Active antenna using parasitic elements

This paper proposes a coplanar waveguide-fed active antenna with the parasitic elements of half-wavelength dipole placed above the oscillator to improve the frequency stability. The quality factor of this antenna is increased by the parasitic element, which is not obtained by the conventional active antenna that is connected directly to the oscillator. This paper describes experimental results of this active antenna´s characteristics, power combining, and self-oscillating mixer (Cha and Itoh 1995).