Coupling device between an electromagnetic surface wave line and an external microstrip line
AssigneeThomson-CSF
InventorsGerard Forterre, Julien Prevot
Life of this patent
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Abstract
A device for coupling between an electromagnetic surface wave device (OSEL), operating in a symmetrical field distribution mode and an external microstrip line operating in a disymmetric mode. Coupling between the access microstrip to the surface wave device and the external microstrip is provided by means of three line elements made from dielectric materials, held in position by three non magnetic metal parts, forming a transition between symmetric and disymmetric modes in steps: electromagnetic surface wave mode, a symmetric mode of the surface wave device, three plate mode, microstrip mode with reactance matching, disymmetric microstrip mode of the external microstrip line.
Claims16
A device for coupling between a symmetric electromagnetic surface wave line and an external microstrip line, the surface wave line, ending in at least one access microstrip, operating in a symmetric field distribution mode, whereas the external microstrip line operates in a disymmetric field distribution mode, said coupling device including a plurality of line elements of small lengths and with transverse dimensions small with respect to the wave length of a signal, the nature and structure of these line elements providing a progressive transition between the symmetric and disymmetric modes in four steps:
- electromagnetic surface wave mode, a symmetric mode of the surface wave line,
- three plate mode implemented by a three plate mode line element,
- microstrip mode with two different dielectrics,
- air microstrip mode, a disymmetric microstrip mode of the external microstrip line.
Dependencies are inferred from the claim text.