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Design and Simulation of Microwave Filters Using Non-uniform Transmission Line and SuperformulaZhaoyang Li (8120606) 12 December 2019 (has links)
In this study, a novel and systematic methodology for the design and optimization of
lowpass filters (LPFs), and multiorder-bandpass filters (BPFs) are proposed. The width of the
LPF signal traces consistently follow Fourier truncated series, and the thickness of the substrate
as well. By studying different lengths and other physical constraints, the design meets predefined
electrical requirements. Moreover, superformula is used in split ring resonators (SRRs) designs
to obtain a BPF response and significant structural compactness.
Non-uniform transmission lines, as well as superformula equations, are programmed in
MATLAB, which is also used for analytical validations. Traces are drawn in AutoCAD. The
substrate of LPF is constructed in Pro/e. Finally, the optimized layouts are imported to Ansys
High Frequency Structure Simulation (HFSS) software for simulation and verification. Nonuniform LPFs are optimized over a range of 0-6 GHz with cutoff frequency 3.5 GHz.
Superformula implemented multiorder-BPFs are optimized with cutoff frequency of 1.1 GHz.
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