Octagonal Shaped Frequency Reconfigurable Antenna for Wi-Fi and Wi-MAX Applications

In present day communication systems, reconfigurable antennas have attained much prominence due to the ease of shifting frequency bands without change in the original structure of the antenna. In this paper, a frequency band reconfigurable microstrip octagonal patch antenna has been simulated and analyzed with four switchable states consisting of four narrow bands. By simulating the antenna, four frequency bands are achieved 0.1–1.1, 2.2–3.4, 4.8–5.2, and 7.4–7.8 GHz with return loss s₁₁ < −10 dB. The designed antenna has plain structure with size of 40 × 40 mm². To achieve switching, we used PIN diodes which are placed at the slotted structure on the ground plane. The software HFSS is used for simulation. From results, it is evident that there is a change in reconfigurability of the antenna with the change in positions of internal switches. The change in antenna parameters like return loss, directivity, and gain characteristics is evident.