Compact Slotted Millimeter-Wave Rectangular Radiator for 5G-II Band Applications with Multiple Design Variants

A Compact Slotted Millimeter-Wave Rectangular Radiator for 5G-II Band Applications with Multiple Design Variants is the focus of this antenna design. The primary objective is to strike a balance between complexity and size efficiency. A central slotted rectangular patch is featured on the front side of the antenna, consisting of three circular elements positioned on the top. The central feed mechanism is established through a 50-ohm strip line that connects to a microstrip line. Meanwhile, the rear side of the antenna incorporates three rectangular slots on the bottom plane to enhance performance at higher frequencies. To assess its performance, the antenna undergoes simulations utilizing CST Microwave Studio. The substrate used is an FR-4 with dimensions measuring 12x10x1.5 cubic millimeters and an electrical size of .08λ *.07λ *.010λ. The simulation outcomes reveal impressive attributes, including an extensive impedance bandwidth of 60% and a return loss of −30 dB. These characteristics span the frequency range from 21.5 to 40 GHz, with a central frequency at 30.75 GHz. The radiation patterns maintain consistency throughout the operational range, exhibiting stable polar patterns and delivering efficient performance. The antenna demonstrates a broad gain of 4 dBi and an efficiency rating of 82%. These results underscore the suitability of the proposed antenna for microwave applications in the Millimeter-wave and 5G-II bands.