Wideband Dielectric Characterization Of Triethylene Glycol Dimethacrylate Ester Plastic

Open Access
Sharma, Kapil
Graduate Program:
Electrical Engineering
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 05, 2013
Committee Members:
  • Sedig Salem Agili, Thesis Advisor
  • Aldo W Morales, Thesis Advisor
  • free space technique
  • transmission line technique
  • coaxial airline
  • scattering parameters
  • air-gap
  • NRW
  • RPI
  • HFSS
Plastic materials form an important constituent of connectors and PCB substrates which are indispensable for connector and printed circuit industries. Plastics such as FR-4, PTFE (Teflon), PVC and silica glass are some of the commonly used materials for connector and printed circuit fabrication. With high-speed electronics being the increasing trend, computers, electronic chips and other electronic devices are progressively moving to higher frequencies with CPU speeds approaching 5 GHz and more in the future. Many systems are operating in 1-10 GHz range, and in the future, applications running at frequencies as high as 20 GHz with high data rates will be feasible. Knowledge of the performance of the materials constituting these devices is an imperative and challenging research task for designers. Dielectric characterization of plastic materials commonly used in electronic devices over a wide frequency range determines the electrical performance of the plastics and in turn of the electronic devices at high frequencies. In this thesis, wideband dielectric characterization of Triethylene Glycol Dimethacrylate Ester (TrEGDMA) organic plastic material (named Visi Jet SR-200 commercially) is performed using coaxial airline technique in the frequency range of 1-18 GHz and free space measurement technique in the frequency range of 8-12 GHz. This organic plastic has not been characterized over such a wide frequency range, therefore, dielectric characterization of this plastic is the main contribution of the research. The coaxial airline technique has been used to perform accurate measurements of dielectric properties of the plastic over frequency range of 1-18 GHz. A simulation analysis is also performed using known material (Teflon) as well as unknown plastic material to be characterized (TrEGDMA) to determine reflection and transmission coefficients and compare them with the measured results. Dielectric models for the measured permittivity data have been proposed to analytically describe the frequency dependency of dielectric properties of the TrEGDMA plastic over 1-18 GHz frequency range which is another important contribution of the research. Extraction of permittivity from measured scattering parameters using analytical closed form expressions has also been described. The dielectric characterization of the TrEGDMA plastic material will contribute towards determining the signal integrity performance of interconnects with this plastic as a substrate and will help to determine whether or not the material is fit to be used as a substrate in interconnects for high speed data transmission.