Loading...
Unified formulation for evaluation and visualization of electric and magnetic fields inside waveguides and cavity resonators
Hasan, Zahid
Hasan, Zahid
Citations
Altmetric:
Advisor
Editor
Date
Date Issued
2022
Date Submitted
Collections
Research Projects
Organizational Units
Journal Issue
Embargo Expires
Abstract
Waveguides and cavity resonators play an important role in microwave applications and optical systems. Applications include filters, antennas, and electromagnetic sources, such as magnetrons and lasers. They can also be used to enhance the sensitivity of sensors. Electromagnetic (EM) simulation helps optimize device configuration for better performance in the desired frequency band. With the aid of simulation software expensive reworks can be avoided. The computation and visualization of EM fields inside waveguides and cavity resonators is challenging even in simple rectangular cross sections. This problem becomes more complex when dealing with circular, sectoral, and coaxial geometries. The research presented in this thesis provides an efficient and cost-effective solution to these challenges; An interactive software (WGC version 3) that has been developed to enhance and expedite the design and testing process through the computation and visualization of the electric and magnetic field distribution inside waveguides and cavity resonators.
The software features a user-friendly interface through which users can select one of seven different configurations and specify parameters of their design, such as structure dimensions, Transverse Electric (TE) mode or Transverse Magnetic (TM) mode, mode number, operating frequency, number of points of any of the field components along the x, y, and z axis for rectangular structures, and any 2D plane angles between 0° to 360° for cylindrical structures. Both transverse and longitudinal field components can be visualized in vector, color contour or both. The software makes it easy for users to see how the changes of physical dimensions and operating frequency affect the field distribution. Moreover, the user interface allows users to select how visualizations of the field distribution are generated and displayed. Five selection options are made available: electric and magnetic field with vector; electric field vector; magnetic field vector; electric field strength; and magnetic field strength. Field distributions can be displayed as static images or video animations using appropriate sequencing of computed field values. The software provides all necessary warning messages to users for invalid input parameters.
The software has been designed in MATLAB App Designer platform. The executable code has been tested and verified on a personal computer (PC) platform running Windows 10 operating system. Mathematical expressions of the field components used in this software were derived from the classical solution of the wave equations using the separation of variables technique in cartesian coordinates for rectangular configurations and cylindrical coordinates for all other configurations. Results obtained using this software were validated against values found in the literature for similar types of problems, and results show perfect agreement.
The work developed in this thesis makes it possible for microwave engineers to quickly model and obtain information about the performance of their designs. It has great potential in enhancing the teaching and learning of microwave engineering. Visualizations produced by the software can greatly improve learners’ ability to understand how electromagnetic waves propagate through guided structures. Furthermore, it provides a cost-effective alternative to commercial software packages, such as Ansys High Frequency Structure Simulator (HFSS), and Computer Simulation Technology (CST) Studio Suite for such applications.
Associated Publications
Rights
Copyright of the original work is retained by the author.