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High efficiency and suppression harmonics oscillator using front coupled tapered CMRC
Author(s) -
Hayati Mohsen,
Lotfi Ali
Publication year - 2012
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.26943
Subject(s) - harmonics , microstrip , transistor , microwave , fundamental frequency , harmonic , electrical engineering , oscillation (cell signaling) , port (circuit theory) , electronic engineering , physics , topology (electrical circuits) , engineering , acoustics , voltage , telecommunications , biology , genetics
This article presents a novel terminating network for microwave transistor oscillator.A front coupled tapered compact microstrip resonant cell (FCTCMRC) is inserted between the transistor and the input fundamental matching network as its terminating resonance. The fundamental frequency from the output can be connected in a positive feedback loop to the input port by tuning the dimensions of the proposed FCTCMRC. This feedback can simultaneously act as a negative feedback for the second harmonic frequency. The output at the fundamental frequency improved due to the second harmonic suppression. The proposed FCTCMRC is used to obtain as high a reflection coefficient as possible, while providing the oscillation condition with the incorporated microwave transistor. The measured results show 63.05% improvement suppression of the second harmonic using FCTCMRC in comparison with the conventional microstrip line. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1862–1866, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26943