Tuesday, June 10, 2008

Design by Modelling

Analytical models are devised to provide an understanding of the operating principles that could be useful for a new design, for modifications to an existing design, and for the development of new antenna configurations. The objectives of antenna analysis are to predict the radiation characteristics such as radiation patterns, gain, polarization as well as near field characteristics such as input impedance, impedance bandwidth and antenna efficiency. The analysis of microstrip antennas is complicated by the presence of dielectric inhomogeneity, inhomogeneous boundary conditions, narrow frequency band characteristics, and a wide variety of feed, patch shapes and substrate configurations. Thus a trade-off is reached between the complexity and accuracy of the solution by compromising on one or more of the features.
The model chosen for analysis is a good one if it has the following characteristics.

  • It can be used to calculate all impedance and radiation characteristics of the antenna under discussion.
  • Its results are accurate enough for its intended purpose.
  • It is as simple as possible, while providing the required accuracy for impedance and radiation properties.
  • It lends itself to interpretation in terms of known physical phenomena.

1 comment:

Zakir said...

How the equivalent circuit of Microstrip antenna is obtained. Suppose we are making E shape structure on IE3D , how we will do the analysis part and how the equivalent circuit is made.