1,720,998 research outputs found
The open stop-band suppression in microstrip CRLH leaky-wave antennas: a full-wave modal characterization
No full textAbstrac
Efficient near-field interpolation of mixed-potential Green’s functions in layered media
No full textA higher order regularization of the multilayered
mixed-potential Green’s functions, based on enhanced effective-
media extractions, is presented. Singularities in the source
point, both of the Green’s function and of its derivatives up to
the second order, are fully removed. The regular kernel obtained
permits the effective implementation of near-field interpolation
schemes with application to the solution of electromagnetics
problems by the method of moments (MoM)
Utilizzo del metodo agli elementi finiti (FEM) per l’analisi di strutture a banda elettromagnetica proibita (EBG)
No full textUna tecnica di progetto di antenne a onda leaky stampate 1D periodiche con scansione continua del fascio attraverso il broadside
No full textRegolarizzazione e interpolazione delle funzioni di Green ai potenziali misti per l’analisi efficiente di strutture periodiche stampate su substrati dielettrici
No full textAnalysis and design of planar periodic leaky‐wave antennas
No full textThis chapter focuses on the general properties of planar periodic
leaky-wave antennas, and presents an accurate and versatile method for
analyzing this class of structures using the method of moments together with a
mixed-potential integral equation form of the electric field integral equation.
This type of antenna structure consists of a planar periodic metallization on a
grounded substrate, and is thus low in profile and simple to fabricate. Depending
on the frequency, radiation may occur in either the backward or the forward
directions. One important advantage of the proposed method of analysis is that it
allows for a complete characterization of the modal propagation on the structure,
including all possible propagation and radiation regimes
Matching techniques for efficient broadside radiation in 1-D periodic printed leaky-wave antennas
No full textSymmetric pi-matching networks are presented for suppressing the open stopband (OSB) and obtaining efficient broadside radiation in one-dimensional (1-D) periodic printed leaky-wave antennas (LWAs). The elimination of the OSB is achieved by matching the Bloch-wave impedance of the structure to a desired (non-zero) value at broadside frequency. Three different matching conditions can be applied. The effectiveness of the proposed techniques are demonstrated with numerical simulation on real structures
Trasmettitori ad alta efficienza in banda Ku basati su configurazioni ‘harmonic tuned’ e antenne integrate attive stampate
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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