Lubecke, Victor M. and McGrath, William R. and Rutledge, David B. (1993) A 100 GHz coplanar strip circuit tuned with a sliding planar backshort. IEEE Microwave and Guided Wave Letters, 3 (12). pp. 441-443. ISSN 1051-8207. http://resolver.caltech.edu/CaltechAUTHORS:LUBieeemgwl93
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A means of mechanically altering the electrical length of a planar transmission line would greatly enhance the use of integrated circuit technology at millimeter and submillimeter wavelengths. Such a mechanically adjustable planar RF tuning element, successfully demonstrated at 100 GHz, is described here. It consists of a thin metallic sheet, with appropriately sized and spaced holes, which slides along on top of a dielectric-coated coplanar-strip transmission line. Multiple RF reflections caused by this structure add constructively, resulting in a movable RF short circuit, with |s11|≫APX=/-0.3 dB, which can be used to vary the electrical length of a planar tuning stub. The sliding short is used here to produce a 2-dB improvement in the response of a diode detector. This tuning element can be integrated with planar circuits to compensate for the effect of parasitic reactance inherent in various devices including semiconductor diodes and superconductor-insulator-superconductor (SIS) junctions.
|Additional Information:||© Copyright 1993 IEEE. Reprinted with permission. Manuscript received July 28, 1993; revised September 23, 1993. The research described in this paper was jointly sponsored by the Innovative Science and Technology Office of the Ballistic Missile Defense Organization, and the National Aeronautics and Space Administration (NASA), Office of Advanced Concepts and Technology. V. M. Lubecke holds a NASA GSRP Fellowship. We would like to thank Dr. P.A. Stimson for his encouragement and invaluable assistance in the fabrication of the test circuit and Dr. P.H. Siegel for generously providing the dielectric parabola and mount.|
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