Single Layer Wideband Electromagnetic Absorber

Date

2024-8

Author

Aslan, Ali Furkan

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This thesis presents design, analysis, and experimental validation of a single-layer wideband electromagnetic absorber in the frequency range of 3.5 - 5 GHz. Absorber is designed on a FR-4 substrate and has a low-profile. The absorber architecture comprises two integral components: an array antenna and a wideband lossy structure. The array antenna, which has a slot antenna as a unit cell, exhibits −10 dB reflection characteristics, covering the designated frequency band with a receiving capability of ±30◦ . Furthermore, for the design of the wideband lossy structure, a tailored adaptation of coupled filter theory is introduced to the realm of one-port lossy structure design. A concise explanation of the fundamentals of coupled filter theory is provided to clarify the design methodology. Using the coupled filter theory, wideband lossy structures are engineered on the FR-4 substrate to achieve a wideband lossy structure. As a proof of concept, a prototype absorber is fabricated and subjected to measurements in an anechoic chamber. Experimental validation covers several monostatic radar cross section measurements, conducted to demonstrate the absorber’s efficiency in attenuating incoming electromagnetic power across the designated frequency range.

Subject Keywords

Absorber, Coupled Filter Theory, Slot Antenna, RCS

URI

https://hdl.handle.net/11511/111548

Collections

Graduate School of Natural and Applied Sciences, Thesis