Microstrip Antenna For Satellite

MICROSTRIP ANTENNA FOR SATELLITE
COMMUNICATIONS
Angel J. Lozada D.D., Su Donglin
School of Electronic and Information Engineering, Beihang University, Beijing 100083, China
josedasdores@gmail.com
sdl@buaa.edu.cn
*

Abstract— From the appearance of the satellites communications
one has been to improve two aspects keys in the systems of
communications: the quality of the service (greaterquality and
bandwidth of the signal) as well as the costs (smaller investment
for the operation and maintenance), during the process of
improvement of these two aspects one of the ways concludes that
to obtain it is to miniaturize the communications components,
and is in this process that is discovered the technology
microstrip. The objective of the present paper is to compare
models ofdesigned microstrip antennas for purposes of satellite
communications.

I. INTRODUCTION
The first designs date from the decade of 50, and they begin
to use in communications systems as decade of 70, for more
than 30 years the microstrip antennas have been object of
study for scientists around the world with the purpose to use
this type of antennas in the telecommunications with the
objectiveof reducing size and costs and of improving the
quality in the communications [1], [5].
The dimensions of the microstrip antennas are chosen so
that the structure dissipates the power in the form of radiation.
The structure consists of a metallic patch (comparable
dimensions to the wavelength), on a dielectric substrate
without ideally lost [3]. In the bottom of the structure is a
perfectconductive plane (Ground plane), as it is possible to be
observed in figure 1.

Microstrip Line

Ground
Plane
Substrate
Fig. 1 Basic Microstrip Patch

The dielectric is electrically thin to avoid flights and ground
waves and the permittivity must be in a rank in such a way
that the lines of field are confined around the line microstrip
The fundamental way is quasi-TEM, being most ofthe field
confined in the dielectric [4] [5], fig 2.

Fig. 2 Electric Field Radiation

The important advantages are his under profile, can be
adapted to the form of the structure (Flat or curved), their
manufacture is simple and cheap, they are possible to be made
to work to different frequencies and different polarizations.
The most important disadvantages are their low efficiency,limited power, narrow band and in addition the radiation to
the lines can modify the parameters of the antennas.
They are possible to be analyzed of diverse forms, from the
simplest models, based on lines of communication or cavities
to most complexes, using numerical or spectral methods [2].
Authors have studied diverse forms of patches [8], substrate
[12], and so on, in order to improve thebenefits of the
microstrip antennas and to especially extend its applicability
in the diverse areas of the telecommunications and in the
satellite communications that have as much demand and in
that a greater miniaturization of its components projects.
.
II. SATELLITE COMMUNICATIONS
With the development of the satellite technologies and its
consequent miniaturization, appeared the antennasmicrostrip,
giving the possibility of reducing costs, size, and of
maintaining or of improving the quality of the satellite links
and terrestrial. With low cost and size was possible carry out
the satellite technology to more people around the world, to
transform for ever the way at will communicate between each
human. Some basic characteristics to take in consideration on

microstripantenna are: Polarization, Antenna shape, Arrays
Antennas, Bandwidth and so on.
Is possible to use dual polarization on a communications
satellite for the reusability of the frequencies, to cover two
different coverage areas with same frequency but with
different polarization, this can be carried out using 2
transponders system, each one for each polarization, and these
can be RHCP or LHCP...