Directional coupler and termination for stripline and coaxial co

Details Directional coupler and termination for stripline and coaxial co Directional coupler and termination for stripline and coaxial co

1988-10-25

1991-09-10

LaRoche, Eugene R.

Wave transmission lines and networks

Dissipating terminations for long lines

Fluid-cooling

333245, 333246, 338216, H01P 126

Patent

active

050477374

ABSTRACT:
A directional coupler having coupled striplines provided between ground planes includes dielectric layers having a dielectric constant greater than the dielectric constant of air interposed between the stripline conductors and each of the ground planes, thereby equalizing the propagation velocity of the odd and even modes to improve the directivity of the coupler. A planar termination for a coaxial conductor provides a soft mode change from the coaxial transmission mode to the TEM suspended substrate planar mode of the resistive element in the termination by inserting a planar resistive element into a slot in the coaxial conductor. The soft mode change reduces the reflections associated with a mode change, providing a planar termination which is easier to design and fabricate than a coaxial termination to be utilized. A planar termination for a stripline supports the stripline when used in a directional coupler and has a planar resistive element rotated ninety degrees with respect to the plane of the stripline so that there is no mode change between the stripline and the planar resistive element.

REFERENCES:
patent: 2438915 (1948-04-01), Hansen
patent: 3209284 (1965-09-01), Hast
patent: 3354412 (1967-11-01), Steidlitz
patent: 3621479 (1971-11-01), Peterson et al.
patent: 3678417 (1972-07-01), Ragan
patent: 3775706 (1973-11-01), Jones et al.
patent: 3790904 (1974-02-01), Lesgk et al.
patent: 4267531 (1981-05-01), Spinner et al.

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