Patent US4121180A successfully refreshed from Google Patents.
US4121180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband directional coupler
Assignee: TECHNICAL RES AND Manufacturing Inc
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Filing: 1976-12-27
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Granted: 1978-10-17
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Expires: 1996-12-27
Abstract
Abstract A four port directional coupler using two substantially identical transformers, each transformer having a turn ratio N with a substantially pure resistive impedance across both of the transformer's secondary windings and a substantially pure resistive impedance connecting the transformer's primary windings, whereby the coupling coefficient, C, of the directional coupler is a function of the said resistive impedances and N and is substantially a continuous function of the values of said resistive impedances for any independently selected value of N.
Inventors
- 👤 Thomas H. Greenway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:18
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/48
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A directional coupler having four terminals A, B, C and D comprising, (a) a first transformer having a primary circuit and a secondary circuit referred to herein as the first primary and first secondary circuits, respectively, (b) a second transformer having a primary circuit and a secondary circuit referred to herein as the second primary and second secondary circuits, respectively, (c) said first primary circuit providing terminals A and B, and (d) said second primary circuit providing terminals C and D, (e) secondary circuit resistive impedance means connected in parallel with said first and second secondary circuits, (f) primary circuit resistive impedance means connecting said first and second primary circuits, and (g) whereby a frequency input signal at A appears at B and C in substantially the same phase and is substantially isolated from D.
Claim 2
Dependent Claim
135 words
A directional coupler having four terminals A, B, C and D comprising, (a) a first transformer having a primary circuit and a secondary circuit referred to herein as the first primary and first secondary circuits, respectively, (b) a second transformer having a primary circuit and a secondary circuit referred to herein as the second primary and second secondary circuits, respectively, (c) said first primary circuit providing terminals A and B, and (d) said second primary circuit providing terminals C and D, (e) secondary circuit resistive impedance means connected in parallel with said first and second secondary circuits, (f) primary circuit resistive impedance means connecting said first and second primary circuits, and (g) whereby a frequency input signal at A appears at B and C in substantially the same phase and is substantially isolated from D.
Claim 3
Dependent Claim
17 words
A directional coupler as in claim 1 wherein, (a) the first and second transformers are substantially identical.
Claim 4
Dependent Claim
61 words
A directional coupler as in claim 2 wherein, (a) said primary circuit resistive impedance means is R 2 and is connected between points in the first primary and second primary circuits both in one of said planes of symmetry, and (b) said secondary circuit resistive impedance means is R 1 and is connected in parallel to each of said secondary circuits.
Claim 5
Dependent Claim
68 words
A directional coupler as in claim 2 wherein, (a) said primary circuit resistive impedance means includes a resistance R 3 ' connecting corresponding points of terminals A and C and an equal resistance R 3 " connecting corresponding points of terminals B and D, and (b) said secondary circuit resistive impedance means is R 1 and is connected in parallel to both the first and second secondary circuits.
Claim 6
Dependent Claim
27 words
A directional coupler as in claim 2 wherein, (a) any one of said terminals is terminated with a load impedance to provide a three terminal directional coupler.
Claim 7
Dependent Claim
23 words
A directional coupler as in claim 2 for which the electrical circuit is physically symmetrical with respect to each of two perpendicular planes.
Claim 8
Dependent Claim
28 words
A directional coupler as in claim 2 wherein, (a) all electrical coupling between said primary circuits is through said secondary circuits and said primary circuit resistive impedance means.
Claim 9
Dependent Claim
61 words
A directional coupler as in claim 3 wherein, (a) said primary circuit resistive impedance means is R 2 and is connected between points in the first primary and second primary circuits both in one of said planes of symmetry, and (b) said secondary circuit resistive impedance means is R 1 and is connected in parallel to each of said secondary circuits.
Claim 10
Dependent Claim
68 words
A directional coupler as in claim 3 wherein, (a) said primary circuit resistive impedance means includes a resistance R 3 ' connecting corresponding points of terminals A and C and an equal resistance R 3 " connecting corresponding points of terminals B and D, and (b) said secondary circuit resistive impedance means is R 1 and is connected in parallel to both the first and second secondary circuits.
Claim 11
Dependent Claim
37 words
A directional coupler as in claim 7 wherein, (a) the coupling coefficient, C, of said directional coupler is a function of the said primary and secondary circuit resistive impedance means and the transformation ratio of said transformers.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |