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Numerical Modeling and Computation of Radio Frequency Devices

Lu, Jiaqing
http://rave.ohiolink.edu/etdc/view?acc_num=osu1543457620064355

Abstract Details

2018, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
The numerical simulation of radio frequency devices is addressed in this dissertation, including the methods in frequency domain and time domain. In frequency domain, an embedded domain decomposition method (DDM) is presented herein for solving electromagnetic (EM) problems with complex geometries. In the method, the original computational domain is decomposed into a background subdomain and multiple embedded subdomains. The subdomain problems are easier to solve than the original problem. Furthermore, the shapes of the subdomains can be geometrically non-conformal, and the discretizations in the subdomains are allowed to be completely independent. Information exchange between the subdomains are addressed with respect to four ingredients: field continuity, material difference, perfect electrical conductor (PEC), and port. Field continuity on the subdomain boundaries is weakly enforced by employing Robin transmission condition. Modified volume sources are introduced to account for the material difference between the subdomains. For PEC and port, surface currents on them in the embedded subdomains are impressed into the background subdomain in a proper way. The numerical properties of the proposed DDM, such as accuracy and convergence, are well demonstrated through several examples. Furthermore, we illustrate its usefulness and flexibility via several engineering problems of practical interest, including the applications in electromagnetic compatibility (EMC), antenna design, and integrated circuit (IC) analysis. With the benefits of embedded meshes, the modification of one subdomain will hardly affect the discretization and matrix computation of another subdomain. As a consequence, the introduced method offers a high degree of flexibility in modeling and simulation, and facilitates moving/replacing/adding objects in a background problem straightforwardly. Such feature and flexibility would be desirable in practical and industrial applications, especially for situations where a variety of multiscale components need to be analyzed or optimized. In time domain, we develop an approach to integrate the discontinuous Galerkin time-domain method (DGTD) with nonlinear circuit simulation. The simulation problem of mixed EM structure and circuit devices is decomposed into an EM subsystem and a circuit subsystem. The EM part is solved with the interior penalty DGTD approach, while simulation program with integrated circuit emphasis (SPICE) and input/output buffer information specification (IBIS) models are investigated for circuit simulation. The two subsystems are coupled through circuit ports based on the concept of impedance surface. A self-consistent scheme is proposed to establish the coupling within a convergent looping form. Finally, the accuracy and robustness of the developed program are demonstrated through the treatments of practical electronic systems with SPICE and IBIS circuits.
Jin-Fa Lee (Advisor)
Robert Lee (Committee Member)
Kubilay Sertel (Committee Member)
135 p.
Electrical Engineering; Electromagnetics
computational electromagnetics; finite element method; domain decomposition method; embedded meshes; discontinuous Galerkin method; electromagnetic-circuit co-simulation

Recommended Citations

Citations

  • Lu, J. (2018). Numerical Modeling and Computation of Radio Frequency Devices [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543457620064355

    APA Style (7th edition)

  • Lu, Jiaqing. Numerical Modeling and Computation of Radio Frequency Devices. 2018. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1543457620064355.

    MLA Style (8th edition)

  • Lu, Jiaqing. "Numerical Modeling and Computation of Radio Frequency Devices." Doctoral dissertation, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543457620064355

    Chicago Manual of Style (17th edition)

osu1543457620064355
496
© 2018, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.