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Low Phase Noise VCO Using Microstrip Square Open Loop Resonator and Tunable Negative Resistance  

Choi, Jae-Won (Information and Telecommunication Engineering, Soongsil University)
Lee, Chong-Min (Information and Telecommunication Engineering, Soongsil University)
Seo, Chul-Hun (Information and Telecommunication Engineering, Soongsil University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.17, no.12, 2006 , pp. 1143-1149 More about this Journal
Abstract
The microstrip square open loop resonator has been employed to reduce the phase noise in VCO. The microstrip square open loop resonator has the large coupling coefficient value, which makes a high Q value, and has reduced the phase noise of VCO. To increase the tuning range of VCO, varactor diode has been connected at the tunable negative resistance in VCO. The output power and harmonic characteristics of VCO has been obtained 4.83 dBm and -28.83 dBc, respectively. The phase noise of VCO has been $-112.33{\sim}-116.16dBc/Hz$ @ 100 kHz in the tuning range, $5.735{\sim}5.845GHz$.
Keywords
Tunable Negative Resistance; Phase Noise; Square Open Loop Resonator;
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