Patent US3609675A successfully refreshed from Google Patents.
US3609675A
Expired / Lapsed
US
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Microwave communication system for moving land vehicle
Assignee: GEN APPLIED SCIENCE LAB Inc
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Filing: 1969-03-03
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Granted: 1971-09-28
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Expires: 1989-03-03
Abstract
Abstract The microwave communication system, in its preferred form, includes a stationary waveguide through which microwave energy flows in surface waves in the fundamental mode. The waveguide preferably is a semicylindrical dielectric rod with a metallic conducting shield on the flat surface of the rod, and with the remainder of the rod unshielded. An antenna having the same general guide configuration is positioned near the waveguide to transmit and receive communications to and from the waveguide. The antenna either is stationary or is mounted on a vehicle such as a railroad car and positioned so as to always be near the waveguide. One form of antenna actually comprises a novel directional coupler, and another is a resonant antenna. In the waveguide fabrication method, the pattern of the lines of force of the electrical field in an unshielded waveguide of a given shape is determined, and a plane perpendicular to the lines is located. A waveguide is formed with the original shape but cut away along the perpendicular plane. Then a conductive shield is located at the resulting surface.
Inventors
- 👤 Manlio G Abele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:02
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/24; H01P; H01P3/00; H01P3/12; H01P3/123; H01P5/00; H01P5/02; H01P5/022; H01P5/024; H01P5/12; H01P5/16; H01P5/18; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/3208; H01Q1/3225
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
97 words
An antenna for a microwave transmission system, said antenna comprising a length of dielectric waveguide structure, a conductive shield on only a portion of the perimeter of said waveguide structure, said shield being substantially perpendicular to the lines of force of the electric field traveling in said waveguide structure in a predetermined mode, the length of said waveguide structure being equal to an integral number of half-wavelengths of the microwave energy being transmitted, and reflective termination means at each end of said antenna, one of said reflective terminations having a window providing an exit for microwave energy.
Claim 2
Dependent Claim
97 words
An antenna for a microwave transmission system, said antenna comprising a length of dielectric waveguide structure, a conductive shield on only a portion of the perimeter of said waveguide structure, said shield being substantially perpendicular to the lines of force of the electric field traveling in said waveguide structure in a predetermined mode, the length of said waveguide structure being equal to an integral number of half-wavelengths of the microwave energy being transmitted, and reflective termination means at each end of said antenna, one of said reflective terminations having a window providing an exit for microwave energy.
Claim 3
Dependent Claim
14 words
Apparatus as in claim 1 in which said waveguide structure is a semicylindrical rod.
Claim 4
Dependent Claim
47 words
Apparatus as in claim 1 in which said waveguide structure is a semicylindrical rod of dielectric material, and said shield has a web portion secured to the flat portion of said rod, and a pair of flanges extending from said web at positions spaced from said rod.
Claim 5
Independent Claim
127 words
A system for communicating with a moving land vehicle, said system comprising, in combination, a vehicle capable of moving on a track on the ground, a stationary waveguide positioned along said track, said waveguide including semicylindrical dielectric waveguide means for guiding microwave electromagnetic energy at a phase velocity less than the speed of light, and a conductive shield on only a portion of the perimeter of said waveguide means, said shield extending along a diameter of the full cylinder of which said waveguide means in a part, an antenna mounted on said vehicle in a portion in which it is adjacent the unshielded portion of said waveguide to receive signals therefrom, and means for generating and sending said microwave energy through said waveguide in the HE11 mode.
Claim 6
Independent Claim
127 words
A system for communicating with a moving land vehicle, said system comprising, in combination, a vehicle capable of moving on a track on the ground, a stationary waveguide positioned along said track, said waveguide including semicylindrical dielectric waveguide means for guiding microwave electromagnetic energy at a phase velocity less than the speed of light, and a conductive shield on only a portion of the perimeter of said waveguide means, said shield extending along a diameter of the full cylinder of which said waveguide means in a part, an antenna mounted on said vehicle in a portion in which it is adjacent the unshielded portion of said waveguide to receive signals therefrom, and means for generating and sending said microwave energy through said waveguide in the HE11 mode.
