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Synthesis and design of lossy filters

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Per teresa.san.jose Darrera modificació 24-11-2008 11:19

Speaker: Jordi Mateu, Ph.D. Affiliation: CTTC / UPC

Què Seminari
Quan 26-11-2008
de 10:00 a 10:45
On CTTC Room Auditorium
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SPEAKER: Jordi Mateu received the Telecommunication Engineering and Ph.D. degrees from the Universitat Politècnica de Catalunya (UPC), Barcelona, in 1999 and 2003, respectively. Since October 2006, he has been Research Fellow (Ramon y Cajal), with the Department of Signal Theory and Communications, UPC, and Associate Researcher at CTTC. From May to August 2001, he was Visiting Researcher with Superconductor Technologies Inc., Santa Barbara CA. From October 2002 to August 2005, he was research associate with CTTC, Spain. Since September 2004, he has held several guest researcher appointments at National Institute of Standards and Technology (NIST), Boulder, CO, where he was Fulbright Research Fellow from September 2005 to October 2006. In July 2006, he was visiting Researcher at Lincoln Lab., MIT. From September 2003 to August 2005, he was Part-time Assistant professor at Universitat Autònoma de Barcelona. In summer 1999, after graduation, he hold a trainee engineer position at Investment Technology department, Gillette, UK. He authored or co-authored over 30 papers in international journal, more than 40 contributions in international conferences, one book chapter and holds one patent on miniaturized resonators. His primary interest includes microwave devices and system and characterization and modeling of new electronic materials including ferroelectrics, magnetoelectric and superconductors. Dr. Mateu was the recipient of the 2004 Prize for the best doctoral thesis in Fundamental and Basic Technologies for Information and Communications by COIT (Colegio Oficial de Ingenieros de Telecomunicación) and AEIT (Asociación Española de Ingenieros de Telecomunicación). He was also the recipient of a Fulbright Research Fellowship, an Occasional Lecturer Award for visiting MIT and a Ramón y Cajal Contract.

ABSTRACT: Using classical synthesis techniques, the only way to achieve channelizer filters with high selectivity and  at passband response is through the use of resonators with high quality factor (Q). This might be unfeasible or impractical in space systems having stringent weight and volume restrictions. This research  evelops synthesis techniques that take into account the limited Q of the  filter resonators and optimize the  filter selectivity and passband flatness, at the expense of other  lter parameters (such as insertion loss) that are not critical in channelizer  filters. The benefit of such techniques is thus twofold: on one hand, they allow optimum channelizer filters for a given resonator technology; on the other, they allow to use compact, low Q technologies for some applications where only bulky, high Q resonators could be used if the  filter was designed using classical synthesis.This talk will include a recent developed unified mathematical description for the synthesis of lossy filter and will propose preliminar topologies for their implementation by means of using conventional and hyperbolic matrix rotation techniques.

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