Patent US741419A successfully refreshed from Google Patents.
Patent US4051450A successfully refreshed from Google Patents.
US4051450A
Expired / Lapsed
US
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Waveguides
Assignee: National Research Development Corp UK
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Filing: 1976-04-01
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Granted: 1977-09-27
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Expires: 1996-04-01
Abstract
Abstract Waveguides for the dipole mode are described which are of rectangular cross-section with conductive walls and contain one or more longitudinal conductors, or groups of conductors. Where a plurality of conductors are employed they are usually arranged in planes parallel to one wall and are positioned nearer to this wall than the opposite wall. With one conductor or a group of conductors near one wall the dipole mode propagates principally between the conductor or conductors and the nearer wall while the evanescent part of the transverse field is allowed to decay substantially without interference before reaching the far wall.
Inventors
- 👤 Harold Everard Monteagle Barlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:47
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/12
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
86 words
Apparatus for supporting electromagnetic waves including a hollow dielectric filled member having generally planar inner conducting walls defining an elongated space of substantially constant cross-section, and at least one elongated conductor passing along the length of the space between and parallel to first and second facing walls, the conductor being positioned relatively near the first wall and relatively far from the second wall, and the apparatus being such that electromagnetic waves are able to propagate principally in the region between the conductor and the first wall.
Claim 2
Dependent Claim
86 words
Apparatus for supporting electromagnetic waves including a hollow dielectric filled member having generally planar inner conducting walls defining an elongated space of substantially constant cross-section, and at least one elongated conductor passing along the length of the space between and parallel to first and second facing walls, the conductor being positioned relatively near the first wall and relatively far from the second wall, and the apparatus being such that electromagnetic waves are able to propagate principally in the region between the conductor and the first wall.
Claim 3
Dependent Claim
50 words
Apparatus according to claim 1 wherein the minimum distance between the conductor and the second wall is such that in operation the amplitude of the electric field strength just outside the second wall is less than one twenty-fifth of the amplitude of the electric field strength at the said conductor.
Claim 4
Dependent Claim
33 words
Apparatus according to claim 2 wherein the hollow member has third and fourth facing inner walls and the said cross-section is rectangular, the conductor being equidistant from the said third and fourth walls.
Claim 5
Dependent Claim
28 words
Apparatus according to claim 3 wherein the distance from the second wall to the conductor is at least twice the distance from the first wall to the conductor.
Claim 6
Dependent Claim
35 words
Apparatus according to claim 2 wherein the hollow member has third and fourth facing inner walls, the said cross-section is rectangular, and wherein the said one conductor is one of a plurality of parallel conductors.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 5 wherein the conductors are circular in cross-section and their surfaces are spaced from one another at least by a distance equal to the diameter of one of the conductors.
Claim 8
Dependent Claim
19 words
Apparatus according to claim 5 wherein the conductors are positioned in a first plane parallel to the first wall.
Claim 9
Dependent Claim
27 words
Apparatus according to claim 7 including at least one group of further conductors positioned adjacent to the first plane in a further plane parallel to the first.
Claim 10
Dependent Claim
33 words
Apparatus according to claim 5 wherein the conductors are positioned in the surface of a first imaginary cylinder with axis parallel to the first wall and equidistant from the third and fourth walls.
Claim 11
Dependent Claim
30 words
Apparatus according to claim 9 including at least one group of further conductors positioned in the surface of a further imaginary cylinder adjacent to the first cylinder and concentric therewith.
Claim 12
Dependent Claim
46 words
Apparatus according to claim 3 including a further conductor so positioned parallel to the second wall and equidistant from the third and fourth walls that electromagnetic waves in the dipole mode are able to propagate principally in the region between the conductor and the second wall.
Claim 13
Dependent Claim
52 words
Apparatus according to claim 5 including a group of further conductors so positioned with each conductor parallel to the second wall and the third and fourth walls that electromagnetic waves in the dipole mode are able to propagate principally in the region between the second wall and the group of further conductors.
Claim 14
Dependent Claim
20 words
Apparatus according to claim 2 including means for launching or sensing waves in the dipole mode within the hollow member.
Claim 15
Dependent Claim
53 words
Apparatus according to claim 13 including a first coupling conductor extending generally at right angles through an aperture in the first wall towards the elongated conductor and a second coupling conductor connected to the first wall, the signal to be launched or sensed existing, in operation, between the first and second coupling conductors.
Claim 16
Dependent Claim
57 words
Apparatus according to claim 13 including a conducting end wall at one end of the hollow member generally transverse to the conductor, the end wall having an aperture through which the conductor passes, and the signal to be launched or sensed existing, in operation between the end wall and that conductor which passes through the end wall.
