Automated cancellation of harmonics using feed-forward filter reflection for radar transmitter linearization

Kyle A. Gallagher; Gregory J. Mazzaro; Ram M. Narayanan; Kelly D. Sherbondy; Anthony F. Martone

doi:10.1117/12.2051431

29 May 2014 Automated cancellation of harmonics using feed-forward filter reflection for radar transmitter linearization

Kyle A. Gallagher, Gregory J. Mazzaro, Ram M. Narayanan, Kelly D. Sherbondy, Anthony F. Martone

Author Affiliations +

Proceedings Volume 9077, Radar Sensor Technology XVIII; 907703 (2014) https://doi.org/10.1117/12.2051431
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

Microwave power amplifiers often operate in the nonlinear region to maximize efficiency. However, such operation inevitably produces significant harmonics at the output, thereby degrading the performance of the microwave systems. An automated method for canceling harmonics generated by a power amplifier is presented in this paper. Automated tuning is demonstrated over 400 MHz of bandwidth with a minimum cancellation of 110 dB. The intended application for the harmonic cancellation is to create a linear radar transmitter for the remote detection of non-linear targets. The signal emitted from the non-linear targets is often very weak. High transmitter linearization is required to prevent the harmonics generated by the radar itself from masking this weak signal.

Citation Download Citation

Kyle A. Gallagher, Gregory J. Mazzaro, Ram M. Narayanan, Kelly D. Sherbondy, and Anthony F. Martone "Automated cancellation of harmonics using feed-forward filter reflection for radar transmitter linearization", Proc. SPIE 9077, Radar Sensor Technology XVIII, 907703 (29 May 2014); https://doi.org/10.1117/12.2051431

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