Claim 7
Dependent Claim
42 words
Apparatus as in claim 4 in which said antenna is mounted adjacent the undercarriage of said vehicle and said stationary waveguide is located at a height so as to be closely adjacent said antenna when said vehicle is traveling on said track.
Claim 8
Dependent Claim
22 words
Apparatus as in claim 4 in which said stationary waveguide faces generally downwardly and saiD shield is above and covers said waveguide.
Claim 9
Dependent Claim
21 words
Apparatus as in claim 4 including a transmitter and receiver on said vehicle and adapted to be connected to said antenna.
Claim 10
Dependent Claim
28 words
Apparatus as in claim 4 in which said waveguide means includes a semicylindrical rod of dielectric material, said shield being positioned on the flat surface of said rod.
Claim 11
Dependent Claim
40 words
Apparatus as in claim 8 in which said shield is U-shaped with said rod being secured to the web between the arms of the U, and a plurality of supports connected to the shield on the outside of the U.
Claim 12
Dependent Claim
26 words
Apparatus as in claim 8 in which the guide portion of said antenna has substantially the same construction as the guide portion of said stationary waveguide.
Claim 13
Dependent Claim
131 words
In a system for communication with a movable body, elongated stationary semicylindrical dielectric waveguide means for guiding microwave electromagnetic energy at a phase velocity less than the speed of light in air, means for generating and sending said microwave energy through said waveguide means in the HE11 mode, a conductive shield on only a portion of the perimeter of said waveguide means, said shield extending along a diameter of the full cylinder of which said waveguide means is a part, a portion of said waveguide means being unshielded, microwave signal coupling means movably positioned adjacent the unshielded portion of said waveguide means and adapted to move in the longitudinal direction in spaced apart relationship to said stationary waveguide means, and to couple microwave signals to and from said stationary waveguide means.
Claim 14
Dependent Claim
131 words
In a system for communication with a movable body, elongated stationary semicylindrical dielectric waveguide means for guiding microwave electromagnetic energy at a phase velocity less than the speed of light in air, means for generating and sending said microwave energy through said waveguide means in the HE11 mode, a conductive shield on only a portion of the perimeter of said waveguide means, said shield extending along a diameter of the full cylinder of which said waveguide means is a part, a portion of said waveguide means being unshielded, microwave signal coupling means movably positioned adjacent the unshielded portion of said waveguide means and adapted to move in the longitudinal direction in spaced apart relationship to said stationary waveguide means, and to couple microwave signals to and from said stationary waveguide means.
Claim 15
Dependent Claim
15 words
Apparatus as in claim 11 including receiving and transmitting means connected to said coupling means.
Claim 16
Dependent Claim
29 words
A system as in claim 11 in which the coupling means is a length of waveguide structure having substantially the same shape as that of said stationary waveguide means.
Claim 17
Dependent Claim
25 words
A system as in claim 11 in which the ratio of the speed of light to said phase velocity is approximately from 1.01 to 1.05.
Claim 18
Dependent Claim
37 words
Apparatus as in claim 11 including a waveguide structure in said coupling means, said waveguide structure having an effective length which is more than 10 times as long as the wavelength of the microwave energy being transmitted.
Claim 19
Dependent Claim
25 words
Apparatus as in claim 11 in which said unshielded portion of said stationary waveguide means faces generally downwardly, with said shield covering said waveguide means.
Claim 20
Dependent Claim
29 words
Apparatus as in claim 16 including a plurality of support structures for supporting said waveguide means above the ground, and means for fastening said shield to said support structures.
