IRIS Università Politecnica delle Marchehttps://iris.univpm.itIl sistema di repository digitale IRIS acquisisce, archivia, indicizza, conserva e rende accessibili prodotti digitali della ricerca.Sun, 13 Jun 2021 08:41:26 GMT2021-06-13T08:41:26Z10641CAD of multilayer conformal cylindrical arrayshttp://hdl.handle.net/11566/46512Titolo: CAD of multilayer conformal cylindrical arrays
Mon, 01 Jan 2001 00:00:00 GMThttp://hdl.handle.net/11566/465122001-01-01T00:00:00ZHomework Open-Source Platform (HOP) to test the students' knowledge in Electromagneticshttp://hdl.handle.net/11566/205325Titolo: Homework Open-Source Platform (HOP) to test the students' knowledge in Electromagnetics
Abstract: An Open-source platform for homework assignment and correction is presented and discussed. The platform was used during the academic course in Fundamentals of Electromagnetics at the Università Politecnica delle Marche, Ancona, Italy. Statistics on the marks obtained by the students showhed that the homework undoubtedly enhanced the students' knowledge.
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/11566/2053252014-01-01T00:00:00ZAn Equivalent Circuit for Discontinuities Exciting Evanescent Accessible Modeshttp://hdl.handle.net/11566/69636Titolo: An Equivalent Circuit for Discontinuities Exciting Evanescent Accessible Modes
Abstract: An equivalent circuit for discontinuities exciting evanescent accessible modes is proposed. The key feature of this equivalent circuit is its capability for simplification if a port relative to an accessible evanescent mode is matched, or connected to a very long line. Circuit drawing is simple, fast, and based on a regular polygon with as many susceptances as the sides and diagonals. Each side is connected with a line of electrical length θk to the terminal ports, and if the port refers to an evanescent accessible mode, a series reactance is added. This reactance is the key to the evanescent part of the circuit because it is able to cancel the effect of the evanescent mode if the relative port is matched or connected to a very long evanescent line, reducing the complexity of the circuit by one degree. With the help of the proposed equivalent circuit, we can define some approximating functions for the elements of a circuit representing a post in a waveguide, which can be used to speed up the optimization of complex structures, like filters or diplexers, based on posts.
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/11566/696362012-01-01T00:00:00ZVariational analysis of the dielectric rib waveguide using the concept of 'transition function' and including edge singularitieshttp://hdl.handle.net/11566/31224Titolo: Variational analysis of the dielectric rib waveguide using the concept of 'transition function' and including edge singularities
Tue, 01 Jan 1991 00:00:00 GMThttp://hdl.handle.net/11566/312241991-01-01T00:00:00ZRadiation modes and step discontinuities in dielectric rib waveguidehttp://hdl.handle.net/11566/31228Titolo: Radiation modes and step discontinuities in dielectric rib waveguide
Wed, 01 Jan 1992 00:00:00 GMThttp://hdl.handle.net/11566/312281992-01-01T00:00:00ZModal analysis of nonlinear propagation in dielectric slab waveguidehttp://hdl.handle.net/11566/31225Titolo: Modal analysis of nonlinear propagation in dielectric slab waveguide
Abstract: In this paper we present a study of nonlinear guided propagation based on the development of the actual electromagnetic field in terms of the modes of a linear dielectric guide. This approach permits in principle to consider propagation over finite legnths of waveguide of general nonuniform nonlinearity, wirh arbitrary excitation at a finite location and to retain the second derivative term that is neglected in the usual Schrodinger equation approximation to the wave equation.
Mon, 01 Jan 1996 00:00:00 GMThttp://hdl.handle.net/11566/312251996-01-01T00:00:00ZScattering matrices representing the transformations between modal bases in rectangular waveguidehttp://hdl.handle.net/11566/51305Titolo: Scattering matrices representing the transformations between modal bases in rectangular waveguide
Abstract: The excitation of hybrid modes by discontinuities in rectangular waveguide can often be decomposed into separate LSE/LSM or TE/TM mechanisms, so that each component can be analyzed with the most suitable modal base. Correct interfacing, however, is required. We report the scattering matrices representing all the possible transformations of modal bases in rectangular waveguide. Such matrices provide an useful tool to simulate complex circuits made up of components strongly interacting, without requiring the use of a common modal base for the characterization of each element. Since the transformation matrices can easily include pieces of transmission lines, their use does not require any additional computation effort
Mon, 01 Jan 2001 00:00:00 GMThttp://hdl.handle.net/11566/513052001-01-01T00:00:00ZAN EQUIVALENT CIRCUIT FOR MICROWAVE DISCONTINUITIEShttp://hdl.handle.net/11566/87421Titolo: AN EQUIVALENT CIRCUIT FOR MICROWAVE DISCONTINUITIES
Abstract: An equivalent circuit for discontinuities exciting evanescent accessible modes is proposed. The key feature of this equivalent circuit is its capability for simplification if a port relative to an accessible evanescent mode is matched, or connected to a very long line. Circuit drawing is simple and fast and is based on a regular polygon with as many susceptances as the sides and the diagonals. Each side is connected with a line of electrical length ￼ to the terminal ports and, if the port refers to an evanescent accessible mode, a series reactance is added. This reactance is the key to the evanescent part of the circuit because it is able to cancel the effect of the evanescent mode if the port is matched or connected to a very long evanescent line, reducing the complexity of the circuit by one degree.
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/11566/874212012-01-01T00:00:00ZNumerical modelling of diffraction by objects in GTEM cellhttp://hdl.handle.net/11566/46568Titolo: Numerical modelling of diffraction by objects in GTEM cell
Abstract: The GTEM (GigaTEM) cell is proving a useful tool for simulating free space scattering of objects under laboratory conditions. In this contribution, we present for the first time an efficient numerical algorithm for the characterization of the discontinuities presented by perfectly conducting cubic or spherical objects. Numerical results are compared with experimental data (provided by EMC Baden), showing very good agreement
Sat, 01 Jan 1994 00:00:00 GMThttp://hdl.handle.net/11566/465681994-01-01T00:00:00ZScattering Matrix of 2N-port hybrid directional couplershttp://hdl.handle.net/11566/262265Titolo: Scattering Matrix of 2N-port hybrid directional couplers
Abstract: The derivation of the scattering matrix of hybrid directional couplers with more than four ports is rather difficult to find in the literature. Some particular cases can be found, but a general form is not yet discussed. The aim of this contribution is to develop a simple procedure to write the 2NX2N S-matrix for hybrid directional couplers with N input and N output ports. This procedure is based on the separation of the phase of the scattering coefficients in two terms. The first is related to the presence of transmission lines, or phase shifters, connected to the coupler ports and the second to the intrinsic nature of the coupler that impose particular phase relationships to the scattering coefficients to ensure that the S-matrix is unitary. These relationships are due to the presence of one polyphase systems of order N or to m polyphase subsystems of order N/m, if N is multiple of m. Finally, it will be shown that 2N port hybrid directional couplers with phase shift equal to 0 or pi are possible only if N is an integer power of 2.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/11566/2622652018-01-01T00:00:00Z