PCB based Microwave Resonators and Filters

Abstract

Microwave circuits play an indispensable role in communication systems, radar tech- nologies, and an array of high-frequency applications, facilitating the transmission and pro- cessing of signals vital for modern society. However, the inherent presence of noise and ripples within these circuits poses formidable challenges, often compromising their per- formance. This thesis addresses this critical issue by proposing innovative solutions to enhance the functionality and precision of microwave circuits through the integration of balanced bridges. In pursuit of improved circuitry, this study focuses on the utilization of Microstrip and Coplanar Waveguide transmission lines, recognized for their versatility, ease of fabrication, and advantageous properties. The methodology employed in this thesis involves electro- magnetic simulation tools, notably Ansys Hfss, to optimize circuit parameters, ensuring optimal performance across a range of operating conditions. Furthermore, CAD software such as Eagle CAD is employed for circuit design, while PCB milling machines enable pre- cise fabrication to exacting specifications. Subsequent circuit measurements are conducted using a Vector Network Analyzer (VNA), facilitating comprehensive characterization and validation of circuit performance. By incorporating balanced bridges into microwave circuits and employing sophisticated simulation and fabrication methodologies, this research endeavors to mitigate noise and en- hance signal integrity during measurements, thereby increasing overall circuit performance. The findings of this study contribute to the advancement of microwave circuit design and measurement techniques, with potential applications in a wide range of high-frequency sys- tems.