| Abstract: | Impedance matching is a fundamental aspect of superconducting quantum device design, ensuring efficient signal transmission and minimizing reflection losses that could degrade qubit coherence and overall circuit performance. This thesis presents a fabrication methodology for developing impedance-controlled coplanar waveguide (CPW) transmission lines, enabling precise modulation of impedance through structural modifications. The proposed approach incorporates micro capacitive bridges into the CPW architecture, which increases the capacitance per unit length and thereby reduces the impedance relative to a standard CPW. The primary objective of this work is to systematically design, fabricate, and characterize these micro capacitive bridges, with a particular focus on accurately determining the capacitance of a single bridge. By obtaining this key parameter, one can engineer a smoothly tapered transmission line, leveraging capacitive bridges as a means of establishing a robust impedance matching network. This approach provides an adaptable and scalable method for optimizing impedance characteristics, offering potential benefits for superconducting quantum circuits, read-out resonators, and microwave device applications. Furthermore, this approach enables the development of more compact impedance-matched networks, addressing limitations present in conventional impedance-matching techniques. Most existing methods rely on geometric modifications of CPWs to achieve impedance control, often resulting in relatively large device footprints with restricted tunability. By leveraging micro capacitive bridges, this work introduces a more precise and scalable strategy for impedance engineering, allowing for enhanced control over transmission line properties while maintaining a compact architecture. |