Figure 156. Tapered Horn.
(2) Circular horn. Occasionally, to obtain more uniform illumination
of the reflector, a horn with circular cross section is used.
This is
ordinarily fed by a circular waveguide. A septum, or conducting partition,
is inserted in the circular waveguide to control the plane of polarization.
This operates by absorbing all signals having electric fields parallel to
the surface of the septum.
The horn shown in Figure 157 radiates only
horizontally polarized signals.
214
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