A full-wave numerical approach for modal analysis of 1-D periodic microstrip structures

2006 ◽  
Vol 54 (4) ◽  
pp. 1350-1362 ◽  
Author(s):  
P. Baccarelli ◽  
C. Di Nallo ◽  
S. Paulotto ◽  
D.R. Jackson
Keyword(s):  
Modal Analysis ◽  
Numerical Approach ◽  
Full Wave

scholarly journals A theoretical and numerical approach for selecting miniaturized antenna topologies on magneto-dielectric substrates

2015 ◽  
Vol 7 (3-4) ◽  
pp. 369-377 ◽  
Author(s):  
Alex Pacini ◽  
Alessandra Costanzo ◽  
Diego Masotti
Keyword(s):  
Near Field ◽  
Dielectric Materials ◽  
Numerical Approach ◽  
Operating Conditions ◽  
Microwave Range ◽  
Dielectric Substrates ◽  
Full Wave ◽  
Miniaturized Antenna ◽  
Wavelength Radiation ◽  
Definition Of

An increasing interest is arising in developing miniaturized antennas in the microwave range. However, even when the adopted antennas dimensions are small compared with the wavelength, radiation performances have to be preserved to keep the system-operating conditions. For this purpose, magneto-dielectric materials are currently exploited as promising substrates, which allows us to reduce antenna dimensions by exploiting both relative permittivity and permeability. In this paper, we address generic antennas in resonant conditions and we develop a general theoretical approach, not based on simplified equivalent models, to establish topologies most suitable for exploiting high permeability and/or high-permittivity substrates, for miniaturization purposes. A novel definition of the region pertaining to the antenna near-field and of the associated field strength is proposed. It is then showed that radiation efficiency and bandwidth can be preserved only by a selected combinations of antenna topologies and substrate characteristics. Indeed, by the proposed independent approach, we confirm that non-dispersive magneto-dielectric materials with relative permeability greater than unit, can be efficiently adopted only by antennas that are mainly represented by equivalent magnetic sources. Conversely, if equivalent electric sources are involved, the antenna performances are significantly degraded. The theoretical results are validated by full-wave numerical simulations of reference topologies.

Full-wave modal analysis of NRD guide T-Junction

2000 ◽  
Vol 10 (6) ◽  
pp. 228-230 ◽  
Author(s):  
F. Boone ◽  
Ke Wu
Keyword(s):  
Modal Analysis ◽  
Full Wave ◽  
Nrd Guide

Efficient Full-wave Modal Analysis of Arbitrarily Shaped Waveguides using BI-RME and Nystr?m Methods

2003 ◽  
Author(s):  
Mariam Taroncher ◽  
Ana Vidal ◽  
Vicente E. Boria ◽  
Stephan Marini ◽  
Pablo Soto ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Full Wave

Full-wave modal analysis of the rectangular waveguide grating

2000 ◽  
Vol 28 (3) ◽  
pp. 614-620 ◽  
Author(s):  
T. Shiozawa ◽  
T. Ueda ◽  
A. Hirata ◽  
G.I. Zaginaylov
Keyword(s):  
Modal Analysis ◽  
Rectangular Waveguide ◽  
Waveguide Grating ◽  
Full Wave ◽  
Rectangular Waveguide Grating

Modal analysis of magnetic vibration of induction motor used in household appliances

2020 ◽  
pp. 1-16
Author(s):  
Pawel Witczak ◽  
Witold Kubiak ◽  
Jacek Szulakowski
Keyword(s):  
Finite Elements ◽  
Modal Analysis ◽  
Induction Motor ◽  
Numerical Approach ◽  
Combined Approach ◽  
Theoretical Investigations ◽  
Rigorous Description ◽  
Modal Description ◽  
Mechanical Phenomena ◽  
Rotor Axis

The paper deals with analysis of vibrational behavior of induction motor using the combined approach linking the finite elements method (FEM) applied to modelling of magnetic and mechanical phenomena in the motor with its modal description in spectral domain. Results of investigations presented in this paper proved that relatively small rotor axis misalignment against stator leads to visible vibration if forces resulted from this effect have frequency close to rotor bending resonance. Paper contains a rigorous description of all steps in analysis with a special attention paid to details of numerical approach both in FEM and in spectral consideration. Results of theoretical investigations were confirmed by measurements.

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