Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Designing latest-generation antennae for communications satellites

16.02.2004


For his PhD thesis, the engineer, Jorge Teniente Vallinas, has developed a method for designing antennas used in satellites such as Hispasat. The PhD, at the Public University of Navarre, was awarded the second prize in the latest edition of the Rosina Ribalta Awards from the Epson Ibérica Foundation for the best PhD thesis in the field of Information and Communications Technology.

The aims of this doctoral thesis were, on the one hand, to establish the bases for the design of Gaussian profiled corrugated antennae which has been worked on by the Public University of Navarre Antennae Group since 1995 and, on the other, to devise and design cutting edge technology of antennae, reducing machining costs and size, at the same time as maintaining the excellent radiation features, all this based on the experience acquired in the design of Gaussian profiled corrugated antennae.

More services at lower cost



The Gaussian profiled corrugated antennae are currently the best possible solution for obtaining very high gain radiation patterns. More specifically, the advantages over the classic corrugated horn antennae are twofold: firstly, it is possible to design lateral lobe antennae much lower than with any other type of corrugated profile and, also, they are somewhat shorter than the rest of the corrugated antennae.

Classical corrugated antennae, that normally have been used in high-performance applications, apart from illuminating the zone covering its target area, have lateral lobes that illuminate other zones to such an extent that they may interfere with other antennae or instruments present in these areas. However, Gaussian profiled antennae can reduce the power radiated by the lateral lobes of classical antennae - in which the power is 1000 times less than that at the main surface. The new antennae can achieve between 10 and 100 times even less than this.

The Gaussian profiled antennas have similar behaviour to the metallic end opening or horn of a wind musical instrument but, instead of transporting acoustic waves, they are designed to transport electromagnetic radiation; this is why they are also called “horn antennae”. With these antennae, radiation at microwave or millimetric frequencies enter via the narrowest, posterior part and the antennae shapes the guided waves within its interior in such a way that they come out into open space with certain characteristics, according to their profile. Corrugated antennae -with rectangular metallic folds in its interior – unlike the smooth ones, achieve an internal field shape with two characteristics: firstly, they discriminate very well between polarisations, by which each antenna can work in two channels per frequency and, secondly, the radiated surface is much more like a pure surface of free space.

Contrasted experience

Since the first patents of this type of antennae were produced at a national, at the Public University of Navarre in 1995 and 1996, it has been incorporated into a number of satellites. For example, in 1998, when this technology was still emerging, the antenna currently used by Hispasat 1C to serve Europe was designed and developed. This same antenna was also to be used, some years later, in Hispasat 1D.

In 2000, two millimetric-wave frequency antennae (about 350 GHz) were designed for the European Space Agency’s MARSCHALS project. These were instruments installed in aircraft with the aim of scanning at these frequencies the upper troposphere and the lower stratosphere, given the importance of these layers of the atmosphere for the global climate.

Since 1999, other researchers from around the world, taking advantage of the fact that the registered patents only covered national territory, have been using this type of antennae proposed by the Public University of Navarre. Thus, a group of English researchers has employed the same techniques to develop the high-frequency instrument for use in the future PLANCK satellite and another, Italian research group has used the same idea for a low-frequency instrument for use in the same satellite. Both research groups have received advice from the researchers at the Navarre-based university.

Finally, in 2002, a new design for this type of antennae, shorter and more compact, with very low lateral lobes and maintaining good levels of discrimination of polarisation and wide moderate bandwidth, was marketed by the UK company, Flann Microwave. Regarding this design, there is a request for an international patent to avoid the uncontrolled marketing by researchers from outside the Public University of Navarre.


Iñaki Casado Redin | Basque research
Further information:
http://www.basqueresearch.com/berria_irakurri.asp?Gelaxka=1_1&Berri_Kod=417&hizk=I
http://www.unavarra.es

More articles from Communications Media:

nachricht New Technologies for A/V Analysis and Search
13.04.2017 | Fraunhofer-Institut für Digitale Medientechnologie IDMT

nachricht On patrol in social networks
25.01.2017 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO

All articles from Communications Media >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>