US4688009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triple-pane waveguide window
Assignee: Varian Medical Systems Inc
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Filing: 1985-05-13
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Granted: 1987-08-18
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Expires: 2005-05-13
Abstract
Abstract A waveguide window contains a central transverse pane of a material with high dielectric constant such as alumina ceramic. The central pane is an integral number of half-wavelengths thick. On each side of the central pane and immediately adjacent it is a side pane of material with relatively low dielectric constant such as fused quartz. The side panes are odd numbers of quarter-wavelengths thick. The dielectric constants of the side panes are preferably the square root of the dielectric constant of the central pane. The improved wave impedance matching provides a low wave reflection over a wide frequency band.
Inventors
- 👤 Patrick E. Ferguson
- 👤 Andrew L. Nordquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A waveguide window comprising: a section of hollow waveguide adapted to transmit a wave with transverse electric field; a first pane of dielectric having a first dielectric constant, extending across the open cross-section of said guide; a second pane of dielectric having a second dielectric constant extending substantially across said cross-section, said second pane having a surface adjacent a first transverse surface of said first pane; a third pane of dielectric having a third dielectric constant extending substantially across said cross-section, said third pane having a surface adjacent the second transverse surface of said first pane, said transverse surfaces are planes perpendicular to the direction of propagation of said wave; the dielectric constants of said second and third panes being substantially equal to the square root of said first dielectric constant.
Claim 2
Dependent Claim
131 words
A waveguide window comprising: a section of hollow waveguide adapted to transmit a wave with transverse electric field; a first pane of dielectric having a first dielectric constant, extending across the open cross-section of said guide; a second pane of dielectric having a second dielectric constant extending substantially across said cross-section, said second pane having a surface adjacent a first transverse surface of said first pane; a third pane of dielectric having a third dielectric constant extending substantially across said cross-section, said third pane having a surface adjacent the second transverse surface of said first pane, said transverse surfaces are planes perpendicular to the direction of propagation of said wave; the dielectric constants of said second and third panes being substantially equal to the square root of said first dielectric constant.
Claim 3
Dependent Claim
201 words
A waveguide window comprising: a section of hollow waveguide adapted to transmit a wave which possesses a transverse electric field perpendicular to the direction of propagation of said wave; a first pane of dielectric possessing a first dielectric constant and a first pair of parallel surfaces spaced apart substantially an integral number of half-wavelengths of said wave disposed across an open cross-section of said waveguide with said first pair of parallel surfaces perpendicular to the direction of propagation of said wave; a second pane of dielectric possessing a second dielectric constant substantially lower than said first dielectric constant and a second pair of parallel surfaces spaced apart substantially an odd number of quarter-wavelengths of said wave disposed substantially across said open cross-section with one of said second pair of parallel surfaces adjacent one of said first pair of parallel surfaces; and a third pane of dielectric possessing a third dielectric constant substantially lower than said first dielectric constant and a third pair of parallel surfaces spaced apart substantially an odd number of quarter-wavelengths of said wave disposed substantially across said open cross-section with one of said third pair of parallel surfaces adjacent the other of said first pair of parallel surfaces.
Claim 4
Dependent Claim
201 words
A waveguide window comprising: a section of hollow waveguide adapted to transmit a wave which possesses a transverse electric field perpendicular to the direction of propagation of said wave; a first pane of dielectric possessing a first dielectric constant and a first pair of parallel surfaces spaced apart substantially an integral number of half-wavelengths of said wave disposed across an open cross-section of said waveguide with said first pair of parallel surfaces perpendicular to the direction of propagation of said wave; a second pane of dielectric possessing a second dielectric constant substantially lower than said first dielectric constant and a second pair of parallel surfaces spaced apart substantially an odd number of quarter-wavelengths of said wave disposed substantially across said open cross-section with one of said second pair of parallel surfaces adjacent one of said first pair of parallel surfaces; and a third pane of dielectric possessing a third dielectric constant substantially lower than said first dielectric constant and a third pair of parallel surfaces spaced apart substantially an odd number of quarter-wavelengths of said wave disposed substantially across said open cross-section with one of said third pair of parallel surfaces adjacent the other of said first pair of parallel surfaces.
Claim 5
Dependent Claim
24 words
The window of claim 2 wherein said second and third dielectric constants are substantially equal to the square root of said first dielectric constant.
Claim 6
Dependent Claim
12 words
The window of claim 2 wherein said wave has circular electric fields.
Claim 7
Dependent Claim
13 words
The waveguide of claim 2 wherein said first pane is largely aluminum oxide.
Claim 8
Dependent Claim
14 words
The waveguide of claim 5 wherein said second and third panes are fused silica.
Claim 9
Dependent Claim
27 words
The window of claim 2 wherein said first pane is hermetically sealed across waveguide and said second and third panes are not sealed to said first pane.
Claim 10
Dependent Claim
18 words
The window of claim 7 wherein said second and third panes are not hermetically sealed to said waveguide.
References Cited (Backward Citations)
US2411534A
Cited
US2958834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |