Conduction noise absorption by ITO thin films attached to microstrip line utilizing Ohmic loss

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3456515· OSTI ID:21476362

Kim, Sun-Hong; Kim, Sung-Soo ^[1]

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1. Department of Advanced Materials Engineering, Chungbuk National University, Cheongju 361-763 (Korea, Republic of)

For the aim of wide-band noise absorbers with a special design for low frequency performance, this study proposes conductive indium-tin oxide (ITO) thin films as the absorbent materials in microstrip line. ITO thin films were deposited on the polyimide film substrates by rf magnetron cosputtering of In{sub 2}O{sub 3} and Sn targets. The deposited ITO films show a typical value of electrical resistivity ({approx}10{sup -4} {Omega} m) and sheet resistance can be controlled in the range of 20-230 {Omega} by variation in film thickness. Microstrip line with characteristic impedance of 50 {Omega} was used for determining their noise absorbing properties. It is found that there is an optimum sheet resistance of ITO films for the maximum power absorption. Reflection parameter (S{sub 11}) is increased with decrease in sheet resistance due to impedance mismatch. On the while, transmission parameter (S{sub 21}) is decreased with decrease in sheet resistance due to larger Ohmic loss of the ITO films. Experimental results and computational prediction show that the optimum sheet resistance is about 100 {Omega}. For this film, greater power absorption is predicted in the lower frequency region than ferrite thin films of high magnetic loss, which indicates that Ohmic loss is the predominant loss parameter for power absorption in the low frequency range.

• OSTI ID: 21476362
• Journal Information: Journal of Applied Physics, Vol. 108, Issue 2; Other Information: DOI: 10.1063/1.3456515; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
DEPOSITION
ELECTRIC CONDUCTIVITY
ENERGY ABSORPTION
ENERGY LOSSES
FREQUENCY DEPENDENCE
IMPEDANCE
INDIUM OXIDES
NOISE
ORGANIC POLYMERS
REFLECTION
SPUTTERING
SUBSTRATES
THIN FILMS
TIN OXIDES
CHALCOGENIDES
ELECTRICAL PROPERTIES
FILMS
INDIUM COMPOUNDS
LOSSES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
SORPTION
TIN COMPOUNDS