Wave transmission lines and networks – Coupling networks – Nonreciprocal gyromagnetic type
Patent
1985-11-27
1987-08-25
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Nonreciprocal gyromagnetic type
333248, H01P 137
Patent
active
046895850
ABSTRACT:
A transmission line comprising a multi-layer dielectric slab structure including: a dielectric substrate layer (30) having a thickness d.sub.s and permittivity .epsilon..sub.s ; a conductive ground plane (31) on the bottom surface of the dielectric substrate layer (30); a dielectric guiding layer (32) having a thickness h and permittivity .epsilon..sub.g, where .epsilon..sub.g >.epsilon..sub.s, attached to the top surface of dielectric substrate layer (30); at least one elongated and relatively narrow dielectric loading strip layer (33) having a width W, thickness d.sub.1, and permittivity .epsilon..sub.1, where .epsilon..sub.g >.epsilon..sub.1, attached to the top surface of the dielectric guiding layer (32); and a conductive coating (34) on the top surface of the dielectric loading strip layer (32). Such a structure permits single mode propagation over a relatively wide band. Radiation losses due to coupling of the desired mode to the substrate modes and the conductors are furthermore reduced and the polarization of the dominant mode is such as to render said structure relatively insensitive to small deviations from parallelism among the different interfaces. This invention is directed to multi-layer dielectric slab structures implemented in the form of a signal isolator.
REFERENCES:
patent: 3386787 (1968-06-01), Kaplan
patent: 3986147 (1976-10-01), Carter et al.
patent: 4034377 (1977-07-01), Knox et al.
patent: 4093345 (1978-06-01), Logan et al.
patent: 4459567 (1984-07-01), Stern et al.
patent: 4490700 (1984-12-01), Stern et al.
Chin Gay
Eisel James B.
Gensler Paul
Martin Marietta Corporation
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