바렉터다이오드를 이용한 X-밴드 전압제어 발진기 개발

Abstract

A VCO (Voltage Controlled Oscillator) has been designed and fabricated at X-band frequency. The design parameters are optimized through ADS simulation tool. The operating characteristics and performance analysis of the implemented VCO based on the design parameters are accomplished. To tune the range of VCO, varactor diode has been connected at the tunable negative resistance in VCO. A VCO for enhancing the fundamental frequency 10.50G㎐～10.88G㎐ has been designed and fabricated in microstrip configuration on 0.508mm thick RT-duroid(ε=2.33) Teflon substrate. The frequency variations according to the voltage change 1～18V of varactor diode are from 10.50G㎐～10.88G㎐ and power level is 4.0～4.6dBm. The phase noise characteristics are -40.5dBc/Hz, -52.4dBc/Hz at 100KHz offset frequency.

Developed VCO is expected to be used for local oscillator which is one of the main device of radar system.