analyzed with respect to the number of antenna elements and the size of UCA. In our
analysis, we assume that beamforming is done on the azimuth plane by using UCA. Then,
we show that the maximum directivity on the target direction increases with Θ (N 3/2), where
N is the number of antenna elements in UCA. In addition, vertical and horizontal beamwidths
decrease with Θ (1/√ N) and Θ (1/N), respectively.