US3594805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite rod antenna with longitudinally split sleeve
Assignee: Pye Electronic Products Ltd
•
Filing: 1969-03-14
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Granted: 1971-07-20
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Expires: 1989-03-14
Abstract
Abstract This invention relates to aerials comprising a ferrite rod disposed within a longitudinally split sleeve of electrically conducting material and where a substantially uniform capacitance exists or is provided across the split. According to this invention the resonant frequency of the aerial can be adjusted by varying the inductance of the split sleeve disposed around the ferrite rod.
Inventors
- 👤 Eric G Chardin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:52
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q7/06; H01Q7/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A magnetic dipole aerial comprising a ferrite rod, a split sleeve of electrically conducting material disposed around said ferrite rod, an aperture in said sleeve and a member of electrically conducting material movable to cover or uncover said aperture, thereby to vary the inductance of said split sleeve to adjust the resonant frequency of the aerial.
Claim 2
Dependent Claim
56 words
A magnetic dipole aerial comprising a ferrite rod, a split sleeve of electrically conducting material disposed around said ferrite rod, an aperture in said sleeve and a member of electrically conducting material movable to cover or uncover said aperture, thereby to vary the inductance of said split sleeve to adjust the resonant frequency of the aerial.
Claim 3
Dependent Claim
56 words
A magnetic dipole aerial comprising a ferrite rod, a longitudinally split sleeve of electrically conducting material disposed around said rod over part of its length, an aperture in said sleeve, and a member of electrically conducting material in contact with the external surface of said sleeve and movable so as to cover or uncover said aperture.
Claim 4
Dependent Claim
56 words
A magnetic dipole aerial comprising a ferrite rod, a longitudinally split sleeve of electrically conducting material disposed around said rod over part of its length, an aperture in said sleeve, and a member of electrically conducting material in contact with the external surface of said sleeve and movable so as to cover or uncover said aperture.
Claim 5
Dependent Claim
23 words
An aerial as claimed in claim 2, wherein the aperture is a slot extending longitudinally of the sleeve over part of its length.
Claim 6
Dependent Claim
44 words
An aerial as claim in claim 2, wherein the member is a further sleeve which is axially slidable on the external surface of the split sleeve between a position in which it covers the aperture and a position in which it uncovers the aperture.
Claim 7
Dependent Claim
37 words
An aerial as claimed in claim 2, wherein substantially uniformly distributed capacitance is provided across the split in the sleeve by connecting capacitor means of effectively equal capacity across the split at spaced points along the sleeve.
Claim 8
Dependent Claim
71 words
An aerial as claimed in claim 5, wherein the coupling to the aerial is effected in a capacitive manner by forming one of the capacitor means connected across the split in the sleeve from at least two serially connected capacitors whose effective capacity is equal to that of the other capacitor means connected across the split and means connecting the leads to the aerial across one of the serially connected capacitors.
Claim 9
Dependent Claim
23 words
An aerial as claimed in claim 2, wherein the split sleeve and the member of electrically conducting material are made of beryllium copper.
References Cited (Backward Citations)
US3267478A
Cited
US3453634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |