Wave transmission lines and networks – Long line elements and components – Strip type
Patent
1990-12-06
1992-05-19
Gensler, Paul
Wave transmission lines and networks
Long line elements and components
Strip type
333263, 343700MS, 455327, H01P 128
Patent
active
051152177
ABSTRACT:
A device for tuning a circuit includes a substrate, a transmission line on the substrate that includes first and second conductors coupled to a circuit to be tuned, and a movable short-circuit for varying the impedance the transmission line presents to the circuit to be tuned. The movable short-circuit includes a dielectric layer disposed atop the transmission line and a distributed shorting element in the form of a conductive member that is configured to be slid along at least a portion of the transmission line atop the dielectric layer. The conductive member is configured to span the first and second conductors of the transmission line and to define at least a first opening that spans the two conductors so that the conductive member includes first and second sections separated by the first opening. The first and second sections of the conductive member combine with the first and second conductors of the transmission line to form first and second low impedance sections of transmission line, and the opening combines with the first and second conductors of the transmission line and the dielectric layer to form a first high impedance section of transmission line intermediate the first and second low impedance sections. Each of the first low impedance section and the first high impedance section have a length along the transmission line of approximately one-quarter wavelength, thus providing a periodic variation of transmission line impedance. That enhances reflection of rf power.
REFERENCES:
patent: 2543721 (1951-02-01), Collard et al.
patent: 2752499 (1956-06-01), Hanthorn
patent: 2915717 (1959-12-01), LaRosa
patent: 2961620 (1960-11-01), Sommers
patent: 3405375 (1968-10-01), Kelley
patent: 3421118 (1969-01-01), Engelbrecht
patent: 4096453 (1978-06-01), Rogers
patent: 4955085 (1990-09-01), Woody
Lubecke Victor M.
McGrath William R.
California Institute of Technology
Gensler Paul
Hanson Loyal M.
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