Please use this identifier to cite or link to this item:
Title: Small-signal field analysis of GYRO-TWT amplifier
Researcher: Jasmine Saini
Guide(s): N. Kalyanasundaram and Krishna Gopal
Keywords: Field Analysis
Small signal
TWT Amplifier
Upload Date: 3-Jul-2015
University: Jaypee Institute of Information Technology
Completed Date: 28/03/2014
Abstract: A kinetic–theory based method of analyzing the small–signal amplification of TE and TM mode interaction of a circular cylindrical waveguide linearly interacting with an annular beam of gyrating electrons in a gyro-TWT configuration is presented in the thesis. Making use of the linearized Vlasov equation satisfied by the perturbed electron phase space density, the perturbed propagation phase constant is shown to satisfy a biquadratic algebraic equation when the cyclotron resonance condition is assumed to hold at the operating frequency. The biquadratic equation has always a pair of real roots and a second pair of complex conjugate roots. The complex root with positive imaginary part gives rise to a wave solution growing exponentially with propagation distance. With the cyclotron-resonance condition enforced over the entire frequency range by allowing the gyro-radius and the relativistic factor to be frequency-dependent, the variation of initial growth rate exhibit a sharp but large maximum in the case of TE mode interaction. However, in case of TM mode interaction, the initial growth rate of the interacting TM wave is seen to exhibit two maxima on either side of the minimum, a sharp but large maximum to the left and a broad but a smaller maximum to the right. However, it is impractical to allow any such variation of the gyro-TWT parameters with respect to the operating frequency in an amplifier. Thus, it is mandatory to keep the values of the relativistic factor and the normalized gyro-radius invariant with respect to frequency. On fixing the amplifier parameters, the growth-rate curve in case of TE mode interaction no longer exhibits a peak around the design frequency but rather a montonic variation with respect to frequency leading to severe frequency distortion of any signal with a frequency band centered around the design frequency. However, a gyro-TWT amplifier optimally designed for interaction with a TM mode of a circular cylindrical waveguide is shown to be capable of decent small-signal gain over a broad band of frequencies around the design frequency
Appears in Departments:Department of Electronics and Communication Engineering

Files in This Item:
File Description SizeFormat 
01_title.pdfAttached File253.87 kBAdobe PDFView/Open
02_table of contents.pdf510.5 kBAdobe PDFView/Open
03_declaration & certificate.pdf177.61 kBAdobe PDFView/Open
04_preface.pdf240.52 kBAdobe PDFView/Open
05_acknowledgement.pdf173 kBAdobe PDFView/Open
06_abstract.pdf164.01 kBAdobe PDFView/Open
07_list of acronyms & abbrevations.pdf169.37 kBAdobe PDFView/Open
08_list of symbols.pdf334.62 kBAdobe PDFView/Open
09_list of figures & tables.pdf438.39 kBAdobe PDFView/Open
10_chapter1.pdf631.27 kBAdobe PDFView/Open
11_chapter2.pdf800.45 kBAdobe PDFView/Open
12_chapter3.pdf396.69 kBAdobe PDFView/Open
13_chapter4.pdf791.66 kBAdobe PDFView/Open
14_chapter5.pdf1.13 MBAdobe PDFView/Open
15_chapter6.pdf915.44 kBAdobe PDFView/Open
16_chapter7.pdf687.62 kBAdobe PDFView/Open
17_chapter8.pdf336.79 kBAdobe PDFView/Open
18_references.pdf585.01 kBAdobe PDFView/Open
19_list of publications.pdf223.02 kBAdobe PDFView/Open
20_synopsis.pdf569.17 kBAdobe PDFView/Open
Show full item record

Items in Shodhganga are licensed under Creative Commons Licence Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).

Altmetric Badge: