US3680146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna system with ferrite radiation suppressors mounted on feed line
Assignee: Jerrold Electronics Corp
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Filing: 1970-03-02
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Granted: 1972-07-25
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Expires: 1990-03-02
Abstract
Abstract A high frequency antenna system comprises an antenna, a transmission line such as a coaxial cable electrically connected to the antenna, and a magnetic member surrounding the outer conductor of the coaxial cable. The magnetic member suppresses extraneous currents that are induced in the outer conductor of the coaxial cable by radiations from the antenna. By suppressing the extraneous current in the outer conductor distortion of radiations is prevented. In the preferred embodiment, the magnetic member comprises a plurality of ferrite toroids which collectively form a cylindrical covering on the conductor. Several antenna systems of this type may be closely spaced in a compact array, and each system may operate independently of the others in the array without interference between antennas.
Inventors
- 👤 Robert T Leitner
- 👤 John E Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:38
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/52; H01Q1/528
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
153 words
A high frequency antenna assembly comprising at least first and second coaxially arranged cylindrical antenna elements for independently transmitting electromagnetic waves at respectively different first and second frequencies, means for supporting said first and second antenna elements at axially and relatively closely spaced positions relative to one another, first and second coaxial transmission lines arranged coaxially with said first and second antenna elements and having a center conductor coupled respectively to said first and second antenna elements for respectively supplying energizing current to said first and second antenna elements, at least one of said first and second transmission lines passing through one of said first and second antenna elements to which it is not coupled, and first and second magnetic members each incLuding a plurality of coaxially arranged ferrite toroids surrounding the outer shield of said one of said first and second transmission lines in the space between said first and second elements.
Claim 2
Dependent Claim
153 words
A high frequency antenna assembly comprising at least first and second coaxially arranged cylindrical antenna elements for independently transmitting electromagnetic waves at respectively different first and second frequencies, means for supporting said first and second antenna elements at axially and relatively closely spaced positions relative to one another, first and second coaxial transmission lines arranged coaxially with said first and second antenna elements and having a center conductor coupled respectively to said first and second antenna elements for respectively supplying energizing current to said first and second antenna elements, at least one of said first and second transmission lines passing through one of said first and second antenna elements to which it is not coupled, and first and second magnetic members each incLuding a plurality of coaxially arranged ferrite toroids surrounding the outer shield of said one of said first and second transmission lines in the space between said first and second elements.
Claim 3
Dependent Claim
46 words
The assembly of claim 1, in which at least a first one of said antenna means is adapted to transmit electromagnetic waves in the UHF range and at least a second one of said antenna means is adapted to transmit electromagnetic waves in the VHF range.
References Cited (Backward Citations)
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US3274520A
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US3293646A
Cited
US3411111A
Cited
US3447159A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |