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HFSS Electrically Small Antenna Simulation

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lijianxing

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When we simulate an antenna using HFSS, an air box with a distance of quarter wavelength from the radiator usually should be created.

I am trying to simulate an antenna with frequency range of interest from 50 MHz to 500 MHz. Should I still use a quarter wavelength air box in the simulations. A quarter wavelength will be 1.2 m, which is too large, and will cause the simulation very slow.
 

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