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DIAGONAL MULTIMODE HORN ANTENNAS

DIAGONAL MULTIMODE HORN ANTENNAS. Multimode Horn Antennas ( some applications ) . m ultimode excitations are used : to obtain equal beam - width s in the E and Hplanes to reduce the side lobe levels. Calculation of Aperture Fields. Modes: TE 01 mode

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DIAGONAL MULTIMODE HORN ANTENNAS

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  1. DIAGONAL MULTIMODE HORN ANTENNAS

  2. Multimode Horn Antennas ( some applications ) • multimode excitations are used : • to obtain equal beam-widths in the E andHplanes • to reduce the side lobe levels

  3. Calculation of Aperture Fields • Modes: • TE01 mode • TE10 mode (orthogonal counterpart of TE01) These modes are added vectorially to create the diagonal mode

  4. 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

  5. Calculation of Far-Fields

  6. Calculation of Far-Fields y-component similarly x-component

  7. Calculation of Far-Fields the electric field amplitude in the farfield for principal planes

  8. Calculation of Far-Fields the electric field amplitude in the far field for the ± 45o planes

  9. 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

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