US3582831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low reluctance resonant structure in waveguide for isolating dc magnetic fields
Assignee: RCA Corp
•
Filing: 1969-03-18
•
Granted: 1971-06-01
•
Expires: 1989-03-18
Abstract
Abstract The deleterious interaction of DC magnetic fields, where closely spaced, latching ferrite, waveguide circulators are employed, is overcome by the placement of a magnetic shield in the waveguide between the circulators.
Inventors
- 👤 Wieslaw W Siekanowicz
- 👤 Thomas E Walsh
- 👤 Donald J Blattner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:19
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/383; H01P1/39
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
In a waveguide having an aperture bounded by conductive walls for providing the coupling of radio frequency signals from a first end thereof to a second end thereof where it is desirable to isolate DC magnetic fields at said first end from said second end, the improvement comprising: a structure of the type presenting a low reluctance magnetic path to said DC magnetic field covering a major cross sectional area of a Portion of said inner aperture of the waveguide between said first and second ends to isolate said DC magnetic fields, said structure being arranged to provide resonant coupling of signals at said radio frequency.
Claim 2
Dependent Claim
106 words
In a waveguide having an aperture bounded by conductive walls for providing the coupling of radio frequency signals from a first end thereof to a second end thereof where it is desirable to isolate DC magnetic fields at said first end from said second end, the improvement comprising: a structure of the type presenting a low reluctance magnetic path to said DC magnetic field covering a major cross sectional area of a Portion of said inner aperture of the waveguide between said first and second ends to isolate said DC magnetic fields, said structure being arranged to provide resonant coupling of signals at said radio frequency.
Claim 3
Dependent Claim
21 words
The combination as claimed in claim 1 wherein said structure has at least one aperture therein resonant at said radio frequency.
Claim 4
Dependent Claim
16 words
The combination as claimed in claim 1 wherein the material of said structure is soft iron.
Claim 5
Dependent Claim
94 words
In combination: a first and second waveguide device each operable over a given frequency range and each of the type including a piece of gyromagnetic material located in the waveguide which in response to a DC magnetic field bias, controls the propagation of electromagnetic waves through the device, said first and second devices coupled together by means of a common waveguide section, said waveguide section including a resonant iris resonant at the operating frequency of said devices and being of a material to act as a DC magnetic shield to said DC magnetic field.
Claim 6
Dependent Claim
94 words
In combination: a first and second waveguide device each operable over a given frequency range and each of the type including a piece of gyromagnetic material located in the waveguide which in response to a DC magnetic field bias, controls the propagation of electromagnetic waves through the device, said first and second devices coupled together by means of a common waveguide section, said waveguide section including a resonant iris resonant at the operating frequency of said devices and being of a material to act as a DC magnetic shield to said DC magnetic field.
Claim 7
Dependent Claim
15 words
The combination as claimed in claim 4 wherein said first and second devices are circulators.
Claim 8
Dependent Claim
28 words
The combination as claimed in claim 4 wherein more than half of the cross sectional area of a portion of said waveguide is obscured by said resonant iris.
Claim 9
Dependent Claim
14 words
The combination as claimed in claim 6 wherein said resonant iris is soft iron.
Claim 10
Dependent Claim
14 words
The combination as claimed in claim 7 wherein said soft iron is silver plated.
References Cited (Backward Citations)
US928204A
Cited
US3466571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |