Design of Circular Microstrip Patch with Spaced Dielectric Superstrates

Abstract

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 h 2 /h increases. The % change in f r w. r. to Circular Microstrip Patch is 1.96% and 9.52 % respectively for ε r2 = 2.32 & ε r3 = 10.2 for ε 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 h 2 /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 ε r3 = 3.5 and 10.2 at h 2 /h = 1.5 w. r. to circular microstrip patch f r 2.678 GHz . This expression is suitable for CAD on desk.

Performance Analysis of Circular Microstrip Patch Antenna With Dielectric Superstrates

“…Since the dimension of the patch is treated a circular loop, the actual radius of the patch is given by (Balanis, 1982) a= (22) Where F = Equation (1) does not take into considerations the fringing effect. Since fringing makes the patch electrically larger, the effective radius of patch is used and is given by (Balans, 1982)…”