Prof. Giuliano Manara

Dipartimento di Ingegneria dell'Informazione, Università di Pisa, Italy

Prof. Giuliano Manara

Dipartimento di Ingegneria dell'Informazione, Università di Pisa, Italy

Co-authors

Following

Followers

Research Focus & Metrics

Explore full metrics on Scilit

Academic Career Length

45Years (1982-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications

1 March 2010 in IEEE Transactions on Antennas and Propagation

Journal Article

Analysis and Design of Ultra Thin Electromagnetic Absorbers Comprising Resistively Loaded High Impedance Surfaces

Filippo Costa

Agostino Monorchio

Giuliano Manara

High-impedance surfaces (HIS) comprising lossy frequency selective surfaces (FSS) are employed to design thin electromagnetic absorbers. The structure, despite its typical resonant behavior, is able to perform a very wideband absorption in a reduced thickness. Losses in the frequency selective surface are introduced by printing the periodic pattern through resistive inks and hence avoiding the typical soldering of a large number of lumped resistors. The effect of the surface resistance of the FSS and dielectric substrate characteristics on the input impedance of the absorber is discussed by means of a circuital model. It is shown that the optimum value of surface resistance is affected both by substrate parameters (thickness and permittivity) and by FSS element shape. The equivalent circuit model is then used to introduce the working principles of the narrowband and the wideband absorbing structure and to derive the best-suited element for wideband absorption.

21 September 2012 in IEEE Antennas and Propagation Magazine

Journal Article

Efficient Analysis of Frequency-Selective Surfaces by a Simple Equivalent-Circuit Model

Filippo Costa

Agostino Monorchio

Giuliano Manara

The transmission and reflection properties of frequency-selective surfaces (FSSs) are evaluated through a simple and accurate first-order circuit approach. The approximate analysis, based on the parallel between real structure and a lumped-LC-network counterpart, is also useful for acquiring physical insights into the working principles of frequency-selective surfaces. The first part of the paper describes a technique for computing lumped parameters of the most common frequency-selective-surface elements. The L and C parameters representing a given frequency-selective-surface element are derived only one time, at normal incidence, and stored, so as to form a database. The second part of the paper deals with the derivation of simple relations allowing the generalization of the stored LC couples in the case where the frequency-selective surface is printed or embedded in arbitrarily thick dielectric slabs, when the incident angle is varied from normal incidence, or if a different periodicity with respect to the reference periodicity is adopted. The generalized lumped parameters are included in an equivalent transmission line for computing the response of generic frequency-selective-surface configurations with no additional computational effort. The results obtained through the simplified model presented here are verified by a careful comparison with MoM simulations.

16 November 2012 in IEEE Transactions on Antennas and Propagation

Journal Article

A Circuit-Based Model for the Interpretation of Perfect Metamaterial Absorbers

A popular absorbing structure, often referred to as Perfect Metamaterial Absorber, comprising metallic periodic pattern over a thin low-loss grounded substrate is studied by resorting to an efficient transmission line model. This approach allows the derivation of simple and reliable closed formulas describing the absorption mechanism of the subwavelength structure. The analytic form of the real part of the input impedance is explicitly derived in order to explain why moderate losses of the substrate is sufficient to achieve matching with free space, that is, perfect absorption. The effect of the constituent parameters for tuning the working frequency and tailoring the absorption bandwidth is addressed. It is also shown that the choice of highly capacitive coupled elements allows obtaining the largest possible bandwidth whereas a highly frequency selective design is achieved with low capacitive elements like a cross array. Finally, the angular stability of the absorbing structure is investigated.

30 April 2021 in Sensors

Journal Article

A Review of RFID Sensors, the New Frontier of Internet of Things

Francesco Alessio Dicandia

Giuliano Manara

A review of technological solutions for RFID sensing and their current or envisioned applications is presented. The fundamentals of the wireless sensing technology are summarized in the first part of the work, and the benefits of adopting RFID sensors for replacing standard sensor-equipped Wi-Fi nodes are discussed. Emphasis is put on the absence of batteries and the lower cost of RFID sensors with respect to other sensor solutions available on the market. RFID sensors are critically compared by separating them into chipped and chipless configurations. Both categories are further analyzed with reference to their working mechanism (electronic, electromagnetic, and acoustic). RFID sensing through chip-equipped tags is now a mature technological solution, which is continuously increasing its presence on the market and in several applicative scenarios. On the other hand, chipless RFID sensing represents a relatively new concept, which could become a disruptive solution in the market, but further research in this field is necessary for customizing its employment in specific scenarios. The benefits and limitations of several tag configurations are shown and discussed. A summary of the most suitable applicative scenarios for RFID sensors are finally illustrated. Finally, a look at some sensing solutions available on the market are described and compared.

1 March 2010 in IEEE Transactions on Antennas and Propagation

Journal Article

A Focused Planar Microstrip Array for 2.4 GHz RFID Readers

A A Serra

The specific problems encountered in the design of near-field focused planar microstrip arrays for RFID (Radio Frequency IDentification) readers are described. In particular, the paper analyzes the case of a prototype operating at 2.4 GHz, which has been designed and characterized. Improvements with respect to conventional far-field focused arrays (equal phase arrays) are discussed and quantified.

1 June 2012 in IEEE Antennas and Propagation Magazine

Journal Article

Design Criteria for Near-Field-Focused Planar Arrays

Alice Buffi

Paolo Nepa

Giuliano Manara

A detailed performance analysis of near-field-focused planar arrays is addressed. Design curves and performance data are shown for planar square arrays as a function of the array size, the inter-element distance, and the focal distance. The performance curves are compared with results presented in earlier studies relevant to continuous-aperture antennas, as well as with numerical results obtained from a full-wave analysis of planar microstrip arrays.

About Me

Prof. Giuliano Manara is currently a professor with the Dipartimento di Ingegneria dell’Informazione, University of Pisa, Pisa, Italy. Since 1980, he has been collaborating with the Department of Electrical Engineering, Ohio State University, Columbus, OH, USA, where he was involved in research with the ElectroScience Laboratory, Columbus, in 1987. His contributions include uniform geometrical theory of diffraction and its applications. His research interests include the asymptotic solution of radiation and scattering problems to improve and extend the uniform geometrical theory of diffraction. He has also been engaged in research on numerical, analytical, and hybrid techniques (frequency and time domains); scattering from rough surfaces; frequency-selective surfaces; and electromagnetic compatibility. More recently, his research has also been focused on the design of microwave antennas with application to broadband wireless networks, on the development and testing of new microwave materials (metamaterials), and the analysis of antennas and propagation problems for radio frequency identification systems. Prof. Manara was elected the Vice Chair of the International Commission B “Fields and Waves” of URSI (International Radio Science Union) in August 2008. He served as the International Chair for URSI Commission B for the triennium from 2011 to 2014. He was elected a URSI Fellow in 2017. Since 2021, he has been serving as the Vice President for URSI.

Prof. Giuliano Manara

Prof. Giuliano Manara

Research Focus & Metrics

Academic Career Length

Publication Type Breakdown

Representative Publications

About Me