A rigorous yet computationally efficient 3-D numerical method has been proposed based on modified alternatingdirection-implicit finite-difference time-domain (ADI FDTD) methods. It has the capability of modeling the anisotropic and dispersive properties of magnetic material. The proposed algorithm solves Maxwell's equations and Landau-Lifshitz-Gilbert equation jointly and simultaneously, requiring only tridiagonal matrix inversion as in ADI FDTD. The accuracy of the modeling has been validated by: 1) the nonreciprocity of an X-band ferrite resonance isolator; 2) the attenuation constant of a magnetically tunable waveguide filter; and 3) the dispersive permeability of a 2-μm-thick magnetic thin film. Time steps that are up to 5000 times larger than the Courant-Friedrichs-Lewy limit have been used in these simulations without encountering stability issues. The simulation results agree with the predictions made from the theory, the commercial software or the experiments. Moreover, the algorithm has been applied to predict the effect of high permeability thin films in platform effect reduction. An electric current sheet close to a perfect electrically conducting plane coated with a 2-μm-thick magnetic thin film is simulated, which exhibits an enhanced surface resistance by three orders of magnitude higher than that without the magnetic thin film.

Zhi Yao

Rustu Umut Tok

Tatsuo Itoh

Yuanxun Ethan Wang

IEEE Transactions on Microwave Theory and Techniques

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNICALS 侧重于与微波/毫米波组件、设备、电路和系统相关的工程和理论部分，涉及微波信号的产生、调制、解调、控制、传输和检测。这包括科学、技术和工业活动。微波理论和技术涉及通常在几MHZ和THZ之间的频率范围内的电磁波；只要基本的微波理论和技术可以产生有用的结果，其他光谱区域和波类型都包括在该协会的范围内。通常，这发生在尺寸与波长相当的结构中的波传播理论中，以及用于分析和设计的相关技术中。

The IEEE Transactions on Microwave Theory and Techniques focuses on the engineering and theoretical aspects related to microwave and millimeter-wave components, devices, circuits, and systems. It encompasses the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technological, and industrial activities. Microwave theory and techniques primarily deal with electromagnetic waves in the frequency range of a few MHz to THz; as long as fundamental microwave theories and techniques yield useful results, other spectral regions and wave types are also included within the scope of this journal. Typically, this occurs in wave propagation theories within structures comparable in size to the wavelength, as well as in the relevant techniques used for analysis and design.

《IEEE Transactions on Microwave Theory and Techniques》专注于微波和毫米波组件、设备、电路及系统的工程与理论研究，涵盖微波信号的产生、调制、解调、控制、传输和检测等方面。这些研究涉及科学、技术和工业活动。微波理论和技术主要涉及频率范围在几MHz到THz之间的电磁波；只要基本的微波理论和技术能够产生有用的结果，其他频谱区域和波类型也在该期刊的范围之内。通常，这些研究涉及与波长相当的结构中的波传播理论，以及用于分析和设计的相关技术。

Category	Quartile
工程技术	1
工程技术, 工程电子与电气	2

A Multiscale Unconditionally Stable Time-Domain (MUST) Solver Unifying Electrodynamics and Micromagnetics

ivySCI AI Smartly Parses PDF, Answers Researchers' Questions, and Helps You Understand Papers in Seconds

Journal Info

Category	Quartile
ENGINEERING, ELECTRICAL & ELECTRONIC	2