Modified U-Slot Dual-Band Microstrip Patch Antenna for Ku-Band Applications

This paper presents the design, simulation, and measurement of a dual-band U-slot microstrip patch antenna optimized for Ku-band satellite communication systems. The proposed antenna employs a U-slot technique and an aperture-coupled feed to achieve dual-band functionality. The simulation results demonstrate operational frequencies of $10.9-13 \mathrm{GHz}$ and $13.9-14.72 \mathrm{GHz}$, with gains of 5.208 dBi and 3.014 dBi. The measurement results validate the simulated performance, showing the practical operation at 11.18 to 12.9 GHz and 13.97 to 14.29 GHz, with corresponding gains of 5.05 and 3.62 dBi. Although the antenna successfully achieved dual-band operation, minor frequency shifts and reduced bandwidth in the lower frequency band highlight challenges to fully meet the target specifications. These results indicate the potential of the proposed U-slot antenna for compact dual-band satellite communication applications, with future work required to address remaining discrepancies and improve performance consistency.