Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Tiago Varum"'
Publikováno v:
Sensors, Vol 24, Iss 8, p 2408 (2024)
Wireless communication systems have grown rapidly, moving towards being highly compact, intelligent, and flexible to adapt to changing operating requirements. Multifunctional and highly versatile antennas are key in this development to ensure system
Externí odkaz:
https://doaj.org/article/a9277b47ec0342a8a8e87f6d470e3d07
Publikováno v:
IEEE Access, Vol 11, Pp 143143-143166 (2023)
In the most recent years multiple-input multiple-output (MIMO) antennas have been widely implemented to take advantage of the opportunity in controlling their radiation pattern and/or polarization in overcoming modern telecommunication systems issues
Externí odkaz:
https://doaj.org/article/95f0c6665b91479ba84f6bbaaf75679a
Publikováno v:
IEEE Access, Vol 11, Pp 10687-10695 (2023)
This paper presents a new passive vector modulator phase shifter (VMPS) based on a polar architecture suitable for use in advanced beamforming feeding networks. The cascaded structure of a reflection-type bi-phase variable attenuator (RTBVA) and a re
Externí odkaz:
https://doaj.org/article/5aded1df865d436d8439581818a3d27d
Publikováno v:
IEEE Access, Vol 8, Pp 77179-77187 (2020)
Reconfigurable antennas play an important role in wireless communication systems as the physical and electrical properties of their structures can be modified, allowing them to be used in different applications. In this paper two reconfigurable filte
Externí odkaz:
https://doaj.org/article/7f597454dd04448faf4f6489a759adcb
Publikováno v:
IEEE Access, Vol 8, Pp 212855-212864 (2020)
Vector modulators (VM) and phase shifters are essential components in phased array antennas with electronic beam steering. This work presents an IQ reflection-type vector modulator using PIN diodes, designed and implemented to operate at 28 GHz. An e
Externí odkaz:
https://doaj.org/article/e5d9d9d0d97f4f4da48c545badc7a71d
Publikováno v:
IEEE Access, Vol 8, Pp 177064-177083 (2020)
Three-dimensional (3D) printing technology is an area of research that has received great attention in the last decade and it is pointed out by many as the future of manufacturing. 3D printing can be described as an additive process that creates a ph
Externí odkaz:
https://doaj.org/article/2457c8977b0b423e9b58df04e0cb19da
Publikováno v:
Applied Sciences, Vol 11, Iss 14, p 6267 (2021)
Modern communication systems require high bandwidth to meet the needs of the huge number of sensors and the growing amount of data consumed, and an exponential growth is expected in the future with the integration of internet of things networks. Spec
Externí odkaz:
https://doaj.org/article/07749018c05f4fceb35b715bf6f5dade
Publikováno v:
Sensors, Vol 21, Iss 10, p 3321 (2021)
With the rise of 5G, Internet of Things (IoT), and networks operating in the mmWave frequencies, a huge growth of connected sensors will be a reality, and high gain antennas will be desired to compensate for the propagation issues, and with low cost,
Externí odkaz:
https://doaj.org/article/b1fc426469a843329ecb27bb2678a1d0
Publikováno v:
Applied Sciences, Vol 10, Iss 23, p 8640 (2020)
In many countries, terrestrial broadcasting is the main delivery medium for television. In this paper, we propose a small-volume practical receiving antenna. Our design consists of a linear array of three vertically placed patch antennas which increa
Externí odkaz:
https://doaj.org/article/ed9e99b33b094a8792391fce8f461b85
Publikováno v:
Sensors, Vol 20, Iss 21, p 6366 (2020)
This paper presents a simple, compact and low-cost design method that allows one to obtain low-profile multi-band antennas for the overcrowded future generation networks, which are widely versatile and very heterogeneous in the K/Ka bands. The propos
Externí odkaz:
https://doaj.org/article/43f2bcddfac947f3a538bfbcde12c4b7