A dual-band rectangular shape incorporated into circular patch antenna for 2.4/5 GHz wireless local area network applications

Suthasinee Lamultree (Rajamangala University of Technology Isan Khonkaen Campus)
Nattakarn Somsanook (Rajamangala University of Technology Isan Khonkaen Campus)
Wararak Narkkoht (Rajamangala University of Technology Isan Khonkaen Campus)
Chuwong Phongcharoenpanich (King Mongkut’s Institute of Technology Ladkrabang)

TELKOMNIKA (Telecommunication Computing Electronics and Control)
Vol 23, No 1: February 2025

This research exhibits a design of a dual-band patch antenna (DBPA) implemented by a rectangular shape incorporated into a circular patch together with a pair of half-wavelength inverted U-slots (HWIUSs) with the single feed for 2.4/5 GHz wireless local area network (WLAN) applications. For this work, the HWIUSs are key in designing a dual-band antenna. The DBPA is fed by a 50-Ohm microstrip line, printed on a copper layer overlaid on an FR4 substrate with a relative permittivity of 4.3 and height of 1.6 mm, while the bottom layer is backed by a partial ground plane. An antenna prototype with a dimension of 0.384λ_L×0.304λ_L×0.013λ_L was contrived and admeasured to verify the simulation. The measurement provides a nearly omnidirectional pattern with a 2.55 and 3.3 dBi peak gain covering a dual-band 10 dB return loss bandwidth of 15% (2.4–2.8 GHz) and 20% (4.96–5.86 GHz), respectively. Noticeably, simulated |S11| and radiation patterns are reasonable following experimental results showing its potential in 2.4/5 GHz WLAN services.