US3659094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving object communication systems
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1970-03-31
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Granted: 1972-04-25
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Expires: 1990-03-31
Abstract
Abstract Radio interference of a moving object communication system, wherein radio communication is between ground stations and a moving object such as a train, with other communication systems which is caused by the electromagnetic coupling between a leaky waveguide and an antenna aboard the moving object, is greatly reduced by providing a ground structure supporting the leaky waveguide in such a way that a narrow space or channel is left between the ground structure and the body of the moving object adjacent the direct coupling space between the line and the antenna. An electromagnetic wave absorbing substance is provided in this narrow space or channel and further the channel is preferebly additionally provided with corners in order to attenuate unwanted interference with other communication systems.
Inventors
- 👤 Tsuneo Nakahara
- 👤 Noritaka Kurauchi
- 👤 Hiroshi Kitani
- 👤 Kenji Takemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:07
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/20; H04B5/28; H01; H01Q; H01Q13/00; H01Q13/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
A communication coupling system for a moving vehicle following a predetermined path, comprising a support structure following said path and supporting a continuous open-type transmission line therealong spaced adjacent to an antenna mounted on a vehicle on said path for movement thereover and continuously providing an electromagnetic coupling space between said line and said antenna while said vehicle is in motion, said support means providing a continuous reflective or semielectromagnetic wave absorbing surface behind said transmission line opposite to said coupling space, the surfaces of said support structure and said vehicle defining a closely spaced channel region therebetween of significant width and at least coextensive with said antenna on at least one side of said electromagnetic coupling space, at least one of the surfaces in said channel region including electromagnetic wave absorbing material to attenuate electromagnetic waves passing through said channel region.
Claim 2
Dependent Claim
142 words
A communication coupling system for a moving vehicle following a predetermined path, comprising a support structure following said path and supporting a continuous open-type transmission line therealong spaced adjacent to an antenna mounted on a vehicle on said path for movement thereover and continuously providing an electromagnetic coupling space between said line and said antenna while said vehicle is in motion, said support means providing a continuous reflective or semielectromagnetic wave absorbing surface behind said transmission line opposite to said coupling space, the surfaces of said support structure and said vehicle defining a closely spaced channel region therebetween of significant width and at least coextensive with said antenna on at least one side of said electromagnetic coupling space, at least one of the surfaces in said channel region including electromagnetic wave absorbing material to attenuate electromagnetic waves passing through said channel region.
Claim 3
Dependent Claim
36 words
The communication coupling system of claim 1 wherein said channel region spacing is maintained to be no greater than approximately eight wavelengths of the electromagnetic wave in use for coupling between said line and said antenna.
Claim 4
Dependent Claim
21 words
The communication coupling system of claim 2 characterized in that said closely spaced channel region passes through at least one corner.
Claim 5
Dependent Claim
20 words
The communication system of claim 2 wherein both of the opposed surfaces of said channel include electromagnetic wave absorbing properties.
Claim 6
Dependent Claim
36 words
The communication coupling system of claim 2 wherein said channel region extends from both sides of said coupling region between said support structure and said vehicle to attenuate all electromagnetic waves escaping from said coupling space.
Claim 7
Dependent Claim
29 words
The communication system of claim 2 wherein said wave absorbing means is capable of attenuation of said electromagnetic waves passing through said channel region of more than 10 Db.
Claim 8
Dependent Claim
41 words
The communication system of claim 1 wherein only one of said channel surfaces has electromagnetic wave absorbing properties and the spacing between said surfaces of said channel region is maintained at no more than four wavelengths of the wavelength in use.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |