DIAGONAL MULTIMODE HORN ANTENNAS

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DIAGONAL MULTIMODE HORN ANTENNAS
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Multimode Horn Antennas ( some applications )

• multimode excitations are used
• to obtain equal beam-widths in the E and
  Hplanes
• to reduce the side lobe levels

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Calculation of Aperture Fields

• Modes
• TE01 mode
• TE10 mode (orthogonal counterpart of TE01)

These modes are added vectorially to create the
diagonal mode
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Calculation of Aperture Fields
From the electric field vector, it is clear that
only Ex exists for one mode and only Ey
exists for the orthogonal mode. The spatial
variation of Ex and Ey is given by
propagating wave function
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Calculation of Far-Fields
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Calculation of Far-Fields
y-component
similarly
x-component
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Calculation of Far-Fields
the electric field amplitude in the far field for
principal planes
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Calculation of Far-Fields
the electric field amplitude in the far field for
the 45o planes
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References

• A.W. LOVE The Diagonal Horn Antennas Microwave
  J., Vol. V, pp. 117-122, Mar. 1962
• Constantine A. Balanis, Antenna Theory, Analysis
  and Design 2nd Ed., Wiley,1997
• R.E Collin, Antennas and Radiowave Propagation
  McGraw- Hill , 1985