"JOURNAL OF
RADIO ELECTRONICS" (Zhurnal
Radioelektroniki)
ISSN 16841719,
N
12, 2016 
contents
full
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Modes of a metal horn with a hyperbolic profile lateral surface
V. V. Serov, N. O. Strelkov,
V. V. Shtykov
National Research University
"Moscow Power Engineering Institute", Krasnokazarmennaya
14, Moscow 111250, Russia
The paper is received on
December 9, 2016
Abstract.
In open horns the main contribution to the
overall reflection coefficient makes the reflection from the aperture. Also,
there is a reflection at the transition from the waveguide to the horn. In
junction of a waveguide with a sectorial horn, matching of phase front does not
occur, which leads to the formation of higher modes. In order to reduce the
reflection coefficient of the aperture, it is necessary to increase its
geometrical dimensions. However, with increasing of horn’s angle, the
reflection of the transition increases. Reflection from the transition can be
minimized by applying a smooth transition form.
This paper presents specifications of a metal horn
with a hyperbolic profile lateral surface. Using a
horn with a hyperbolic profile
lateral surface allows us to minimize the reflection from the
transition of waveguide with a horn. The main reason of decreasing this
reflection may be matching phase of the wave front in junction of a waveguide
with a horn. This is an advantage of this form of lateral surface compared to
others (exponential, parabolic, etc.). In this paper
field patterns of a
metal sectorial horn and a horn
with a hyperbolic profile lateral surface are
obtained and investigated.
Experimental results on a horn with
a hyperbolic profile lateral surface are presented. A comparison of the
characteristics of a metal sectorial horn, a horn with a hyperbolic profile
lateral surface and a horn with a parabolic profile lateral surface has been
performed.
Keywords:
metal horn, hyperbolic
profile, modes, elliptic coordinate system,
periodic Mathieu functions.
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