Miniature omnidirectional planar antenna for wideband vertical polarization applications

A novel miniature omnidirectional planar antenna for wideband vertical polarization applications is presented in this paper. This paper discusses a miniaturization technique in designing the compact omnidirectional antenna. Two shorting pins technique is applied to a well-know planar antenna structure whose radiation characteristics are similar to equivalent monopole ones. The typical dimension (radius) of the presented antenna is 0.1 λ₀ (λ₀ being the free space operating wavelength) which makes it a miniature antenna that can be integrated inside some portable wireless devices which have strict restriction for the antenna´s size using wideband communication systems. The proposed antenna input impedance bandwidth is 20% (720MHz) with respect to the center frequency of f0 GHz. It exhibits good radiation pattern in H-plan with small gain variations (<;0.6dBi).