Design and Analysis of Quad-band Slotted Antenna for Wireless Applications

A compact quad-band slotted patch antenna with an octagonal design, measuring 27.5 mm × 22 mm × 1.6 mm, is implemented and analysed for its efficiency across multiple resonating characteristics. This antenna is optimized for four operating modes, supporting tetra wireless standards. Proposed design achieved S-band WLAN (2.4 GHz – IEEE 802.16b), C-band WLAN (5.0 GHz – IEEE 802.11j, 5.8 GHz – IEEE 802.11a), 5G NR bands (n40: 2.3–2.4 GHz, n46: 5.15–5.925 GHz, n47: 5.855–5.925 GHz, n96: 5.925–7.125 GHz, n102: 5.925–6.425 GHz, n104: 6.425–7.125 GHz), X-band (8–12 GHz for radar, space communication, and broadband), lower Ku-band (13.64–15.72 GHz for satellite communication), and upper Ku-band (16.32–17.24 GHz for molecular rotational spectroscopy) wireless communication applications. Proposed structure features an octagonal slotted radiating patch with double duplications and a trapezoidal partial ground part, designed on an FR-4 substrate material. Simulated results confirm its performance, showcasing favourable return loss, radiation patterns, gain, and efficiency across the targeted bands, with stable operation across the antenna’s resonating modes.