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guid for design horn antenna

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arm_52

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i simulated a horn antenna in feko at x band ferequency.
i know the feed should be placed at Lg/4 from end of rectangular waveguide and the prob should be L0/4 length.
but i dont know what should be the whole length of the rectangular waveguide for achieving minimum VSWR.
who can guide me PLZ?
 

ferdows

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hi
i think no one can said how we can achieve the lowest VSWR
but if u mean that u need VSWR less than 2 the length of waveguide should be between 24-26mm
 

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