US3697804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave generating apparatus including spurious signal suppression means
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1970-10-12
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Granted: 1972-10-10
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Expires: 1990-10-12
Abstract
Abstract A microwave generating apparatus is disclosed which includes suppression means for preventing high frequency signals from being propagated out of the apparatus through its cathode terminals to be radiated away from the apparatus. The suppression means includes a shield member and a non-saturating ferrite member positioned around each of the cathode heater leads of the apparatus within the shield member. The ferrite member comprises an elongated ferrite body having at least two apertures extending therethrough, with the lead element traversing both of these apertures in opposing directions.
Inventors
- 👤 Harold C Anderson
- 👤 David F Graff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:53
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/66
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
Microwave generating apparatus comprising, in combination: a magnetron including a pair of cathode terminals for receiving heater current, supply means for providing heater current having a predetermined frequency for said magnetron, suppression means for preventing high frequency signals from being propagated out of said magnetron through said cathode terminals and being radiated away from said magnetron, said suppression means comprising a conductive shield member enclosing the space immediately adjacent to said cathode terminals, a pair of conductive lead elements each having a first end being connected to a respective one of said cathode terminals and a second section extending outside of said shield member, and a respective non-saturating ferrite member positioned around each of said lead elements within said shield member, each ferrite member comprising a ferrite body having at least two apertures therethrough and in which the respective lead element for said ferrite member traverses both said apertures, and means for connecting said second sections of said lead elements to said supply means to conduct heater current to said magnetron.
Claim 2
Dependent Claim
171 words
Microwave generating apparatus comprising, in combination: a magnetron including a pair of cathode terminals for receiving heater current, supply means for providing heater current having a predetermined frequency for said magnetron, suppression means for preventing high frequency signals from being propagated out of said magnetron through said cathode terminals and being radiated away from said magnetron, said suppression means comprising a conductive shield member enclosing the space immediately adjacent to said cathode terminals, a pair of conductive lead elements each having a first end being connected to a respective one of said cathode terminals and a second section extending outside of said shield member, and a respective non-saturating ferrite member positioned around each of said lead elements within said shield member, each ferrite member comprising a ferrite body having at least two apertures therethrough and in which the respective lead element for said ferrite member traverses both said apertures, and means for connecting said second sections of said lead elements to said supply means to conduct heater current to said magnetron.
Claim 3
Dependent Claim
35 words
The combination of claim 1 in which said ferrite body is elongated and in which said apertures extend substantially longitudinally along said ferrite body and are substantially parallel to the longitudinal axis of said body.
Claim 4
Dependent Claim
29 words
The combination of claim 2 in which said suppression means further includes a respective high frequency by-pass capacitor connected Between each of said lead elements and said shield member.
Claim 5
Dependent Claim
62 words
The combination of claim 3 in which each of said capacitors is a coaxial capacitor positioned in a respective aperture in said sheld members and having its axial terminals connected in series with its respective lead element and having its concentric terminal connected to said shield member, whereby each of said capacitors also insulates its respective lead element from said shield member.
Claim 6
Dependent Claim
27 words
The combination of claim 4 in which each of said lead elements is positioned substantially entirely in a plane which is substantially normal to said cathode terminals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |