Research for High Altitude Platforms & Antenna for HAP Applications
Jul 19, 2012
from 11:00 AM to 12:00 PM
|Where||ENGR. IV Bldg., Maxwell Rm. 57-124|
|Contact Name||Prof. Yahya Rahmat-Samii|
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Wojciech J. Krzysztofik
Wrocław University of Technology, Poland
The growing demand for mobility and ubiquitous access to multimedia services call for the development of new-generation, wireless telecommunications systems. In this respect, networks are expected to fulfill the vision for optimal connectivity anywhere, anytime, providing higher bit rates at low cost. The High Altitude Platforms HAPS, allocated in to the stratosphere, can play an important role in the evolution of systems beyond 3G. The most important advantages of HAP systems are: their easy and incremental deployment, flexibility / reconfigurability, low-cost operation, low propagation delay, high elevation angles, broad coverage, broadcast / multicast capability, ability to move around in emergency situations, etc, but there are also crucial disadvantages, such as the monitoring of the station, the immature airship technology, and the stabilization of the on-board antenna. Antennas plays important role into configuration the communication system throughout the HAP. This talk deals with the fixed-beam planar microstrip antenna arrays that are envisaged for the modern communication systems, on air-platform of HAP system. In the contribution the general description of analysis and synthesis (Taylor approach) procedures for planar arrays and passive beam forming networks are described. The different microstrip planar array concepts based on (2x2) and (2x4) module sub-arrays will be discussed.
Wojciech J. Krzysztofik received his MA and PhD degrees in technical sciences with specialty in RF at Wrocław University of Technology (WUT), respectively in 1974 and 1983. Since 1974 he is employed at the Department of Electronics Engineering of the Institute of Telecommunications, Computer Networks and Acoustics - currently a lecturer in Science and Education.
Research Interests. Dr. W.J. Krzysztofik concentrated in the areas of use of radio waves and microwaves in communication and remote monitoring in the field of computational electromagnetic applications to the scatterers and antennas of any shape, placed in complex environments. Dr. Krzysztofik also conducts research on the propagation of satellite signals and mobile communications in urban areas and the effects of EM waves on living organisms. The results of their work presented in over 100 publications appearing in technical journals and conference proceedings in the country and abroad.