US3797019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low loss modulation system for use with antenna array
Assignee: RANTEC MICROWAVE & ELECTRONICS Inc
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Filing: 1972-10-18
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Granted: 1974-03-12
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Expires: 1992-10-18
Abstract
Abstract An antenna array has paired radiating elements which are modulated in phase opposition. Such modulation is accomplished by means of semiconductor modulator elements, one of such elements being connected to the feed line for each of the paired antenna elements. Modulation signals are fed to the paired semiconductor elements in phase opposition relationship to vary the effective impedance of such elements accordingly, thereby causing the power fed to one of the associated paired antenna elements to increase while that to the associated paired element is decreasing, this in accordance with the modulation signal, the sum of the power radiated by the paired elements remaining constant. Power losses are thereby minimized.
Inventors
- 👤 L Shestag
- 👤 D Kreinheder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:29
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/44; G01S1/46; G01S1/48; H; H01; H01Q; H01Q3/00; H01Q3/26; H03; H03C; H03C7/00; H03C7/02; H03C7/025; H03C7/027
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
162 words
In a modulation system for providing radio frequency energy to a pair of radiating elements, the power of which varies in phase opposition relationship in accordance with a predetermined periodic function comprising: means for generating radio frequency energy, power splitter means for dividing said energy into two portions, a pair of power lines connected to receive the output of said power splitter means, each of said lines receiving one of said divided portions, means for modulating the radio frequency energy on each of said power lines with a separate signal in accordance with said periodic function, the modulating signal fed to one of said lines being in phase opposition relationship to that fed to the other of said lines, and means for feeding the modulated signal from each of said power lines to a separate one of said antenna elements whereby varying power signals are fed to said antenna elements, said power signals being in phase opposition and having a constant sum.
Claim 2
Dependent Claim
162 words
In a modulation system for providing radio frequency energy to a pair of radiating elements, the power of which varies in phase opposition relationship in accordance with a predetermined periodic function comprising: means for generating radio frequency energy, power splitter means for dividing said energy into two portions, a pair of power lines connected to receive the output of said power splitter means, each of said lines receiving one of said divided portions, means for modulating the radio frequency energy on each of said power lines with a separate signal in accordance with said periodic function, the modulating signal fed to one of said lines being in phase opposition relationship to that fed to the other of said lines, and means for feeding the modulated signal from each of said power lines to a separate one of said antenna elements whereby varying power signals are fed to said antenna elements, said power signals being in phase opposition and having a constant sum.
Claim 3
Dependent Claim
26 words
The system of claim 1 wherein said periodic function is a sine wave and the power is divided by said power splitter into substantially equal portions.
Claim 4
Dependent Claim
49 words
The system of claim 1 wherein said means for modulating the energy on said lines comprises a semi-conductor modulator element connected to each of said lines and means for providing signals to said elements to vary the effective impedances thereof in inverse relationship in accordance with said periodic function.
Claim 5
Dependent Claim
20 words
The system of claim 3 wherein said modulator elements comprise a diode connected in shunt with each of said lines.
Claim 6
Dependent Claim
20 words
The device of claim 3 wherein said modulator elements comprise a diode connected in series with each of said lines.
Claim 7
Dependent Claim
50 words
The device of claim 1 wherein said power splitter means comprises a strip line T power splitter having a pair of legs, each of said legs carrying half of the divided power, said power lines each impedance matching one of said legs to a separate one of said modulating means.
Claim 8
Dependent Claim
41 words
The device of claim 6 wherein said modulating means comprises a pair of diodes, each of said diodes being connected to a separate one of said power lines, and means for providing a separate modulation signal to each of said diodes.
Claim 9
Dependent Claim
15 words
The device of claim 7 wherein said diodes are connected in shunt with said lines.
Claim 10
Dependent Claim
15 words
The device of claim 7 wherein said diodes are connected in series with said lines.
Claim 11
Dependent Claim
140 words
A modulator for modulating the power fed from a radio frequency source to a pair of radiating elements in accordance with a periodic function comprising: means for dividing the power from said source into substantially equal portions, means for coupling the divided power portions to separate lines, means for modulating the power on each of said lines in accordance with said periodic function, the power on one of said lines being modulated in inverse relationship to that on the other of said lines, and means for feeding the modulated power on each of said lines to a separate one of said pair of radiating elements, whereby the power fed to one of said radiating elements varies inversely to that fed to the other of said radiating elements, the sum of the power fed to both of said elements remaining constant.
Claim 12
Dependent Claim
140 words
A modulator for modulating the power fed from a radio frequency source to a pair of radiating elements in accordance with a periodic function comprising: means for dividing the power from said source into substantially equal portions, means for coupling the divided power portions to separate lines, means for modulating the power on each of said lines in accordance with said periodic function, the power on one of said lines being modulated in inverse relationship to that on the other of said lines, and means for feeding the modulated power on each of said lines to a separate one of said pair of radiating elements, whereby the power fed to one of said radiating elements varies inversely to that fed to the other of said radiating elements, the sum of the power fed to both of said elements remaining constant.
Claim 13
Dependent Claim
22 words
The modulator of claim 10 wherein said modulating means comprises a separate semi-conductor element connected in shunt with each of said lines.
Claim 14
Dependent Claim
22 words
The modulator of claim 10 wherein said modulating means comprises a separate semi-conductor element connected in series with each of said lines.
Claim 15
Dependent Claim
165 words
In combination, a source of radio freQuency power, a modulation signal source, modulator means having a single input terminal for receiving the output of said source and a pair of output terminals, said modulator means coupling a portion of the power at said input terminal to one of said output terminals and the remaining power at said input terminal to the other of said output terminals, said modulator means further including means responsive to the output of said modulation signal source for modulating the power fed to said output terminals in accordance with a periodic function, the power fed to one of said output terminals being in inverse relationship to the power fed to the other of said output terminals, whereby the power at said input terminal is equal to the sum of the powers at said output terminals and is substantially independent of the variations thereof, and a pair of radiator elements, each of said elements receiving power from one of said output terminals.
Claim 16
Dependent Claim
165 words
In combination, a source of radio freQuency power, a modulation signal source, modulator means having a single input terminal for receiving the output of said source and a pair of output terminals, said modulator means coupling a portion of the power at said input terminal to one of said output terminals and the remaining power at said input terminal to the other of said output terminals, said modulator means further including means responsive to the output of said modulation signal source for modulating the power fed to said output terminals in accordance with a periodic function, the power fed to one of said output terminals being in inverse relationship to the power fed to the other of said output terminals, whereby the power at said input terminal is equal to the sum of the powers at said output terminals and is substantially independent of the variations thereof, and a pair of radiator elements, each of said elements receiving power from one of said output terminals.
Claim 17
Dependent Claim
22 words
The combination of claim 13 wherein said modulator means comprises a semiconductor device connected in shunt with each of said output terminals.
Claim 18
Dependent Claim
26 words
The combination of claim 13 wherein said modulator means comprises a semiconductor device connected in series between each of said output terminals and said input terminal.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |