| 1. |
- Volski, V., et al.
(författare)
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Overview of the software integration activities within ACE
- 2006
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Ingår i: First European Conference on Antennas and Propagation (EuCAP), 2006, Nice, France, 6 - 10 November 2006. - : IEEE. - 0379-6566. - 9789290929376 ; 626 SP
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Konferensbidrag (refereegranskat)abstract
- The ACE project initiated the start of several integration activities between European institutions involved in electromagnetic modeling of antennas with planar or conformal topologies. The goal of the integration activities was / is not to create a global software package that integrates the software of all partners, but to initiate a long term process for antenna software integration activities within the European antenna community. During the first two years of ACE the integration activities were performed in several groups with a rather small number of partners in each group. The groups were formed by partners who wanted to integrate a specific approach developed by one partner into the software code of another partner. This allows increasing the capability and efficiency of a software code. In this paper a short overview of all integration activities is given.
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| 2. |
- Carlsson, Jan, 1962
(författare)
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Results and experiences from two years of benchmarking of measurements facilities for small antennas and terminals within ACE
- 2006
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Ingår i: European Conference on Antennas and Propagation: EuCAP 2006; Nice; France; 6 November 2006 through 10 November 2006. - : IEEE. - 0379-6566. - 9789290929376 ; 626 SP
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Konferensbidrag (refereegranskat)abstract
- This paper presents the test cases defined in ACE (European Antenna Centre of Excellence) for benchmarking of facilities for measuring small mobile terminals and antennas, as well as results and experiences of the round robin test. The emphasis is put on measurements in the most popular communication frequency bands. Several test cases for passive antennas as well as for active devices were defined and collected in a test kit that was sent to different test facilities around Europe in a round robin test. The measured parameters include radiation efficiency, total radiated power, diversity gain and receiver sensitivity. The test cases include different locations of the test devices relative to a lossy cylinder that has dielectric characteristics resembling that of a human head.
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| 3. |
- Diallo, A., et al.
(författare)
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Reverberation chamber evaluation of multi-antenna handset having low mutual coupling and high efficiencies
- 2006
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Ingår i: European Conference on Antennas and Propagation: EuCAP 2006; Nice; France; 6 November 2006 through 10 November 2006. - 0379-6566. - 9789290929376 ; 626 SP
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Konferensbidrag (refereegranskat)abstract
- This paper presents the evaluation of the diversity performances of several multi-antenna structures in a reverberation chamber. Firstly, a two-antenna system having low isolation between the radiators is measured. Its performances are compared with a second structure which uses a neutralization technique to enhance the radiating element's isolation. Then the performances of a four-antenna system with and without the neutralization method are measured and presented. Particularly, the total antenna efficiencies, the envelope correlation coefficients and the diversity gain of these systems are presented and discussed. We especially focus on the advantages of the neutralization technique.
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| 4. |
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| 5. |
- Beckman, Claes, 1962-, et al.
(författare)
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Verifying 3G licence requirements when every dB is worth a billion
- 2006
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Ingår i: First European Conference on Antennas & Propagation. - 9789290929376 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- In the year 2000, the Swedish Telecom regulator: “Post&Telestyrelsen”, PTS, granted in a “beauty contest” four licenses for operations of 3G systems. To verify the coverage and the license requirements, PTS, has developed a test procedure where the field strength of the primary Common Pilot Channel, CPICH, is measured in a drive test. Designing such a test constitutes a number of challenges mainly due to the fact that in 3G the accuracy in the measurement needs to be extremely high since even a small systematic error of ~1dB could in Sweden have the consequence that each operator would have to build an extra +1000 sites at a staggering cost of ~1billion SEK!The present paper gives an overview of the considerations behind the design of the test method used for verification of the 3G licence requirements in Sweden.
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| 6. |
- Beckman, C., et al.
