Design of a Low Sidelobe and Multi-beam Rotman Lens Array Antenna

In this paper, the design and simulation of a low sidelobe multi-beam antenna are described. Slot-coupled microstrip antennas are used as array antenna elements. The feeding circuit consists of a T-type unequal power divider and a Rotman lens. The low sidelobe characteristic (≤−23dB) of non-scanning beam is realized by using the design of T-type unequal power divider. Combining the principle of linear phased array with the principle of Rotman lens design, the miniaturization of lens network is realized, and the antenna array can generate three beams in the 5.3-5.9 GHz band.