Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Johan Wettergren"'
Publikováno v:
2022 16th European Conference on Antennas and Propagation (EuCAP).
Publikováno v:
IEEE Transactions on Antennas and Propagation, 67(5):8606072, 2992-2999. Institute of Electrical and Electronics Engineers
A uniformly excited slotted waveguide (WG) antenna array for point-to-point communication is presented. The European Telecommunications Standards Institute class-II sidelobe level requirements are satisfied in all planes at almost all frequencies by
Publikováno v:
2020 14th European Conference on Antennas and Propagation (EuCAP).
A triband rod antenna is presented. It is intended for reception of AM, FM, DAB and TV in vehicles. The antenna uses coil traps to facilitate multiple resonant lengths in order to be matched to 50 Ohms for frequency bands centred at 97, 204 and 571 M
Publikováno v:
IEEE Transactions on Antennas and Propagation. 64:4872-4877
Global optimization methods can be employed to design aperiodic array antennas that accurately account for their electromagnetic (EM) behavior and complex performance specifications. However, they are computationally expensive and, therefore, limited
Autor:
Rob Maaskant, Johan Wettergren, Thomas Emanuelsson, Martin Johansson, Wan-Chun Liao, Michael Dieudonne, Marianna Ivashina, Anders Höök
Publikováno v:
2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC).
Initial technology and design decisions are presented as part of a design flow to realize an active integrated antenna (array) element for 5G applications at Ka-band. The objective is to synthesize an antenna impedance that directly matches the ampli
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 14:159-162
An optimization framework is proposed that combines electromagnetic field simulations with an iterative ${\ell _1}$ -norm minimization procedure to synthesize optimally sparse antenna arrays. The proposed approach overcomes the limitation of design m
Publikováno v:
2016 10th European Conference on Antennas and Propagation (EuCAP).
A small array for Earth coverage from geostationary orbit has been designed. It consists of seven patch excited cup radiators, polarizing networks and distribution networks. It can replace the conventional horns, because it has equal RF performance,
Publikováno v:
2016 10th European Conference on Antennas and Propagation (EuCAP).
An isoflux helix antenna has been developed for a higher edge of coverage gain than any previous design. The design is fit for space use in terms of thermal and structural performance. Excellent agreement with the predicted radiation pattern has been
Publikováno v:
Acta Astronautica. 65:1765-1771
The ESA SWARM mission will consist of three satellites that will measure the Earth magnetic field. The system calls for metre accuracy knowledge of the measurement locations. To achieve this a GPS receiver is used. At least four GPS signals are track
Autor:
Johan Wettergren
Publikováno v:
European Journal of Engineering Education. 27:105-111
Electrical engineering students were interviewed in order to reveal their understanding of important physics concepts needed for a semiconductor physics course. In particular, the concepts of diffusion, holes and doping were studied. We found that a