Beam-Tilted All-Metal Radial-Line Slot Array Antenna with Uniform Spacing

This communication proposes an all-metal radial-line slot array antenna with a tilted beam, intended to mm-wave communications. Instead of modifying the array spacing along the beam tilt plane, an azimuthal variation of the propagation constant within the feeding waveguide is introduced. With this aim, the parallel-plate waveguide is loaded with a non-uniform bed of nails, tailoring each pin height accordingly. The operation principle and the design guidelines of this uniformly-spaced array are explained, and the beam-tilting performance is assessed.