US3613034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide structure with pseudocavity region for constraining pump and idler energies
Assignee: Boeing North American Inc
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Filing: 1969-08-14
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Granted: 1971-10-12
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Expires: 1989-08-14
Abstract
Abstract A noel waveguide structure usable in a broadband microwave parametric amplifier is described which comprises a rectangular waveguide with a pair of substantially U-shaped channels extending oppositely from the top and bottom of the waveguide to a depth of 1/4 guide wavelength at the lower idler frequency. The channels define a pseudocavity region in the waveguide, within which region the idler and pump energy is constrained and parametric interaction occurs. The waveguide is of sufficient width to allow propagation of a signal in the lowest order transverse electric mode and contains a varactor diode as a nonlinear reactance to couple pump energy at a high frequency to a signal at a much lower frequency.
Inventors
- 👤 James N Linnd
- 👤 William E Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:32
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04; H01; H01P; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A rectangular waveguide having means for constraining energy at a given frequency to within a region of said waveguide, said means comprising at least one channel extending orthogonally from a wider wall of said waveguide to a depth of essentially one-quarter guide wavelength of said frequency, said channel being substantially U-shaped and comprising an end section and first and second side grooves, said channel forming a pseudocavity capable of supporting a mode of electrical signals at a frequency different from that of at least another mode supportable in said waveguide.
Claim 2
Dependent Claim
90 words
A rectangular waveguide having means for constraining energy at a given frequency to within a region of said waveguide, said means comprising at least one channel extending orthogonally from a wider wall of said waveguide to a depth of essentially one-quarter guide wavelength of said frequency, said channel being substantially U-shaped and comprising an end section and first and second side grooves, said channel forming a pseudocavity capable of supporting a mode of electrical signals at a frequency different from that of at least another mode supportable in said waveguide.
Claim 3
Dependent Claim
36 words
The structure as defined in claim 1 wherein a second end section is included at the open end of said grooves of said channel to form a substantially rectangular-shaped channel which defines a rectangular pseudocavity region.
Claim 4
Dependent Claim
107 words
In a waveguide having a lowest propagation frequency, means for constraining energy having a second frequency higher than said lowest propagation frequency to within a pseudocavity region of said waveguide, said means comprising, two channels extending oppositely one from the other from the top and bottom of said waveguide to a depth of essentially one-quarter guide wavelength of said second frequencY, said channels being substantially U-shaped and comprising an end section and first and second side grooves wherein the thickness of said end section and said side grooves measured in the plane of attachment to said waveguide is no greater than one-half the depth of said channels.
Claim 5
Dependent Claim
107 words
In a waveguide having a lowest propagation frequency, means for constraining energy having a second frequency higher than said lowest propagation frequency to within a pseudocavity region of said waveguide, said means comprising, two channels extending oppositely one from the other from the top and bottom of said waveguide to a depth of essentially one-quarter guide wavelength of said second frequencY, said channels being substantially U-shaped and comprising an end section and first and second side grooves wherein the thickness of said end section and said side grooves measured in the plane of attachment to said waveguide is no greater than one-half the depth of said channels.
Claim 6
Dependent Claim
84 words
A structure as defined in claim 3 wherein the width of said pseudocavity region is an integral number of one-half guide wavelengths at said second frequency, and the length of said pseudocavity region is an integral number of one-half guide wavelengths plus one-quarter guide wavelengths at said second frequency, said width being the distance between said side grooves of said U-shaped channels and said length being the distance from the open end of a side groove to the remote side of the end section.
Claim 7
Dependent Claim
38 words
A structure as defined in claim 3 wherein one end of said waveguide is short circuit terminated, wherein said channels are substantially U-shaped, and wherein said terminated end of said waveguide provides one boundary of said pseudocavity region.
Claim 8
Dependent Claim
42 words
A structure as defined in claim 5 further comprising means for introducing energy into said pseudocavity region, said means comprising a second waveguide extending from said terminated end of said waveguide and having a cutoff frequency higher than said lowest propagation frequency.
Claim 9
Dependent Claim
22 words
A structure as defined in claim 5 wherein the thickness of said channels is approximately one-tenth guide wavelength at said second frequency.
Claim 10
Dependent Claim
35 words
A structure as defined in claim 7 wherein said pseudocavity region has a width of one guide wavelength at said second frequency, and a length of one and one-quarter guide wavelength at said second frequency.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |