US3789263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rf filters with glass on a substrate
Assignee: TE Connectivity Corp
•
Filing: 1972-02-04
•
Granted: 1974-01-29
•
Expires: 1992-02-04
Abstract
Abstract A low pass RF filter for high voltage feed-through to the filament of a magnetron. The filter comprises a ferrite substrate in the form of a sleeve with the outer surface of the sleeve carrying a dielectric layer comprising a lead oxide glass. The dielectric layer also comprises aluminum oxide to provide a rough surface for metal plating without increasing the coefficient of thermal expansion of the dielectric layer relative to the ferrite substrate.
Inventors
- 👤 N Sanders
- 👤 W Fritz
- 👤 J Tiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:11
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/66; H01R13/719; H01R13/7197; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H01P; H01P1/00; H01P1/20; H01P1/215; H03; H03H; H03H1/00; H03H1/0007
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
The filter of claim 1 wherein said dielectric layer is characterized by a rough surface, and said conduction means comprising metal plating adhering to said rough surface.
Claim 2
Dependent Claim
15 words
The filter of claim 1 wherein said dielectric layer is uniformly applied to said substrate.
Claim 3
Dependent Claim
11 words
The filter of claim 1 wherein said glass comprises lead oxide.
Claim 4
Dependent Claim
13 words
The filter of claim 1 wherein said dielectric layer further comprises aluminum oxide.
Claim 5
Dependent Claim
11 words
The lossy filter of claim 1 wherein said substrate comprises ferrite.
Claim 6
Dependent Claim
22 words
The filter of claim 1 wherein said glass is a low sodium glass characterized by low sodium ion migration at high temperatures.
Claim 7
Dependent Claim
19 words
The filler of claim 7 wherein the resistance of said glass is no less than one megaohm per cube.
Claim 8
Dependent Claim
205 words
A microwave system for use in an ambient of high temperature comprising: a magnetron having a filament; a filament transformer supplying a high voltage to said filament; and a distributed low pass RF filter means for feeding said high voltage through to said filament while preventing microwave energy of said magnetronx from being propogated back to the input of said filament transformer, said filter means comprising: a filter housing having a ground plane; a filter comprising a substrate and a dielectric layer carried by said substrate, said dielectric layer comprising glass characterized by low electrical leakage at ambient temperatures of 200*C to 300*C, wherein said substrate is in the form of a tube and said dielectric layer is carried directly by the exterior surface of said tube, said dielectric layer being characterized by a coefficient of thermal expansion which is less than the coefficient of thermal expansion for said substrate, the outer surface of said glass and the axial opening of said substrate being metal plated, the metal plating of said glass making electrical contact with said ground plane, and a pin connected between said filament and said filament transformer inserted within the metal plated axial opening of said substrate in electrical coupling relation therewith.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |