This talk will cover several research projects on advanced RF structures designed and built for various applications in accelerators and vacuum electronic devices, including:
- an X-band metamaterial structure for beam-driven wakefield acceleration tested at AWA;
- an S-band metamaterial-based backward wave oscillator built and tested at MIT;
- an S-band accelerator cavity designed and built for rapid proton beam energy modulation in cancer therapy at SLAC;
- an X-band klystrino design for a compact, cost-effective and high-efficiency microwave source at SLAC.
Emphasis will be placed on how the advanced RF designs helped to improve device performances in different applications.