ANTENG Ch13SAL032006

ANTENG Ch13SAL032006 - ECE 5318/6352 Antenna Engineering...

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1 Chapter 13 Chapter 13 Horn Antennas ECE 5318/6352 ECE 5318/6352 Antenna Engineering Antenna Engineering Dr. Stuart Long Dr. Stuart Long
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2 ± CONFIGURATIONS CONFIGURATIONS ± E-plane ± H-plane ± Pyramidal ± Conical
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3 ± H-PLANE PLANE SECTORIAL SECTORIAL Assume a mode waveguide feeding the horn. Horn is flared in plane containing H-field. Find field at aperture, then radiated fields. 10 TE ± Assumptions
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4 1. Neglecting effects of currents coupled to outside walls of horn 2. Neglecting higher order modes in aperture ± Approximations: Can think of fields in horn like a radial WG aperture, aperture plane of horn does not coincide with a constant phase surface, thus the phase varies across the aperture ± H-PLANE PLANE (CONT) (CONT)
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5 ± H-PLANE PLANE (CONT) (CONT) ± H-plane sectoral horn
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6 ± H-PLANE PLANE (CONT) (CONT) ± H-plane coordinate system
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7 ± H-PLANE (CONT) 2 . ρ for asymp 2 For constant 2 , as length but ultimately increasing does not improve BW n BW ψ ↓↑ 2 For constant , there is an optimum 2
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ANTENG Ch13SAL032006 - ECE 5318/6352 Antenna Engineering...

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