The document discusses the simulation and analysis of a slot-coupled patch antenna at different frequencies using HFSS software. It describes the structure of the antenna, which consists of a rectangular patch separated from the ground plane by an air gap and dielectric material. The paper simulates the antenna at 2.25 GHz, 3.25 GHz, and 4.5 GHz. It analyzes the return loss and radiation patterns at each frequency. The results show that bandwidth increases at higher frequencies but radiation patterns degrade, indicating a tradeoff between bandwidth and frequency of operation.