Ka-Band Omnidirectional High Gain Stacked Dual Bicone Antenna

This communication presents a new omnidirectional antenna based on biconical antenna element to realize high gain and high omnidirectivity at Ka-band. Two biconical antenna elements are stacked and fed differentially by a specially designed differential feeding network embedded inside the antenna. Measurement shows that the -10-dB impedance bandwidth of the antenna is 14.2% (26.2-30.2 GHz), within which the antenna can achieve a high gain of around 12.5 dBi corresponding to a sharp 3-dB beamwidth of about 5° in the elevation plane. The ripple of the omnidirectional radiation pattern in the azimuth plane is smaller than ±0.5 dBi.