Experiment No. 5. Design, simulate and verify the radiation pattern of a circular
microstrip patch antenna
Aim:
To design and simulate the circular patch antenna using electromagnetic simulation tool and
plot its radiation characteristics.
Software Required:

Ansys Electromagnetic Desktop
Circular patch antenna:
The mode supported by the circular patch antenna can be found by treating the patch, ground
plane and the material between the two as a circular cavity. The radius of the patch is the only degree of
freedom to control the modes of the antenna (Balanis, 1982). The antenna can be conveniently analyzed
using the cavity model (Richards, 1988; Gonca, 2005). The cavity is composed of two electric conductors
at the top and the bottom to represent the patch and the ground plane and by a cylindrical perfect magnetic
conductor around the circular periphery of the cavity. The dielectric material of the substrate is assumed
to be truncated beyond the extent of the patch (Richards, 1988). The field configuration within the cavity
can be found using the vector potential.
Design of circular patch antenna:
The resonant frequency TMmn0 is given by
(1)
The dominant mode is TM110, whose resonant frequency is
(2)
The actual radius of the patch is given by
(3)
Simulation of an antenna design:
Figure 1. Microstrip circular patch antenna
Figure 2. Return loss
Figure 3. Radiation Pattern
Figure 4. 3D gain plot
Figure 5. 3D directivity plot
Rubrics Split up
Conduct of
Experiment
(15)
Observation
(15)
Record
(10)
Viva
(10)
Scale/
Dimension
Theoretical Understanding of Antenna trainer kits
Verification of connection using suitable cables
Marks
Awarded
(10)
(5)
Practical Understanding of radiation pattern and working
principle of antenna trainer kit
(10)
Tabulation
(5)
Presentation
(5)
Result and Calculation
Viva
(5)
(10)
Total Marks
Result:
Thus the circular patch antenna was designed and simulated using the electromagnetic simulation
tool.