A new model to calculate the coupling coefficient for more accurate filter design and further development of narrowband-filter performance
✍ Scribed by Z. M. Hejazi; Z. Jiang
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 233 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
between the ground lines of 156 m demonstrated similar improvement. The results from the 60-m-wide microstrip lines suggest that maintaining a constant line width so that the probe pad structure is indistinguishable from the transmission line, if possible, is best. This allows direct probing of the transmission line without introducing error during the removal of probe-pad parasitics or correction for microstrip-width variations.
In either situation, it is then possible to implement the calibration-comparison method by inserting an impedance transformer to map the reference impedance of the measurement into the reference impedance Z 0 of the multiple, redundant line standards and the following the procedure given in [7][8][9]. Investigations continue to determine if following this approach results in a more accurate characteristic impedance determination.
The author thanks Dr. Mark Gouker from MIT Lincoln Laboratory for fabricating the transmission-line structures and providing all of the scattering-parameter measurements.
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