Design Microstrip Patch Antenna and Role of Hexaferrite Cavity in X-band

A micro strip patch antenna with hex ferrite cavity at different permittivity and height is proposed. The proposed antenna design is simulated on electromagnetic (EM) simulation software and fabricated using FR-4 substrate with dielectric constant of 4.4 and thickness of 1.6mm. The proposed antenna has a compact structure with a total size of 50.8 × 50.8mm². The fractional bandwidth of antenna decreases as increases of permittivity of hex ferrite cavity. Similarly if height of hex ferrite increases the return loss decreases and fractional bandwidth also decreases. The antenna is composed of a dielectric resonator, a micro strip fed stepped patch and an intermediate substrate. The stepped patch and the intermediate substrate allow widening the matching bandwidth. The proposed antenna offers a fractional bandwidth of 35% around the center frequency 10GHz, and relatively stable radiation pattern in the matching band. The structure was simulated for (e_r = 20, μ_r = 1.2) X-band (8.2 to 12.4GHz) range with the frequency of fundamental mode, which is a hybrid mode, is around 10GHz. The simulated results and modeling results show the good agreement with the proposed scheme.