Speaker: Professor Tapan. K. Sarkar, Department of Electrical and Computer
Engineering, Syracuse University, Syracuse, New York, USA
Date/Time: Thursday 29 November 2012 / 2:00 pm – 5:00 pm.
Seminar (1): 2:00 pm – 3:15 pm.
Questions, Discussion, Refreshments, and Networking: 3:15 pm – 3:35 pm.
Location: ME 4124, Mackenzie Engineering Building, Carleton University
Parking: Parking fees apply.
Registration: Free to attend, but registration is required.
To ensure a seat, please register by contacting Dr. Qingsheng Zeng (qingsheng.zeng@crc.gc.ca)
Organizer: Dr. Qingsheng Zeng
Organizer e-mail: qingsheng.zeng@crc.gc.ca
Organized by: IEEE Ottawa AP (Antennas and Propagation) / MTT (Microwave Theory and Techniques) Joint Chapter

Abstract: The objective of this presentation is to
illustrate that an electromagnetic macro modeling can properly predict
the path loss exponent in a mobile cellular wireless communication.
Specifically, we illustrate that the path loss exponent in a cellular
wireless communication is three preceded by a slow fading region and
followed by the fringe region where the path loss exponent is four.
Theoretically this will be illustrated through the analysis of radiation
from a vertical electric dipole situated over a horizontal imperfect
ground plane as first considered by Sommerfeld in 1909. To start with,
the exact analysis of radiation from the dipole is made using the
Sommerfeld formulation. The semi-infinite integrals encountered in this
formulation are evaluated using a modified saddle point method for field
points moderate to far distances away from the source point to predict
the appropriate path loss exponents. The reflection coefficient method
can also be derived by applying a saddle point method to the
semi-infinite integrals and it is shown not to provide the correct path
loss exponent. The various approximations used to evaluate the Sommerfeld
integrals are described for different regions. It is also important to
note that Sommerfeld’s original 1909 paper had no error in sign. However,
Sommerfeld overlooked the properties associated with the pole. Both
accurate numerical analyses along with experimental data are provided to
illustrate the above statements. Both Okumura’s experimental data and
experimental data taken from different base stations in urban
environments at two different frequencies will validate the theory.
Experimental data reveal that a macro modeling of the environment using
an appropriate electromagnetic analysis can accurately predict the path
loss exponent for the propagation of radio waves in a cellular wireless
communication scenario.