УДК 612.396.674.1
АНТЕННА СУДОВОЙ ЗЕМНОЙ СТАНЦИИ СИСТЕМЫ INMARSAT-C
В. В. Головин, Ю.
Н. Тыщук, Ю. П. Михайлюк, И. Л. Афонин
Севастопольский государственный университет, 299053,
Севастополь, ул. Университетская, д.33
Статья
поступила в редакцию 8 октября 2019 г.
Аннотация. В статье представлены результаты
разработки и исследования малогабаритной антенны земной станции системы INMARSAT-C с ненаправленной в
верхнем полупространстве и равномерной в азимутальной плоскости диаграммой направленности,
с близкой к круговой поляризацией поля излучения в пределах всего верхнего
полупространства.
Представлены результаты численного моделирования характеристик антенны с учётом
элементов конструкции.
Ключевые
слова: спиральная
антенна, ненаправленное излучение, круговая поляризация, INMARSAT-C антенна.
Abstract. This paper presents the results of the development and theoretical
investigation of compact weakly directional antenna of ship earth station
system INMARSAT-C, which differs from the known prototypes by especially
qualitative characteristics of the circular polarization field.
The
antenna design is based on the four-pass spiral structure with quadrature
emitter excitation. Helix emitters are characterized by geometric parameters:
the initial and final winding angle of spirals
βi and
βf, the diameter of the
cylinder d, the number of turns of spirals n. The following values are
experimentally obtained:
βi =13o....
15o; βf =27o....
33o; d=(0.18...0.26)λ0; n=1...2. The excitation mode of
spiral emitters provides the formation of circular polarization, which is
opposite to the winding direction of spiral emitters in the direction of
rotation.
A
distinctive feature of the developed antenna is that due to the use of
irregular winding angle radiating helical structures antenna operation mode is formed,
which provides the highest quality polarization characteristics. On the each of
the helical conductors the amplitude-phase current distributions are formed.
They characterized by current antinodes in two regions. While the one region determines
the radiation field with circular polarization in the direction of the axis Z, the
other region determines the radiation field with circular polarization in the
directions close to the plane XY. In this case, the antenna is characterized by
enough uniform radiation in the upper half-space of the field with polarization
as close to circular as possible.
We
investigated the radiation characteristics and input characteristics of the
antenna in CAD in the frequency range 1.53 — 1.65 GHz, taking into account the
influence of the dielectric material of the support cylinder and the
radioparent cover. It is shown that in the vertical plane the antenna is
characterized by the radiation pattern of the width 180° at the level of -3 dB
and a high ellipticity coefficient within the entire upper half-space. In this
case, the antenna is characterized by high-quality matching at the inputs of
spiral emitters with VSWR ≤ 1.5.
Key words: helical
antenna, omnidirectional radiation, circular polarization, INMARSAT-C antenna.
Для цитирования:
В. В. Головин, Ю. Н. Тыщук, Ю. П.
Михайлюк, И. Л. Афонин. Антенна
судовой земной станции системы INMARSAT-C. Журнал
радиоэлектроники [электронный журнал]. 2019. № 10. Режим доступа: http://jre.cplire.ru/jre/oct19/8/text.pdf
DOI
10.30898/1684-1719.2019.10.8