A &lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;${W}$ &lt;/tex-math&gt; &lt;/inline-formula&gt;-Band Backward-Wave Oscillator Based on Planar Helix Slow Wave Structure

M M Ajith Kumar,Shaomeng Wang,Sheel Aditya

doi:10.1109/ted.2018.2871785

A <inline-formula> <tex-math notation="LaTeX">${W}$ </tex-math> </inline-formula>-Band Backward-Wave Oscillator Based on Planar Helix Slow Wave Structure

M M Ajith Kumar, Shaomeng Wang + Show 1 more

Open Access

https://doi.org/10.1109/ted.2018.2871785

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Abstract

A backward-wave oscillator (BWO) operating at W-band is presented. The BWO is based on a microfabrication-compatible planar helix slow wave structure with straight-edge connections (PH-SECs). The oscillator is designed to operate with a beam current of 20 mA and a beam voltage varying from 7 kV to 11 kV. Dispersion characteristics and their sensitivity to some of the geometrical parameters are presented. The particle-in-cell simulation results show that the oscillator frequency tunes from 86.9 GHz to 100.07 GHz with a tunable bandwidth of 14%. The oscillator provides a maximum peak output power of 2.3 W and a peak efficiency of 1.62%. Results of oscillator performance with a beam current of 18 mA and 16 mA are also presented. To validate the simulation results of the PH-SEC, a scaled version of the PH-SEC operating at ${X}$ -band is fabricated. The measured S-parameters and the phase velocity for the fabricated structure match very well with the simulation results.

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