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Patent US4358744A successfully refreshed from Google Patents.
US4358744A
Expired / Lapsed
US
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Impedance matched dielectric window
Assignee: Thales SA
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Filing: 1980-12-12
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Granted: 1982-11-09
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Expires: 2000-12-12
Abstract
Abstract The microwave window is inserted in a rectangular waveguide and is constituted by a half-wave impedance transformer, the wavelength considered being such as to correspond to the central frequency F 0 for which the window has been realized; a dielectric plate of small thickness is mounted above the transformer and two inductive shutters are located on each side of the plate. The dimensions of the window components are so determined that in the case of a matched waveguide, the standing-wave ratio of the window is substantially 1 in a frequency band of at least 35% of the central frequency around the central frequency.
Inventors
- 👤 Jacques Tikes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:49
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
A microwave window in a microwave device, wherein said window comprises: a half-wave impedance transformer, whose wavelength corresponds to the central frequency of the window; the remainder of the window being constituted by at least one inductive shutter and one dielectric plate, said dielectric plate having a small thickness substantially equal to the thickness of said shutter, said inductive shutter and said dielectric plate being mounted above the half-wave transformer at its middle and the assembly constituted by said transformer surmounted by said plate and said shutter closing the microwave device hermetically; the dimensions of the window being so determined that in the case of a matched microwave device, the standing-wave ratio of the window is substantially equal to one in a frequency band of at least 35% of the central frequency.
Claim 2
Dependent Claim
132 words
A microwave window in a microwave device, wherein said window comprises: a half-wave impedance transformer, whose wavelength corresponds to the central frequency of the window; the remainder of the window being constituted by at least one inductive shutter and one dielectric plate, said dielectric plate having a small thickness substantially equal to the thickness of said shutter, said inductive shutter and said dielectric plate being mounted above the half-wave transformer at its middle and the assembly constituted by said transformer surmounted by said plate and said shutter closing the microwave device hermetically; the dimensions of the window being so determined that in the case of a matched microwave device, the standing-wave ratio of the window is substantially equal to one in a frequency band of at least 35% of the central frequency.
Claim 3
Dependent Claim
25 words
A window according to claim 1, wherein said window is constituted by two inductive shutters which are located on each side of said dielectric plate.
Claim 4
Dependent Claim
13 words
A window according to claim 2, wherein the two shutters have equal dimensions.
Claim 5
Dependent Claim
38 words
A window according to claim 1 wherein said window is formed by brazing a strip of copper of small thickness both to the dielectric plate of ceramic material and to a molybdenum band which constitutes the inductive shutter.
Claim 6
Dependent Claim
30 words
A window according to claim 1 wherein the inductive shutter is formed by a metallic deposit partly covering at least one face of the dielectric plate which constitutes the window.
Claim 7
Dependent Claim
36 words
A window according to claim 1, wherein the half-wave transformer has a discontinuity in the central portion thereof and wherein the inductive shutter and the dielectric plate rest directly on the walls of the microwave device.
Claim 8
Dependent Claim
18 words
A microwave window according to claim 1 wherein the microwave device comprises a waveguide having any desired section.
Claim 9
Dependent Claim
35 words
A waveguide according to claim 7, wherein the window is brazed to the junction of two half-waveguides whilst said half-waveguides are brazed together at the same time, each half-waveguide being already provided with a half-transformer.
Claim 10
Dependent Claim
40 words
A microwave window according to claim 7, wherein the waveguide has a rectangular section and the half-wave transformer is fabricated from a metallic plate which covers at least one of the broad sides of the waveguide over about the half-wavelength.
Claim 11
Dependent Claim
37 words
A microwave window according to claim 7, wherein the waveguide has a rectangular section and the half-wave transformer is fabricated by reducing the height of the waveguide over about the half-wavelength, with respect to the longitudinal midplane.
Claim 12
Dependent Claim
22 words
A microwave window according to claim 10, wherein the height of the waveguide is reduced symmetrically with respect to the longitudinal midplane.
References Cited (Backward Citations)
US3439296A
Cited
US3593224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |