Abstract
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 ${\pm }{0}.{5}\;{\text{dBi}}$ .
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