Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Reexamination Certificate
1995-02-17
2001-11-06
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
C333S164000
Reexamination Certificate
active
06313716
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to meander lines, and particularly to such meander lines which exhibit slow wave propagation characteristics.
2. Statement of the Prior Art
It is known to use delay lines for the purposes of time delay and phase adjustment of r.f. and h.f. signals. One particular embodiment of delay line is a meander line in which a single transmission line follows a serpentine route across the width of an area as it proceeds along the length of that area. One particular adaptation of delay lines is known as a slow wave line because wave propagation therethrough is slower than it would be for a simple delay line of the same length.
SUMMARY OF THE INVENTION
Accordingly, it is a object of the present invention to provide a meander line delay line.
It is a further object of the present invention to provide such a meander line which exhibits slow wave propagation characteristics.
It is yet a further object of the present invention to provide such a slow wave meander line which has a tunable length.
The present invention provides a meander line, comprising: a electrically conductive plate; a plurality of transmission line sections supported with respect to the conductive plate, wherein the plurality of sections includes a first section located relatively closer and parallel to the conductive plate to have a relatively lower characteristic impedance with the conductive plate and a second section located parallel to and at a relatively greater distance from the conductive plate than the first section to have a relatively higher characteristic impedance with the conductive plate; and connector means for interconnecting the first and second sections and maintaining an impedance mismatch therebetween.
REFERENCES:
patent: 3899757 (1975-08-01), Nakagami et al.
patent: 4729510 (1988-03-01), Landis
patent: 7201 (1985-01-01), None
patent: 4096401 (1992-03-01), None
Gomes David W.
Lee Benny
Lockheed Martin Corporation
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