June 14, 2009
June 14, 2009
June 17, 2009
Electrical and Computer
14.463.1 - 14.463.11
Development and Evaluation of a Characteristic Impedance Calculator Amendra Koul1, Keith Hoover2, Vysakh Sivarajan1, Jianjian Song2, Edward Wheeler2, James Drewniak1 1 Missouri University of Science and Technology 2 Rose-Hulman Institute of Technology
Abstract This paper presents our development and evaluation of a transmission line characteristic impedance calculator that offers visualization and immediate feedback. Several impedance calculators based on closed-form equations are reviewed in terms of their functionality, accuracy and validity. Two example problems from our calculator are then presented to show how our calculator operates. The accuracy of our calculator for characteristic impedance and per-unit- length capacitance and inductance compares well with that of a commercial 2-D field solver for a range of geometries such as microstrip, stripline, embedded microstrip and asymmetric stripline. Our calculator is written in Matlab and its executable program will be made available on the internet.
1 Introduction Simulation tools with visualization and immediate feedback are effective in engaging interest and in helping them to learn. Visualization appeals to a broad range of learning styles and helps students develop solid conceptual understanding vital for engineering design and application 1. Instant feedback permits students to vary model parameters and to see their affect on the system's response immediately 2,3. In short, simulation tools which permit both visualization and immediate feedback provide an engaging space in which the user can experiment and explore freely.
This paper reports on the development and evaluation of a transmission line characteristic impedance calculator with visualization and instant feedback. The calculator will be made freely available on the internet. Several calculators are currently available on the internet, some being free-of-charge and some available for purchase. Many of these calculators have limited functionalities and have little or no performance evaluation and validation data.
Our calculator employs established closed-form equations from the open literature. We have made great effort to verify them against commercial tools as described in this paper. It includes geometries such as microstrip, stripline, embedded microstrip, and asymmetric stripline. It is compared in terms of functionality, accuracy and validity against other free online impedance calculators also based on closed-form equations. In addition, performance evaluation data of our calculator are also presented over a broad solution space against those obtained from a 2-D field solver, Hyperlynx from Mentor Graphics. The results of the evaluation show that our calculator produces results comparable to Hyperlynx for microstrip and stripline.
The calculator will be especially helpful to engineering students as they explore a variety of transmission lines line behavior and develop the intuitive knowledge needed for design,
Koul, A., & Hoover, K., & Sivarajan, V., & Song, J., & Wheeler, E., & Drewniak, J. (2009, June), Development And Evaluation Of A Characteristic Impedance Calculator Paper presented at 2009 Annual Conference & Exposition, Austin, Texas. 10.18260/1-2--4705
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