Third-Order Intermodulation Reduction by Harmonic Injection in a TWT Amplifier

@inproceedings{Wirth2001ThirdOrderIR,
  title={Third-Order Intermodulation Reduction by Harmonic Injection in a TWT Amplifier},
  author={Michael Wirth and Aarti Singh and John E. Scharer and John H. Booske},
  year={2001}
}
A method for reducing the two-tone third-order intermodulation products arising from two carrier frequencies at 1.95 and 2.00 GHz is demonstrated in a traveling wave tube-distributed amplifier. The optimum amplitude and phase of an injected second harmonic and the resulting intermodulation suppression of up to 24.2 dB are examined for fundamental drive levels approaching saturation. 
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On the physics of harmonic injection in a traveling wave tube

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IEEE Trans. Electron Devices , vol. 48, pp. 62–67, Jan. 2001. • 2001
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Improvement of third-order intermodulation product of RF and microwave amplifiers by injection

C. S. Aitchison, M. Mbabele, M. R. Moazzam, D. Budimir, F. Ali
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