Active Planar Antenna Loaded with Variable Capacitor

Abstract

Though microstrip antennas have advantages of small, light weight and low profile, it has a narrow frequency performance. In this paper, a novel frequency tunable antenna is proposed to improve the frequency performance. This antenna is loaded with variable capacitors on the fed element. The resonant frequency can be controlled by the capacitance of the varactor diode. The characteristics of this antenna are calculated by FDTD method and are also verified experimentally.