In this paper we propose a circular leaky wave-antenna with omnidirectional radiation in the H-plane. The design utilizes double-layered strips to create an end-fire antenna. A linear tapering of the stripes in the design endows the antenna with a 27% impedance bandwidth of 26.4-34.6 GHz. The antenna is vertically polarized with a cross polarization below -30 dB. The antenna has low gain variation in H-plane and it is compact as a planar structure. Furthermore, it can be easily fabricated and integrated by standard PCB processing techniques, which is very promising for applications such as base stations for wireless communication, spectrum monitoring and jamming systems.
Wang, L., Jonsson, B. L. G., & R. Mosig, J. (2017). Wideband omnidirectional planar antenna with vertical polarization. In 2017 11th European Conference on Antennas and Propagation (EUCAP)  IEEE. https://doi.org/10.23919/EuCAP.2017.7928581