US3784937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking capacitor for a thin-film rf transmission line
Assignee: HP Inc
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Filing: 1972-10-25
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Granted: 1974-01-08
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Expires: 1992-10-25
Abstract
Abstract A blocking capacitor is formed in the center conductor of a thin-film RF transmission line which is situated over a metal conductor and insulated from the center conductor and outer conductors of the transmission line. The distributed capacitor so formed couples RF signals over a broad frequency range while blocking DC and very low frequency signals on the transmission line.
Inventors
- 👤 W Jackson
- 👤 J Lamy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:51
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/004; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/10; H01G4/20; H01G4/33
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
123 words
A radio frequency transmission line having a blocking capacitor comprising: an insulative substrate; a ground conductor maintained in a fixed spatial relationship to the substrate; a conductive layer deposited on a first portion of the substrate; an insulative layer deposited over the conductive layer; and a signal conductor having a first and second segment deposited on a second portion of the substrate and on the insulative layer, with a gap between the first and second segment of the signal conductor forming an interdigital pattern over the conductive layer, the ground and signal conductors being substantially parallel in the region of the conductive layer to form a radio frequency transmission line having a constant characteristic impedance and being adapted to carry radio frequency signals.
Claim 2
Dependent Claim
123 words
A radio frequency transmission line having a blocking capacitor comprising: an insulative substrate; a ground conductor maintained in a fixed spatial relationship to the substrate; a conductive layer deposited on a first portion of the substrate; an insulative layer deposited over the conductive layer; and a signal conductor having a first and second segment deposited on a second portion of the substrate and on the insulative layer, with a gap between the first and second segment of the signal conductor forming an interdigital pattern over the conductive layer, the ground and signal conductors being substantially parallel in the region of the conductive layer to form a radio frequency transmission line having a constant characteristic impedance and being adapted to carry radio frequency signals.
Claim 3
Dependent Claim
18 words
A radio frequency transmission line as in claim 1 wherein the insulative layer comprises two different dielectric layers.
References Cited (Backward Citations)
US3310760A
Cited
US3560893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |