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US3723914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lumped constant quadrature coupler with improved parasitic suppression
Assignee: Individual
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Filing: 1972-01-26
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Granted: 1973-03-27
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Expires: 1992-01-26
Abstract
Abstract A lumped constant quadrature hybrid coupler having a wide band of directivity is disclosed. The coupler is constructed from lumped constant elements including a pair of closely magnetically coupled conductors with a lumped capacitor connecting them at a central portion. Each of the two respective ends of each of the pair of conductors serve as one of the four ports of the resulting coupler. Three printed circuit embodiments are disclosed which incorporate the teachings of this invention.
Inventors
- 👤 J Cappucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:01
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
A quadrature hybrid coupler including: a first conductor having first and second ends and a midpoint; a second conductor having first and second ends and a midpoint; means for maintaining said first and second conductors in close magnetic relationship to provide coupling therebetween, said first and second coupled conductors having a leakage inductance and a predetermined capacitance therebetween; a capacitor having first and second plates exhibiting a capacitance therebetween large compared to said predetermined capacitance; means for electrically connecting said first plate of said capacitor to said first conductor at said midpoint of said first and second ends thereof; and said second plate of said capacitor to said second conductor at said midpoint of said first and second ends thereof to symmetrically dispose said leakage inductance with respect thereto; and means connected to said first and second ends of said first and second conductors for forming constant K end sections with said symmetrically disposed leakage inductance.
Claim 2
Dependent Claim
156 words
A quadrature hybrid coupler including: a first conductor having first and second ends and a midpoint; a second conductor having first and second ends and a midpoint; means for maintaining said first and second conductors in close magnetic relationship to provide coupling therebetween, said first and second coupled conductors having a leakage inductance and a predetermined capacitance therebetween; a capacitor having first and second plates exhibiting a capacitance therebetween large compared to said predetermined capacitance; means for electrically connecting said first plate of said capacitor to said first conductor at said midpoint of said first and second ends thereof; and said second plate of said capacitor to said second conductor at said midpoint of said first and second ends thereof to symmetrically dispose said leakage inductance with respect thereto; and means connected to said first and second ends of said first and second conductors for forming constant K end sections with said symmetrically disposed leakage inductance.
Claim 3
Dependent Claim
45 words
The quadrature hybrid coupler as defined in claim 1 also including an insulating substrate having first and second sides and said first and second conductors are maintained in close magnetic relationship by being held on said first and second sides, respectively, of said insulating substrate.
Claim 4
Dependent Claim
30 words
The quadrature hybrid coupler as defined in claim 2 in which said first and second plates of said capacitor are formed on said first and second side of said substrate.
Claim 5
Dependent Claim
31 words
The quadrature hybrid coupler as defined in claim 3 in which said first and second conductors are wrapped about a center to provide self-inductance increasing the inductance per unit length thereof.
Claim 6
Dependent Claim
45 words
The quadrature hybrid coupler as defined in claim 4 in which said first and second plates of said capacitor are formed at said center on said first and second sides of said substrate and form a central portion of said first and second conductors respectively.
Claim 7
Dependent Claim
29 words
The quadrature hybrid coupler as defined in claim 3 in which said first and second conductors are spirally arranged to provide self-inductance increasing the inductance per unit length thereof.
Claim 8
Dependent Claim
42 words
The quadrature hybrid coupler as defined in claim 4 in which said first and second plates of said capacitor are connected to said first and second conductors, respectively, by conductors affixed to said first and second sides, respectively, of said insulating substrate.
Claim 9
Dependent Claim
45 words
The quadrature hybrid coupler as defined in claim 2 in which said first and second plates of said capacitor are formed at said center on said first and second sides of said substrate and from a central portion of said first and second conductors respectively.
References Cited (Backward Citations)
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |