US3566235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual frequency means for transmitting radio waves from a damaged aircraft
Assignee: Garrett Corp
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Filing: 1968-10-28
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Granted: 1971-02-23
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Expires: 1988-10-28
Abstract
Abstract In combination, a radio transmitter mounted on an aircraft wherein the antenna has the features of a center-fed balanced dipole antenna but is capable of operating effectively when one half thereof is broken off. The dipolelike antenna comprises two inline elements protruding from the vertical stabilizer of the aircraft in which position the probability of both elements breaking off during a crash landing is minimized. Circuit means are provided for feeding a radio frequency signal to each element of the novel antenna so that both signals have the same frequency and have their currents 180* out of phase.
Inventors
- 👤 Gary W Rose
- 👤 Rollin A Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:41
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/282; H01Q1/283; G; G01; G01S; G01S1/00; G01S1/02; G01S1/68
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
219 words
In combination, a vehicle, a radio transmitter for simultaneously supplying two high frequency signals having different frequencies and being carried by said vehicle, and antenna means mounted on said vehicle; said antenna means comprising a pair of rod elements disposed substantially colinearly and spaced from each other; a grounded plane disposed between the adjacent ends of said rod elements, circuit means coupled between said radio transmitter and said antenna means for shifting said two high frequency signals 180* out of phase with each other and for coupling said shifted signals to a respective rod element so that current flows in both of said rod elements in the same direction; said circuit means including first and second phase shift networks operably coupled to said radio transmitter and to one of said rod elements and responsive to said signals, said first network adapted to shift the phase of one of said signals and said second network adapted to shift the phase of the other of said signals; and third and fourth phase shift networks operably coupled to said radio transmitter and to the other of said rod elements and responsive to said signals, said third network adapted to shift the phase of one of said signals and said fourth network adapted to shift the phase of the other of said signals.
Claim 2
Dependent Claim
219 words
In combination, a vehicle, a radio transmitter for simultaneously supplying two high frequency signals having different frequencies and being carried by said vehicle, and antenna means mounted on said vehicle; said antenna means comprising a pair of rod elements disposed substantially colinearly and spaced from each other; a grounded plane disposed between the adjacent ends of said rod elements, circuit means coupled between said radio transmitter and said antenna means for shifting said two high frequency signals 180* out of phase with each other and for coupling said shifted signals to a respective rod element so that current flows in both of said rod elements in the same direction; said circuit means including first and second phase shift networks operably coupled to said radio transmitter and to one of said rod elements and responsive to said signals, said first network adapted to shift the phase of one of said signals and said second network adapted to shift the phase of the other of said signals; and third and fourth phase shift networks operably coupled to said radio transmitter and to the other of said rod elements and responsive to said signals, said third network adapted to shift the phase of one of said signals and said fourth network adapted to shift the phase of the other of said signals.
Claim 3
Dependent Claim
28 words
In the combination of claim 1 wherein; said vehicle is an aircraft having a vertical stabilizer, the rod elements are mounted on opposite sides of said vertical stabilizer.
Claim 4
Dependent Claim
50 words
In the combination of claim 1, wherein said first phase shift network includes a parallelly connected capacitor-inductance circuit operably coupled to said radio transmitter, and said second phase shift network includes a serially connected capacitor-inductance circuit operably coupled to said first phase shift network and to a respective rod element.
Claim 5
Dependent Claim
50 words
In the combination of claim 1, wherein said third phase shift network includes a serially connected capacitor-inductance circuit operably coupled to said radio transmitter, and said fourth phase shift network includes a parallelly connected capacitor-inductance circuit operably coupled to said third phase shift network and to a respective rod element.
Claim 6
Dependent Claim
72 words
In the combination of claim 1, wherein said circuit means additionally includes an input terminal connected to said radio transmitter to receive both of said signals from said radio transmitter, and first and second leads connected to said input terminal for conducting said signals to said phase shift networks, said first lead operably connected to said first phase shift network and said second lead operably connected to said third phase shift network.
Claim 7
Dependent Claim
122 words
In the combination of claim 1, wherein said circuit means additionally includes a first signal conducting means connected to said first and second phase shift networks for conducting said signals from said first and second phase shift networks, a second signal conducting means connected to said third and fourth phase shift networks for conducting signals from said third and foUrth phase shift networks, a first impedance matching means operably coupled to said first signal conducting means and to a respective rod element for matching the complex impedance of said respective rod element, and a second impedance matching means operably coupled to said second signal conducting means and to a respective rod element for matching the complex impedance of said respective rod element.
Claim 8
Dependent Claim
17 words
In the combination of claim 6, wherein said first and second signal conducting means are coaxial cables.
Claim 9
Dependent Claim
39 words
In the combination of claim 6, wherein said first and second impedance matching means each includes an inductance operably connected with a parallelly connected capacitor-inductance network each operably coupled between a respective signal conducting means and a rod element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |