Analysis of Circular Microstrip Patch Antenna using Spherical Modal Expansion Technique

icrostrip antennas are finding increasing popularity by using their advantages in size, cost and conformity to supporting structure and easy of fabrication. In this paper analysis of circular patch, using Spherical modal Expansion technique (SM E) and design of circular patch at 8.2GHz using IE3D simulator is presented. The solution provided by SM E is analytical and therefore more efficient and accurate than numerical and ray tracing techniques. The properties of SM E are exploited to perform a precision calculation. A sample computation on circular patch is performed to demonstrate validity of this approach and is supported by experimental results.