A master’s thesis was discussed at the College of Electronics Engineering on Tuesday, April 29, 2026, by the student Maryam Basim Ayoub, titled “Investigation of Reconfigurable Frequency Selective Surfaces (FSS).”
The thesis involved a study of the technique of Reconfigurable Frequency Selective Surfaces (RFSS). The performance of frequency selective surfaces composed of one or two square rings printed on a dielectric substrate was analyzed using CST software. A PIN diode was used to close the open ring and convert it into a closed ring or leave it unchanged. In this way, the surface can be electronically tuned to change its frequency response from transmission to reflection or to switch between these states at the same frequency.
To simplify the electronic control circuit of the diode, a new design was proposed using a Light Dependent Resistor (LDR) to close the open ring upon light exposure. This approach simplifies the control circuitry and reduces implementation costs, as it eliminates the need for connecting wires and other electrical components typically used with the diode. This change influences the way the surface interacts with the incident electromagnetic wave.
It is worth mentioning that the results of this study led to two research papers. The first was published in a Scopus-indexed conference and in the IEEE Xplore database, while the second was presented at an international conference and is scheduled to be published by Springer.
The examination committee consisted of:
1. Asst. Prof. Dr. Ahmed Mohammed Salama / College of Electronics Engineering / University of Ninevah (Chairman)
2. Asst. Prof. Dr. Saad Wasmi Othman / College of Engineering / University of Mosul (Member)
3. Dr. Adham Moan Salih / College of Electronics Engineering / University of Ninevah (Member)
4. Prof. Dr. Khalil Hassan Sayyid Mar’i / Professor Emeritus / College of Electronics Engineering / University of Ninevah (Member and Supervisor)
