Rafael Caldeirinha and Telmo Fernandes, both from IT in Leiria, Iñigo Cuiñas from the University of Vigo and David Ferreira (a former Ph.D student, now working at Blu Wireless, Lda, Bristol, England), have won the 2018 Premium Award for the Best Paper in IET Microwaves, Antennas & Propagation. The IET Premium Award, issued by the Institute of Engineering and Technology in the UK, is a highly prestigious international award that recognises the best research paper in Microwave, Antennas & Propagation during the last two years. The winning paper, entitled “Dual-band single-layer quarter ring frequency selective surface for Wi-Fi applications” was published in IET Microwaves, Antennas & Propagation, Volume 10, Issue 4, 19 March 2016.
With the widespread anticipation of the Internet of Things in the near future and the evolving of 5G communication systems, particularly in residential areas, the number of Wi-Fi connected devices may increase exponentially. As a consequence, it is likely that some ISM frequency bands will soon become highly saturated. In certain situations, it may be useful to limit the coverage of existing and emerging wireless networks to pre-defined areas, such as an individual flat or a room and, thus, inherently minimising co-channel interference from/to neighbour Wi-Fi networks.
To this extent, the authors have proposed a new frequency selective surface (FSS) design to be used in Wi-Fi shielding applications as either a band reject or band-pass dual-band single-layer filter. The proposed design consists of a combination of basic elements, that is, ring loops/slots, and is tuned at both 2.4 and 5.2 GHz Wi-Fi frequency bands. It has a relatively stable frequency response in the aforementioned Wi-Fi bands for incidence angles ranging from 0° to 45°.
Simulation and model validation through measurements demonstrate the performance of the proposed FSS design. Active variants are also proposed and briefly evaluated, which should allow for applications where an on–off switching is desired at 2.4 and 5.2 GHz Wi-Fi bands. In a more generic case, this FSS design might also be useful for other applications where the target frequency bands have a relative offset similar to the Wi-Fi bands.
On the photo, from left to right: Rafael Caldeirinha, David Ferreira, Iñigo Cuiñas and Telmo Fernandes
Within the 22nd edition of the program “Ciência Viva no Laboratório - Ocupação Científica de Jovens nas Férias”, IT organised once again two internships, in Lisbon and Covilhã, with the aim of capturing the interest of high-school students for telecommunications. In both courses students were immersed in the research and development being done at IT, allowing them to “get into the skin” of telecommunications engineers and learn more about their daily activities.
In Lisbon, between 2-6 July, IT and IST hosted for the 7th time the INTELE (Introduction to Telecommunications). The trainees visited the laboratories, attended experimental sessions and set up "kits" for FM broadcast receivers and optical communications. As in previous editions, the hands-on activities like the assembling of the kits and the direct contact with the techniques of manufacture and testing of printed circuits were big favourites. Other activities such as the session “Desmistifying the Internet”, learning the theory about electromagnetic waves or the visit to the Faraday Museum also gathered the general enthusiasm of the young trainees.
In Covilhã, between 25-29 June IT and the Faculdade de Engenharia – University of Beira Interior (UBI) jointly organised the course “Initiation to Electronics and Telecommunications”. The trainees learned about the innovative applications of electronics and communication networks being developed in IT, as well as the main research and technological challenges for the development of mobile and wireless communications in the century XXI. In the activities that took place in the laboratory, trainees put theory to the test with the assembly of electronic kits, basic techniques of printed circuit production, experimental realization of received power measurements, binary output and other relevant measures in 4G and 5G mobile systems.