Papers by Georgios Tsachtsiris
17th International Conference on Applied Electromagnetics and Communications, 2003. ICECom 2003.
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17th International Conference on Applied Electromagnetics and Communications, 2003. ICECom 2003.
ABSTRACT Four-element antenna diversity systems suitable for operation in diversity and MIMO wire... more ABSTRACT Four-element antenna diversity systems suitable for operation in diversity and MIMO wireless devices for single (2.4 or 5.2 GHz) and dual band operation are addressed. The antenna elements used are the Minkowski, the Inverted F and the Koch monopole. The calculated envelope cross correlation and mean effective gain of the antennas satisfy the criteria for achieving good diversity performance. The impact of the mutual coupling between the antenna elements on their radiation efficiency and mean effective gain is also addressed indicating that the type of the antennas, their placement and their electrical distance are key parameters in the design of an efficient multi element antenna system.
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2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03., 2003
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2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03., 2003
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Microwave and Optical Technology Letters, 2004
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IEEE Transactions on Antennas and Propagation, 2008
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IEEE Transactions on Antennas and Propagation, 2004
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IEEE Antennas and Propagation Magazine, 2002
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Automatika, 2004
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International Journal of Applied Research in Management and Economics, 1970
This paper examines whether electronically developed countries are gaining more from investments ... more This paper examines whether electronically developed countries are gaining more from investments in information and communication technology (ICT) products. Previous research in the field has extensively used the GDP per capita as an index for country categorization into developed, emerging and developing. Instead, we make use of the UN’s electronic government development index (EGDI) in order to construct two groups of countries based on their level of electronic development for the period 2007-2016. We use panel data regressions to estimate an augmented Cobb-Douglas production function for each of these two groups as well as the combined sample of all countries. The results indicate that ICT output elasticities are positive and statistically significant for both group of countries, with electronically developed countries having an edge over less developed. Moreover, the hypothesis of equal ICT elasticities between the two groups could not be rejected, suggesting that electronicall...
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—The integration of compact printed multielement antenna (MEA) systems on small diversity and mul... more —The integration of compact printed multielement antenna (MEA) systems on small diversity and multiple input multiple output (MIMO) terminal devices operating in the 5.2 GHz Industrial , Scientific and Medical (ISM) band is presented. The investigated MEA systems comprise up to six printed elements (inverted F and Minkowski monopole antennas) and their performance is evaluated by means of the effective diversity gain (EDG) and the 1% outage MIMO capacity. The role of the propagation environment (both outdoor and indoor) on EDG is examined, proving that the uniform scenario is a good approximation to many real environments. The tradeoff study between system's performance and number of integrated antenna elements indicates that both diversity and MIMO performance saturate when placing more than five closely spaced elements. Even the least efficient 6-element system however, can be advantageously used as a reconfigurable 2-element array under the concept of receive antenna selection, since it provides significantly improved MIMO performance over a conventional 2-element fixed one. The paper concludes with a summary of useful guidelines for the MEA design optimization procedure that emanated from this study. Index Terms—Antenna diversity, antenna selection, diversity gain, multiple input multiple output (MIMO) capacity, monopole antennas, printed circuit antennas.
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Papers by Georgios Tsachtsiris