High-Frequency Noise Absorption of Ag-Fe3O4 Films on Microstrip Transmission Line

• Published in: IEEE transactions on magnetics Vol. 51; no. 4; pp. 1 - 4
• Main Authors: Chou, Yu-Jen, Chen, Lih-Shan, Houng, Mau-Phon
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Absorption; Diffraction; Magnetic films; Magnetic losses; Magnetism; Microstrip; Noise; Power transmission lines; Thin films; Ag–Fe3O4 films; electromagnetic interference (EMI); spin-coating technique; microstrip transmission line; noise absorption
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2014.2332973

This paper proposes Ag-Fe 3 O 4 films as a novel noise absorption material for the microstrip transmission line to replace current magnetic materials. The effect of the Ag-Fe 3 O 4 films on a microstrip transmission line for high-frequency noise absorption is discussed. Ag-Fe 3 O 4 films were prepared using the spin-coating technique and deposited on FR4 substrates. The film thickness was approximately 25-75 μm and sheet resistance was controlled in the range of 450-150 Ω. Crystal structures of Ag-Fe 3 O 4 films were conducted using the X-ray diffraction technique. The radio frequency properties of these films were measured using an Agilent Technologies E8364A vector network analyzer in the frequency range of 1-20 GHz. The experimental results show that the composite sheet in the broadband frequency region effectively absorbs the electromagnetic noise, exhibiting a power loss greater than 70% in the frequency range of 6-20 GHz.