The research on printed planar filters (fabricated using microstrip and/or coplanar waveguide technologies) has been, for many years, a very popular research topic. The reason is that these devices are essential for modern microwave and RF systems. Thus, any improvement of performance, functionality, size or cost, immediately benefits a lot of people involved in the development of RF/microwave communication systems. Some members of the Microwaves Group (University of Seville, Seville, Spain), have focused their research activities on this topic. The distinctive feature of their approach to planar filter design has been the use of the ground plane side of the metallized substrates to include suitable components providing some kind of improvement in the filter response (defected ground structures). The combination of microstrip and coplanar waveguide sections in the same filter is an example of this approach. The purpose of this talk is to provide an overview of the contributions of this research group to the design of printed filters along the last few years. This includes improved versions of coupled line filters, compact microstrip/CPW low-pass filters, new dual band filters, and balanced differential filters with strong common mode rejection.
Prof. Francisco Medina (Ph.D. in Physics 1987, Ass. Prof. Electromagnetism 1990, Prof. 2009, IEEE Fellow 2010) is the leader of the Microwaves Group at University of Seville since 1998. He has worked on computational electromagnetism, passive microwave printed devices/ antennas and modeling of extraordinary transmission and metamaterials. He has coauthored 113 journal papers (56 of them are IEEE Transactions), 4 book chapters, 4 patents and more than 230 conference contributions.