(författare)
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Verifying 3G license requirements when every dB is worth a billion
- 2006
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Ingår i: Eur Space Agency Spec Publ ESA SP. - : IEEE. - 9290929375 - 9789290929376
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Konferensbidrag (refereegranskat)abstract
- In the year 2000, the Swedish Telecom regulator: "Post& Telestyrelsen", PTS, granted in a "beauty contest" four licenses for operations of 3G systems. To verify the coverage and the license requirements, PTS, has developed a test procedure where the field strength of the primary Common Pilot Channel, CPICH, is measured in a drive test. Designing such a test constitutes a number of challenges mainly due to the fact that in 3G the accuracy in the measurement needs to be extremely high since even a small systematic error of ∼1dB could in Sweden have the consequence that each operator would have to build an extra +1000 sites at a staggering cost of ∼1bilion SEK! The present paper gives an overview of the considerations behind the design of the test method used for verification of the 3G licence requirements in Sweden.
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| 7. |
- Blomberg, Erik, 1987, et al.
(författare)
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Simulated biomass retrieval from the spaceborne tomographic Saocom-CS mission at L-band
- 2016
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Ingår i: European Space Agency, (Special Publication) ESA SP. - 0379-6566. - 9789292213053 ; 740
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Konferensbidrag (refereegranskat)abstract
- This paper presents an evaluation of above-ground biomass (ABG) retrieval in boreal forests using simulated tomographic synthetic-aperture radar (SAR) data corresponding to the future SAOCOM-CS (L-band 1.275 GHz) mission. Using forest and radar data from the BioSAR 2008 campaign at the Krycklan test site in northern Sweden the expected performance of SAOCOM-CS is evaluated and compared with the E-SAR airborne Lband SAR (1.300 GHz). It is found that SAOCOM-CS data produce retrievals on par with those obtained with E-SAR, with retrievals having a relative RMSE of 30% or less. This holds true even if the acquisitions are limited to a single polarization, with HH results shown as an example.
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| 8. |
- Bosiljevac, M., et al.
(författare)
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Hybrid spectral domain - UTD method applied to conformal antenna analysis
- 2006
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Ingår i: Eur Space Agency Spec Publ ESA SP. - : IEEE. - 9290929375 - 9789290929376
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Konferensbidrag (refereegranskat)abstract
- A hybrid spectral domain - UTD method (Uniform Theory of Diffraction) developed for the analysis of conformal antennas is presented in this paper. The basic idea behind the hybrid method is to combine different analysis methods for conformal antennas and, at the same time, preserve the advantages of the considered methods. More specifically, the considered hybrid SD - UTD method joins the possibility of analyzing multilayer structures (spectral domain method) and the possibility of analyzing electrically large structures (UTD method). Hence, using the developed method it is possible to analyze large multilayered conformal antennas with high accuracy and speed. This work has been made possible by the ACE program for structuring the research on conformal antennas in Europe. The developed method is a result of joining research activities of University of Zagreb, Croatia and the Royal Institute of Technology, Sweden.
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| 9. |
- Cordoba-Jabonero, Carmen, et al.
(författare)
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Assessments for possible habitability in Martian polar environments : Fundaments based in ice screening of UV radiation
- 2004
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Ingår i: ESA SP. - 0379-6566 .- 1609-0438. ; 545, s. 187-188
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Tidskriftsartikel (refereegranskat)abstract
- We present a study of the solar UV radiation in Martian high latitude environments covered by ice, where the UV propagation through the polar cover depends on the ice radiative properties (layers of H2O or CO 2 ice). But also we will investigate the changes in the subsurface UV levels induced by the seasonal variations of solar UV flux on the surface, as well as by the seasonal freezing-thawing and related CO2 sublimation processes. The biological dose relative to DNA-damage will be also estimated for biological implication assessments. All these studies will be compared with the biological dose received in the Antarctic snow-ice covered environment which is seasonally exposed to high UV radiation levels (formation of "ozone hole"), where the environmental conditions could be similar to those present on Mars
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| 10. |
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