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ACTUALITIES - "Reconfigurable Multifunctional Antennas" - IEEE Seminar

"Reconfigurable Multifunctional Antennas" - IEEE Seminar (30-03-09)

The IEEE Lebanon Section cordially invites you to the seminar titled:
“Reconfigurable Multifunctional Antennas”
By IEEE AP-S distinguished lecturer
Dr. Christos g. Christodoulou
Date & Time:  
Monday March 30, 2009 3:00 – 4:00 p.m., Friends Hall, Notre Dame University
Tuesday March 31, 2009, 12:30-2:00 p.m., RCR – Bechtel Building, American University of Beirut

Abstract: The requirements for increased functionality, such as direction finding, weather radar, satellite communications, within a confined volume, place a greater burden in today’s transmitting and receiving systems. A solution to this problem is the re-configurable antenna. Antennas that can be used for multiple purposes that function over several frequency bands and that can be integrated on a package for mass-production are the ultimate goals of antenna investigators.  Furthermore, applications of such systems in personal and satellite communications impose the requirement for elements miniaturized in size and weight.
Key-elements to obtain reconfigurability in many RF circuits are the Radio-Frequency MicroElectroMechanical Systems (RF-MEMS).  Even though RF-MEMS have been used in the past to reconfigure filters, phase-shifters, capacitors and inductors, their integration in an antenna system has been limited as it faces a plethora of issues that need to be resolved.  The absence of a reconfigurable RF-MEMS antenna system and the recent advances in fractal - and especially Sierpinski gasket- antennas combined with the availability of series cantilever RF-MEMS switches, sparked the pioneering idea to design a multiple-frequency antenna that will radiate on-demand the same radiation pattern at various frequencies.  Such a system was designed and successfully implemented, as the first functional, fully integrated RF-MEMS reconfigurable self-similar antenna.

In this talk, several reconfigurable antennas are presented and discussed.  The antennas to be presented cover a wide range of designs such as fractal antennas, triangular antennas, dipoles and monopoles with variable sleeves.  All these antennas make use of MEMS, PIN switches, photoconductive switches or rotating feeds to make them reconfigurable. Some of the challenges that the designer has to face in biasing and integrating these switches with the antenna has are also presented and discussed.

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