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Passive intermodulation suppression method of circulator for communication

A passive intermodulation and circulator technology, applied in waveguide devices, special data processing applications, electrical components, etc., can solve problems such as time-consuming, labor-intensive communication quality, adverse effects of system solutions, and system performance

Active Publication Date: 2020-12-01
中国电子科技集团公司第九研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Passive intermodulation suppression method of circulator for communication
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  • Passive intermodulation suppression method of circulator for communication

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiment 1: see Figure 1 to Figure 2, A circulator for communication, including a chamber composed of an upper cavity and a lower cavity, and a central conductor, a rotating ferrite substrate, a permanent magnet, a compensation sheet, a matching medium, and a magnetic circuit shield are arranged in the chamber. This embodiment proposes a passive intermodulation suppression method for a communication circulator, including the following steps:

[0048] (1) Determine the frequency band of the circulator to be processed, the power index, and the expected PIM value under the power index, and randomly select two frequencies within the working frequency band of the circulator as f 1 and f 2 input signal;

[0049] (2) Establish the simulation model of the circulator in the HFSS simulation software, and under the power index, obtain the intermodulation signal frequency 1 as (2f 1 -f 2 ) The maximum field strength A, and the intermodulation signal frequency 2 is (2f 2 -f ...

Embodiment 2

[0077] Example 2: see Figure 1 to Figure 6 , in order to better illustrate the present invention, we give further examples on the basis of Example 1, and give detailed numerical values.

[0078] A communication circulator passive intermodulation suppression method, comprising the following steps:

[0079] (1) Determine the frequency band of the circulator to be processed, the power index, and the expected PIM value under the power index, and randomly select two frequencies within the working frequency band of the circulator as f 1 and f 2 input signal;

[0080] In this embodiment, we want to design a communication circulator, its structure is a strip line circulator, the operating frequency of the device is 925-960MHz, and the power index is: the loading power is 40dBm for two channels. PIM value is -80dBc@2×40dBm, input signal f 1 for 935M, f 2 It is 950M. In fact, the frequency f 1 and f 2 It can be randomly selected, and generally the two end values ​​of the operat...

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Abstract

The invention discloses a passive intermodulation suppression method for a circulator for communication. The method comprises the following steps of: (1) determining a frequency band and a power indexof a circulator to be machined, and an expected PIM value expected to be reached under the power index; (2) establishing a simulation model of the circulator in HFSS simulation software, and obtaining maximum field intensities A and B at (2f<1>-f<2>) and (2f<2>-f<1>) under the power index; (3) calculating a PIM value of the simulation model according to the A and the B, and marking the PIM valueas a simulation PIM value; and (4) comparing the simulation PIM value with the expected PIM value, and adjusting the structure of the simulation model in the HFSS simulation software according to a comparison result until conditions are met. According to the method of the invention, the determinant causing the passive intermodulation of the circulator is determined; and a method for quantitativelyanalyzing the passive intermodulation index of the circulator by using the determinant is provided; and the method is also suitable for other gyromagnetic ferrite material-based microwave passive devices with three-order passive intermodulation inhibition requirements.

Description

technical field [0001] The invention relates to a passive intermodulation suppression method, in particular to a passive intermodulation suppression method for a communication circulator. Background technique [0002] Active devices are well known to create nonlinear effects in the system. Various techniques have been developed to improve the performance of such devices during the design and operation phases. What is easy to overlook 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 it's hard to untangle. [0003] Ferrite circulator isolators are passive devices widely used in 4G\5G communicatio...

Claims

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Application Information

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IPC IPC(8): H01P1/38H01P11/00G06F30/20
CPCH01P1/38H01P11/00G06F30/20
Inventor 闫欢蒋运石韩晓川
Owner 中国电子科技集团公司第九研究所
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