Warsaw University of Technology, Institute of Radioelectronics, Poland, Higher Education (HE)

Yevhen Yashchyshyn, Marek Bury
Nowowiejska 15/19
00-665 Warszawa

Phone: +48 22 234 6088
E-Mail: Y.Yashchyshyn@ire.pw.edu.pl,M.Bury@ire.pw.edu.pl

Description and expertise of the organisation:
Warsaw University of Technology (WUT) is one of the largest universities in Eastern Europe. Over 30 000 students are matriculated every year. Research and teaching is performed by over 2 000 professors and engineers. The Antenna and THz Techniques Research Group of the Radiocommunication Division of the Institute of Radioelectronics at WUT which is supposed be involved in PIANO+ has 2 professors, 5 employees and 11 PhDs.
Our research activities are related to radiocommunication systems and networks including antennas, signal processing and measurement techniques. The most important research topics include analysis, development and investigation of:
• radiocommunication systems and networks – cellular networks (3G and beyond 3G), short range systems, ad-hoc networks, satellite systems and broadband access networks, MIMO systems;
• wireless ultra-wideband systems (UWB) – methods and systems for communication and localization, systems for road safety, microwave imaging systems;
• antennas and radio channel – electrodynamic modeling and design of various types of microwave, millimeter, submillimeters wavelengths and terahertz antennas, including electronically controlled and reconfigurable antennas, photonic antennas, integrated antennas; channel modeling and simulation for MIMO, UWB and cellular systems;
• measurements – spectrum monitoring methods and systems; channel and antenna including automatic far and near-field measurements of antennas characteristics in time and frequency domain, antenna and channel pulse response, transfer functions of UWB antennas, transient states in reconfigurable antennas;
• radio frequency devices – high-efficiency resonant power amplifiers (class D, DE, E, F and G), linear wide-band short-wave amplifiers, high-power amplitude modulators, high-efficiency power supplies, power factor correctors, low-noise amplifiers, microwave filters and phase shifters

Research interests / Project ideas
Photonic-based telecommunication is well explored and described in literature. One of the most widespread solution for RF-photonic systems based on a wideband Maha–Zehnder modulator. Laser beam is driven through a ferroelectric element which is biased with modulating signal. Such modulator can be relatively easily fed with broadband RF modulating signals. A disadvantage of such solution is high cost and significant size of the modulator module that makes integration with an antenna structure rather difficult task. In present proposal an alternative solution is suggested. It is based on a direct modulation/demodulation of photonic elements. Such solution enables reduction both cost and size of the final device. However it imposes limitation to the bandwidth and maximal frequency of the modulating signal. The level of said limitation depends on the photonic element applied (laser or a diode). Those limitations resulting from the switching time of the photonic element used to make direct modulation inapplicable for usage with broadband signals. However, development in the area of photonic semiconductors has been significant in recent year and results show, that presently it is possible to realize semiconductor elements operating with high frequency broadband signals even integrated with antenna structure.
Methodology of integrating photonic element with radiating structure so as to obtain photonic antenna is a challenge itself. Techniques used for antenna design and simulations are well known and extensively presented in literature. However, integration of the photonic element requires fulfilling untypical conditions, among others tuning of the radiation impedance to meet non-standard impedances of photonic semiconductors. Therefore conception of photonic antennas is presently in rather early stage of development. Moreover from the radiation point of view it is important to minimize both number and size of the additional elements integrated with structure. Each of them may cause effects that are caused by disturbance of the field distribution and that are rather difficult to predict.
Expected result of this research is a number of experimental photonic antennas. They are supposed to be realized, measured and evaluated. There would be developed: Methods of integrating of the photodiode and laser with radiating structure; Experimental receiving, transmitting and transceiver photonic antennas; Measurement methods for photonic antennas.

photonic antenna, RF over fibre