Reduced height waveguide circulator
AssigneeElectromagnetic Sciences, Inc.
InventorsJohn C. Hoover, David E. Giese
Life of this patent
Estimating the term…
Abstract
A conductive waveguide structure has a central cavity of full height and input/output ports of a second reduced height emanating therefrom. A smaller ferrite circulator element is centrally disposed within the cavity and has outer extremities spaced from the inner edges of the reduced height input/output ports by a predetermined gap dimension "G" which is chosen to achieve an appropriate impedance match between the impedance of the ferrite element and the higher impedance of the wavguide without the necessity for the usual quarter-wave dielectric impedance matching transformer sections.
Claims21
A waveguide circulator comprising:
- a conductive waveguide structure having a cavity located therewithin of a first predetermined height and said cavity having plural input/output waveguides of a second lesser predetermined height emanating therefrom:
- a ferrite circulator element disposed within said central cavity and having an outer extremity spaced from an inner edge of at least one of said input/output waveguides by a gap G having a predetermined gap dimension which achieves an approximate impedance match between the impedance of the ferrite element and the higher impedance of a reduced height input/output waveguide and
- means for creating a magnetic field within said ferrite element and causing it to act as a circulator element.
A waveguide circulator comprising:
- a conductive waveguide structure having a central cavity located therewithin and said cavity having plural input/output waveguide ports emanating therefrom, at least one of said input/output waveguide ports being of reduced height compared to the height of said central cavity;
- and
- a ferrite circulator element of lesser dimensions than those of said cavity;
- and
- means for creating a magnetic field within said ferrite element and causing it to act as a circulator element;
- said element being disposed within said cavity and defining a gap G between a waveguide port of reduced height and an extremity of said element,
- said gap G being dimensioned to achieve an approximate impedance match between said element and said reduced height input/output waveguide port.
A reduced height waveguide circulator comprising:
- a Y-shaped ferrite circulator element having three legs spaced apart at 120.degree. angular intervals, having a height dimension h2 and a radial dimension R2;
- means for creating a magnetic field within said ferrite element and causing it to act as a circulator;
- a conductive waveguide structure having a cavity of height h1, where h1>h2, and of equilateral triangular cross-section and of radial dimension R=R2+G measured from the cavity center along a normal to a side of the cavity;
- and
- an input/output port waveguide of height h3, where h3<h2<h1, coupled to each side of the cavity,
- said circulator element being centrally located within the cavity with dielectric spacers above and below the element in the height dimension and said element also having each of its legs centrally aligned with a respective one of said input/output ports;
- said circulator element and the inner edge of said input/output ports thereby defining a gap of dimension G which causes the impedance of said circulator element to be approximately matched to the higher impedance of said waveguide structure.
Dependencies are inferred from the claim text.