US3851279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tee junction waveguide circulator having dielectric matching posts at junction
Assignee: Raytheon Co
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Filing: 1973-10-17
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Granted: 1974-11-26
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Expires: 1993-10-17
Abstract
Abstract A broadband tee junction waveguide circulator of improved design is disclosed. A ferrite element of triangular cross-section is disposed in the region of the junction of the two waveguides. Dielectric matching ''''posts'''' extending between the broad walls of the waveguide junction near each of the apexes of the ferrite element provide improved impedance matching. The matching posts present independently adjustable capacitive susceptances to the propagating wave energy in the three arms of the device for matching purposes and minimize higher order mode conversion. Those higher order modes which are generated are below cut-off and decay rapidly. The advantages of this configuration are its light weight, relatively small size and ease of tuning.
Inventors
- 👤 C Andrikian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:45
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/383; H01P1/39
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A microwave circulator comprising, in combination: three rectangular conductively bounded waveguide sections joined to form a common tee junction and having a pair of opposite broad walls at said junction; at least one slab-like element of gyromagnetic material of substantially triangular shape disposed within said junction, one apex of said gyromagnetic element being substantially coincident with the axis of the side arm of said tee junction; three dielectric elements of substantially solid cylindrical cross-section disposed within said junction, each of said dielectric elements extending between said opposite broad walls with one element being immediately adjacent each of the apexes of said gyromagnetic element; and means for subjecting said gyromagnetic element to a magnetic field directed normal to said broad walls.
Claim 2
Dependent Claim
120 words
A microwave circulator comprising, in combination: three rectangular conductively bounded waveguide sections joined to form a common tee junction and having a pair of opposite broad walls at said junction; at least one slab-like element of gyromagnetic material of substantially triangular shape disposed within said junction, one apex of said gyromagnetic element being substantially coincident with the axis of the side arm of said tee junction; three dielectric elements of substantially solid cylindrical cross-section disposed within said junction, each of said dielectric elements extending between said opposite broad walls with one element being immediately adjacent each of the apexes of said gyromagnetic element; and means for subjecting said gyromagnetic element to a magnetic field directed normal to said broad walls.
Claim 3
Dependent Claim
120 words
A microwave circulator comprising, in combination: three rectangular conductively bounded waveguide sections joined to form a common tee junction and having a pair of opposite broad walls at said junction; at least one slab-like element of gyromagnetic material of substantially triangular shape disposed within said junction, one apex of said gyromagnetic element being substantially coincident with the axis of the side arm of said tee junction; three dielectric elements of substantially solid cylindrical cross-section disposed within said junction, each of said dielectric elements extending between said opposite broad walls with one element being immediately adjacent each of the apexes of said gyromagnetic element; and means for subjecting said gyromagnetic element to a magnetic field directed normal to said broad walls.
Claim 4
Dependent Claim
120 words
A microwave circulator comprising, in combination: three rectangular conductively bounded waveguide sections joined to form a common tee junction and having a pair of opposite broad walls at said junction; at least one slab-like element of gyromagnetic material of substantially triangular shape disposed within said junction, one apex of said gyromagnetic element being substantially coincident with the axis of the side arm of said tee junction; three dielectric elements of substantially solid cylindrical cross-section disposed within said junction, each of said dielectric elements extending between said opposite broad walls with one element being immediately adjacent each of the apexes of said gyromagnetic element; and means for subjecting said gyromagnetic element to a magnetic field directed normal to said broad walls.
Claim 5
Dependent Claim
27 words
The circulator according to claim 1 wherein said element of gyromagnetic material is supported within said junction between a pair of dielectric support members and conductive pedestals.
Claim 6
Dependent Claim
18 words
The microwave circulator according to claim 3 wherein said posts have a dielectric constant between nine and 15.
Claim 7
Dependent Claim
106 words
A microwave circulator comprising, in combination: first, second and third sections of rectangular, conductively bounded waveguide, said waveguide sections abutting to form a common H-plane tee junction with said first and second sections extending coaxially and said third section extending at a right angle to said first and second sections; at least one slab-like element of gyromagnetic material of substantially triangular shape disposed within said junction; at least three dielectric elements of substantially solid cylindrical cross-section disposed within said junction, one of said dielectric elements being adjacent each of the apexes of said gyromagnetic element, and means for subjecting said gyromagnetic element to a magnetic field.
Claim 8
Dependent Claim
106 words
A microwave circulator comprising, in combination: first, second and third sections of rectangular, conductively bounded waveguide, said waveguide sections abutting to form a common H-plane tee junction with said first and second sections extending coaxially and said third section extending at a right angle to said first and second sections; at least one slab-like element of gyromagnetic material of substantially triangular shape disposed within said junction; at least three dielectric elements of substantially solid cylindrical cross-section disposed within said junction, one of said dielectric elements being adjacent each of the apexes of said gyromagnetic element, and means for subjecting said gyromagnetic element to a magnetic field.
Claim 9
Dependent Claim
44 words
The circulator according to claim 5 wherein one apex of said gyromagnetic element substantially coincides with the axis of said third waveguide section and the opposite side of said gyromagnetic element substantially coincides with the common axis of said first and second waveguide sections.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |