US3717876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite antenna coupled to radio frequency currents in vehicle body
Assignee: VOLKERS RES CORP
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Filing: 1971-04-23
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Granted: 1973-02-20
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Expires: 1991-04-23
Abstract
Abstract An antenna system in which a Faraday cage acts as the primary antenna which intercepts the electromagnetic waves and reradiates them to a secondary antenna located within the Faraday cage.
Inventors
- 👤 E Willie
- 👤 W Volkers
- 👤 D Volkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:01
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3283; H01Q1/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
An antenna system comprising a passive primary antenna for intercepting and reradiating electromagnetic energy, said primary antenna comprising an electrically conductive vehicle body having a roof portion and a body portion and at least one electrically conductive member connecting said roof portion to said body portion, said vehicle body being of a size which disturbs the field patterns of an incident electromagnetic radiation so as to cause equalizing currents to flow within said Electrically conductive member; and a ferrite antenna for connection with a transmitter or receiver, said ferrite antenna being disposed in close proximity to said electrically conductive member, and having its axis skewed at substantially right angles to said electrically conductive member so as to couple at least a portion of the magnetic flux induced by said equalizing currents flowing in said electrically conductive member.
Claim 2
Dependent Claim
137 words
An antenna system comprising a passive primary antenna for intercepting and reradiating electromagnetic energy, said primary antenna comprising an electrically conductive vehicle body having a roof portion and a body portion and at least one electrically conductive member connecting said roof portion to said body portion, said vehicle body being of a size which disturbs the field patterns of an incident electromagnetic radiation so as to cause equalizing currents to flow within said Electrically conductive member; and a ferrite antenna for connection with a transmitter or receiver, said ferrite antenna being disposed in close proximity to said electrically conductive member, and having its axis skewed at substantially right angles to said electrically conductive member so as to couple at least a portion of the magnetic flux induced by said equalizing currents flowing in said electrically conductive member.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |