High efficiency and suppression harmonics oscillator using front coupled tapered CMRC

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

[1]  Songcheol Hong,et al.  Ku-band InGaP-GaAs HBT MMIC VCOs with balanced and differential topologies , 2004 .

[2]  K. Yoon,et al.  A new K‐band push‐push VCO using a miniaturized hairpin resonator , 2010 .

[3]  Quan Xue,et al.  Novel oscillator incorporating a compact microstrip resonant cell , 2001 .

[4]  Yong Liu,et al.  Investigation of SIW‐based planar integrated w‐band low‐phase noise Gunn harmonic oscillator , 2011 .

[5]  Eun Soo Nam,et al.  Characteristics of a 60 GHz MMIC mixer with an open stub microstrip line , 2010 .

[6]  Mohsen Hayati,et al.  Compact lowpass filter with high and wide rejection in stopband using front coupled tapered CMRC , 2010 .

[7]  Noh Hoon Myung,et al.  Novel oscillator incorporating a compact tunable resonant cell with high efficiency and superior harmonic characteristics , 2006 .

[8]  Hyun-Wook Lee,et al.  Design of an I-band low phase noise oscillator using a new hair-pin resonator , 2008, 2008 European Conference on Wireless Technology.

[9]  Nam-Young Kim,et al.  Low-phase noise oscillator using spurline resonator for I-band applications , 2011 .

[10]  Z. Tang,et al.  Low phase‐noise planar oscillators using high‐Q SIW bandpass filter , 2011 .

[11]  T.Y. Yum,et al.  Amplifier linearization using compact microstrip resonant cell-theory and experiment , 2004, IEEE Transactions on Microwave Theory and Techniques.

[12]  Dong-Hyo Lee,et al.  An X‐band microstrip oscillator integrated with frequency‐selecting patch antenna , 2009 .

[14]  Quan Xue,et al.  Low conversion-loss fourth subharmonic mixers incorporating CMRC for millimeter-wave applications , 2003 .

[15]  Sung-Jin Cho,et al.  A novel spiral meander spurline resonator and its implementation to a low‐phase noise oscillator , 2011 .

[16]  Xiaohong Tang,et al.  Ka‐band substrate integrated waveguide voltage‐controlled Gunn oscillator , 2010 .

[17]  Tatsuo Itoh,et al.  Broad-band power amplifier using dielectric photonic bandgap structure , 1998 .

[18]  Huey-Ru Chuang,et al.  A fully integrated 5.8 GHz U-NII band 0.18-μm CMOS VCO , 2003 .