19 May 2006 Characterization of transmission lines at IR
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Abstract
We demonstrate the first long wave infrared (LWIR) transmission line design and characterization. Two of the widely used transmission-lines: coplanar striplines (CPS) and microstrip (MS) lines are characterized at IR frequency (28.3THz), in terms of transmission line parameters: characteristic impedance (Zo), attenuation constant (α) and effective index of refraction (neff), through modeling, fabrication and measurement. These transmission-line parameters cannot be directly measured, what can be measured is the antenna response. So we compute, measure and compare the response of the dipole antenna connected to these transmission lines as a function of transmission-line length. The response depends on the transformation of antenna impedance along the transmission-line length according to the transmission-line parameters (Zo, α and neff ) of the line. Comparison of measured and computed response validates extracted transmission-line parameters. This paper demonstrates excellent agreement between measured and computed response for both types of transmission-lines under study.
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T. A. Mandviwala, José Manuel López-Alonso, B. A. Lail, G. D. Boreman, "Characterization of transmission lines at IR", Proc. SPIE 6212, Terahertz for Military and Security Applications IV, 621212 (19 May 2006); doi: 10.1117/12.666066; https://doi.org/10.1117/12.666066
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