Intermodulation suppression in a broad band TWT

Author

Singh, A. ; Scharer, J. ; Wirth, M. ; Bhattacharjee, S. ; Booske, J.

Author_Institution

Wisconsin Univ., Madison, WI, USA

fYear

2002

fDate

2002

Firstpage

284

Lastpage

285

Abstract

We examine methods for reducing two-tone intermodulation products in the custom-made XWING broadband traveling wave tube. Harmonic suppression, and difference frequency techniques are used to demonstrate intermodulation suppression and the spatial variation of their spectral evolution. Harmonic and difference frequency optimum drive levels and phase are determined which suppress the third-order intermodulation product by more than 21 dB in the 2-6 GHz band. The variation of the suppression with drive level near saturation and two-tone difference frequency are examined. IM3 reduction using the harmonic injection technique is experimentally demonstrated in a broadband TWT distributed amplifier.

Keywords

UHF amplifiers; distributed amplifiers; harmonic generation; intermodulation distortion; microwave amplifiers; travelling wave amplifiers; wideband amplifiers; 2 to 6 GHz; 20 to 30 dB; IM3 reduction; XWING traveling wave tube; broadband TWT amplifier; difference frequency techniques; distributed amplifier; frequency doubler technique; fundamental drive tones; harmonic injection; harmonic suppression; intermodulation suppression; two-stage helical TWT; two-tone intermodulation products; Distributed amplifiers; Frequency synthesizers; Gain; Harmonics suppression; Manufacturing; Microwave devices; Microwave theory and techniques; Phase measurement; Phase shifters; Radiofrequency amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International

Print_ISBN

0-7803-7256-5

Type

conf

DOI

10.1109/IVELEC.2002.999381

Filename

999381