Nonresonating Mode Waveguide Filters
Abstract — The multimode approach is a well-established technique for the design of microwave filters. The idea underlying a multimode cavity filter is that a single physical cavity can be designed so as to handle more than one resonant mode. In terms of filtering function this means that each cavity is able to generate multiple poles, thus decreasing the number of physical cavities which are necessary to implement a certain filter order. As a result, one of the most successful applications of this technique is the realization of reduced-size waveguide cavity filters for satellites.
Recently, the classic multimode concept has been extended to also involve a different type of modes, namely the nonresonating modes. What is meant by nonresonating mode? The term nonresonating indicates a mode that resonates far away from the filter passband. Such a mode can be propagating or evanescent at the operative frequencies, but not resonating. In this new multimode approach the nonresonating modes can be used in combination with either a single or a pair of resonant modes. The essential characteristic of the nonresonating modes is that they can be exploited to create additional paths for the electromagnetic energy flow that by-passes the resonant modes. By properly exploiting the interference between the different paths, pseudoelliptic filtering functions with finite frequency transmission zeroes can be obtained. In contrast with the classic multimode approach in which only resonant modes are employed, the selectivity provided by a single cavity is dramatically enhanced by generating transmission zeroes rather than by increasing the number of poles. Aside from the compactness, a major advantage of nonresonating mode filters is the possibility of generating a maximum number of transmission zeroes that equals the number of poles.
This talk will present an overview of the main contributions that recently introduced the use of nonresonating modes for the realization of pseudoelliptic waveguide filters. The attention will be especially focused on how the multimode operation in those structures can be easily related to well-known filter topologies, thus enabling the application of standard synthesis techniques as well as the understanding of otherwise rather complicated electromagnetic phenomena.
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- Dr. Ajay Kumar Poddar, Phone: (201)560-3806 (Email:akpoddar@ieee.org)
- Co-sponsored by MTT/AP-S, ED/CAS, TMC
- Starts 28 January 2014 03:00 PM UTC
- Ends 08 May 2014 02:00 PM UTC
- No Admission Charge
Speakers
Dr. Simone Bastioli of RS Microwave
Nonresonating Mode Waveguide Filters
This talk will present an overview of the main contributions that recently introduced the use of nonresonating modes for the realization of pseudoelliptic waveguide filters. The attention will be especially focused on how the multimode operation in those structures can be easily related to well-known filter topologies, thus enabling the application of standard synthesis techniques as well as the understanding of otherwise rather complicated electromagnetic phenomena.
Biography:
Simone Bastioli received the Master’s and Ph.D. degrees in Electronic Engineering from the University of Perugia, Italy, in 2006 and 2010, respectively.
In 2005, he was an intern at Ericsson AB, Mölndal, Sweden, working on waveguide filters and transitions for radiofrequency applications. In 2006, he was admitted as PhD student at University of Perugia with a scholarship funded by the Italian Space Agency (ASI). In 2009, he was with RF Microtech Srl, Perugia, Italy, where he was responsible for the design of advanced microwave filters for private and European Space Agency (ESA) funded projects. In 2010, he joined RS Microwave Company Inc., New Jersey, US, where he is currently employed as senior microwave research engineer working on reduced size multimode cavity filters, advanced high power evanescent-mode filters as well as dielectric resonator and lumped element filters for military applications.
Dr. Bastioli is a member of MTT-8 Filters and Passive Components Technical Committee, and he is an Associate Editor of the IEEE Microwave Magazine. He is also a member of the technical program committee for the IEEE MTT-S International Microwave Symposium (IMS). In 2012, he was the recipient of the IEEE Microwave Prize, which is is the oldest award granted by the Microwave Theory and Techniques Society, dating back to 1955. In 2008, he was awarded with the Best Student Paper Award at the IEEE MTT-S IMS held in Atlanta, GA, USA, and with the Young Engineers Prize at the European Microwave Conference held in Amsterdam, The Netherlands. In 2009, he was the recipient of the Hal Sobol Award presented at the IEEE MTT-S IMS held in Boston, MA, USA. His research activities resulted in more than thirty publications in international journals and conferences as well as five patent applications.
Email:
Address:RS Microwave, Butler, New Jersey, United States
Dr. Simone Bastioli of RS Microwave
Nonresonating Mode Waveguide Filters
Biography:
Email:
Address:New Jersey, United States
Dr. Simone Bastioli of RS Microwave
Nonresonating Mode Waveguide Filters
Biography:
Email:
Address:New Jersey, United States
Agenda
6:30-7:30 PM: Talk
Free dinner will be served at 6:00 PM. All are welcome. You don't have to be IEEE member to attend the talk.