Design of Circular Microstrip Patch with Spaced Dielectric Superstrates

This paper presents the simple design expressions for circular microstrip patch with spaced dielectric and covered dielectric loaded with ice. The resonant frequency of circular microstrip antenna with cover dielectric decreases as h₂/h increases. The % change in f_r w. r. to circular microstrip patch is 1.96% and 9.52% respectively for epsiv_r2 = 2.32 & epsiv_r3 = 10.2 for epsiv_r1 = 2.94 & h₂/h=9.52. The effect of loaded ice on covered circular microstrip patch further lower down the resonant frequency. Its effect is more on f_r for small h₂/h ratio. The intention or unintentional air-gap brings down the f_r of circular microstrip patch. Spaced dielectric effect on f_r is more for small air-gap. The % change in f_r for spaced dielectric superstrate is 1.58% and 3.05 % for epsiv_r3 = 3.5 and 10.2 at h₂/h = 1.5 w. r. to circular microstrip patch f_r 2.678 GHz . This expression is suitable for CAD on desk.