scholarly journals Magnetic Excitation Mode in Multiferroics Ba2CoGe2O7

hamon ◽  
2020 ◽  
Vol 30 (3) ◽  
pp. 149-153
Author(s):  
Minoru Soda
Keyword(s):  
Magnetic Excitation ◽  
Excitation Mode

Magnetic excitation mode splitting and finite size effects in Rb2MnCl4

1997 ◽  
Vol 241-243 ◽  
pp. 566-569 ◽  
Author(s):  
H Tietze-Jaensch ◽  
R van de Kamp ◽  
W Schmidt
Keyword(s):  
Size Effects ◽  
Finite Size ◽  
Magnetic Excitation ◽  
Finite Size Effects ◽  
Excitation Mode ◽  
Mode Splitting

scholarly journals Research on a Piezoelectric Energy Harvester with Rotating Magnetic Excitation

2021 ◽  
Author(s):  
Zhe Wang ◽  
Lipeng He ◽  
Zheng Zhang ◽  
Ziming Zhou ◽  
Jianwen Zhou ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Magnetic Excitation ◽  
Piezoelectric Energy

Study of gyrotron synchronization by an external harmonic signal based on a modified quasi-linear theory

2021 ◽  
Vol 29 (6) ◽  
pp. 905-914
Author(s):  
Nataliia Grigorieva ◽  
Keyword(s):  
Linear Model ◽  
Harmonic Signal ◽  
Rational Functions ◽  
Maximum Efficiency ◽  
External Signal ◽  
Excitation Mode ◽  
Microwave Electronics ◽  
Simulation Based ◽  
Hard Excitation ◽  
Synchronization Pattern

Topic. The paper is devoted to the study of synchronization of a gyrotron by an external harmonic signal. A theoretical study of gyrotron synchronization processes by means of a computational experiment based on certain traditional models of microwave electronics does not provide a complete description of the synchronization pattern. Therefore, the goal of the paper is to develop a modified quasi-linear model based on an approximation of the electron susceptibility by rational functions. Methods. The developed model allows for bifurcation analysis of synchronization processes. On its basis, stationary states are determined and their stability analysis is carried out. The results are in good agreement with numerical simulation based on the non-stationary theory of a gyrotron with a fixed Gaussian high-frequency field structure. Results and discussion. Resonance curves and synchronization bounds are built on the plane of parameters “amplitude – frequency of external signal”. The case where the gyrotron is in the hard excitation mode is considered, since the maximum efficiency is usually achieved in the hard excitation mode. In general, the results are in qualitative agreement with the picture described earlier for a simpler quasi-linear model of a oscillator with hard excitation, in the case of a sufficiently strong phase nonlinearity.

MODELING THE FREQUENCY CHARACTERISTICS OF THE QUADRATURE THREE-LOOP L-BAND WAVELENGTH BRIDGE

2021 ◽  
Author(s):  
Л.В. АЛЕКСЕЙЧИК ◽  
Н.В. АНДРИЕВСКИЙ
Keyword(s):  
Transmission Lines ◽  
Electric Circuit ◽  
Wave Resistance ◽  
Frequency Characteristics ◽  
Excitation Mode ◽  
S Matrix ◽  
Scattering Matrices ◽  
Standard Wave ◽  
Strip Lines ◽  
Algebraic Summation

Представлены результаты численного моделирования частотныххарактеристик квадратурного трехшлейфового моста (КШМ) L-диапазона, выполненного на основе симметричной полосковой линии с воздушным заполнением. Цель работы - установление допустимого уровня вносимых тепловых потерь полосковых линий (или других типов линий передачи), не оказывающих заметного влияния на рабочие характеристики КШМ, удовлетворяющие требуемым параметрам. Метод расчета основан на принципе декомпозиции электрической цепи КШМ на шесть симметричных 6-полюсников, три из которых соответствуют нечетной моде возбуждения КШМ, а три других - четной моде возбуждения КШМ. Алгебраическое суммирование матриц рассеяния указанных мод позволило получить частотные характеристики результирующей S-матрицы рассеяния КШМ. Нормирование S-матрицы к стандартному волновому сопротивлению 50 Ом выполнено с помощью вычисления собственных значений матриц рассеяния эквивалентных 4-полюсников КШМ. Моделирование проведено в среде LabVIEW. The paper presents the results of numerical simulation of the frequency characteristics of the L-range quadrature three-loop bridge (QLB), based on the symmetric striped line with air filling. The purpose of the study is to establish the permissible level of introduced thermal losses of strip lines (or other types of transmission lines) that do not significantly affect the performance characteristics of the QLB, satisfying the required parameters. The calculation method is based on the principle of decomposition of the QLB electric circuit into six symmetric 6-poles, three of which correspond to the odd excitation mode of the QLB, and the other three correspond to the even excitation mode of the QLB. Algebraic summation of the scattering matrices of these modes made it possible to obtain frequency characteristics of the resulting S-scattering matrix of the qLb. The normalization of the S-matrix to the standard wave resistance of 50 Ohms was carried out using the calculation of the eigenvalues of the scattering matrices of equivalent 4-poles of the QLB. The simulation was carried out in the LabVIEW environment.

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