Array of satellite antennae for global communication coverage on Earth

April 18th, 2012
This is Alberto Reyna Maldonado. Credit: UPNA
For his PhD thesis at the Public University of Navarre (UPNA) Alberto Reyna Maldonado, designed an array of satellite antennae which reduces the volume, weight and heat rise of the antenna system without losing its radiation performance, in such a way that energy is received uniformly at all points of the Earth that the satellite can observe. Alberto Reyna Maldonado has a Masters in Electronic Engineering Sciences at the Autonomous University of Tamaulipas (México),

One of the types of antennae used in telecommunications systems is that known as antennae groups or arrays, involving the positioning of several antennae close to each other. "One of the advantages is that the signal can be directed from one place or another without the need to continuously reposition the antennae or creating radiation in some specific manner", explained Alberto Reyna, "because it is something that can be done electronically: managing the characteristics of the radiation. In the development of the research, we did this with various types of antennae arrays: square, circular rings, linear, etc."

Basically it approaches a problem presented by satellite communications: "on positioning an array of antennas on the satellite, it becomes very voluminous, heavy and it makes the creation of radiation complicated. For example, having the antennae connected to a different amplifier, with different amplification gain value causes some of them to heat up more than others and thus, some way has to be found of dissipating the heat in space, where there is no air".

To solve this without losing the radiation performance of the antenna array, methods inspired in Darwin's theory of evolution were used "where the antennae array would be an individual which evolves with time with ever-increasingly better adaptation", and in the social behaviour of species, "for example, in order to solve a problem, flocks of birds follow a leader of the species to arrive at some specific point.

According to this researcher, "we opted to design antennae arrays with evolutionary methods, in such a way that, instead of connecting each antenna to an amplifier with different amplification gain value, we could use one amplifier for several antennae; for example, I can have sixty antennae with only three amplifiers and thus achieve a reduction in size, volume, weight and the heat generated in the satellite will not be so difficult to dissipate; all this while still maintaining the performances of the radiation".

Finally, the arrays of antennae are designed in order to achieve isoflux-type radiation, which manages to make the energy received by the Earth to be equal at any point thereon. "The Earth being squashed at the poles and having an elliptical shape, the signal coming from the satellite is delayed or may lose energy; thus, we designed the array of antennae so that the signal has a shape similar to that of a cone, in order to encompass the whole of the Earth's surface equally", explained Mr Reyna. "In short, it can be said that we have designed a type of array of antennae for satellite which manages that the radiation is uniformly incident on all parts of the Earth, thus avoiding some zones receiving more energy than others".

The PhD "Evolutionary Antenna Arrays Synthesis for Isoflux Radiation in Satellite Applications" was led by doctors Marco Antonio Panduro from the Autonomous University of Tamaulipas (México) and Carlos del Río Bocio from the UPNA, and was awarded excellent cum laude. As a result of this research, there have been six scientific articles published in specialist journals and four presentations at international congresses. Mr Reyna undertook his studies at the Reinosa Rodhe Multidisciplinary Academic Unit, where he also completed his Masters, prior to doing his PhD at the UPNA. He is currently working as a research collaborator at the previously mentioned Unit at the Autonomous University of Tamaulipas (México).

Provided by Elhuyar Fundazioa

This Science News Wire page contains a press release issued by an organization mentioned above and is provided to you “as is” with little or no review from Phys.Org staff.

More news stories

Archaeologists find ancient necropolis in Egypt

Egypt's Antiquities Ministry announced on Saturday the discovery of an ancient necropolis near the Nile Valley city of Minya, south of Cairo, the latest discovery in an area known to house ancient catacombs from the Pharaonic ...

AI and 5G in focus at top mobile fair

Phone makers will seek to entice new buyers with better cameras and bigger screens at the world's biggest mobile fair starting Monday in Spain after a year of flat smartphone sales.

Researchers turn light upside down

Researchers from CIC nanoGUNE (San Sebastian, Spain) and collaborators have reported in Science the development of a so-called hyperbolic metasurface on which light propagates with completely reshaped wafefronts. This scientific ...

Walking crystals may lead to new field of crystal robotics

Researchers have demonstrated that tiny micrometer-sized crystals—just barely visible to the human eye—can "walk" inchworm-style across the slide of a microscope. Other crystals are capable of different modes of locomotion ...

Recurrences in an isolated quantum many-body system

It is one of the most astonishing results of physics—when a complex system is left alone, it will return to its initial state with almost perfect precision. Gas particles, for example, chaotically swirling around in a container, ...