U
Ulf Johannsen
Researcher at Eindhoven University of Technology
Publications - 113
Citations - 676
Ulf Johannsen is an academic researcher from Eindhoven University of Technology. The author has contributed to research in topics: Antenna (radio) & Computer science. The author has an hindex of 11, co-authored 89 publications receiving 434 citations. Previous affiliations of Ulf Johannsen include University of Hamburg & Hamburg University of Technology.
Papers
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Journal ArticleDOI
Axial Ratio Enhancement for Circularly-Polarized Millimeter-Wave Phased-Arrays Using a Sequential Rotation Technique
A.B. Smolders,Ulf Johannsen +1 more
TL;DR: In this article, the authors demonstrate how the axial ratio can be retained by compensating the amplitudes and phases of the individual antenna elements in linearly polarized dipoles using a sequential rotation scheme.
Proceedings ArticleDOI
A 71GHz RF energy harvesting tag with 8% efficiency for wireless temperature sensors in 65nm CMOS
Hao Gao,Marion K. Matters-Kammerer,Pieter Harpe,Dusan Milosevic,Ulf Johannsen,Arthur van Roermund,Peter Baltus +6 more
TL;DR: This paper presents the first monolithically integrated RF-power harvesting 71 GHz wireless temperature sensor node in 65nm CMOS technology, containing a monopole antenna, a 71 GHz RF power harvesting unit with storage capacitor array, an End-of-Burst monitor, a temperature sensor and an ultra-low-power transmitter at 79 GHz.
Journal ArticleDOI
On-Chip Antenna Integration for Millimeter-Wave Single-Chip FMCW Radar, Providing High Efficiency and Isolation
TL;DR: The proposed approach suppresses surface waves and meets the specific FMCW radar requirements, such as a more than 25-dB isolation between the transmitting and receiving antennas.
Journal ArticleDOI
5G RAN architecture based on analog radio-over-fiber fronthaul over UDWDM-PON and phased array fed reflector antennas
Dimitrios Konstantinou,Thomas A. H. Bressner,Simon Rommel,Ulf Johannsen,Martin Johansson,Marianna Ivashina,A. Bart Smolders,Idelfonso Tafur Monroy +7 more
TL;DR: This manuscript introduces a 5G radio access network architecture concept based on ultra-dense wavelength division multiplexing (UDWDM) and incorporating an optical fronthaul network that uses a novel wireless antenna system for radio frequency transmission and reception.
Proceedings ArticleDOI
Substrate loss reduction in antenna-on-chip design
TL;DR: In this article, the effect of the silicon substrate on the off-chip radiation of an integrated antenna on chip has been explained and a low-cost approach for an enhanced antenna-on-chip design has been derived and its improved radiation effciency has been confirmed by measurements.