Abstract
A switchable multibeam antenna array with a compact planar feeding network is presented. Operating within 1 GHz bandwidth at 28 GHz, this 4 × 4 antenna can generate onebeam, two-beam and four-beam patterns based on two phase states, which are controlled by the reconfigurable feeding network. The whole structure is validated by simulating in CST Studio. The antenna is a promising candidate in millimeterwave Massive MIMO for applications where multiple beams are required simultaneously.