Microstrip Antennas (MSA) finds wide applications in modern communication gadgets because of their light weight, small size and low cost. Annular Ring Microstrip antenna (ARMSA) also received considerable attention. This printed antenna is smaller in size in comparison with rectangular, circular and triangular patch antenna. For designing of the Annular Ring Microstrip patch antenna, researchers have given many formulae to calculate the parameters of antenna like inner and outer radius of antenna at a given frequency. But these formulae are very complex and have very large calculation and have no uniformity in the formulae. As the shape of the antenna changes the design formulae change completely. This paper presents a simple formula for the physical dimensions of the annular ring patch antenna. These set of formulae is validated by comparing the simulated and measured results for different substrates.
microstrip antenna, annular ring microstrip antenna, substrate