Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Ulf Johannsen"'
Autor:
Javier Pérez Santacruz, Elmine Meyer, Roel X. F. Budé, Catalina Stan, Antonio Jurado-Navas, Ulf Johannsen, Idelfonso Tafur Monroy, Simon Rommel
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-13 (2023)
Abstract Adaptive analog beamforming is a key technology to enable spatial control of millimeter-wave wireless signals radiated from phased array antennas (PAAs) which is essential to maximize the capacity of future mobile networks and to ensure effi
Externí odkaz:
https://doaj.org/article/66f4f51fa05b4434a0f552a06531b764
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 4, Pp 860-870 (2023)
Active millimeter-wave beamforming arrays and focal plane array antennas require extensive calibration to compensate for impairments, such as phase and gain variations between elements, as well as unintended coupling between changes in gain and phase
Externí odkaz:
https://doaj.org/article/9b2294c82d584e938ebee9fd6fc629dd
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 4, Pp 799-814 (2023)
Quantification of uncertainties in the results of channel sounding measurements is important for their interpretation and further usage. In this paper, a novel uncertainty analysis methodology to quantify uncertainties of condensed parameters in meas
Externí odkaz:
https://doaj.org/article/ffb6a5707be14753a6a342af94191281
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 3, Pp 112-123 (2022)
A new antenna system concept is presented where a wide-scan focal plane array antenna is used to achieve point-to-multipoint communication. The focal plane of a parabolic toroid reflector is populated with several antenna arrays, the positions of whi
Externí odkaz:
https://doaj.org/article/a60c0ebf274448bb8f9c9daee6a97857
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 2, Pp 746-758 (2021)
This article reviews the current state-of-the-art of millimeter-wave (mm-wave) antennas for communication and sensing applications in the D-band between 110 and 170 GHz. The most popular design techniques, including Antenna-on-Board (AoB), slotted wa
Externí odkaz:
https://doaj.org/article/0ed60989890c4914a9d5cbd95296a17a
Autor:
Thomas A. H. Bressner, Amr Elsakka, Amirashkan Farsaei, Martin N. Johansson, Oleg A. Iupikov, Rob Maaskant, A. Bart Smolders, Ulf Johannsen
Publikováno v:
IEEE Access, Vol 9, Pp 127141-127149 (2021)
Fixed-beam, high-gain antenna systems can be used for a finer partitioning of the currently used cell-sectoring. This partitioning has the benefit of reducing the number of users seen per antenna beam, which reduces interference. Furthermore, the hig
Externí odkaz:
https://doaj.org/article/105409bd8b4c436bb4b7018adecaa5e4
Autor:
Javier Pérez Santacruz, Simon Rommel, Ulf Johannsen, Antonio Jurado-Navas, Idelfonso Tafur Monroy
Publikováno v:
Applied Sciences, Vol 10, Iss 11, p 3891 (2020)
5G mobile networks aim to support a large variety of services with different and demanding requirements. To achieve this, analog radio over fiber (ARoF) fronthaul along with millimeter-wave (mmWave) cells is a strong candidate to be part of the 5G ar
Externí odkaz:
https://doaj.org/article/0e297d31293f4731a689cfc57a6149b4
Publikováno v:
IEEE Microwave Magazine. 24:107-117
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::029246d02e0481961e18aca128ab14a2
https://doi.org/10.1109/mmm.2023.3242841
https://doi.org/10.1109/mmm.2023.3242841
Publikováno v:
IEEE Transactions on Antennas and Propagation, 71(4), 3260-3272. Institute of Electrical and Electronics Engineers
An active transmitarray antenna is presented for Ka-band monopulse tracking radar in the 34-36-GHz range. A novel contribution is the application of commercial SiGe-based 5G beamforming chips in a large-scale naval radar array, demonstrating how deve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e114c7f3cab215c89eba51335f432257
https://doi.org/10.1109/TAP.2023.3240557
https://doi.org/10.1109/TAP.2023.3240557
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques, 71(3), 1093-1101. Institute of Electrical and Electronics Engineers
Active integrated antennas (AIAs) are used in low-noise receivers for their good noise performance compared with their nonintegrated counterparts. However, it is challenging to accurately determine one of these antennas' most important characteristic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c92fa60974b3f8a52aac7ef0ae9221b3
https://research.tue.nl/en/publications/735d1931-0466-43b2-bee2-b4f3d7c7b235
https://research.tue.nl/en/publications/735d1931-0466-43b2-bee2-b4f3d7c7b235