Browse Prior Art Database

Ferrite Y Circulator

IP.com Disclosure Number: IPCOM000096984D
Original Publication Date: 1962-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bland, GF: AUTHOR

Abstract

The microwave Y circulator has ferrite material of a nonuniform diameter disposed in a symmetrical strip transmission circuit for providing an increased isolation bandwidth.

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Ferrite Y Circulator

The microwave Y circulator has ferrite material of a nonuniform diameter disposed in a symmetrical strip transmission circuit for providing an increased isolation bandwidth.

The Y circulator includes an H-plane junction of three identical strip transmission lines represented by a first, second and third center conductors 10, 12 and 14. Each forms equal angles of 120 degrees with each other center conductor. Conductors 10, 12 and 14 are disposed between upper and lower layers 16 and 18 of dielectric material which, preferably, has a dielectric constant of 1. Layers 16 and 18 are disposed between upper and lower ground plates 20 and 22. A first upper ferrite cylinder 24 is located above the junction of conductors 10, 12 and 14. A first lower ferrite cylinder 26 having dimensions similar to those of cylinder 24 is aligned with 24 below the junction of conductors 10, 12 and 14. A second upper ferrite cylinder 28 having a diameter substantially larger than that of cylinder 24 is disposed between 24 and upper plate 20. Cylinder 30 has dimensions similar to those of cylinder 28 and is disposed between cylinder 26 and plate 22. Cylinders 24, 26, 28 and 30 are magnetized by a D.C. field which is polarized normal to the plane of the transmission lines, as indicated by the arrows HDC. The cylinders are disposed about the plane of conductors 10, 12 and 14 at the junction thereof in a symmetrical manner.

For a fixed polarity of D.C. magnetic field HDC, microwave energy entering the Y circulator at conductor 10 is coupled with a low loss to conductor 12, with very little energy being coupled to conductor 14. Likewise, energy entering at conductor 12 is coupled to conductor 14 and conductor 10 is isolated. When energy enters at condu...