US3569871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide taper of minimum length
Assignee: General Electric Co
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Filing: 1968-08-22
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Granted: 1971-03-09
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Expires: 1988-08-22
Abstract
Abstract A low-cost waveguide taper for interconnecting two circular waveguides which differ substantially in size is constructed from a plurality of reinforced, thin-walled conical sections having predetermined taper angles and axial lengths to minimize the effects of spurious modes generated at the junctions of the conical sections.
Inventors
- 👤 Kiyo Tomiyasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:15
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02; H01P5/022; H01P5/024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
A waveguide taper of minimum length for interconnecting two circular waveguides differing substantially in diameter size comprising: 12 conical waveguide sections connected in order of increasing diameters, said sections having selected axial lengths and four different taper angles for minimizing the generation of spurious modes at the junctions of different taper angles, the larger diameter conical sections comprising thin-wall members; pairs of alternate junctions being interlaced and the junctions of each pair being pi radians apart in terms of the beat wavelength of a dominant and spurious mode of propagation to thereby substantially cancel the effect oF the spurious mode and provide a waveguide taper of length substantially shorter than a waveguide taper having a continuously variable taper wherein both waveguide tapers are adapted for propagating the same dominant mode at the same frequency and having comparable electrical characteristics; and the four sections of largest diameter have a first common taper angle, the next three sections have a second common taper angle, the next two sections have a third common taper angle, and the three smallest diameter sections have a fourth common taper angle.
Claim 2
Dependent Claim
184 words
A waveguide taper of minimum length for interconnecting two circular waveguides differing substantially in diameter size comprising: 12 conical waveguide sections connected in order of increasing diameters, said sections having selected axial lengths and four different taper angles for minimizing the generation of spurious modes at the junctions of different taper angles, the larger diameter conical sections comprising thin-wall members; pairs of alternate junctions being interlaced and the junctions of each pair being pi radians apart in terms of the beat wavelength of a dominant and spurious mode of propagation to thereby substantially cancel the effect oF the spurious mode and provide a waveguide taper of length substantially shorter than a waveguide taper having a continuously variable taper wherein both waveguide tapers are adapted for propagating the same dominant mode at the same frequency and having comparable electrical characteristics; and the four sections of largest diameter have a first common taper angle, the next three sections have a second common taper angle, the next two sections have a third common taper angle, and the three smallest diameter sections have a fourth common taper angle.
Claim 3
Dependent Claim
47 words
The waveguide taper of minimum length set forth in claim 1 wherein the smallest diameter section has a continuously variable taper angle terminating in the fourth common taper angle whereby four junctions of different taper angles are provided to form two interlaced pairs of the alternate junctions.
Claim 4
Dependent Claim
79 words
The waveguide taper of minimum length set forth in claim 2 wherein: said waveguide taper has minimum and maximum inside diameters of 2.250 and 29.700 inches, respectively; and said waveguide taper has a total length of 208 inches which is substantially shorter than a comparable continuously variable taper having similar electrical characteristics and a minimum total length of 30 feet wherein the waveguide tapers are adapted for propagating the TE01 mode at X-band frequency with negligible mode conversion losses.
Claim 5
Dependent Claim
43 words
The waveguide taper of minimum length set forth in claim 3 wherein the first common taper is 1* 23.5'', the second common taper angle is 2* 59'', the third common taper angle is 5*, and the fourth common taper angle is 7* 44.2''.
Claim 6
Dependent Claim
50 words
The waveguide taper minimum length set forth in claim 4 wherein the four sections of largest diameter each have an axial length of 19.307 inches, the next three sections each have an axial length of 17.750 inches, and the next two sections each have an axial length of 15.145 inches.
Claim 7
Dependent Claim
39 words
The waveguide taper of minimum length set forth in claim 5 wherein the five sections of largest diameter each have a wall thickness of 0.040 inch and the next four sections each have a wall thickness of 0.032 inch.
Claim 8
Dependent Claim
140 words
A waveguide taper of minimum length for interconnecting two circular waveguides differing substantially in diameter size comprising: 12 conical waveguide sections connected in order of increasing diameters, said sections having selected axial lengths and four different taper angles for minimizing the generation of spurious modes at the junctions of different taper angles, the larger diameter conical sections comprising thin-wall members; and pairs of alternate junctions being interlaced and the junctions of each pair being pi radians apart in terms of the beat wavelength of a dominant and spurious mode of propagation to thereby substantially cancel the effects of the spurious mode and provide a waveguide taper of length substantially shorter than a waveguide taper having a continuously variable taper wherein both waveguide tapers are adapted for propagating the same dominant mode at the same frequency and having comparable electrical characteristics.
Claim 9
Dependent Claim
140 words
A waveguide taper of minimum length for interconnecting two circular waveguides differing substantially in diameter size comprising: 12 conical waveguide sections connected in order of increasing diameters, said sections having selected axial lengths and four different taper angles for minimizing the generation of spurious modes at the junctions of different taper angles, the larger diameter conical sections comprising thin-wall members; and pairs of alternate junctions being interlaced and the junctions of each pair being pi radians apart in terms of the beat wavelength of a dominant and spurious mode of propagation to thereby substantially cancel the effects of the spurious mode and provide a waveguide taper of length substantially shorter than a waveguide taper having a continuously variable taper wherein both waveguide tapers are adapted for propagating the same dominant mode at the same frequency and having comparable electrical characteristics.
References Cited (Backward Citations)
US3050701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |