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已同步 2025-08-07 04:56:51 +08:00
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50 行
1.5 KiB
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Numerical comparisons
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This section presents some comparisons of models using different numerical modelling techniques.
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FDTD/MoM
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========
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The Finite-Difference Time-Domain (FDTD) method from gprMax is compared with the Method of Moments (MoM) from the MATLAB antenna toolbox (http://uk.mathworks.com/products/antenna/).
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Bowtie antenna in free space
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----------------------------
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:download:`antenna_bowtie_fs.in <../../tests/numerical/vs_MoM_MATLAB/antenna_bowtie_fs/antenna_bowtie_fs.in>`
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This example considers the input impedance of a planar bowtie antenna in free space. The length and height of the bowtie are 100mm, giving a flare angle of :math:`90^\circ`.
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.. literalinclude:: ../../tests/numerical/vs_MoM_MATLAB/antenna_bowtie_fs/antenna_bowtie_fs.in
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:language: none
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:linenos:
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For the MoM, the bowtie antenna was created in MATLAB using the ``bowtieTriangular`` class:
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.. code-block:: matlab
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bowtie = bowtieTriangular('Length', 0.1)
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Results
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-------
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:numref:`antenna_bowtie_fs_zin_results` shows the input impedance (resistive and reactive) for the FDTD (gprMax) and MoM (MATLAB) models.
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.. _hertzian_dipole_fs_results:
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.. figure:: ../../tests/numerical/vs_MoM_MATLAB/antenna_bowtie_fs/antenna_bowtie_fs_zin_results.png
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:width: 600 px
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Input impedance (resistive and reactive) of a bowtie antenna in free space using FDTD (gprMax) and MoM (MATLAB) models.
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The match between the FDTD and MoM solutions is generally very good.
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