Abstract
In this paper, the dual-band voltage-controlled oscillator (VCO) using the composite right/left-handed (CRLH) transmission line (TL) and the tunable negative resistance based on the pin diode is presented. It is demonstrated that the CRLH TL can lead to metamaterial transmission line with the dual-band tuning. The dual-band of the CRLH TL is achieved by the frequency offset and the phase slope of the CRLH TL. The tunable negative resistance based on the pin diode has been used to operate the dual-band of VCO. The phase noise of VCO is −108.34 ∼ −106.67 dBc/Hz @ 100 kHz in the tuning range, 2.423 ∼ 2.597 GHz for the forward bias of the pin diode, whereas that of VCO is −114.16 ∼ −113.33 dBc/Hz @ 100 kHz in the tuning range, 5.137 ∼ 5.354 GHz for the reverse bias of the pin diode.
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