer, if the signal is taken from the front end of the nonlinear unit, the intermodulation cancellation signal generated cannot be canceled out with the intermodulation signal at the antenna port; 2. The technical solution The generated intermodulation cancellation signal is the second group of high-order intermodulation products, which are limited to fixed-order intermodulation products, and can only eliminate intermodulation signals of nonlinear units in the corresponding frequency band, which has limitations

[0005] In addition, other existing methods for reducing passive intermodulation signal levels mainly focus on structure and technology. These methods often require additional costs, and the pass rate is not easy to control, and the repair rate is high.

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