Design and fabrication of the 2.4 to 2.5 GHz voltage controlled oscillator using microstrip patch antenna

마이크로스트립 패치 안테나를 이용한 2.4 ~ 2.5GHz 에서 동작하는 전압 조정 발진기의 설계 및 제작

Solid-state devices can be directly integrated with a planar antenna to form active antenna elements. In this paper, the voltage controlled oscillator (VCO) is designed and fabricated at 2.4 to 2.5 GHz using a microstrip patch antenna. A varactor diode is used as avariable reactance. The predicted frequency tuning range of the VCO is 2.448 to 2.498 GHz in the design procedure and the fabricated VCO has 2.446 to 2.498 GHz frequency tuning range when the varactor tuning voltage is varied from 0 to 11V. Transmitted power output of the patch antenna which serves both as a rsonator and a radiating element for VCO is about 18 mW over this tuning range.