US4642587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tapered five-port waveguide star junction
Assignee: Varian Medical Systems Inc
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Filing: 1985-05-29
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Granted: 1987-02-10
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Expires: 2005-05-29
Abstract
Abstract A matched lossless reciprocal five-port junction can be constructed as a tapered five-fold symmetric star. The dimensions of the leads are tapered in toward the center, such that the cutoff frequency is the upper band frequency divided by 1.66.
Inventors
- 👤 Majid Riaziat
- 👤 George A. Zdasiuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:52
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
A microwave junction assembly for matching five rectangular waveguides, over a frequency band having an upper frequency band edge and a lower frequency band edge, comprising: five tapered waveguide lead sections lying in the H-plane in a five-fold rotational symmetry around an axis of rotational symmetry perpendicular to said H-plane, said sections leading from a periphery at one end of said waveguide lead sections into a central junction region located on said axis and at an opposite end of said waveguide lead sections, each tapered waveguide lead section being tapered in a direction, in both cross-sectional dimensions, from said periphery to said central junction, each cross-sectional dimension being reduced by a factor of about 6/7 over the direction of the taper.
Claim 2
Dependent Claim
121 words
A microwave junction assembly for matching five rectangular waveguides, over a frequency band having an upper frequency band edge and a lower frequency band edge, comprising: five tapered waveguide lead sections lying in the H-plane in a five-fold rotational symmetry around an axis of rotational symmetry perpendicular to said H-plane, said sections leading from a periphery at one end of said waveguide lead sections into a central junction region located on said axis and at an opposite end of said waveguide lead sections, each tapered waveguide lead section being tapered in a direction, in both cross-sectional dimensions, from said periphery to said central junction, each cross-sectional dimension being reduced by a factor of about 6/7 over the direction of the taper.
Claim 3
Dependent Claim
46 words
A microwave junction assembly as in claim 1 wherein said junction is matched to the Ka microwave band by tapering each of said waveguide lead sections from dimensions of about 0.28 by 0.14 inches to about 0.24 by 0.12 inches in cross-section at said junction region.
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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |