Patent FR618580A successfully refreshed from Google Patents.
Patent US3656167A successfully refreshed from Google Patents.
US3656167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dipole radio antennae
Assignee: Plessey Overseas Ltd
•
Filing: 1969-11-25
•
Granted: 1972-04-11
•
Expires: 1989-11-25
Abstract
Abstract Dipole whip antenna arrangements are disclosed which are capable of operating over a wide frequency band without the use of continual manual or automatic tuning. This is achieved by connecting the dipole whip antenna to the ground plane through a reactance network which is specially designed so as to match the impedance at the feed point of the dipole arrangement to a desired value over the desired frequency band. For this purpose, the reactance network is an active network, and operates by effectively cancelling out the reactance of the antenna.
Inventors
- 👤 Charles A Lea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:43
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/383; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A dipole antenna arrangement, comprising a dipole antenna having two antenna elements and a feedpoint, a reactance network comprising a wide-band amplifier constituting an active impedance-converting device, a series resonant circuit, and means connecting the series resonant circuit to provide a negative feed-back path across the amplifier, and means connecting the reactance network in circuit with one element of the dipole, the gain of the amplifier and the impedance of the resonant circuit being so chosen that the effective overall input impedance of the amplifier varies with frequency to give the network a reactance/frequency characteristic such as to match the impedance at the feedpoint of the dipole to a desired value over a wide frequency range.
Claim 2
Dependent Claim
116 words
A dipole antenna arrangement, comprising a dipole antenna having two antenna elements and a feedpoint, a reactance network comprising a wide-band amplifier constituting an active impedance-converting device, a series resonant circuit, and means connecting the series resonant circuit to provide a negative feed-back path across the amplifier, and means connecting the reactance network in circuit with one element of the dipole, the gain of the amplifier and the impedance of the resonant circuit being so chosen that the effective overall input impedance of the amplifier varies with frequency to give the network a reactance/frequency characteristic such as to match the impedance at the feedpoint of the dipole to a desired value over a wide frequency range.
Claim 3
Dependent Claim
124 words
An antenna arrangement according to claim 1, comprising a further dipole antenna having two antenna elements and a feedpoint, a further reactance network comprising a wide-band amplifier constituting an active impedance-converting device, a series resonant circuit, and means connecting the series resonant circuit to provide a negative feedback path across the amplifier, means connecting the further reactance network in series with one element of the further dipole, the gain of the amplifier and the impedance of the resonant circuit being so chosen that the effective overall input impedance of the amplifier varies with frequency to give the further network a reactance/frequency characteristic such as to match the impedance at the feedpoint of the further dipole to a desired value over a wide frequency range.
References Cited (Backward Citations)
US1314095A
Cited
US2283617A
Cited
US2283619A
Cited
US2283618A
Cited
US2485457A
Cited
US2505511A
Cited
US2745067A
Cited
US2913722A
Cited
US3160832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |