Passive Intermodulation Suppression Method for Communication Circulator

Abstract

The invention discloses a passive intermodulation suppression method for a circulator used in communication, including (1) determining the frequency band of the circulator to be processed, the power index, and the expected PIM value under the power index; (2) HFSS simulation The simulation model of the circulator is established in the software, and under the power index, it is obtained in (2 f 1 - f 2 ),(2 f 2 - f 1 ) of the maximum field strengths A and B; (3) Calculate the PIM value of the simulation model according to A and B, and mark it as the simulated PIM value; (4) Compare the simulated PIM value and the expected PIM value, and use the HFSS simulation software to The structure of the simulation model is adjusted until the condition is met. The invention determines the determinant factor causing the passive intermodulation of the circulator, and proposes a method for quantitatively analyzing the passive intermodulation index of the circulator by using the determinant factor, which is also applicable to other third-order passive components based on gyromagnetic ferrite materials. Microwave passive devices that require source intermodulation suppression.

Description

Technical field [0001] The present invention relates to a passive alternating suppression suppression method, and more particularly to a communication loop passive alternating adjustment suppression method. Background technique [0002] It is well known that active devices produce nonlinear effects in the system. A variety of techniques have been developed to improve the performance of such devices in design and operational phases. It is easy to ignore that passive devices may also introduce nonlinear effects; if they do not correct, these nonlinear effects may seriously affect system performance. In the 5G cellular communication system, passive intercalations may cause interference, reduce receiver sensitivity, and even completely block communication, this interference may affect production of its honeycomb and other receivers, in the cellular communication industry is a major problem, And it is difficult to solve. [0003] The ferrite loop isolator is a large number of passive ...

AI Technical Summary

Problems solved by technology

What is easily overlooked is that passive components can also introduce nonlinear effects that can severely impact system performance if left uncorrected

In 5G cellular communication systems, passive intermodulation may cause interference, reduce receiver sensitivity, or even completely block communication. This interference may affect the cell that generated it and other nearby receivers. It is a major problem in the cellular communication industry. and difficult to resolve

[0003] Ferrite circulator isolators are passive devices widely used in 4G\5G communication systems. Due to the nonlinear effect of ferrite materials, it is easy for the device to generate alternating current at its intermodulation frequency point when multiple high-power signals are input. Modulation signals, especially at the third-order inter-frequency modulation points such as 2f1-f2 and 2f2-f1, because their frequencies are very close to the center frequency point, it is difficult to eliminate them by adding filters, so it often affects communication quality and system solutions. adversely affect

The traditional passive intermodulation suppression method is usually a qualitative analysis of the device. Based on experience and experimental verification, there are usually multiple iterations of device design, which is time-consuming and laborious.

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