Non-reciprocal broadband slot line device
AssigneeSociete Lignes Telegraphiques et Telephoniques
InventorsBernard Chiron, Michel DE Vecchis
Life of this patent
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Abstract
A broadband slot line non reciprocal microwave device which comprises a matched load placed on the face of a ferrite plate which is located within the microwave magnetic field of the slot line, said face being opposite to said slot and designed so that its height is larger than 3 times the width of the slot and its length is at least equal to a half wavelength as propagated within the slot at the maximum operating frequency. Said matched load may be a second slot line or a lossy ferrite plate. The device operates as an isolator with more than 20 dB isolation. It can be designed as a four port circulator.
Claims13
A wideband non-reciprocal microwave device comprising:
- a planar slot line formed of two metallic strips having a slot therebetween,
- a plate oriented parallel to said planar slot line and placed within the microwave field of said planar slot line, said plate made of gyromagnetic material, magnetized by a d.c. magnetic field both perpendicular to the slot and parallel to the plane of the slot line,
- at least one attenuation means placed against the face of the said plate which is most remote from the said slot line, wherein:
- said slot has a width l,
- said plate has a thickness h and a length L,
- the thickness h of the said plate is larger than 3 l, and
- the length L of the said plate is at least equal to a half wave length measured in the slot line at the maximum operating frequency.
Dependencies are inferred from the claim text.