Analytical verification method of inverse discrete fourier transform for electromagnetic field propagation in waveguides

A technique of discrete Fourier transform and analytical verification, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as inability to correctly obtain analytical field amplitudes

Active Publication Date: 2019-03-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0020] In view of the above-mentioned problems or deficiencies, in order to solve the problem that the existing discrete Fourier transform analytical verification method cannot correctly obtain the analytical field amplitude when the frequency of the electromagnetic wave is less than the cut-off frequency, the present invention provides a discrete Analytical Verification Method of Inverse Fourier Transform

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  • Analytical verification method of inverse discrete fourier transform for electromagnetic field propagation in waveguides
  • Analytical verification method of inverse discrete fourier transform for electromagnetic field propagation in waveguides
  • Analytical verification method of inverse discrete fourier transform for electromagnetic field propagation in waveguides

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Embodiment Construction

[0044] Taking a standard rectangular waveguide BJ100 as an example, the length of its wide side is a=20.86mm, and the length of its narrow side is b=10.16mm. The present invention will be further described in detail through the specific implementation process.

[0045] Step 1. Set the time-domain signal p(t) as the Reck wavelet signal, such as figure 1 shown

[0046]

[0047] Its spectrum is as figure 2 As shown, the peak frequency f R = 10GHz, time delay t R =1 / f R . Port mode selection TE10 mode

[0048] e y (x,y)=sin(2πx / a) (14)

[0049] Set grid step size Δx=1.143mm, Δy=1.106mm, Δz=1.143mm in three directions, time step size Δt=1.9063188e-12s, total time steps N t =4096, load the signal on the waveguide port

[0050] E. y (x,y,z=0,t)=e y (x,y)p(t) (15)

[0051]And using the finite difference time domain method to simulate and calculate the simulated waveguide to obtain the electromagnetic field amplitude in the waveguide.

[0052] Step 2. The propagation c...

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Abstract

The invention belongs to the technical field of computational electromagnetics, in particular to an inverse discrete Fourier transform analytical verification method for propagating an electromagneticfield in a waveguide during a waveguide structure simulation calculation process. The invention corrects the error that the amplitude of the electromagnetic wave propagates infinitely in the waveguide when the signal frequency is less than the cutoff frequency by modifying the calculation formula of the waveguide propagation constant in the analytical verification method of the inverse discrete Fourier transform, and provides a complete analytical verification method suitable for describing any frequency range in the waveguide.

Description

technical field [0001] The invention belongs to the technical field of computational electromagnetics. In the waveguide structure simulation calculation process, it involves a verification method for calculating the electromagnetic field propagation in the waveguide structure by using the time domain finite difference method, specifically an analytical verification method for the inverse discrete Fourier transform of the electromagnetic field propagation in the waveguide. Background technique [0002] The waveguide is a microwave directional transmission structure, which is mainly used in the fields of communication and microwave energy transmission. It is a widely used method to design and optimize the waveguide structure by using the finite-difference time domain method. In order to verify the correctness of the calculation results, it is a good verification method to compare with the analysis results. At present, the analytical verification method of discrete Fourier tr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 金晓林谷晓梁李金欣蔡文劲黄桃杨中海李斌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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