Patent US4928078A successfully refreshed from Google Patents.
US4928078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Branch line coupler
Assignee: HP Inc
•
Filing: 1988-12-22
•
Granted: 1990-05-22
•
Expires: 2008-12-22
Abstract
Abstract A branch line coupler is disclosed. The device is comprised of multiple ports and branch lines, every two such lines being connected in a junction point. Each branch line has a width which is narrow at each end and increases in a curvilinear manner toward the middle. By virtue of the width design, the device performs the same functions as a conventional coupler, but for much higher frequencies.
Inventors
- 👤 Chandra Khandavalli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:35
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/19; H01P5/22; H01P5/227
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A branch line coupler for transmission line signal conditioning of the type having a plurality of branch line coupler arms connected at a junction point, each said branch line coupler arm having a substantially linear shape including a middle and two ends, wherein the improvement comprises each said branch line coupler arm thinning in a curvilinear manner from the middle toward each end.
Claim 2
Dependent Claim
63 words
A branch line coupler for transmission line signal conditioning of the type having a plurality of branch line coupler arms connected at a junction point, each said branch line coupler arm having a substantially linear shape including a middle and two ends, wherein the improvement comprises each said branch line coupler arm thinning in a curvilinear manner from the middle toward each end.
Claim 3
Dependent Claim
25 words
The branch line coupler according to claim 1 in which each branch line coupler arm consists of two exponentially tapered sections connected back to back.
Claim 4
Dependent Claim
15 words
The branch line coupler according to claim 1 which is built in a stripline configuration.
Claim 5
Dependent Claim
15 words
The branch line coupler according to claim 1 which is built in a planar configuration.
Claim 6
Dependent Claim
34 words
The branch line coupler according to claim 1 wherein the number of branch lines is two for dividing an incoming signal to the junction point into two parts with a 90 degree phase difference.
Claim 7
Dependent Claim
63 words
A branch line coupler comprising multiple ports and branch line coupler arms, each branch line coupler arm having two ends and a middle, every two such branch line coupler arms being connected at a junction point and each branch line coupler arm having a width which increases in a curvilinear manner from each of the ends toward the middle of the branch line.
Claim 8
Dependent Claim
63 words
A branch line coupler comprising multiple ports and branch line coupler arms, each branch line coupler arm having two ends and a middle, every two such branch line coupler arms being connected at a junction point and each branch line coupler arm having a width which increases in a curvilinear manner from each of the ends toward the middle of the branch line.
Claim 9
Dependent Claim
23 words
The branch line coupler according to claim 6 wherein four such branch line coupler arms are connected together in a generally rectangular configuration.
Claim 10
Dependent Claim
69 words
The branch line coupler according to claims 2 or 7 wherein a length of each branch line coupler arm is a predetermined function of a desired coupling factor and a characteristic impedance of each branch line coupler arm exponentially decreases over half of the length of the branch line coupler arm from one end and then exponentially increases over the remaining half of the branch line coupler arm's length.
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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |