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A novel defected ground structure to improve the output power of a VCO
Author(s) -
Liu H. W.,
Sun X. W.,
Cheng Z. Q.,
Li Z. F.
Publication year - 2003
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.11038
Subject(s) - voltage controlled oscillator , microstrip , microwave , electrical engineering , stopband , power (physics) , engineering , voltage , transistor , line (geometry) , electronic engineering , harmonic , topology (electrical circuits) , physics , telecommunications , acoustics , resonator , mathematics , geometry , quantum mechanics
In this paper, a novel defected ground structure (DGS), connected in parallel to two periodic structures with different center frequencies of the stopband, is proposed for increasing the output power of a voltage‐controlled oscillator (VCO) in microstrip circuits. To evaluate the effects of DGS on the output power, two GaAs field‐effect transistor (FET) VCOs have been designed and fabricated. One of them has a 50Ω microstrip line with DGS at the output section, while the other has only a 50Ω straight line. Measured results show that DGS rejects the second harmonic at the output and yields improved output power by 1–5%. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 279–281, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11038

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