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2013-05-06
A Free-Space Method for Complex Permittivity Measurement of Bulk and Thin Film Dielectrics at Microwave Frequencies
By
Progress In Electromagnetics Research B, Vol. 51, 307-328, 2013
Abstract
A free-space, non-destructive method for measuring the complex permittivity of a double-layer bulk dielectrics and thin film oxide layers at microwave frequencies have been developed. The method utilizes a spot-focusing antenna system in conjunction with a vector network analyzer in the range of 18-26 GHz. The bulk dielectric was measured using the Transmission Method and Metal-Backed Method, while the Metal-Backed Method was used to investigate the thin films. Both types of samples were sandwiched between two quarter-wavelength Teflon plates to improve the mismatch at the frequencies of measurement. The thin film sample arrangement was backed by an additional metal plate. The double-layer bulk dielectric samples were Teflon-PVC and Plexiglas-PVC, while the thin film samples consisted of SiO2 layers of different thicknesses grown on doped and undoped Si wafer substrates. The relative permittivity obtained for PVC ranged between 2.62 to 2.93, while those for Plexiglas exhibited values between 2.45 to 2.63. The relative permittivity of SiO2 deposited on these wafers was between 3.5 to 4.5. All these values were in good agreement with published data The advantage of the method was its ability to measure the dielectric properties of the films at the mid-frequency band irrespective of the substrate type used. Simulations of the measurement setup were carried out using CST Microwave Studio and the simulation results agreed closely with the measurements.
Citation
Zaiki Awang Fatimah Audah Mohd Zaki Noor Hasimah Baba Ahmad Sabirin Zoolfakar Raudah Abu Bakar , "A Free-Space Method for Complex Permittivity Measurement of Bulk and Thin Film Dielectrics at Microwave Frequencies," Progress In Electromagnetics Research B, Vol. 51, 307-328, 2013.
doi:10.2528/PIERB13031509
http://www.jpier.org/PIERB/pier.php?paper=13031509
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