Design of a rectangular waveguide connected biosensor for frequencies from 220 to 1100 GHz

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Biomolecules have vibrational and rotational resonances at THz frequencies (0.1 to 10 THz) due to their structure and size. This unique interaction between electromagnetic waves in the THz frequency region and biological matter promises a multitude of applications of terahertz technology in life sciences, further enabled by the latest development of sources and detectors at this frequency range. Due to the emerging status of this new research field, there are many challenges to overcome when applying THz reflection and transmission measurements in biological samples. One of the challenges is the robustness and repeatability of the measurements. In this work, a biosensor design based on a transition between a rectangular waveguide (WR3, WR2, WR1.5 and WR1) and a Planar Goubau line (PGL) is presented for four different frequency ranges, from 220 GHz to 1.1 THz. With the proposed design, we leave probes and positioners aside, connecting the rectangular waveguides directly to the VNA and alleviating the uncertainty problems of on-probe measurements.
En este Proyecto Fin de Carrera, realizado en Chalmers University of Technology, se ha diseñado un sensor basado en una transición entre una guía de onda rectangular (WR-03, WR-02, WR-1.5 y WR-01) y un Planar Goubau Line (PGL). El diseño se ha realizado para cuatro diferentes rangos de frecuencias cubriendo desde 220 GHz hasta 1.1 THz. Utilizando como software de diseño CST. El objetivo de este trabajo es evitar el uso de sondas y posicionadores, conectando así las guías de onda rectangulares directamente al VNA (Analizador Vectorial de Redes), aliviando los problemas de incertidumbre causados por dichas sondas.
Terahertz technology, Electromagnetic devices, Rectangular waveguides, Waveguide transition, Substrate integrated waveguides
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