Mechanically-tunable composite filter at low frequencies

Sara Wheeland; Alireza V. Amirkhizi; Sia Nemat-Nasser

doi:10.1117/12.847695

30 March 2010 Mechanically-tunable composite filter at low frequencies

Sara Wheeland, Alireza V. Amirkhizi, Sia Nemat-Nasser

Proceedings Volume 7644, Behavior and Mechanics of Multifunctional Materials and Composites 2010; 76441N (2010) https://doi.org/10.1117/12.847695
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Previous studies into the possibility of a plasmonic medium of a coiled conductor array in air have shown promise. This work serves to evaluate the possibility of creating a mechanically-tunable composite filter at low frequencies. Copper springs were created with varying starting pitches using a coil winder. These springs were then embedded into a flexible host polymer. The mechanical and electromagnetic properties of each spring design were predicted and tested. Two horn antennas were used to characterize the overall electromagnetic (EM) properties of the composite. The pitch of each spring was increased mechanically through application of force to the entire polymermetal composite at equal intervals, with an EM test completed at each step. Using an Agilent 8510C Vector Network Analyzer (VNA), the frequency spectrum within the microwave range was scanned. Relative amplitude and phase measurements were taken at equal frequency and pitch steps. With no polymer surrounding the springs, plasmon turn-on frequencies were observed to span the microwave bands as the pitch of the springs were increased. Similar results are expected with the springs embedded in a polymeric matrix. These results suggest a method of creating a mechanically-tunable composite filter for use at low frequencies.

Citation Download Citation

Sara Wheeland, Alireza V. Amirkhizi, and Sia Nemat-Nasser "Mechanically-tunable composite filter at low frequencies", Proc. SPIE 7644, Behavior and Mechanics of Multifunctional Materials and Composites 2010, 76441N (30 March 2010); https://doi.org/10.1117/12.847695

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