Prof Yevhen Yashchyshyn of Warsaw University of Technology

Intelligent (smart) or adaptive antennas are the most suitable for wireless communication, especially for fifth-generation and higher communication systems. The key property of intelligent technology is the ability to respond automatically by changing an appropriate radiation pattern. Phase-array-based smart antennas are used as the main beamforming structure.  A time–modulated antenna array (TMAA) can serve as a cheaper alternative.

Outline, Part I

• Introduction
• Smart Antenna – Auditory and Electronic System
• What is a Smart Antenna? Why is Smart Antenna Important?
• Amplitude and Phase Weighting or Taper
• Beamforming
• Switched vs. Adaptive Beamforming
• Adaptive Array and Adaptive Beamforming
• Spatial Division Multiple Access (SDMA)
• Optimal beamforming Techniques (MMSE, LMS)
• Direction-of-Arrival Algorithms (Bartelett, Capon, MUSIC, ESPRIT)

Outline, Part II

• 4-D Antennas for Beamforming
• Motivation
• Mathematical formulation
• Examples of  TMAAs:
• Measurement facility and Results of experiments
• SMILE  - Spatial Multiplexing of Local Elements
• Conclusion

Printed antennas, known for their advantages such as lightweight design, low profile, affordability, seamless integration with other devices, and efficient mass production, are widely used in the microwave frequency range. The likelihood of their widespread adoption extends to the Sub-THz frequency range (100–300 GHz). However, most printed antennas exhibit a narrow relative bandwidth (2–3%), which often limits their capabilities in the microwave range. Concurrently, at sub-THz, the 2–3% band spans 2–6 GHz, enabling devices to realize the benefits of this band, such as ultrafast data transmission and high-quality radar images. Nevertheless, the broad application of printed antennas at sub-THz frequencies faces a significant obstacle: surface-wave (SW)-induced low radiation efficiency, which diminishes the antenna's effective radiated power. SW diffraction at the edges of the antenna substrate also deforms the radiation pattern. As the SW intensity increases with the electrical thickness of the dielectric substrate, this effect becomes more pronounced at sub-THz frequencies than in the microwave range.

Biography:

M.Sc. (’79, Lviv), Ph.D. (’86, Moscow), D.Sc. (’06, Warsaw), Prof. Title (2015. Poland); antennae and antenna array, sub-Terahertz technologies; Professor, Sub-Terahertz Technology Division of Warsaw University of Technology, Head (2020-). Senior Member of IEEE; Member of the Committee on Electronics and Telecommunications of the Polish Academy of Sciences (2000-); Member of the Microwave and Radiolocation Section and the Telecommunication Section of the Electronics and Telecommunication Committee of the Polish Academy of Sciences (’07-); Senior Researcher of The Institute of High Pressure Physics of the Polish Academy of Sciences; Adjunct Professor of Northwestern Polytechnical University, Xi'an, China;  TPC and Organizing Committee Member of Conferences: MIKON, TCSET,  CADSM;  Reviewer of the IEEE Transactions on Microwave Theory and Techniques (’04-), IEEE Transactions on Antennas and Propagation (’06-) and IEEE Microwave and Wireless Components Letters (’04-); Member of Editorial Board of Izwestiya Wuzow Radioelektronika (’09-).

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