Evaluation of Discontinuities in Microstrip Transmission Lines by Picosecond Time Domain Reflectometry Technique

Abstract

The narrow and wide trace discontinuities in microstrip transmission lines are designed and fabricated on glass-epoxy board by standard printing circuit board (PCB) technology. These discontinuities are characterized by evaluating their characteristic impedance (Z₀), excess inductance (ΔL), excess capacitance (ΔC), and peak percent reflection (p_max), by single ended time domain reflectometry (TDR) technique at room temperature. It is observed that narrow trace discontinuities lead to increase in values of characteristic impedance and inductance while wide trace discontinuities lead to decrease in characteristic Impedance and capacitance. The experimental values of various parameters like characteristic impedance, Z₀ excess inductance, ΔL, excess capacitance, ΔC, and maximum peak reflection, p_max, are found to be in good agreement with their corresponding theoretical values.

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Notes on contributors

B R Sharma

B R Sharma was born in 1961. He received his MSc Physics degree with specialization in Nuclear Physics in 1984 from Marathwada University Aurangabad. He is working as a lecturer in Physics in Pratishtan Mahavidyalaya, Paithan. He received MPhil degree in Physics from University of Pune in outstanding grade in 1995. Currently he is working for PhD degree in physics under the guidance of Dr S C Mehrotra. His interested topics are, microstripline devices, Time domain reflectometry and transmission techniques, complex permittivity spectra in GHz region.

V P Pawar

V P Pawar was born in 1966. He completed his MSc in Applied Electronics in 1988 from Marathwada University Aurangabad. He is working as a lecturer in Electronics in Maharashtra Udaygiri College, Udgir. He obtained his MPhil (Electronics) degree in 1998 from Shivaji University, Kolhapur. Under U G C IXth plan he has completed PhD degree under the guidance of Dr S C Mehrotra from Dr B A M University Aurangabad. His interested subjects include molecular interactions in various liquids.

N M More

N M More was born in the year 1966. He received MSc (Physics) degree with specialization in Electronics in 1989 from Marathwada University Aurangabad. He joined as a Lecturer in Physics in Shri Chhatrapati Shivaji College, Omerga, on 1st Jan 1990. Under UGC IXth plan period he has submitted PhD thesis at Dr B A M University Aurangabad under the guidance of Dr S C Mehrotra. He is interested in properties of “bound-water” in biological systems.

S C Mehrotra

S C Mehrotra was born in 1951. He received MSc (Physics) from Allahabad University in 1970 and PhD from University of Texas at Austin in 1975. He is recipient of UGC carrier award and Alexander Von Humbolt fellowship. Presently, he is professor in the department of Computer Science at Dr B A M University Aurangabad. He is actively engaged in research work and has published more than hundred research papers in national and international reputed journals.