Claim 21
Dependent Claim
59 words
Apparatus as in claim 11 in which said signal coupling means has a partially shielded waveguide structure substantially identical to that of said stationary waveguide means, and means secured to the shield of said coupling means to hold it in a position such that the unshielded portion of the antenna waveguide structure faces that of the first-named waveguide structure.
Claim 22
Dependent Claim
29 words
Apparatus as in claim 18 in which said waveguide structure in said coupling means has a microwave absorber at one end, and microwave detector means at the other end.
Claim 23
Dependent Claim
97 words
In a microwave communication system, a stationary microwave guide comprising a semicylindrical dielectric guide member with an electrically conductive member on the surface of said guide member extending along a diameter of the full cylinder of which said member is a part, means for generating and sending said microwave energy through said guide member in the HE11 mode, a coupler positioned to move approximately parallel to said stationary guide at a distance therefrom to couple microwave signals to and from said stationary guide, said coupler being a waveguide having substantially the same shape as said stationary waveguide.
Claim 24
Dependent Claim
97 words
In a microwave communication system, a stationary microwave guide comprising a semicylindrical dielectric guide member with an electrically conductive member on the surface of said guide member extending along a diameter of the full cylinder of which said member is a part, means for generating and sending said microwave energy through said guide member in the HE11 mode, a coupler positioned to move approximately parallel to said stationary guide at a distance therefrom to couple microwave signals to and from said stationary guide, said coupler being a waveguide having substantially the same shape as said stationary waveguide.
Claim 25
Dependent Claim
34 words
A system as in claim 20 in which the waveguide of said coupler has an effective length which is more than 10 times as long as the wavelength of the microwave energy being transmitted.
Claim 26
Dependent Claim
38 words
A sYstem as in claim 20 in which said electrically conductive member comprises a shield which covers said dielectric guide member, and including support members fastened to said conductive member to support said guide above a support surface.
Claim 27
Dependent Claim
15 words
A system as in claim 22 in which said shield has, substantially, an inverted U-shape.
Claim 28
Dependent Claim
199 words
In a microwave energy transmission system, elongated waveguide means for guiding microwave electromagnetic energy at a phase velocity less than the speed of light in air, a conductive shield on only a portion of the perimeter of said waveguide means, said shield being substantially perpendicular to the lines of force of the electrical field in said waveguide means when conducting microwave energy in a predetermined mode, a plurality of support structures for supporting said waveguide means above the ground and means for fastening said shield to said support structures, antenna means adjacent the unshielded portion of said waveguide means, said antenna means having a partially shielded waveguide structure substantially identical to that of the transmission system, and means secured to the shield of said antenna means to hold it in a position such that the unshielded portion of the antenna waveguide structure faces that of the first-named waveguide structure, said waveguide structure of said antenna having a length which is an integral multiple of half-wavelengths of the energy being transmitted, a pair of microwave reflectors at the ends of the antenna with an aperture in one reflector, and means for guiding energy out of said antenna through said aperture.
Claim 29
Dependent Claim
199 words
In a microwave energy transmission system, elongated waveguide means for guiding microwave electromagnetic energy at a phase velocity less than the speed of light in air, a conductive shield on only a portion of the perimeter of said waveguide means, said shield being substantially perpendicular to the lines of force of the electrical field in said waveguide means when conducting microwave energy in a predetermined mode, a plurality of support structures for supporting said waveguide means above the ground and means for fastening said shield to said support structures, antenna means adjacent the unshielded portion of said waveguide means, said antenna means having a partially shielded waveguide structure substantially identical to that of the transmission system, and means secured to the shield of said antenna means to hold it in a position such that the unshielded portion of the antenna waveguide structure faces that of the first-named waveguide structure, said waveguide structure of said antenna having a length which is an integral multiple of half-wavelengths of the energy being transmitted, a pair of microwave reflectors at the ends of the antenna with an aperture in one reflector, and means for guiding energy out of said antenna through said aperture.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |