Millimeter wave circulator
AssigneeVarian Associates, Inc.
InventorPaul H. Wolfert
Life of this patent
Estimating the term…
Abstract
A millimeter wave wideband circulator which employs a triangular ferrite prism with symmetrically grooved sides. The prism is configured to support a pair of closely-spaced higher order resonance mode sets which function to enlarge the bandwidth of the circulator and to suppress spurious mode resonances in the center and roll-off portions of the bandpass. The simplicity of the junction design combined with the non-critical alignment requirement of the ferrite prism makes practical the fabrication of a multi-junction millimeter wave circulator in a single integrated housing.
Claims17
A broadband waveguide Y-junction millimeter wave circulator comprising:
- a statically magnetized ferrite prism possessing a pair of flat parllel ends and three identical vertical sides which extend between said ends, said three vertical sides each possessing at least one continuous vertical groove disposed therein.
A millimeter wave circulator comprising:
- a housing containing a right circular cylindrical cavity extending about a central vertical axis;
- three coplanar H-plane waveguides uniformly spaced around said central vertical axis to form a Y-junction;
- a concentric circular recess disposed in one circular inside surface of said cavity forming a surrounding rim thereof;
- a ferrite prism possessing three identical vertical sides extending between a pair of parallel end surfaces, each of said three vertical sides possessing a pair of vertical grooves disposed symmetrically about a plane through the centerline of and normal to said each vertical side, said ferrite prism centered above said concentric circular recess with portions of one of said pair of end surfaces fixedly mounted to said rim thereof;
- and
- means for statically magnetizing said ferrite prism along said central vertical axis.
A millimeter wave circulator according to claim additionally comprising:
- a dielectric annulus coaxially disposed adjacent the other circular inside surface of said cavity.
A millimeter wave circulator comprising:
- a housing containing a right circular cylindrical cavity extending about a central vertical axis;
- three coplanar H-plane waveguides uniformly spaced around said central vertical axis to form a Y-junction;
- a ferrite prism possessing three identical vertical sides extending between a pair of parallel end surfaces, each of said three vertical sides possessing a pair of vertical grooves disposed symmetrically about a plane through the centerline of and normal to said each vertical side, said ferrite prism coaxially disposed along said central vertical axis;
- a dielectric spacer possessing parallel end surfaces sandwiched between one circular inside surface of said cavity and one of said pair of end surfaces of said ferrite prism, said dielectric spacer having vertical sides extending between said parallel end surfaces substantially coextensive with said three vertical sides of said ferrite prism;
- and
- means for statically magnetizing said ferrite prism along said central vertical axis.
A millimeter wave circulator comprising:
- a housing containing a right circular cylindrical cavity of length L and radius R extending about a central vertical axis;
- three coplanar H-plane wave guides of height X and width 2X uniformly spaced around said central vertical axis to form a Y-junction;
- a concentric circular recess of radius r and depth d disposed in one circular inside surface of said forming a surrounding rim thereof;
- a ferrite prism possessing three vertical sides of height H extending between a pair of parallel end surfaces each possessing a set of three apices which define an equilateral triangle of height E, each of said three vertical sides possessing a pair of continuous vertical grooves disposed symmetrically about a plane through the centerline of and normal to said each vertical side, said ferrite prism centered above said concentric circular recess with portions of one of said pair of end surfaces fixedly mounted to said rim thereof;
- and
- means for statically magnetizing said ferrite prism along said central vertical axis.
Dependencies are inferred from the claim text.