  A multi-beam antenna with a dual band operation in the 28 GHz and 31 GHz
millimeter wave band is presented. The antenna has a gain of around 15 dBi in
each of the three ports. The spatial footprint of the antenna is 166 mm x 123
mm x 34 mm. A waveguide lens-based approach is used to attain this gain.
Cylindrical to planar wavefront transformation by a phase extraction and
compensation method drives the design of the antenna. The dual band operation
of the antenna aids in transmitting and receiving at two independent
frequencies. Three beams originating from a shared aperture are designed to
target directions of -60{\deg}, 0{\deg} and 60{\deg}. These features make the
antenna a potential candidate for 5G millimeter wave applications.
