Prof. Ferran Martin
Universitat Autònoma de Barcelona
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Academic Career Length
38Years (1989-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications18 April 2005 in IEEE Transactions on Microwave Theory and Techniques
Journal Article
JBJ.D. Baena
J.D. BaenaJBJ. Bonache
J. BonacheFerran MartinRSR.M. Sillero
R.M. Sillero
Francisco FalconeMSM. Sorolla
M. Sorolla
+5
In this paper, a new approach for the development of planar metamaterial structures is developed. For this purpose, split-ring resonators (SRRs) and complementary split-ring resonators (CSRRs) coupled to planar transmission lines are investigated. The electromagnetic behavior of these elements, as well as their coupling to the host transmission line, are studied, and analytical equivalent-circuit models are proposed for the isolated and coupled SRRs/CSRRs. From these models, the stopband/passband characteristics of the analyzed SRR/CSRR loaded transmission lines are derived. It is shown that, in the long wavelength limit, these stopbands/passbands can be interpreted as due to the presence of negative/positive values for the effective /spl epsiv/ and /spl mu/ of the line. The proposed analysis is of interest in the design of compact microwave devices based on the metamaterial concept.
1 November 2004 in Physical Review Letters
Journal Article
Francisco FalconeTLT. Lopetegi
T. LopetegiMLM. A. G. Laso
M. A. G. LasoJBJ. D. Baena
J. D. BaenaJBJ. Bonache
J. BonacheMSM. Sorolla
M. Sorolla
+3
The electromagnetic theory of diffraction and the Babinet principle are applied to the design of artificial metasurfaces and metamaterials. A new particle, the complementary split rings resonator, is proposed for the design of metasurfaces with high frequency selectivity and planar metamaterials with a negative dielectric permittivity. Applications in the fields of frequency selective surfaces and polarizers, as well as in microwave antennas and filter design, can be envisaged. The tunability of all these devices by an applied dc voltage is also achievable if these particles are etched on the appropriate substrate.
7 June 2004 in IEEE Microwave and Wireless Components Letters
Journal Article
Francisco FalconeTLT. Lopetegi
T. LopetegiJBJ.D. Baena
J.D. BaenaRMR. Marques
R. MarquesFerran MartinMSM. Sorolla
M. Sorolla
In this letter a super-compact stopband microstrip structure is proposed. The frequency gap is produced by an array of complementary split ring resonators (CSRRs)-a concept proposed here for the first time-etched on the ground plane. This behavior is interpreted as due to the presence of a negative effective dielectric permittivity in the vicinity of resonance. The resulting device produces a deep rejection frequency band with sharp cutoff, and a pass band that exhibits very low losses and good matching. Due to the sub-lambda operation of CSRRs, the electrical size of the device is very small.
31 August 2017 in IEEE Sensors Journal
Journal Article
Paris VelezLSLijuan Su
Lijuan SuKGKatia Grenier
Katia Grenier
JMJavier Mata-Contreras
Javier Mata-Contreras
DDDavid Dubuc
David Dubuc
Ferran MartinA microwave microfluidic sensor for dielectric characterization of liquids in real time is presented in this paper. The sensor is implemented in microstrip technology and consists of a symmetric splitter/combiner configuration loaded with a pair of identical split ring resonators (SRRs) and microfluidic channels placed on top of them (gap region). The sensor works in differential mode and sensing is based on frequency splitting. Thus, if the structure is unloaded or if it is symmetrically loaded with regard to the axial plane, only one transmission zero (notch) in the frequency response appears. However, if the axial symmetry is disrupted (e.g., by the presence of different liquids in the channels), two transmission zeros arise, and the difference in magnitude (notch depth) and frequency between such transmission zeros is indicative of the difference in the dielectric properties (complex dielectric constant). A circuit schematic, including transmission line sections to describe the distributed components, lumped elements to account for the SRRs and their coupling to the lines and lumped elements to model the liquid properties, is presented and validated. After proper calibration, the functionality of the proposed sensor is demonstrated by measuring the complex permittivity in solutions of deionized water and ethanol as a function of the ethanol content.
30 April 2007
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10 January 2006 in IEEE Transactions on Microwave Theory and Techniques
Journal Article
JBJ. Bonache
J. Bonache
Ignacio Gil GalíJGJ. Garcia-Garcia
J. Garcia-Garcia
Ferran MartinIn this paper, a new methodology for the design of compact planar filters in microstrip technology is proposed. This is based on cascading filter stages consisting of the combination of complementary split-ring resonators (CSRRs), recently proposed by the authors, series capacitive gaps, and grounded stubs. By this means, we achieve the necessary flexibility to simultaneously obtain quite symmetric frequency responses, controllable bandwidths, and compact dimensions. Two prototype device bandpass filters are provided to illustrate the potentiality of the proposed approach. In the first prototype, the structure is periodic (i.e., composed of identical cells) and behaves as a left-handed transmission line with controllable bandwidth. In the second prototype device, periodicity is sacrificed with an eye toward the synthesis of a standard (Chebyshev) approximation. The measured frequency responses point out low insertion losses in the passband, as well as high-frequency selectivity with small dimensions. As compared to conventional parallel coupled line filters, reduction of device length by a factor of 2.4 is demonstrated. This is the first time that planar filters with controllable bandwidth based on CSRRs are achieved. These structures can be of interest in those applications where miniaturization and compatibility with planar circuit technology are key issues
About Me
Ferran Martin (full professor) was born in Barakaldo, Vizcaya, Spain, in 1965. He received a B.S. degree in physics from the Universitat Autònoma de Barcelona (UAB) in 1988 and a Ph.D. degree in 1992. From 1994 to 2006, he was an Associate Professor of Electronics at the Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona. Since 2007, he has been a full professor of electronics. In recent years, he has been involved in different research activities including modeling and simulation of electron devices for high-frequency applications, millimeter wave and THz generation systems, and the application of electromagnetic bandgaps to microwave and millimeter wave circuits. He is very active in the field of metamaterials and their application to the miniaturization and optimization of microwave circuits and antennas. Other topics of interests include microwave sensors and RFID systems, with a special emphasis on the development of high-data-capacity chipless RFID tags. He is the head of the Microwave Engineering, Metamaterials, and Antennas Group (GEMMA Group) at UAB, and the Director of CIMITEC, a Research Center on Metamaterials supported by TECNIO (Generalitat de Catalunya). He is fellow of the IEEE and fellow of the IET. Among his distinctions, he has received the 2006 Duran Farell Prize for Technological Research, holds the Parc de Recerca UAB – Santander Technology Transfer Chair, and has been the recipient of three ICREA ACADEMIA Awards.