Method for rapidly determining passive intermodulation level of cavity filter

A cavity filter and passive intermodulation technology, which is applied to waveguide devices, instruments, circuits, etc., can solve the problems that restrict the development of low passive intermodulation and high-power microwave components, and the passive intermodulation performance of products cannot be guaranteed. , to achieve good results

Active Publication Date: 2016-11-23
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0003] At present, the passive intermodulation characteristics of microwave components can only be tested and verified after the design, processing, and commissioning of the product are completed. As a result, the passive intermodulation performance of the product cannot be guaranteed. Once the passive intermod

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  • Method for rapidly determining passive intermodulation level of cavity filter
  • Method for rapidly determining passive intermodulation level of cavity filter
  • Method for rapidly determining passive intermodulation level of cavity filter

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[0040] Example

[0041] Here, a 2-stage aluminum alloy cavity filter is taken as an example to introduce the implementation process of the method of the present invention, and the process is as follows figure 1 Shown.

[0042] (1) Carrier power f 1 = 2.16GHz, f 2 =2.21GHz, m=3, n=2, 5th order passive intermodulation frequency f p =2.06GHz, P 1 =P 2 =100W, divide the contact part into 8 equal parts, the circumference of the contact part is L=42.4e-3m, and the length of each part is 5.3e-3m;

[0043] (2) The frequency domain simulation tool Ansys HFSS is used for electromagnetic field simulation at 2.16GHz, the input power of the input port is 100W, and the average surface current density of each part of the contact part is:

[0044] J 1 =[28.53,24.48,22.02,24.97,27.31,28.97,30.83,32.49]A / m

[0045] The frequency domain simulation tool Ansys HFSS is used for electromagnetic field simulation at 2.21GHz, the input power of the input port is 100W, and the average surface current density of e...

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Abstract

The invention relates to a method for rapidly determining a passive intermodulation level of a cavity filter. The method comprises the following steps: firstly equally dividing a cavity filter contact part, carrying out frequency domain electromagnetic field simulation twice at two carrier frequencies, and respectively obtaining surface currents of the contact part; then determining voltage drop of each part of the contact part by combining contact resistance, and determining nonlinear current of each part according to nonlinear current-voltage characteristics of the contact part; and finally taking the nonlinear current as excitation, carrying out electromagnetic simulation at a passive intermodulation frequency, and finally determining the passive intermodulation power level of a port of the cavity filter, so that quick determination of the passive intermodulation level of the cavity filter is realized. The method provided by the invention can be used for solving the problem of the passive intermodulation simulation of the cavity filter, and passive intermodulation performance of the cavity filter can be effectively simulated and optimized.

Description

technical field [0001] The invention belongs to the field of passive intermodulation of microwave components, and relates to a method for determining the passive intermodulation level of a cavity filter. Background technique [0002] Passive-Intermodulation (PIM) refers to the combination of carrier frequency due to the mutual modulation of carrier signals due to the nonlinearity of microwave passive components when two or more carriers are input under high power conditions. A phenomenon in which products fall into the receive passband and cause interference. When the intermodulation level is low, it will increase the noise floor of the received signal, reduce the signal-to-noise ratio of the receiver, and increase the bit error rate; when the intermodulation level is further increased, it will affect the normal operation of the entire communication system. Forced to reduce power usage, or divide the use of channels; in severe cases, intermodulation products will flood the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50H01P1/207
CPCG06F30/20H01P1/207
Inventor 王新波白鹤崔万照王瑞李军白春江谢贵柏杨晶
Owner XIAN INSTITUE OF SPACE RADIO TECH
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