US4035748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial impedance transducer pad
Assignee: Bunker Ramo Corp
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Filing: 1975-09-24
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Granted: 1977-07-12
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Expires: 1995-09-24
Abstract
Abstract A coaxial impedance matching device employing film resistors in place of conventional rod and disc resistors. In a preferred embodiment, an elongated rectangular film resistor is deposited across the middle of a square insulation substrate with a pair of metal strips along opposite edges of the substrate and contacting the ends of the film resistor. Center metalized contacts are made to opposite sides of the film resistor, the lengths of contact with the sides being determined by the impedances of the cables to be connected thereto.
Inventors
- 👤 Keijiro Kusaka
- 👤 Yasushi Otomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:02
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22; H01P1/225; H01P5/00; H01P5/02; H01P5/022; H01P5/026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
193 words
An impedance matching device comprising: a rectangular insulative substrate; a first conductive strip carried along one edge of said substrate; a second conductive strip insulated from said first conductive strip and carried along an edge of said substrate opposite said one edge; a film resistor deposited on said substrate extending between said conductive strips; an input third conductive strip on said substrate between and insulated from said first and second conductive strips and connected to said film resistor, said input third conductive strip having a predetermined dimension in the direction transverse to said first and second conductive strips; and an output fourth conductive strip on said substrate between and insulated from said first and second conductive strips and disposed on the side of said film resistor opposite said input third conductive strip and connected to said film resistor, said fourth output conductive strip having a predetermined dimension in a direction transverse to said first and second conductive strips that is different from the corresponding predetermined dimension of said input third conductive strip to define an exponential impedance curve in said film resistor between the connections thereto of said third and fourth conductive strips.
Claim 2
Dependent Claim
193 words
An impedance matching device comprising: a rectangular insulative substrate; a first conductive strip carried along one edge of said substrate; a second conductive strip insulated from said first conductive strip and carried along an edge of said substrate opposite said one edge; a film resistor deposited on said substrate extending between said conductive strips; an input third conductive strip on said substrate between and insulated from said first and second conductive strips and connected to said film resistor, said input third conductive strip having a predetermined dimension in the direction transverse to said first and second conductive strips; and an output fourth conductive strip on said substrate between and insulated from said first and second conductive strips and disposed on the side of said film resistor opposite said input third conductive strip and connected to said film resistor, said fourth output conductive strip having a predetermined dimension in a direction transverse to said first and second conductive strips that is different from the corresponding predetermined dimension of said input third conductive strip to define an exponential impedance curve in said film resistor between the connections thereto of said third and fourth conductive strips.
Claim 3
Dependent Claim
17 words
The impedance matching device set forth in claim 1, wherein said film resistor is rectangular in shape.
Claim 4
Dependent Claim
69 words
The impedance matching device set forth in claim 1 wherein said conductive strips are printed metal strips, and further comprising: U-shaped members for clamping onto the edges of said substrate and electrically contacting said first and second conductive strips; and a pair of electrical contacts each having a slot therein for receiving an edge of said substrate and electrically contacting respective ones of said third and fourth conductive strips.
Claim 5
Dependent Claim
51 words
The impedance matching device set forth in claim 3, in combination with a connector body for housing said device, said connector body having longitudinal grooves therein for slidingly receiving said U-shaped members, said body including spring elements in said grooves for biasing said U-shaped members into electrical contact with said body.
Claim 6
Dependent Claim
44 words
The impedance matching device set forth in claim 3 including a cylindrical sleeve having opposed internal longitudinal grooves receiving said U-shaped members in electrical engagement, said sleeve including spring elements in said grooves for biasing said U-shaped members into electrical contact with said sleeve.
Claim 7
Dependent Claim
51 words
The impedance matching device set forth in claim 5 in combination with a connector body for housing said sleeve containing said substrate, said housing comprising two connector parts and a coupling ring for joining said connector parts to effect a forced electrical connection between said sleeve and said two connector parts.
References Cited (Backward Citations)
US3227975A
Cited
US3260971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |