Low-profile dipole antenna with ground plane by parasitic elements
Details
Since the dipole antenna is one of the fundamental antennas, the antenna has been utilized in various applications. The dipole antenna with ground plane has considerably simple structure and high gain. Usually, distance from the dipole antenna to the ground plane is set at λ/4(λ: wavelength). When the distance is less than λ/4, actual gain of the antenna is decreased due to impedance mismatching. In this paper, parasitic elements are utilized for impedance matching when the distance from the ground plane to the dipole antenna is shorter than ordinary. Through numerical analysis, it is shown that the distance from the ground plane to the dipole antenna can be shorten by about 0.05 wavelength.
