Abstract
Содержание
- 1. Introduction
- 2. The principle of the implementation and operation collapsible reflector
- 3. Conclusion
Introduction
The work is dedicated to the development
of a reflector
antenna with
minimum weight and dimensions, as well as the maximum radio reflecting
ability
to output to the antenna space.
Antenna on the spacecraft must operate
reliably in the
conditions of the
raised radiation level, existence of micrometeorites, and long
influence of
ultra-violet sunlight. The reflecting surface should be made of
material with
high conductivity. The costs connected with removal of space aircraft
are very
great, therefore to designs of the space equipment are very large and
therefore
to the structure of space hardware high demands not only the
reliability and
functionality, and mass, geometric size and metal content.
A restriction on the size and
weight of the
space’s device usually leads to the fact that an antenna with
a
large size are made
in the form of inflatable structures, or sliding type. However, such
antennas
are semi-rigid, heavy-duty work in the space environment poses
additional
problems associated with materials and electrical characteristics of
the
antennas. However, parabolic antennas are suitable for use in a
foldable
design [1]
.
2. The principle of the implementation and operation collapsible reflector
The well-known Fresnel reflector antenna is a flat radio-coated plate with a conductive concentric annular surface, which are located in the same plane. This antenna reflector is used in terrestrial radio-electronic complexes. It can’t be used in space, because of its weight and dimensions make it uneconomical for transport it to orbit.
Figure 1 – Determining the focal length of the antenna of the zonal
The basis of this work is the
task of improving the antenna reflector Fresnel in which through the
use of honeycombs
structure with the function of disclosure is provided by reduction of
structural mass, reducing its size, and therefore transportation costs,
while
maintaining the same parameters of the Fresnel zone antennas, in
particular the
gain.
The task is solved by the fact that
radio-base of the
antenna reflector was
made of a honeycomb structure. On the radio transparent basis are
plotted odd
circular conductive surface. The honeycomb design, which consists of a
set of
identical prisms, has the function of disclosure. The inner diameter of
the
hexagonal prism cell is less than half the wavelength of the signal and
the
width of the connecting surface faces of the prisms is equal to or
greater than
0.05 wavelength of th sigal and is covered with a
conductive material.
Figure
2
- honeycomb design in a larger size
4 - coupling surface, 5 - honeycomb
Radio-base in the shape of a honeycomb structure can
emerge and spread
the antenna reflector, which greatly reduces its weight and dimensions.
On the
radio waves are the basis of a central disc 2 - the basis of the
reflecting
surface and the conductive surface of the odd-numbered concentric rings
3,
reflecting the signal with the same phase as the central disk thus
ensuring the
restriction pattern. In
the calculation,
it was determined that the volume of construction in a compressed form
would be
about 60% of the volume in expanded
form [2,
4].
3. Conclusion
Thus, the use of this antenna reflector based on the honeycomb structure allows to reduce metal consumption and dimensions, consequently the economic costs for transport [3].
This master's work is not completed yet. Final completion: December 2012. The full text of the work and materials on the topic can be obtained from the author or his head after this date.
References
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