US3728650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ghost-mode shifted dielectric window
Assignee: Raytheon Co
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Filing: 1971-07-23
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Granted: 1973-04-17
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Expires: 1991-07-23
Abstract
Abstract The invention discloses a dielectric window serving as an interface between different atmospheric media and/or propagating structures incorporating means for detuning ghost-modes to frequencies outside of a desired tuning range. The window is provided with a thicker cross-sectional interface of a compatible dielectric material principally disposed in the diametrically spaced regions of zero electric field intensity of the normal resonant frequency resonant mode. Crossed field devices having tunable coaxial cavity resonators employ the applicable structures in the output energy coupling section. Dielectric materials such as alumina ceramic or beryllium oxide provide high peak power handling capability for devices employing the disclosed window.
Inventors
- 👤 R Forman
- 👤 R Dame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:45
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
52 words
A microwave dielectric window comprising: a member of a material permeable to electromagnetic energy having electric and magnetic field distributions in a predetermined normal resonant frequency operating mode; said member having a thicker cross section principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode.
Claim 2
Dependent Claim
52 words
A microwave dielectric window comprising: a member of a material permeable to electromagnetic energy having electric and magnetic field distributions in a predetermined normal resonant frequency operating mode; said member having a thicker cross section principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode.
Claim 3
Dependent Claim
26 words
A window as set forth in claim 1 wherein said thicker regions are in the order of at least twice the thickness of the remaining regions.
Claim 4
Dependent Claim
13 words
A window as set forth in claim 1 wherein said member is circular.
Claim 5
Dependent Claim
16 words
A window as set forth in claim 1 wherein said thicker regions have a button-shaped configuration.
Claim 6
Dependent Claim
16 words
A window as set forth in claim 1 wherein said thicker regions have a step configuration.
Claim 7
Dependent Claim
71 words
A microwave dielectric window comprising: a member of a dielectric material having a high dielectric constant value for propagating electromagnetic energy having electric and magnetic field distributions in a predetermined normal resonant frequency operating mode disposed between media having different atmospheric pressures; said member having additional dielectric material disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode and facing the lower pressure media side.
Claim 8
Dependent Claim
71 words
A microwave dielectric window comprising: a member of a dielectric material having a high dielectric constant value for propagating electromagnetic energy having electric and magnetic field distributions in a predetermined normal resonant frequency operating mode disposed between media having different atmospheric pressures; said member having additional dielectric material disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode and facing the lower pressure media side.
Claim 9
Dependent Claim
14 words
A window as set forth in claim 6 wherein said material comprises beryllium oxide.
Claim 10
Dependent Claim
14 words
A window as set forth in claim 6 wherein said material comprises alumina ceramic.
Claim 11
Dependent Claim
20 words
A window as set forth in claim 6 wherein said material has a dielectric constant value in excess of 3.0.
Claim 12
Dependent Claim
72 words
A microwave dielectric window comprising: a member of a dielectric material for propagating electromagnetic energy having electric and magnetic field distributions in a predetermined normal resonant frequency operating mode between a section of hollow circular waveguide and a section of hollow rectangular waveguide; said member having additional dielectric material principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode and facing the circular waveguide section.
Claim 13
Dependent Claim
72 words
A microwave dielectric window comprising: a member of a dielectric material for propagating electromagnetic energy having electric and magnetic field distributions in a predetermined normal resonant frequency operating mode between a section of hollow circular waveguide and a section of hollow rectangular waveguide; said member having additional dielectric material principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode and facing the circular waveguide section.
Claim 14
Dependent Claim
23 words
A window as set forth in claim 10 wherein said member has the same diameter as the inner diameter of said circular waveguide.
Claim 15
Dependent Claim
90 words
A microwave dielectric window for tunable electromagnetic energy devices Comprising: a dielectric member permeable to such energy and capable of exciting plural modes having determinable electric and magnetic field distributions over a selected tuning range; and means for shifting the boundary conditions of specific definitive modes outside the tuning range of a predetermined normal resonant frequency operating mode; said means comprising enlargement of the cross section of the dielectric member principally only in the diametrically spaced regions of zero electric field intensity of said operating mode with compatible dielectric material.
Claim 16
Dependent Claim
90 words
A microwave dielectric window for tunable electromagnetic energy devices Comprising: a dielectric member permeable to such energy and capable of exciting plural modes having determinable electric and magnetic field distributions over a selected tuning range; and means for shifting the boundary conditions of specific definitive modes outside the tuning range of a predetermined normal resonant frequency operating mode; said means comprising enlargement of the cross section of the dielectric member principally only in the diametrically spaced regions of zero electric field intensity of said operating mode with compatible dielectric material.
Claim 17
Dependent Claim
79 words
A broad frequency band microwave dielectric window having controlled ghost-mode resonances comprising: a member of a dielectric material serving as a boundary interface between means for propagating electromagnetic energy with electric and magnetic field distributions in normal resonant frequency operating and ghost-modes; and means for detuning certain ghost-mode resonances comprising an enlargement of the cross-sectional interfaced dimensions with a compatible dielectric material principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode.
Claim 18
Dependent Claim
79 words
A broad frequency band microwave dielectric window having controlled ghost-mode resonances comprising: a member of a dielectric material serving as a boundary interface between means for propagating electromagnetic energy with electric and magnetic field distributions in normal resonant frequency operating and ghost-modes; and means for detuning certain ghost-mode resonances comprising an enlargement of the cross-sectional interfaced dimensions with a compatible dielectric material principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode.
Claim 19
Dependent Claim
108 words
A crossed field device comprising: a cathode member; a resonant system having a plurality of cavity resonators defined by anode members supported by a boundary wall surrounding said cathode member to generate electromagnetic energy; means including said boundary wall defining a coaxial cavity resonator adapted to be resonant in a predetermined normal electric and magnetic field operating mode orientation and communicate with said anode-cathode cavity resonators; means for coupling said energy from said coaxial cavity resonator; said coupling means including an energy permeable dielectric window member having a thicker cross section principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode.
Claim 20
Dependent Claim
108 words
A crossed field device comprising: a cathode member; a resonant system having a plurality of cavity resonators defined by anode members supported by a boundary wall surrounding said cathode member to generate electromagnetic energy; means including said boundary wall defining a coaxial cavity resonator adapted to be resonant in a predetermined normal electric and magnetic field operating mode orientation and communicate with said anode-cathode cavity resonators; means for coupling said energy from said coaxial cavity resonator; said coupling means including an energy permeable dielectric window member having a thicker cross section principally disposed only in the diametrically spaced regions of zero electric field intensity of said operating mode.
Claim 21
Dependent Claim
22 words
A device as set forth in claim 14 wherein said dielectric window member is disposed within a section of hollow circular waveguide.
Claim 22
Dependent Claim
20 words
A device as set forth in claim 14 wherein said thicker cross section regions are defined by spaced button-shaped bodies.
References Cited (Backward Citations)
GB635000A
Cited
GB733655A
Cited
US2854603A
Cited
US3082351A
Cited
US3163835A
Cited
US3339102A
Cited
US3594667A
Cited
US3593224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |