Single Coaxial-Feed Compact Dual-Band LLISlotted Microstrip Patch Antenna for Wireless Communication Systems

This study introduces a compact microstrip patch antenna design & simulation for dual-band operations in WiMAX ($2.5-2.63 \mathrm{GHz}$) and WLAN (5.15-5.35 GHz), including two UNII frequency bands: low (5.15-5.25 GHz) & mid (5.25-5.35 GHz). With dimensions of $15 \mathrm{~mm} \times 9 \mathrm{~mm} \times 7 \mathrm{~mm}$ and a ground plate size of $\mathbf{4 0 ~ m m ~ x ~} \mathbf{4 0 ~ m m}$, the design utilizes a foam substrate with a relative permittivity of approximately 1. By incorporating slots and a shorting wall, the design achieves effective miniaturization and multiband resonance frequencies. Simulation results show satisfactory parameters, including coverage with bandwidths of 130 MHz and 600 MHz, maximum gains of 1.9 dBi and 5.3 dBi, and VSWR values of 1.01 and 1.04 at 2.57 GHz and 5.13 GHz, respectively. The antenna exhibits radiation efficiencies of $49.44 \%$ at 2.5 GHz and $94.05 \%$ at 5.13 GHz, with effective impedance matching achieved without an external network. All analysis has been performed using the ZELAND IE3D tool.