Properties of Strip Transmission Line, Volume 1
DEPARTMENT OF DEFENSE WASHINGTON DC
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Stripline components for high speed logic are compared to their equivalent waveguide components with respect to size and cost. Impedance measurements in Stripline at microwave frequencies require the use of a slotted line. Since commercial coaxial slotted lines are readily available and a Stripline laboratory model would be expensive and time consuming to produce, it was decided that the coaxial slotted line with its attendant transition was the best approach. It is in this transition that the problem arises. The junction introduces a discontinuity which must be taken into account. By making the rather good approximation that the junction is lossless, a bilinear transformation may be used to relate the two sides of the junction. A theoretical derivation is made and an example worked to illustrate the practical aspects of the solution. It was found that, while this method cannot be used to find the characteristic impedance of Stripline, if the characteristic impedance is known, the impedance of any unknown Stripline load can be found. Experimental verification of Stripline attenuation is shown using a Stripline Spiral. Good correlation is obtained between measured and theoretical values of attenuation up to 3.5 Kmc. A transfer function for Stripline is found using standard transmission line formulation. This transfer function is broken into two parts, dielectric response and skin effect response. A set of curves is given for dielectric response.
- Electrical and Electronic Equipment
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