ELT-47426 Transmission Lines and Waveguides, 5 cr
Additional information
Transmission line analysis can be understood as an extension to the elementary circuit analysis or as a special case of the waveguide analysis. The course focuses on the latter and aims to build understanding that is needed to analyze properties of waveguides and cavities (TE- and TM-modes) in addition to transmission lines (quasi-TEM mode). Such knowledge is needed, for example, in many applications in RF engineering: directional couplers, waveguide filters, microstrip antennas, and dielectric resonator antennas.
The course begins with review of TEM waves and continues with analysis of static electric and magnetic 2D problems that are encountered in defining the transmission line parameters. Simulation tools and laboratory work supplements the analytical work.
Person responsible
Jari Kangas, Mikko Valkama
Lessons
| Implementation | Period | Person responsible | Requirements |
| ELT-47426 2018-01 | 3 |
Jari Kangas |
Exam and two assignments. Exam is preferably taken by completing a set of tasks. |
Learning Outcomes
Upon completion of the course, * student is able to explain key features and limitations of the lumped circuit analysis, transmission lines, waveguides, and metallic cavities. * student is able to analyze signal propagation in transmission lines and waveguides and determine key parameters of such structures. * student has skills to use numerical design methods and tools to design and model transmission lines, waveguides, and cavities. * student is able intepret results of numerical simulations to reason properties of transmission lines, waveguides, and cavities. * student knows about practices in preparing technical reports and in giving peer feedback and is able to prepare a report that combines analytical, measured, and simulated estimates.
Content
| Content | Core content | Complementary knowledge | Specialist knowledge |
| 1. | Review of plane waves and propagation of TEM waves. Review of interface conditions on material interfaces (esp. ideal dielectric and ideal conductor). | ||
| 2. | Analysis of ideal and non-ideal transmission lines. Derivation of the Telegrapher equations starting from EM laws. Review of static EM problems to find the transmission line parameters. Use of simulation tools (Comsol) to find the transmission line parameters. Basics of use of EM field simulators. | Quasi-TEM waves, analysis of partially filled parallel-plate line. | |
| 3. | Rectangular waveguides, analysis of TE and TM waves in waveguides. Key parameters of rectangular waveguides. | Cylindrical and coaxial waveguides.Dielectric waveguides. Alternatives to tune waveguides. Hybrid modes in waveguides. | |
| 4. | Cavity resonators. Analysis of losses and quality factor. | Orthogonality of eigenmodes, excitation of a cavity. | |
| 5. | Modeling assignment, use of numerical design methods and tools to determine and compare properties of a transmission line, modified waveguide structure, or modified cavity resonator. | Implementation of simulation algorithms, FDTD and FIT algorithms. | |
| 6. | Laboratory work and experiments with basic transmission lines (coaxial cable, microstrip) and waveguides/cavities (e.g. excitation and quality factor of a cavity resonator). |
Study material
| Type | Name | Author | ISBN | URL | Additional information | Examination material |
| Book | Microwave Engineering | David M. Pozar | ISBN-10: 0471448788 (3rd) | 2nd, 3rd or 4th edition. | No |
Prerequisites
| Course | Mandatory/Advisable | Description |
| ELT-41736 Analysis of Electromagnetic Systems | Advisable | 1 |
1 . DEE-12001 Sähkömagnetiikka
Correspondence of content
| Course | Corresponds course | Description |
| ELT-47426 Transmission Lines and Waveguides, 5 cr | SMG-8307 Transmission Lines and Waveguides, 5 cr |