Wave transmission lines and networks – Long line elements and components – Strip type
Patent
1991-05-09
1992-12-29
Gensler, Paul
Wave transmission lines and networks
Long line elements and components
Strip type
333260, H01P 100
Patent
active
051755220
ABSTRACT:
The ends of two strip transmission line substrates which meet at an interface are supported by resting on top of a sandwich structure made up of a dielectric, a circular metal choke member and a conductive pedestal. The choke member, the dielectric and the ground planes of the substrates form a low-loss RF ground connection to bridge the gap at the interface. The choke member, the dielectric and the ground planes form a quarter wave open circuited transmission line stub in the form of a circular structure. This structure acts as an RF choke and reflects a short circuit into the region between the ground planes, making a virtual connection between the ground planes and the metal choke member. The strip transmission line substrates and the metallic choke member are not rigidly connected, thus allowing for relative movement between the substrate and choke member due to differences in thermal expansion or contraction. A semicircular choke is employed at an interface between a strip transmission line substrate and a coaxial connector, or at an interface between a strip transmission line substrate and a microwave circuit element such as a high-power solid state microwave power amplifier transistor.
REFERENCES:
patent: 3908185 (1975-09-01), Martin
patent: 4208642 (1980-06-01), Saunders
patent: 4782313 (1988-11-01), Brant, Jr.
Clark Robert T.
Quick Dean C.
Denson-Low Wanda K.
Gensler Paul
Hughes Aircraft Company
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