| 1. |
- 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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| 2. |
- 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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| 3. |
- Karlsson, Kristian, 1973, et al.
(författare)
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Analysis of Wires Inside a Reverberation Chamber Using the Method of Moments Combined with Spectral Domain Techniques and Asymptotic Extraction
- 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. - 9290929375 ; 626 SP
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Konferensbidrag (refereegranskat)abstract
- In this paper we will present a Method of Moments (MoM) code that can be used for analyzing PEC objects in a Reverberation Chamber (RC). The RC is treated as a rectangular cavity, and the Green's function of it is constructed by using planar wave spectral domain techniques and imaging combined with periodic boundary conditions. Several validation cases based on comparisons with other computer codes are also presented.
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| 4. |
- Nyström, Olle, 1979, et al.
(författare)
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A Vector Beam Measurement System for 211-275 GHz
- 2006
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Ingår i: Proceedings EuCAP 2006, Nice, France, 6-10 November 2006, (ESA SP-626, October 2006). - 9290929375
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Konferensbidrag (refereegranskat)abstract
- In this paper, we describe a novel vector measurement system for the characterization of Gaussian beams and present test results for mm-wave, 211-275 GHz, receiver optics alignment. The measurement setup allows a simpler design without any PLLs and employs a combination of a single frequency source, comb-generator, and direct multiplication LO and signal sources. The system takes advantage of different harmonics to generate the required RF and LO signals yielding the desired IF frequency while obtaining perfect phase-coherence and initial phase-noise cancellation. One of the additional advantages of the suggested measuring scheme is that it allows such design that it has the potential to cover different mm and sub-mm bands by only replacing two filters and the LO multiplication unit. For example, we plan to use the same setup, with mentioned modifications, for the frequency bands 275-370 GHz and 385-500 GHz.
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| 5. |
- Sotoudeh, Omid, 1978, et al.
(författare)
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Multimode hard horn antennas with partly corrugated walls for 20/30 GHz dual-reflector antennas with multiple beams - full 3D simulations and measurements
- 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. - 9290929375 ; 626 SP
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Konferensbidrag (refereegranskat)abstract
- We introduce a partly corrugated hard horn, consisting of a smooth-walled horn with an attached longitudinally corrugated outer section. This is used and controlled to design better and shorter single-band horns than otherwise possible. Furthermore, it enables the design of dual-band horns with low cross-polarization and high gain, for multi function use at Ka-band with transmit and receive frequencies in the same antenna. A model of such a dual-band horn was manufactured at Saab Ericsson Space and measured. The design was done by using efficient in-house mode matching code based on homogenized asymptotic boundary conditions for the corrugations. This has been verified by heavy computations using a 3-D FDTD code. The measured laboratory model had too large cross polar sidelobes, but the later extensive computations showed that these sidelobes would have been in agreement with the mode matching results if the number of corrugations was doubled.
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