KEYNOTE: Transmission Line Filters from Waveguides, to CPW, to Sound

Why do we still use transmission line theory in an age of high-powered simulation? Because the formalisms developed by pioneers like Levy, Cristal, Matthaei, Young, and Jones are remarkably elegant and universal. Whether you are working with microstrip, waveguides, CPW, or even acoustics, the same core principles apply. This talk explores how these “common threads” allow us to design sophisticated filters across different media without starting from scratch in a physics-based simulator every time. Transmission lines can be applied to any wave media that allows the impedance to be calculated as a function of some parameter. Typical microwave cases are waveguides, stripline, microstrip, and coplanar microwave, to name a few. The talk will consider two other wave systems: acoustic tube transmission lines, and water surface waves.