T-Shaped Resonator for X-Band Applications

This article presents theoretically and experimentally the T-shaped resonator with negative index for microwave X-band frequencies (8-12 GHz). The T-shaped resonator is designed on the substrate FR-4 to operate over multiple bands from 8.45-8.68 GHz, 9.47-9.68 GHz and 11.32-11.44 GHz theoretically and 8.46-8.66 GHz, 9.33-9.60 GHz and 11.43-11.60 GHz experimentally. The negative permittivity, permeability and refractive index of the structure have been verified using transmission-reflection (TR) technique using S parameters. The proposed structure resonates for X Band applications such as radar and short wave communication.