Aruna Gunawardena

  • Citations Per Year
Learn More
A 3-D finite difference time domain (FDTD) simulation is done on a ground penetrating radar (GPR) operating above lossy and dispersive grounds. The radar consists of a pair of resistor-loaded bow-tie antennas and the ground consists of Puerto Rico clay loam. The clay loam is modeled by using a two term Debye model with a static conductivity. The simulation(More)
The ground penetrating radar (GPR) designs demand antennas with ultra wide bandwidths (UWB). Thus the conventional antennas such as dipoles cannot be used effectively. The GPR antennas are expensive. In this paper, the feasibility of building a low cost ultra-wide band bow-tie antenna for GPR using widely available low cost materials such as FR-4 PCB(More)
The design and simulation of a wideband coupler for improved directivity is investigated. The coupled line coupler is considered for weak (or lose) coupling purposes. An improved bandwidth performance is achieved by increasing the number of stages of the coupled line coupler, thus resulting in a Multi stage coupler. The research focuses on the 3 stage(More)
Measurement of dielectric properties of copper clad printed circuit boards using microstrip ring resonators is a well-studied problem widely in use. The problem addressed here is different from this as the sample under test is difficult to copper clad. The sample is placed on a ring resonator fabricated on a printed circuit board of known dielectric(More)
The ground penetrating radar (GPR) is a specialized radar used to obtain images of the objects buried under the ground surface. In this study, we discuss an experimental GPR setup that can be built using a vector network analyzer. The objective was to develop the GPR to operate in the range of 200 MHz to 700 MHz. The cavity backed bow-tie antenna, power(More)
  • 1