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The paper proposes an electrically small pattern reconfigurable antenna, which allows flexible beamforming with the antenna diameter being ?/5. The antenna has 3 ports, each designed to radiate a different spherical mode. By applying appropriate phase shift the antenna allows to flexibly sweep its bi-directional radiation pattern across a 360° azimuth, while offering 5 dBi directivity.
Narbudowicz, A., Ammann, M.J. & Marchetti, N. (2018). Miniaturized Switchless Pattern Reconfigurable Antenna Utilizing Spherical Modes Analysis. 12th European Conference on Antennas and Propagation, EuCAP 2018, London, 9-13th April 2018. doi:10.1049/cp.2018.0568