Claim 17
Dependent Claim
99 words
Apparatus according to claim 13 including a conducting end wall at one end of the hollow member, generally transverse to the conductor, the end wall having a narrow slot extending parallel to the first wall between the first wall and the elongated conductor, and means for exciting the slot to provide an electric field between the longitudinal edges thereof which is approximately the same sine distribution over the length of the slot as the dipole mode electric field is in the vicinity of the slot when propagation in the dipole mode occurs in the direction of the elongated conductor.
Claim 18
Dependent Claim
29 words
Apparatus according to claim 3 wherein the cross-sectional dimensions of the hollow member are outside dimensions substantially one inch by two inches, with a wall thickness of 0.064 inches.
Claim 19
Dependent Claim
43 words
Apparatus according to claim 3 for dipole mode propagation below a predetermined frequency wherein the distance between the first and second walls and the distance between the third and fourth walls is less than half the free space wavelength at the predetermined frequency.
Claim 20
Dependent Claim
19 words
A method of propagating electromagnetic waves, including propagating waves in the dipole mode in apparatus according to claim 3.
Claim 21
Dependent Claim
22 words
A method propagating electromagnetic waves, including launching or sensing, and propagating waves in the dipole mode using apparatus according to claim 13.
Claim 22
Dependent Claim
29 words
Apparatus according to claim 3, wherein the cross-sectional dimensions of the hollow member are: outside dimensions substantially 3/4 inch by 11/2 inches, with a wall thickness of 0.064 inches.
Claim 23
Dependent Claim
29 words
Apparatus according to claim 3 wherein the cross-sectional dimensions of the hollow member are: outside dimensions substantially 5/8 inch by 11/4 inches, with a wall thickness of 0.064 inches.
Claim 24
Dependent Claim
29 words
Apparatus according to claim 3 wherein the cross-sectional dimensions of the hollow member are: outside dimensions substantially 1/2 inch by 1 inch with a wall thickness of 0.05 inches.
Claim 25
Dependent Claim
95 words
Apparatus for supporting electromagnetic waves, including a hollow dielectric filled-member having two pairs of opposite conductive walls defining an elongate space which is rectangular in cross-section, first and second groups of spaced apart conductors in which the conductors of the groups are parallel to one pair of opposite walls, and define a sub-region of the space bounded by the conductors of the first group, the conductors of the second group and the two other opposite walls, the apparatus being such that electromagnetic waves in the dipole mode are able to propagate principally in the sub-region.
Claim 26
Dependent Claim
95 words
Apparatus for supporting electromagnetic waves, including a hollow dielectric filled-member having two pairs of opposite conductive walls defining an elongate space which is rectangular in cross-section, first and second groups of spaced apart conductors in which the conductors of the groups are parallel to one pair of opposite walls, and define a sub-region of the space bounded by the conductors of the first group, the conductors of the second group and the two other opposite walls, the apparatus being such that electromagnetic waves in the dipole mode are able to propagate principally in the sub-region.
Claim 27
Dependent Claim
63 words
Apparatus according to clam 24 wherein the first and second groups of conductors are positioned in planes parallel to the said one pair of opposite walls, and each wall of said one pair is positioned far enough from the nearer said parallel plane not to cause substantial interference with the evanescent field which appears between that wall and the said nearer parallel plane.
Claim 28
Dependent Claim
63 words
Apparatus according to clam 24 wherein the first and second groups of conductors are positioned in planes parallel to the said one pair of opposite walls, and each wall of said one pair is positioned far enough from the nearer said parallel plane not to cause substantial interference with the evanescent field which appears between that wall and the said nearer parallel plane.
Claim 29
Dependent Claim
92 words
Apparatus for supporting electromagnetic waves, including a hollow dielectric filled member with an inner conducting surface defining an elongated space of substantially constant cross-section, and at least one elongated conductor passing along the length of the space parallel to the conducting surface between first and second facing portions of the surface, the conductor being positioned relatively near the first portion and relatively far from the second portion, and the apparatus being such that electromagnetic waves are able to propagate along the space, mainly in the region between the conductor and first portion.
Claim 30
Dependent Claim
92 words
Apparatus for supporting electromagnetic waves, including a hollow dielectric filled member with an inner conducting surface defining an elongated space of substantially constant cross-section, and at least one elongated conductor passing along the length of the space parallel to the conducting surface between first and second facing portions of the surface, the conductor being positioned relatively near the first portion and relatively far from the second portion, and the apparatus being such that electromagnetic waves are able to propagate along the space, mainly in the region between the conductor and first portion.
References Cited (Backward Citations)
US3668574A
Cited
US3772619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |