DocumentCode :
2287748
Title :
A VCO with harmonic suppressed and output power improved using defected ground structure
Author :
Liu, Hai-Wen ; Sun, Xiao-Wei ; Li, Zheng-Fan
Author_Institution :
Dept. of Electron. Eng., Shanghai Jiao Tong Univ., China
Volume :
1
fYear :
2003
fDate :
20-23 Sept. 2003
Firstpage :
163
Abstract :
In this paper, a novel defected ground structure (DGS) is proposed for suppressing harmonic and increasing the output power of a voltage-controlled oscillator (VCO) in microwave circuits. The DGS is formed with connecting in parallel two periodic structures which have different center frequencies (in a ratio of 2:3) of the stopband and provides the bandgap characteristic in certain frequency bands. Simulated and experimental results show that the microstrip line with DGS has a wide low-pass band for the fundamental frequency and a stopband for the second harmonic with good performance. To evaluate the effects of DGS on microwave VCOs, 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 50Ω straight line. Measured results show that DGS suppresses the second harmonic more than -20dBm at the output and yields improved output power by 3-5%.
Keywords :
III-V semiconductors; MESFET integrated circuits; MMIC oscillators; field effect MMIC; gallium arsenide; harmonics suppression; microwave photonics; periodic structures; photonic band gap; voltage-controlled oscillators; 50 ohm; GaAs; MESFET; bandgap effect; defected ground structure; field-effect transistor VCO; harmonic suppression; microstrip line; microwave circuits; output power; parallel periodic structures; photonic bandgap; voltage-controlled oscillator; Circuit simulation; Frequency; Joining processes; Microstrip; Microwave circuits; Periodic structures; Photonic band gap; Power generation; Power system harmonics; Voltage-controlled oscillators;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave and Optoelectronics Conference, 2003. IMOC 2003. Proceedings of the 2003 SBMO/IEEE MTT-S International
Print_ISBN :
0-7803-7824-5
Type :
conf
DOI :
10.1109/IMOC.2003.1244851
Filename :
1244851
Link To Document :
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