Design approach for compact rotary travelling-wave oscillator based on lumped phase shift networks

This paper introduces a design approach for Rotary Travelling-Wave Oscillator (RTWO) circuit utilizing lumped phase shift networks to enable compact implementation at low frequencies. In addition, the design trade-offs between the physical length, oscillation frequency, and bandwidth of the phase shift networks are studied. Using off-the-shelf components, a prototype RTWO circuit is designed, fabricated, and characterised at 150 MHz showing a successful proof-of-concept.