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- Carlsson, Jan, 1962, et al.
(författare)
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EMEC - An EM simulator based on topology
- 2004
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Ingår i: IEEE Transactions on Electromagnetic Compatibility. ; 46:46, s. 353-358
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Tidskriftsartikel (refereegranskat)
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| 4. |
- Carlsson, Jan, 1962, et al.
(författare)
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Validation of shielding effectiveness measurement method using nested reverberation chambers by comparison with aperture theory
- 2012
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Ingår i: International Symposium on Electromagnetic Compatibility, EMC EUROPE 2012.
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Konferensbidrag (refereegranskat)abstract
- In this paper we revisit existing methods for measuring the shielding effectiveness of material samples using nested reverberation chambers. These methods have the advantage of exposing the sample with a more realistic environment than other methods that are based on single plane wave excitation. That is, in the reverberation chamber the sample is exposed to fields with different incidence directions and polarizations resulting in that the average shielding effectiveness can be measured. We show by comparison with aperture theory that the measured shielding effectiveness corresponds to the theoretical value. We show also by measurements that a corrugation or choke on the periphery of an aperture can be used for increasing the shielding effectiveness for a narrow frequency range.
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| 5. |
- Condo Neira, Edith, 1979, et al.
(författare)
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Combined LTE and IEEE 802.11p Antenna for Vehicular Applications
- 2015
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Ingår i: Antennas and Propagation (EuCAP) Proceedings of the 9th European Conference, Lisbon, Portugal, April 2015. - 9788890701856 ; , s. Art. Nr 7228685-
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Konferensbidrag (refereegranskat)abstract
- Vehicles may contain multiple antennas for different applications. Among all of them, Vehicle-to-Vehicle and Vehicle-to-Infrastructure (V2X) is one of the most recent applications. This new technology focuses on traffic safety and traffic efficiency. In this paper we present a new compact antenna module suitable for vehicular applications. This module could be easily integrated into the rear-spoiler on a vehicle. The module consists of two identical monopoles for V2X applications based on the IEEE 802.11p standard and two identical printed inverted F-antennas for Long-Term Evolution (LTE) communications. The evaluation of the proposed module is done by analyzing the simulated and measured antenna S-parameters, antenna efficiencies, radiation patterns, as well as by calculating the diversity performance. The results show that the antennas are well matched and well isolated for both LTE and V2X and exhibits a radiation pattern close to the desired omnidirectional in the horizontal plane for V2X. The two LTE antennas have radiation patterns that complement each other ensuring an omnidirectional coverage by combination. Furthermore the module presents good radiation efficiency for both LTE and V2X.
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| 6. |
- Condo Neira, Edith, 1979, et al.
(författare)
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Evaluation of V2X Antenna Performance Using a Multipath Simulation Tool
- 2014
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Ingår i: Antennas and Propagation (EuCAP), Proceedings of the 8th European Conference, The Hague, The Netherlands, Apr. 2014. - 9788890701849 ; , s. 2534-+, s. 2534-2538
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Konferensbidrag (refereegranskat)abstract
- Antennas are one of the key components for efficient and reliable vehicular communications systems; especially for safety related applications the antenna performance is crucial. It is therefore important to be able to evaluate the antenna performance under realistic conditions so that the best antenna solution can be selected. In this paper we present a statistical method for evaluating the antenna performance by using the antennas radiation patterns and a multipath simulation tool. The multipath environment is generated by a number of incident waves with a specific angle of arrival distribution, defined by the user. In order to generate voltage samples at the antenna ports many sets of incident waves are generated. This simulates a changing environment as, e.g., when the vehicle is moving. By studying the cumulative distribution functions (CDFs) for the voltage samples we are able to compare the performance for different antenna types, positions on the vehicle, etc. The method is fast and effective and, when applied to typical vehicular propagation environments, the importance of having antennas with radiation patterns capable of covering the whole azimuth plane is demonstrated.
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- Karlsson, Kristian, 1973, et al.
(författare)
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Analysis and optimization of MIMO capacity by using circuit simulation and embedded element patterns from full-wave simulation
- 2010
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Ingår i: 2010 International Workshop on Antenna Technology (iWAT 2010), 1-3 March 2010, Lisbon, Portugal. - 9781424448838
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Konferensbidrag (refereegranskat)abstract
- A method for analyzing and optimizing multi-port antennas in MIMO systems is presented and exemplified. The method is based on work presented and uses data from full wave electromagnetic field (EM) solvers in combination with circuit simulations for efficient calculations of radiation properties of multi-port antennas. Here it is shown that the method can also be used for simulations of antennas in a MIMO system. The main advantage of the proposed method is that only a few full-wave simulations, which usually are time consuming, are needed when e.g. optimizing the matching circuits for a multi-port antenna. Since embedded element patterns are used, MIMO capacity (and of course all other relevant antenna parameters) can efficiently be computed for any matching network connected to the antenna ports and for different channel models, both statistical and deterministic.
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