| 1. |
- Gevorgian, Spartak, 1948, et al.
(författare)
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Electronically scanning beamformers based on ferroelectric technology
- 2005
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Ingår i: Frequenz. - 0016-1136. ; 59:1-2, s. 40-48
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Tidskriftsartikel (refereegranskat)abstract
- Basic properties and the potential of ferroelectrics for applications in electronically scanned beamformers are discussed. Low drive power consumption, relatively low losses, high speed, and the possibilities of realisation cost effective beamformers are the main advantages offered by ferroelectric technology. A brief review of ferroelectric scanning antennas is also given.
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| 2. |
- Jamaly, Nima, 1979, et al.
(författare)
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A Revisit to Spatial Correlation in Terms of Input Network Parameters
- 2012
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Ingår i: IEEE Antennas and Wireless Propagation Letters. - 1548-5757 .- 1536-1225. ; 11, s. 1342-1345
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Tidskriftsartikel (refereegranskat)abstract
- An alternative compact formula in terms of input network parameters for calculation of envelope correlations is provided. The main advantage of this formula is that it can be simply modified to include cases of lossy structures and general cases of correlated nonuniform multipath environments. This formula is based on the open-circuit covariance matrix of the multiport antennas. The latter can be either estimated or quickly measured in a reverberation chamber, which removes the need for costly measurements of the embedded far field patterns.
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| 3. |
- Jamaly, Nima, 1979, et al.
(författare)
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Coupling effects on richness threshold of multi-port antennas in multipath environments
- 2012
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Ingår i: 15th International Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 2012, Toulouse, 25-28 June 2012. - 9781467302906
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Konferensbidrag (refereegranskat)abstract
- This paper investigates convergence in diversity gain of multi-port antennas in non-rich multipath environments. It is shown that diversity gain convergence is faster in the presence of strong coupling. In this situation, richness threshold is also smaller. Furthermore, by linking convergence in diversity gain to convergence in antenna ports' correlations, the role of pattern diversity caused by coupling is highlighted. A range of variation for correlations is defined whose upper bound is used to quantify pattern diversity. The lower bound for this range is the corresponding spatial correlation in a rich multipath environment.
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| 4. |
- Jamaly, Nima, 1979, et al.
(författare)
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Efficiency characterisation of multi-port antennas
- 2012
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 48:4, s. 196-197
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Tidskriftsartikel (refereegranskat)abstract
- A simple radiation efficiency metric is introduced to include the effects of non-ideal source/receiver impedances. The features of this parameter are highlighted and its compact formula is derived. The notion of mean matching efficiency is established. Simulations prove that this matching efficiency is quite useful in a quick estimation of diversity performance of multi-port antennas in rich isotropic multipath environments.
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| 5. |
- Jamaly, Nima, 1979, et al.
(författare)
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Multi-port matching efficiency in antenna systems with cascaded networks
- 2012
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Ingår i: 15th International Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 2012, Toulouse, 25-28 June 2012. - 9781467302906
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Konferensbidrag (refereegranskat)abstract
- A general compact formula for multi-port matching efficiency in the presence of an arbitrary number of cascaded networks is introduced. A comparison between the decoupling efficiency and multi-port matching efficiency is presented. Similarly, a compact formula for decoupling efficiency in a cascaded chain is provided. The presented compact formulas are quite advantageous for optimization of radiation efficiencies by designing a proper matching network.
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| 6. |
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| 7. |
- Kildal, Per-Simon, 1951, et al.
(författare)
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In Memoriam: Olof Dahlsjö
- 2013
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Ingår i: IEEE Antennas and Propagation Magazine. - 1045-9243. ; 55:2, s. 142-142
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The antenna and radome activities at Ericsson were initially related to the development of military airborne radar. Under Olof Dahlsjö's leadership, they also developed into other types of radar, as well as communications for ground, airplane, and space applications. The activity became world leading with a solid scientific foundation, examples of which are polarization-twisting, satellite antennas for scientific pro grams, and phased arrays. The latter were initially done together with the research group of Prof. Folke Bolinder at Chalmers, and several people from his group later started to work for Olof Dahlsjö.
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| 8. |
- Papageorgiou, I., et al.
(författare)
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An E-band cylindrical reflector antenna for wireless communication systems
- 2013
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Ingår i: 7th European Conference on Antennas and Propagation, EuCAP 2013. ; 2013, s. 524-528
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Konferensbidrag (refereegranskat)abstract
- The increasing demand of radio links with high data rates is satisfied by the allocation of new frequency spectrum. A novel cylindrical reflector antenna is designed to operate in the E-band (71-86 GHz), which was already allocated in 2003 for radio link applications. Presented simulation results are preliminary and the directivity of the antenna at the center frequency is calculated to be 41.4 dBi with an aperture efficiency of 60% or -2.2dB.
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| 9. |
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